With ‘great promise’ for treating Huntington’s disease, four drug programs press ahead (Part II)

 

At the recent 20th Huntington’s Disease Therapeutics Conference in February, four pharmaceutical companies provided updates on their key clinical trial programs, demonstrating that they had overcome basic safety hurdles and revealing plans to have their drugs potentially approved as therapies (treatments) for delaying the progression of HD symptoms.

 

All four programs use drugs to lower the amount of harmful mutant huntingtin protein in the brain cells of patients.

 

In the first of two articles on these programs, I described the projects of PTC Therapeutics and Roche.

 

In this article, I cover the presentations made by Wave Life Sciences and uniQure.

 

These updates took place during the conference’s first session on February 25, the first day of the three-day event.

 

In a post-conference interview Robert Pacifici, Ph.D., the chief scientific officer for CHDI Foundation, Inc., the conference sponsor, told me that that there is “great promise” regarding these four programs’ potential HD therapies.

 

Attacking only the bad protein, preserving the good one

 

Jane Atkins, Ph.D., Wave’s senior vice president for portfolio strategy and program management, provided an update on the company’s groundbreaking program.

 

Like Roche’s tominersen, Wave’s WVE-003 is an antisense oligonucleotide, an artificial strand of DNA that blocks or lowers the production of the huntingtin protein.

 

However, whereas tominersen and PTC’s votoplam (a splicing modulator) reduce both the mutant and normal huntingtin protein, Wave’s drug is uniquely allele-selective: it attacks just the bad protein and allows the good one to carry out its essential actions unhampered.

 

Clinical trials for drugs usually go through three phases. If the last is successful, the drug can receive approval from the U.S. Food and Drug Administration (FDA).

 

In 2021, in small clinical trials, precursors WVE-120101 and WVE-120102 failed to reduce the bad protein. Wave then developed WVE-003, which entered a clinical trial that same year.

 

At the conference, Dr. Atkins reported that in June 2024 the Phase 1b/2a SELECT-HD study of WVE-003 produced positive results, “including the first allele-selective silencing in any disease.”

 

“A growing body of literature” supports the importance of the good huntingtin protein, she explained, as it sustains the health of brain cells.

 

Slowing the shrinking of the brain

 

In the clinical trial, the bad protein was reduced as much as 46 percent in some volunteers, exceeding the overall goal of 30 percent, Dr. Atkins said, noting that the drug was safe and well-tolerated.

 

Significantly, the study also demonstrated a slowing in the atrophy (shrinking) of the caudate, a key part of the brain dramatically affected in HD, leading to a decline in cognition, function, and movement, Dr. Atkins said. Such atrophy occurs before symptoms appear, she noted, so being able to observe this change early makes the atrophy a good measure of a drug’s effectiveness.

 

The slower shrinking “was the first time this was shown in the clinic,” Dr. Atkins said. “We were super-excited to see this.”

 

With these promising results, Wave plans to put WVE-003 into a combined Phase 2/3 clinical trial, Dr. Atkins said. The company later this year expects to seek FDA approval of the trial. Wave proposes to use caudate atrophy as a primary endpoint, that is, a main measure of WVE-003’s effectiveness.

 

Wave is also investigating WVE-003’s potential impact on somatic expansion, Dr. Atkins said. Somatic expansion is the tendency of the mutant huntingtin gene to continue expanding over time. Many scientists now believe that this process triggers HD symptoms.

 

Somatic expansion is understood as a two-step process where expansion of the gene (step 1) triggers disease (step 2) that drives HD. Wave believes that lowering the bad protein selectively (with WVE-003) is likely to address the second step.

 

As with tominersen, WVE-003 is administered via a spinal tap. Votoplam is a pill.

 

 

Dr. Jane Atkins of Wave Life Sciences displays a slide demonstrating the slowing of caudate atrophy in the WVE-003 clinical trial (photo by Gene Veritas, aka Kenneth P. Serbin).

 

uniQure drug slows disease progression in trial

 

David Margolin, M.D., Ph.D., uniQure’s vice president for clinical development, gave a presentation on the latest developments regarding AMT-130, the firm’s gene therapy drug that reduces the levels of both the good and bad huntingtin protein.

 

In the uniQure clinical trial, a neurosurgeon injects AMT-130 directly into the brains of the volunteers under the guidance of an MRI. As a gene therapy, AMT-130 requires just this one application. (Watch the uniQure video about how AMT-130 is administered here).

 

This small, long-term uniQure Phase 1/2 trial began in 2020. As of April, the number of participants had reached 45, including people from the U.S. and Europe.

 

An interim analysis in mid-2024 showed that “AMT-130 high dose … strongly and significantly reduced disease progression,” Dr. Margolin pointed out. Another analysis found “substantial reduction in risk of clinically meaningful worsening,” he added.

 

As patients continue to go through the trial and beyond, with follow-up, “with every data cut we see… a promising treatment effect becoming more and more evident,” Dr. Margolin said.

 

 

Dr. David Margolin of uniQure presents data illustrating the slowing of HD disease progression in the AMT-130 clinical trial (photo by Gene Veritas).

 

Hoping to accelerate approval

 

The positive results have led uniQure to seek acceleration of FDA approval for AMT-130.

 

Because of HD’s status as a rare disease, in 2017 uniQure received the financially beneficial orphan drug designation from the FDA for AMT-130. In 2019, FDA granted AMT-130 fast track status to further facilitate development of the drug and expedite review.

 

As explained by Dr. Margolin at the conference, in 2024 the FDA defined AMT-130 as a regenerative medicine advanced therapy (RMAT).

 

This category includes life-threatening diseases such as HD. Dr. Margolin said it is applicable to new kinds of drugs such as gene therapy, cell therapy, and tissue-engineered products, and it further accelerates FDA review.

 

In achieving this designation, uniQure presented to the FDA the data from the Phase 1/2 trial, and the FDA agreed that this data can serve as the primary basis for a drug application, Dr. Margolin said.

 

Dr. Margolin indicated that this determination means that uniQure will not need to put AMT-130 into a Phase 3 trial.

 

“An additional investigational study will not be required,” he emphasized. “That accelerates by several years the timeframe in which AMT-130 might become available to a wider U.S. cohort of patients.”

 

Swaying the FDA to be more flexible

 

Because of the lack of therapies that modify the course of this rare and devastating disease, the uniQure project and the company’s dialogue with the FDA have indicated the willingness of the agency to allow flexibility in clinical trial programs and a faster timeline.

 

Dr. Margolin’s talk title included the phrase “alignment on a US Regulatory Path Via RMAT.” Alignment with the FDA could lead to an “accelerated approval” for AMT-130, he observed.

 

Dr. Margolin asserted that uniQure’s dialogue with the FDA “has meaningfully advanced HD regulatory science.”

 

In response to a question from Dr. Pacifici about the negotiations with the FDA, Dr. Margolin stated that uniQure hopes that the lack of disease-modifying therapy is “swaying FDA to be more liberal than they have been in the past.”

 

Dr. Pacifici asked what additional studies uniQure will conduct if it secures the accelerated approval, which would still be only conditional.

 

Dr. Margolin replied that uniQure will discuss that matter with the FDA.“Importantly, even an accelerated approval means the drug will be available to patients,” Dr. Margolin stressed. “It does constrain promotional materials in certain ways, but would have no relevant impact on its potential availability and accessibility to U.S. patients.”

 

A Breakthrough Therapy designation

 

AMT-130 gained RMAT designation because it is a gene therapy. Since the conference, the AMT-130 program has made yet further progress.

 

On April 17, uniQure announced that the FDA granted Breakthrough Therapy designation to AMT-130.

 

“Receiving Breakthrough Therapy designation underscores both the urgent need for effective treatments for Huntington’s disease and the encouraging interim data demonstrating that AMT-130 has the potential to slow disease progression,” said Walid Abi-Saab, M.D., chief medical officer of uniQure, in a press release. “We look forward to working closely with the agency to bring AMT-130 to the Huntington’s disease patient community as quickly as possible.”

 

As explained in the press release, Breakthrough Therapy designation for AMT-130 means that the drug “may demonstrate substantial improvement over available therapy on a clinically significant endpoint(s).” 

 

The firm expects to provide a further FDA update this quarter. In the third quarter, it aims to present data on AMT-130 to support its potential drug application submission.

‘No Marine deserted on the battlefield’: two surviving spouses join forces to speed the defeat of Huntington’s disease

After the deadly, untreatable Huntington’s disease claimed their spouses, Jonathan Monkemeyer and Jane Mervar – once strangers, now close – decided to devote their lives to finding ways to speed the search for effective remedies and making the case for the importance of juvenile HD (JHD) in the process.

Without at first knowing the cause of his wife Sheryl’s strange illness, Jonathan quit his job in the early 2000s to become her full-time caregiver until she died from HD in 2009 at 46.

“It’s the thing you have to do,” Jonathan, an accomplished electrical engineer, said in a recent phone interview from his home in suburban Philadelphia. “You really don’t have a choice in our country. We did a lot of nice things, which was good. We did peaceful things like traveling to local gardens. She spent a lot of time with our son.”

Sheryl died at home. “I didn’t expect her to die,” Jonathan said. “I thought we would get the cure in time. The doctor said she had five years. But she fell and got hurt. She couldn’t sit. I had to hold her. Her weight went from 109 pounds to 89 pounds within four weeks. She died of a heart attack, which is like starving to death.”

Caring for Sheryl depleted the family’s life savings, Jonathan added. “I’m heating with wood right now,” he said. “I’m not using heating oil.”

The couple’s son Jonathan, now 14, has a 50-50 chance of having inherited the HD gene from his mother. (Usually only adults can decide whether to be tested for the gene, and most choose not to do so. Children can be tested if they already show symptoms.)

A parallel story

Halfway across the country in the village of L’Anse in the Upper Peninsula of Michigan, Jane faced her own difficult odyssey to decipher the disease afflicting her family. She lost not only her 49-year-old husband Karl, but also her 13-year-old daughter Karli Mukka to HD, both in early 2010. (Jane gave her daughters her maiden name.)

“Karl was a wonderful, ambitious, intelligent man,” Jane said at the start of an exhausting and emotional four-hour interview. “He had very strong family values. He could always make me laugh.”

However, she recounted, gradually “he started to change. Nobody could explain to me what was going on.”

Karl Mervar and daughter Karli Mukka, both victims of HD (family photo)

Like many HD patients, Karl became angry and aggressive, threatening his family with violence.

“Karl held us hostage with his guns,” Jane said, recalling the dangers she, Karli, and her three other daughters faced as Karl’s behavior became increasingly irrational. “There were a lot of scary, scary times. We had a safe room in the house. We’d go in the room and push the bed up against the door. The girls knew this routine. Then I would try to play with him or try to distract him.

“The darn thing is, I knew we were everything left in the world that meant anything to him.”

JHD ravaged Karli’s body, displacing the organs in her chest cavity and forcing her spine to the far side. Because of the disease’s uncontrollable movements, Karli had chewed off half of her tongue by the time she died, Jane said.

A nurse suggested that Jane give Karli morphine and “let her go.” She declined the advice.

“It was a hard spot to be in,” Jane said. “I talked to Karli and asked her if she was ready to go on baby Jesus’s lap. She said no. She died of natural causes.”

Today Jane just gets by financially, thanks to Social Security benefits, as she cares full-time for her two other daughters with Karl, 22-year-old Erica Mukka and 20-year-old Jacey Mukka. Like Karli, both have JHD. Karisa Mukka, a 26-year-old daughter from a previous relationship, lives nearby.

Partners in love and advocacy

In June 2010, still in mourning for their lost loved ones, Facebook friends Jonathan and Jane struck up a lively conversation while sitting next to each other at the 25^th convention of the Huntington’s Disease Society of America (HDSA) in Raleigh, NC. After the convention, they spoke daily for at least a couple of hours. Jonathan visited L’Anse, and shortly thereafter Jane and Jacey stayed nine days with the Monkemeyers.

Their friendship led Jonathan and Jane into a romantic, long-distance relationship.

“They’re an incredible family,” Jonathan said of Jane and her daughters. “Their value system is not about themselves.”

“I was in a pretty low place,” Jane recalled. “I had lots of grief after Karli and Karl died. I wanted a reprieve from caregiving – just wanted to be dead. I’d be laughing after I finished talking to Jonathan. I think he saved me.”

Their relationship and support for each other’s families also became a partnership in advocacy for HD patients.

Bridging the gaps

To achieve their goals, Jonathan and Jane are politely but firmly challenging bureaucratic inertia.

Supporting himself and his son with his son’s Social Security survivor benefits, Jonathan dedicates himself full-time to HD advocacy. He has developed a deep understanding of HD science. By his account, he has so far skimmed through more than 10,000 scientific articles related to the disease.

Applying an engineering approach to the problem of developing treatments, Jonathan developed a website, HDCircle.org, currently offline, on which he has posted information about HD researchers from around the world, links to HD organizations, and reviews of potential HD treatments. He plans to reactivate the site soon.

He also created a Facebook discussion page, Hereditary Disease Circle, with the goal of finding connections between HD and other neurological conditions such as Parkinson’s disease, multiple sclerosis, posttraumatic stress disorder, and amyotrophic lateral sclerosis, also known as Lou Gehrig’s disease.

In addition, he attends relevant meetings and conferences in order to network with people from other disease communities. He seeks to bring their best results and ideas to bear on HD research.

As Jonathan explained, he aims to create “synergies” and “bridge the gaps” among HD researchers and the various key organizations such as HDSA, the Hereditary Disease Foundation (HDF), the CHDI FoundationInc., the multi-million-dollar, non-profit virtual biotech formed solely to seek HD treatments, and the National Institutes of Health (NIH).

As one example, Jonathan said he has spoken personally with NIH Director Dr. Francis Collins, one of the pioneers in the search for the HD gene in the 1980s and 1990s, more than a dozen times, including last week in Washington, D.C.

NIH Director Francis Collins (left) and Jonathan Monkemeyer (personal photo)

“Essentially, engineers design things hierarchically,” Jonathan explained. “I created a website, which is a blueprint for how the system works.

“We’re the only disease without a gene therapy. There have been 1,000 gene therapy clinical trials. But we as a community don’t seem to be organized enough. There’s something in our organizational structure. By their very nature of having a job description, when you’re within an organization, your function is to be in the organization. Everybody gets stuck in a silo of what they’re doing. With so many scientists and stakeholders in the field of HD research, moving forward gets stymied by committee and the sense of urgency gets tuned out.”

If he held a position within one of the organizations, “I’d have a boss to report to,” Jonathan continued. “As an outsider, without a job, and asking questions as an advocate, it gives you the position to help steer people in the right direction towards what needs to be done. I have the greatest freedom, not being employed in an organization. I can talk to anybody I want to.”

Sometimes Jonathan feels as if he’s “walking on egg shells, because I’m not a researcher,” he said. “You tell people very nicely and very artfully. We don’t tear down institutions. We build them up.”

He summed up his approach as “doing what needs to be done to drive innovation that will bring a therapeutic to our community.”

What might work

Significantly, Jonathan’s efforts include canvassing the research community for the latest discoveries and techniques that could translate into therapies for HD. He seeks to brainstorm about new developments, as well as previous ones, in his conversations with scientists.

Rather than simply await for the multi-million-dollar pharmaceutical efforts to bring results, advocates must actively participate in the search for treatments, perhaps even trying drugs and substances approved for other purposes in their own off-label studies, seeking advice from researchers on dosing, and having people reporting their observations via a website, Jonathan suggested.

He cited the example of Hannah’s Hope Fund (HHF), whose advocates teamed with researchers in a low-cost effort to develop gene therapy for a rare genetic condition known as giant axonal neuropathy. HHF has met with the federal Food and Drug Administration (FDA) and, if a safety study goes as planned, could start a clinical trial this year.

In the drug-discovery system in America, the profit motive “stymies innovation and responsibility” towards the patients, Jonathan observed. Rather than producing strong leaders like a Jonas Salk, who developed the vaccine for polio, the system today fosters a climate of “let’s make everybody happy.”

Jonathan also pointed to the new partnership between the NIH and the Milken Institute/Faster Cures, which seeks to increase collaboration among the government, foundations, universities, and the pharmaceutical industry in order to cure more diseases and do it faster. This initiative includes the creation of a new NIH program, the National Center for AdvancingTranslational Sciences.

Advocates for rare diseases like HD need “to get involved in every single aspect” of the search for treatments.

“AIDS advocates made the FDA bend,” he noted. “We the patients have a moral incentive. Our voice counts and makes the difference.”

An epiphany about JHD

Like other JHD advocates, Jane and Jonathan have strived to increase the attention to JHD by researchers, HD organizations, and the government.

In September 2010, Jonathan and Jane met with Dr. Steve Groft, the director of the Office of Rare Diseases Research at the NIH, to press the case for greater support for HD research.

For Jonathan and Jane, the meeting was a kind of epiphany. Pointing to the different emphases and the existence of different organizations in the field of diabetes and juvenile diabetes, Groft helped them see the key role that JHD research could play in the overall HD effort.

Dr. Steve Groft and Jane Mervar. In the middle is Max the Turtle, Karli’s stuffed animal companion that is now a mascot of the JHDKids initiative (family photo).

“The meeting was phenomenal,” Jane said. Jonathan said she came away with a greater sense of “we need to do something.”

“Everybody was so resistant to acknowledge the juvenile population,” Jane said. “It’s just like some big political game. Nobody was playing that game for our children, so we were screaming: we need a cure, we need a cure, we need a cure!”

“You need a piece of legislation to get JHD funded, and then the NIH would fund it,” Jonathan explained, pointing to one of the roadblocks facing the efforts to understand and treat JHD.

Both Jonathan and Jane observed that JHD research lags far behind other HD research, and, because of ethical concerns and the need to avoid mixing juvenile and adult research data, children aren’t included in clinical trials.

Jane tried but failed to sign up Karli for a trial for ACR-16, seen as a potentially promising HD remedy. Jane described the formal response she received as “too bad for you, you have Juvenile HD.” “I was devastated,” she said.

Karli also took the supplement creatine, currently under study for HD and taken by many in the community. “It took us almost a year to get two doctors to follow Karli when she was on creatine and to get a guideline on dosage,” Jane recalled. “There are a lot of families that are just slipping through the cracks.”

Researchers have also lacked a so-called “natural history study” of JHD – a study to follow a group of patients over an extended period to better understand the condition and support the development of treatments.

Jane and Jonathan’s advocacy has included pressing the HD organizations to pay greater attention to JHD, they said. Thanks to pressure from JHD families, last year HDSA agreed to the creation of a new fundraising effort specifically for JHD, Jane explained.

“Great things can be created from hard situations,” Jane observed.

Jonathan and Jane at the White House after their meeting at the NIH Office of Rare Diseases and Research (family photo)

Raising the profile of JHD

Jane, her daughters, and other JHD families swung into action, joining other grassroots JHD initiatives in the effort to raise awareness and funds for research.

Jacey and Erica started JHDKids.com. With a computer and video equipment provided by the Make-a-Wish Foundation, Jacey has made a series of short films, including one about Karl and Karli titled The Real Huntington’s Disease, which has had more than 220,000 views on YouTube. (Watch the video below.)

The JHDKids initiative is seeking funds specifically to support the JHD research of Dr. Jane Paulsen, the co-director of the HDSA Center of Excellence at the University of Iowa, and project partner Dr. Martha Nance, the director of the HDSA Center of Excellence in Minneapolis.

Both researchers work on a volunteer basis, with all funds raised going solely to research.

In the words of the JHDKids site, JHD differs significantly from adult onset HD in several ways. “The most significant difference is that in JHD the disease occurs before the brain is fully developed,” says a statement on the site from the researchers. “This accounts for the wide variation at one age from JHD to another age. Maturation and neurodegeneration occur at the same time in JHD.”

Drs. Paulsen and Nance began following JHD patients at the annual HDSA conventions in order to carry out the natural history study.

“Now, with the awareness and fundraising getting more widespread, they’re able to bring our families into Iowa,” Jane explained. “We’re planning on going this spring. That will be the first time we’re going to Iowa.”

One big family

Jonathan and Jane have talked of bringing their families together in one place.

For now, however, they will continue their hours-long daily conversations from their respective abodes. Jonathan’s location on the East Coast facilitates his access to the corridors of scientific and medical power, while Jane wants to respect Jacey’s wish to die in the same place as her sister and father.

The distance does not diminish their commitment to each other’s families, nor to the larger cause.

Jonathan helps Jane manage her caregiving crises. “He’s always learning something new,” she said. “He’s a very faithful, spiritual person. He’s just a very good man.”

Erica and Jacey’s doctors wouldn’t predict how long they might live, although JHD patients typically die in their 20s or 30s, if not sooner, like Karli.

Jane knows that an effective, life-saving treatment might not come in time to save them. She concentrates on providing them with the healthiest, happiest life possible. Having worked as a nurse’s aide in a nursing home and seen Karl go through his final decline in such a home, she hopes to keep her girls at home as long as possible.

“Jacey has a big phobia that if she can’t see me, she’ll die,” Jane said. “We can’t calm that down. She likes to watch movies. She likes to work on the website. She likes to see all the kids with JHD. She likes to come up with new ideas for designing the website.”

At 19, Erica had married her high school sweetheart, but the marriage lasted only 11 months. She is currently dating another man. “She wants him to learn how to do her makeup and coordinate her clothing,” said Jane, who has legal guardianship over both daughters.

She obtained a court order to obtain permission for a tubal ligation for Erica.

“I cried with her,” Jane said. “It was just a real painful process to go through. She said, ‘If I had a baby and got sicker, and what if my baby’s like Karli?’”

“Fear for my son is certainly a reason,” said Jonathan of his commitment to the HD cause, noting that, so far, his son has showed no HD symptoms. “That’s a personal, selfish motivation. Why is my son’s life more important than someone else’s life? I know Jacey and Erica and everybody else that’s dying from this.”

He added, “I’m doing this full time, and as far as I’m concerned, there’s nothing more important I can do with my life. It’s knowing everybody in the community and knowing the suffering and the damage it causes to families. You don’t leave a marine in the battlefield. It’s just wrong to walk away. I can’t stop doing it. This is my life experience.”

His experiences as Sheryl’s caregiver have deepened his feelings about others facing the same plight.

“When I see HD in somebody else, the empathy is much more intense and overwhelming,” he confided. “To me, we’re all a big family. That’s why I can’t walk away.”

California stem cell agency approves $19 million clinical trial project as Huntington’s disease families ‘change the course of science’

Adult stem cells designed to rescue brain cells from death in Huntington’s disease patients could enter human testing in the next three to four years, thanks to a $19 million grant to an HD research team at the University of California, Davis (UC Davis), from the California Institute for Regenerative Medicine (CIRM).

If successful, this first-ever stem cell clinical trial for Huntington’s could pave the way for a possible treatment of the devastating disorder.

At a public meeting July 26, the oversight board of the $3 billion stem cell agency announced the award to the lab of researcher Jan Nolta, Ph.D., a recognized specialist in mesenchymal (pronounced “meh-zen-KI-mal”) stem cells (MSC), and her collaborator Vicki Wheelock, M.D., a neurologist and the director of the Huntington’s Disease Society of America’s Center for Excellence for Family Services and Research at UC Davis.

Dr. Nolta aims to introduce MSCs, which act as natural “paramedics” in the body, into the brains of symptomatic HD patients to test for safety and tolerability. The trial doses will be made from a sample of MSCs extracted from a healthy donor.

MSCs produce a so-called “fertilizer for the brain” (BDNF, brain-derived neurotrophic factor), whose levels plummet drastically when someone has HD. Dr. Nolta and her team have engineered MSCs to produce higher levels of BDNF in an attempt to help HD-damaged neurons recover and avoid death, thus slowing, halting, or perhaps even reversing the course of HD.

Dr. Nolta’s collaborator Gary Dunbar, Ph.D., of Central Michigan University, has already demonstrated that these MSCs mostly stop symptoms in transgenic mice that have been given the abnormal HD gene.

Dr. Jan Nolta (above) at the HD work bench at the Institute for Regenerative Cures. Below, Dr. Vicki Wheelock (photos by Gene Veritas).

The Nolta-Wheelock grant was one of eight CIRM grants totaling $151 million to labs seeking treatments for debilitating or fatal diseases, including Lou Gehrig’s disease, cancer, heart disease, and spinal cord injuries. The awards were the second largest research round in CIRM history. In 2009 the agency granted more than $200 million to researchers.

With a score of 87/100, the Nolta-Wheelock grant ranked highest in the state.

“We’re just so glad that we didn’t let the community down,” Dr. Nolta told HD activist Melissa Biliardi on The HD View internet radio program on July 23 in anticipation of the expected award.

In this same round UC Davis received two other grants – to seek treatments for peripheral artery disease and osteoporosis – that Dr. Nolta will help oversee in her role as the director of the UC Davis stem cell program and the university’s Institute for Regenerative Cures (IRC), which has nearly 150 affiliated faculty researchers.

“People are hopeful, truly hopeful for the first time,” Judy Roberson, the former president of the Northern California Chapter of the Huntington’s Disease Society of America (HDSA) and the widow of an HD victim, said after the CIRM announcement. “This is a nightmarish, cruel disease in every way but now, thanks to CIRM, we are turning the dream of a stem cell therapy trial into a reality. Research means hope for people with this disease, but research costs money. CIRM has given us all hope.”

The trial’s proposed timeline

CIRM will grant the $19 million over four years, the proposed timeline of the clinical trial project. Most of the money will cover charges such as surgeries, operating room and hospital costs, MRI scans, and other items related to the actual trial.

According to the proposal, the UC Davis team will spend the first year testing the safety of MSCs in healthy non-human primates. This stage of the project will help the team secure the necessary approval for human testing from the U.S. Food and Drug Administration (FDA), which regulates clinical trials.

In the project’s second year the team hopes to enroll at least 26 early-stage HD patients in an observational study, including motor and psychiatric tests and MRI brain scans, to obtain basic measurements of their health for comparison with readings to be taken during the clinical trial.

At the start of the third year, if all regulatory approvals have been obtained as planned, the patients will receive a single, direct injection of the MSCs into each side of their brains (a bilateral intrastriatal injection). A special neurosurgical team, which will include experts from the University of California, San Francisco, will bore a tiny hole into the skull to insert a tiny cathether to deliver the cells. Direct insertion is necessary because of the blood/brain barrier, which allows few medications to enter the brain. Patients will have part of their heads shaved. However, their hair should grow back, and the holes will heal over.

Half of the patients will receive MSCs with the extra BDNF-producing capability, while the other half will receive a placebo, MSCs without that capability.

Trial participants will receive dosages in groups and on a staggered schedule, with each successive group receiving a higher amount of the MSCs.

The remainder of the trial will primarily check for the safety of the MSCs. As a secondary goal, the scientists and physicians will also look for alleviation of symptoms and evidence that the MSCs are improving the health of the brain.

This first step in the trial is known as Phase I. If the MSCs prove safe, the team would seek funding for Phases II and III to fully measure the cells’ efficacy.

All of these plans must receive formal approval from UC Davis’s internal review board and then the FDA, after which full details will become available for potential trial participants.

A brief history of stem cells

To understand Dr. Nolta’s work we must travel back in time to explore the roots of today’s revolution in stem cell research.

Stem cells became a hot topic in the first decade of the 21st century because of the controversy over one type: embryonic stem cells. However, stem cell research long predates this controversy.

Recall that a stem cell has a very important property: it can make cells that eventually become another type of cell such as a muscle cell, skin cell, or brain cell (neuron).

Stem cells help our bodies regenerate lost or worn tissue and components such as our blood, liver, and skin.

Humans have understood the idea of regeneration since ancient times, and scientists first started discussing the concept of stem cells in the mid-1800s. Scientists first discovered stem cells in mice bone marrow in the early 1960s.

The very first stem cell therapy (treatment) in humans took place in 1968 with the successful bone marrow transplant for a leukemia patient whose marrow donor was an identical twin. This type of transplant helps the patient because bone marrow contains stem cells that produce new blood cells. Because of stem cell research, other kinds of transplantation and tissue regeneration have become possible.

Over the last few decades, scientists have identified other types of stem cells, including those that produce neurons. Stem cell research is now burgeoning around the world. Scientists use stem cells both to understand human biology and to seek therapies for diseases and traumas.

In August 2001, President George W. Bush stopped federal funding for new embryonic stem cell research because of his belief, shared by a good number of Americans, that such research destroyed human life (the embryo from which the stem cells were taken) and was therefore immoral. In California Bush’s restrictions spurred a successful movement to pass a 2004 ballot initiative, Proposition 71, that skirted the president’s order with state-level funding, created CIRM, and catapulted the state into global leadership in stem cell research.

In recent years, however, new discoveries have lessened the controversy about stem cells. Scientists have made many advances using adult stem cells – those extracted from a living human being without any risk. In 2006 researchers achieved another milestone that reduced the need for embryonic stem cells: they could now take cells from the skin or other parts of the body and reprogram them into a stem cell.

Dr. Alvin King of the University of California, Irvine, displays a neural stem cell on the screen of a microscope (photo by Gene Veritas).

The MSCs, Dr. Nolta’s focus for the past 25 years, are adult stem cells. Everyone has MSCs. They are found in the bone marrow, as well as in fat, dental tissue, and the umbilical cord. They can make bone, tendons, ligaments, and other connective tissues. MSCs grow well in lab conditions, making them a prime candidate for research.

Along with other scientists, in recent years Dr. Nolta and Leslie Thompson, Ph.D., of the University of California, Irvine, another CIRM grantee, began employing stem cells in Huntington’s research. Besides MSCs, HD researchers use human embryonic stem cells, human induced pluripotent stem cells, neural stem cells, and others.

In Dr. Nolta’s assessment, MSCs appear to have especially great potential in treating HD because of their abilities as the body’s “paramedics.” This potential is described in detail below.

From child scientist to MSC expert

Dr. Nolta’s path to the potentially historic MSC HD clinical trial began in childhood and took shape in the midst of the stem cell revolution.

“I think I was probably born a scientist,” she told me during a May 2011 visit to her lab on the occasion of the HDSA Northern California Chapter’s annual convention. “I was the kid that was out in the yard investigating bugs and watching eggs hatch and feeding baby animals that were rescued and trying to understand how caterpillars went through the chrysalis form and came out as moths and butterflies.”

Raised by a single working mom in the small northern California town of Willows and depending on grants and waitressing for her college education, Dr. Nolta received a degree in biology from Sacramento State University in 1984.

After graduation Dr. Nolta took M.A.-level science courses at UC Davis and volunteered in a lab. “We could take stem cells from the bone marrow and culture them,” she recalled. “There was this ‘magical’ potion that we could put them in and culture them for just a few days and could watch them divide and grow into blood cells. I wanted to secretly keep the cultures growing and study them.

“Where I fell in love with mesenchymal stem cells was in 1987. We started doing long-term bone marrow cultures, and there’s a component that grows out when you take a marrow aspirate from a human being that’s a mono-layer of broad, flat cells.  We used to call those the marrow-stromal cells. They later got renamed to mesenchymal stem cells due to their potentiality and all that they can do.”

Dr. Nolta learned that MSCs could assist greatly in gene therapy. Also known as cellular therapy, gene therapy involves the use or alteration of genes to treat disease. Dr. Nolta was impressed with MSCs’ strong ability to assimilate and deliver gene therapy products.

“I realized very quickly that we could engineer them to even better support the other cells in the body,” she explained.

To deepen her knowledge of stem cells and MSCs, Dr. Nolta enrolled in the Ph.D. program in molecular microbiology at the University of Southern California under the mentorship of Dr. Donald Kohn, a specialist in pediatric bone marrow transplantation. At Children’s Hospital Los Angeles she assisted in his pioneering work on bubble baby syndrome, AIDS, and other conditions.

From this experience Dr. Nolta learned the techniques of gene therapy, growing stem cells, and applying stem cell therapies in the clinic. With Dr. Kohn’s team, she performed the first cord blood gene therapy trial for infants born with bubble baby syndrome, a type of serious immune deficiency.

In 2002 the Washington University School of Medicine in St. Louis, one of the nation’s top medical schools, recruited Dr. Nolta to help build its programs in gene therapy and stem cell research. There she continued her work on gene therapy and MSCs and collaborated with her close colleague Gerhard Bauer, Ph.D., in the establishment of a GMP (good manufacturing practice) facility, a highly advanced lab crucial for producing cell and gene therapies.

The power of grassroots advocacy

However, the future of stem cell research lay in California. In 2007 UC Davis lured Dr. Nolta back to her home state to direct its stem cell programs under the umbrella of the brand-new IRC, the Institute for Regenerative Cures. CIRM awarded UC Davis $21 million to construct the IRC and its state-of-the art GMP facility. UC Davis contributed $40 million to the project.

With little knowledge of Huntington’s disease, Dr. Nolta had no plans to include it in her research program at the IRC when she was recruited.

Around the state, however, HD advocates were telling their stories of the desperate need for treatments at the public hearings of the CIRM oversight board. They pushed hard for the CIRM to back HD research.

UC Davis stem cell program manager Geralyn Annett (left), HD patient Sharon Shaffer, Alexa Shaffer,  and Dr. Nolta advocating for HD research at a CIRM board meeting at UC San Diego in 2008 (photo by Gene Veritas)

During her recruitment trip to UC Davis, Dr. Nolta met Dr. Wheelock of the HDSA Center of Excellence.

“Have you ever considered using stem cells to treat Huntington’s disease?” asked Dr. Wheelock as she rode with Dr. Nolta in an elevator.

“You know, for the last 20 years, I have been researching how to use stem cells to treat every part of the body except the brain,” Dr. Nolta responded, citing the critical hurdle of the blood/brain barrier.

“The families impacted by Huntington’s disease are truly remarkable,” Dr. Wheelock rejoined. “I’d love to introduce you to them.”

That conversation spurred Dr. Nolta to take a scientific interest in HD. More importantly, meeting the families deeply moved her. She decided to act.

With initial financial backing from HD advocates from the Sacramento area and elsewhere, Dr. Nolta delved into a project to find a way to use MSCs to combat HD.

Dr. Nolta used her early findings to apply for a grant from CIRM. In 2009 the agency awarded her lab $2.7 million to study the use of genetically reengineered MSCs to block HD at its genetic roots, first in lab dishes, then in mice (explained below).

During our interview at the IRC, Dr. Nolta pointed to the photographs of HD advocates on her desk.

“They change the course of what scientists do,” she said, breaking into tears. “My life was forever changed.”

In all, local fundraising efforts have provided some $100,000 for Dr. Nolta’s work. Donations have included $15,000 from the Deshalamar foundation and $40,000 from Team KJ, an Illinois initiative in support of Kara Jean Fleming, a 40-year-old HD patient. The Joseph P. Roberson Foundation, named for the deceased husband of Judy Roberson, has also supported Dr. Nolta’s work. Many other donors, large and small, have also contributed.

Watching the paramedics in action

With the new $19 million CIRM grant – the largest in Dr. Nolta’s career – she and the UC Davis hope to set their MSC research on the path to a treatment.

The MSCs’ many attributes make them attractive for treating HD.

“They’re very social,” Dr. Nolta explained as she played a highly magnified video in which the MSCs appeared to swim and greet one another like people playing in a swimming pool. “They like to interact with other cells.”

The MSCs also move around the body with great facility, Dr. Nolta added. They can project little tubes, called nanotubules, that tunnel into cells and inject them with necessary items such as proteins and mitochondria, the powerhouses of the cell.

“It’s like giving a cell new batteries,” Dr. Nolta explained. “They just open up a nanotubule and put the new component into the other cell. So that’s why we call them paramedics. It’s like they’re going around with tool kits to repair the other cells…. They like to check out other cells, to see if they’re healthy. They can change what they produce from what they sense from the environment and from the other cells. They just become like little factories.”

“They almost look like living organisms,” I observed.

“They are,” Dr. Nolta said. “They’re alive.”


(Watch the video below to see the MSCs in action.)

Mesenchymal Stem Cells in Action (narrated by Dr. Jan Nolta) from Gene Veritas on Vimeo.

The MSCs’ sociability results in part from the fact that damaged or sick cells and neurons put out “distress signals” that spur the paramedics into action, Dr. Nolta continued.

The same process occurs in the brain, she added. In mice that carry the human Huntington’s gene and have HD-like symptoms, MSCs injected into their brains migrated to the areas of damage.

Transplantations of human tissue often trigger a rejection by the immune systems of the recipients, requiring them to take anti-rejection drugs sometimes for the rest of their lives. This does not occur with MSCs, Dr. Nolta said.

“That’s the beauty of them,” she said. “They’re transplanted from one patient to the next with really no regard to tissue matching. They actually shelter themselves from the immune system through some of the things that they secrete. We think that’s part of their natural function in the body.

“When there’s a wound or a heart attack or some kind of ischemic event, a stroke, they can go to that area, and they want to cause the tissue to heal without scarring. That’s part of their innate mission. They don’t want the immune system to see it while it’s getting fixed up, because you could start making auto-antibodies to that damaged tissue, and then you would destroy that tissue. We think that the MSC just go to the scene of the injury and keep the immune system at bay while they’re doing their remodeling. It’s kind of like keeping everybody out of a construction site.”

The goal: restoring neurons and connections

According to Dr. Nolta, the MSCs secrete substances that help restore the vital connections between neurons. Such connections are lost in HD. Additionally, in secreting BDNF and other brain growth factors, the MSCs can help damaged neurons recover. She likened this scenario to a chain of Christmas lights that, missing a bulb, will go out. Restoring the bulb – a healthy neuron – gets the whole chain working again.

In the case of the proposed clinical trial, the UC Davis team will ramp up the MSCs’ capability to provide BDNF. In mice tests, they have increased that capability by a hundredfold.

The big question, Dr. Nolta told me in an interview on July 30, 2012, is this: how effective will MSCs prove in helping the entire striatum, an area of the brain deeply compromised by HD and where the MSCs will be injected?

“The MSCs can secrete huge amounts of BDNF, so that might be effective” in helping to restore the striatum, she said.

Attacking HD’s genetic roots

If the MSC BDNF trial proves successful, the UC Davis team could use another up-and-coming tool for combatting HD: RNA interference.

In designing a substance known as a small interference RNA molecule (siRNA), other researchers have already reducedthe amount of harmful huntingtin protein in the brains of test animals. A similar approach, known as antisense, has demonstrated similar results.  Both approaches should enter clinical trials within the next few years, if not sooner.

Still in the early stages of this aspect of their research, Dr. Nolta and her UC Davis HD team have discovered a way to deliver siRNA into cells in a dish using MSCs.

Some researchers are examining ways to implant new neurons or fetal-striatal stem cells into patients’ brains to repair the damage caused by HD. However, Dr. Nolta pointed out that those cells could become affected by HD.

The use of siRNA could protect those and other cells from HD. Dr. Nolta has photos and video of the MSC nanotubules transferring siRNA into other cells. Her lab is now testing MSC siRNA in mice.

Controlling the huntingtin gene and protein effectively is the “holy grail” of HD research because it would allow gene-positive, non-symptomatic people like me to take a preventative treatment.

‘A super, super clean place’

Although the human brain has MSCs, in HD people those MSCs make the same mutant huntingtin as the other cells in the brain and, indeed, in the rest of the body. Compromised in this manner, the MSCs in HD people’s brains cannot make necessary levels of BDNF.

As a result, for the Phase I MSC BDNF trial, the HD team will make batches of MSCs from bone marrow cells provided by a healthy donor and therefore containing normal, non-disease-causing huntingtin.

Federal regulations require GMP for any substance that will be tested in humans. Thus, in the run-up to Phase I, the MSC batches will be made at the UC Davis Institute for Regenerative Cure’s GMP facility. It could make enough MSCs for 100 patients, Dr. Nolta said.

“You need your own facility to get up to this scale,” she commented. “How to manufacture these batches of cells is a whole industry in and of itself. It’s usually companies that would do this. Sometimes they charge exorbitant fees.”

This level of “scale-up” to a clinical trial is “our forte here,” Dr. Nolta told me in our recent interview. The National Institutes of Health and insurance companies don’t fund these kinds of initiatives, she noted, leading many drug candidates with good potential to “fall into the valley of death.”

During my visit to the IRC, she referred to the GMP as a “super, super clean place.” It will triple-check the quality of the MSCs.

As explained to me by GMP specialist Bill Gruenloh, normal air contains hundreds of millions of particles per cubic foot. Air handlers and HEPA filters reduce the number of particles in the manufacturing room to only 10,000. Areas under tissue culture hoods have just 100. In addition, the highly specialized GMP employees maintain meticulous records of every article in the facility. A computer constantly monitors the GMP, and the employees double-check readings with hand-held instruments. Thus no micro-organisms are present in critical areas of the GMP.

If a contamination or other problem occurs with a test drug, the GMP records help trace the cause, Gruenloh said. 

UC Davis GMP specialist John Walker at work (photo by Gene Veritas)

The GMP also stores stem cells and other items at carefully controlled, very low temperatures. The UC Davis GMP developed the first GMP-grade cell-sorter in the world, Gruenloh added.

In addition, the GMP houses its own quality control lab to check the safety of products and verify that they are free of contaminants and bacteria.

Putting the project in perspective

As Dr. Nolta has pointed out on several occasions, more than 10,000 patients worldwide have already received MSCs infused into the blood stream. In fact, the drug regulatory agencies of Canada and New Zealand have already approved the use of MSCs to be prescribed as a drug to treat certain diseases, although not yet HD. In addition, at least four companies are currently testing MSCs or MSC-like cells in clinical trials for other neurodegenerative conditions.

As always, we need to recall that only 10 percent of clinical trials ever lead to an actual drug. Mathematically speaking, the odds are stacked against the Nolta-Wheelock project.

Even if the Phase I trial proves a dramatic success, the UC Davis team will need to find ways to fund Phases II and III, which will require larger numbers of participants and thus cost more money. Backed by public bonds, CIRM will run out of money in about four years, unless the agency can attract private investors. At least for now, the state of California’s dire fiscal situation makes further public funding unlikely, although one cannot predict the mood of the voters.

With an eye to the future, Dr. Nolta and UC Davis have secured a patent for the MSC siRNA delivery technology in the hopes that a pharmaceutical firm or other private investor might risk supporting further research and testing in exchange for some of the potential profits from a drug. She noted that companies visit the IRC regularly, although none has yet expressed an interest in supporting HD work.

Despite these caveats, I am struck by the apparent simplicity of the UC Davis approach: using human cells as a way to deliver remedies to the brain.

I am also impressed with the UC Davis team’s boldness in moving as quickly as possible towards a clinical trial. In fact, some scientists think they’re moving too quickly with their siRNA plans, although Dr. Nolta characterized their criticism as a “misunderstanding” of her project, since it is the BDNF trial, not the siRNA, that is moving toward the clinic first. The siRNA studies are only in early rodent testing.

A successful MSC HD trial would extend immense hope to patients suffering from other neurological diseases (such as Alzheimer’s and Parkinson’s), as well as ischemia, heart disease, and other conditions, Dr. Nolta said. Such hope would likely translate into greater private funding for MSC research.

Hope, realism, and future advocacy

California’s HD stem cell advocates – along with fellow HD activists around the world – can feel confident that CIRM is having an important impact on HD research.

We now await the MSC trial results – and with great hope!

However, we should also proceed with patience and realism.

Science takes time.

Furthermore, most scientists think that treating HD successfully will require a cocktail of remedies, not just one.

With grassroots support for, and intense interest in, the UC Davis HD program, the HD community is betting heavily that MSCs will provide a way to alleviate the conditions’ horrific symptoms.

Judging from the unprecedented excitement about the CIRM grant that I have witnessed in the HD Facebook community in comparison with news about other breakthroughs, I think people perceive stem cells as providing the greatest hope. Indeed, for many Americans, stem cells seem to hold an almost magical appeal, as they once did for the young Jan Nolta at the start of her career. People seem to sense viscerally that they can provide cures and replace lost cells and tissues. Could stem cells represent our new Fountain of Youth?

Naturally, we all want, need, and deserve to celebrate the CIRM award.

I myself have advocated for California stem cell research for more than a decade through HDSA-San Diego. Having lost my mother to HD in 2006 at the age of 68 and tested positive for HD in 1999, I anxiously await treatments. When people told me that potential stem cell breakthroughs lay too far in the future to offer me hope, my resolve to fight only strengthened.

Yet we should also keep in mind that scientists are working just as hard on numerous other, highly important approaches. They don’t stir the controversy and publicity that have surrounded stem cells, and many are extremely difficult to understand, but they could very well lead to effective treatments.

In effect, the Nolta-Wheelock project is another “shot on goal” in the search for HD treatments. The CHDI Foundation,Inc., the major private backer of HD drug research, and its collaborators will attempt as many as eight such shots in the next few years. The more shots, the better the chances of finding treatments and a cocktail.

In the meantime, just as Dr. Nolta, the UC Davis team, and scientists around the world work feverishly to liberate us from HD, we in the HD community must continue to strategically advocate for our cause, creatively help change the course of science, and participate in the crucial research studies and clinical trials that provide the key to defeating HD.

* * *

Additional information

Once the UC Davis trial is approved the FDA, details of how to participate will become available at www.clinicaltrials.gov.

For an HD family member’s account of the historic CIRM meeting, read Katie Jackson’s report at The Huntington’s Post.

To learn more about Dr. Nolta’s research, read an article by Dr. Marsha Miller by clicking here.

For the official CIRM evaluation of the project, please click here.

For in-depth reporting on CIRM’s activities, see California Stem Cell Report.

You can also read an impassioned defense of stem cell research by global HD advocate Charles Sabine.

HD scientist Dr. Elena Cattaneo provides an update on the European Union’s support for stem cell research.

For an overview of stem cells, see Stem Cells for Dummies.

On stem cells and HD, also see www.HDBuzz.net.

To see a presentation by Dr. Nolta on MSCs and HD, watch the video below.

Towards Stem-Cell Treatments for Huntington's Disease: Talk by Dr. Jan Nolta from Gene Veritas on Vimeo.