It’s appropriate that at the start of Women’s History Month, UC Davis’ Dr. Diana Farmer is making a little history of her own. She launched the world’s first clinical trial using stem cells to treat spina bifida before the child is born.
Spina bifida is a birth defect caused when a baby’s spinal cord fails to develop properly in the womb. In myelomeningocele, the most severe form of spina bifida, a portion of the spinal cord or nerves is exposed in a sac through an opening in the spine. Most people with myelomeningocele have changes in their brain structure, leg weakness, and bladder and bowel dysfunction.
While surgery can help, Dr. Farmer says it is far from perfect: “Currently, the standard of care for our patients is fetal surgery, which, while promising, still leaves more than half of children with spina bifida unable to walk independently. There is an extraordinary need for a treatment that prevents or lessens the severity of this devastating condition. Our team has spent more than a decade working up to this point of being able to test such a promising therapy.”
The team at UC Davis – in a CIRM-funded study – will use a stem cell “patch” that is placed over the exposed spinal cord, then surgically close the opening, hopefully allowing the stem cells to regenerate and protect the spinal cord.
In a news release Dr. Aijun Wang, a stem cell bioengineer, says the team has been preparing for this trial for years, helping show in animals that it is safe and effective. He is hopeful it will prove equally safe and effective in people: “Our cellular therapy approach, in combination with surgery, should encourage tissue regeneration and help patients avoid devastating impairments throughout their lives.”
Dr. Farmer says the condition, while rare, disproportionately affects Latinx babies and if the procedure works could have an enormous impact on their lives and the lives of their families: “A successful treatment for MMC would relieve the tremendous emotional and economic cost burden on families. We know it initially costs approximately $532,000 per child with spina bifida. But the costs are likely several million dollars more due to ongoing treatments, not to mention all the pain and suffering, specialized childcare, and lost time for unpaid caregivers such as parents.”
Here is video of two English bulldogs who had their spinal injuries repaired at UC Davis using stem cells. This was part of the research that led to the clinical trial led by Dr. Farmer and Dr. Wang.
All this month we are using our blog and social media to highlight a new chapter in CIRM’s life, thanks to the voters approving Proposition 14. We are looking back at what we have done since we were created in 2004, and also looking forward to the future.Today we feature a blog written by two of our fabulous Discovery and Translation team Science Officers, Dr. Kent Fitzgerald and Dr. Ross Okamura.
If you believe that you can know a person by their deeds, the partnership opportunities offered by CIRM illustrate what we, as an agency, believe is the most effective way to deliver on our mission statement, accelerating regenerative medicine treatments to patients with unmet medical needs.
In our past, we have offered awards covering basic biology projects which in turn provided the foundation to produce promising therapies to ease human suffering. But those are only the first steps in an elaborate process.
In order to bring these potential therapies to the clinic, selected drug candidates must next go through a set of activities designed to prepare them for review by the Food and Drug Administration (FDA). For cell therapies, the first formal review is often the Pre- Investigational New Drug Application Consultation or pre-IND. This stage of drug development is commonly referred to as Translational, bridging the gap between our Discovery or early stage research and Clinical Trial programs.
One of our goals at CIRM is to prepare Translational projects we fund for that pre-IND meeting with the FDA, to help them gather data that support the hope this approach will be both safe and effective in patients. Holding this meeting with the FDA is the first step in the often lengthy process of conducting FDA regulated clinical trials and hopefully bringing an approved therapy to patients.
What type of work is required for a promising candidate to move from the Discovery stage into FDA regulated development? To address the needs of Translational science, CIRM offers the Translational Research Project funding opportunity. Activities that CIRM supports at the Translational stage include:
Process Development to allow manufacturing of the candidate therapy under Good Manufacturing Practices (GMP). This is to show that they can manufacture at a large enough scale to treat patients.
Assay development and qualification of measurements to determine whether the drug is being manufactured safely while retaining its curative properties.
Studies to determine the optimal dose and the best way to deliver that dose.
Pilot safety studies looking how the patient might respond after treatment with the drug.
The development of a clinical plan indicating under what rules and conditions the drug might be prescribed to a patient.
These, and other activities supported under our Translational funding program, all help to inform the FDA when they consider what pivotal studies they will require prior to approving an Investigational New Drug (IND) application, the next step in the regulatory approval process.
Since CIRM first offered programs specifically aimed at addressing the Translational stage of therapeutic candidates we have made 41 awards totaling approximately $150 million in funding. To date, 13 have successfully completed and achieved their program goals, while 19 others are still actively working towards meeting their objective. Additionally, three (treating Spina Bifida, Osteonecrosis, and Sickle Cell Disease) of the 13 programs have gone on to receive further CIRM support through our Clinical Stage programs.
During our time administering these awards, CIRM has actively partnered with our grantees to navigate what is required to bring a therapy from the bench to the bedside. CIRM operationalizes this by setting milestones that provide clear definitions of success, specific goals the researchers have to meet to advance the project and also by providing resources for a dedicated project manager to help ensure the project can keep the big picture in mind while executing on their scientific progress.
Throughout all this we partner with the researchers to support them in every possible way. For example, CIRM provides the project teams with Translational Advisory Panels (TAPs, modeled after the CIRM’s Clinical Advisory Panels) which bring in outside subject matter experts as well as patient advocates to help provide additional scientific, regulatory and clinical expertise to guide the development of the program at no additional cost to the grantees. One of the enduring benefits that we hope to provide to researchers and organizations is a practical mastery of translational drug development so that they may continue to advance new and exciting therapies to all patients.
Through CIRM’s strong and continued support of this difficult stage of development, CIRM has developed an internal practical expertise in advancing projects through Translation. We employ our experience to guide our awardees so they can avoid common pitfalls in the development of cell and gene therapies. The end goal is simple, helping to accelerate their path to the clinic and fulfilling the mission of CIRM that has been twice given to us by the voters of California, bringing treatments to patients suffering from unmet medical needs.
This past Thursday the governing Board of the California Institute for Regenerative Medicine (CIRM) approved four new clinical trials in addition to ten new discovery research awards.
These new awards bring the total number of CIRM-funded clinical trials to 68. Additionally, these new additions have allowed the state agency to exceed the goal of commencing 50 new trials outlined in its five year strategic plan.
$8,970,732 was awarded to Dr. Steven Deeks at the University of California San Francisco (UCSF) to conduct a clinical trial that modifies a patient’s own immune cells in order to treat and potentially cure HIV.
Current treatment of HIV involves the use of long-term antiretroviral therapy (ART). However, many people are not able to access and adhere to long-term ART.
Dr. Deeks and his team will take a patient’s blood and extract T cells, a type of immune cell. The T cells are then genetically modified to express two different chimeric antigen receptors (CAR), which enable the newly created duoCAR-T cells to recognize and destroy HIV infected cells. The modified T cells are then reintroduced back into the patient.
The goal of this one time therapy is to act as a long-term control of HIV with patients no longer needing to take ART, in effect a form of HIV cure. This approach would also address the needs of those who are not able to respond to current approaches, which is estimated to be 50% of those affected by HIV globally.
$3,728,485 was awarded to Dr. Gayatri Rao from Rocket Pharmaceuticals to conduct a clinical trial using a gene therapy for infantile malignant osteopetrosis (IMO), a rare and life-threatening disorder that develops in infancy. IMO is caused by defective bone cell function, which results in blindness, deafness, bone marrow failure, and death very early in life.
The trial will use a gene therapy that targets IMO caused by mutations in the TCIRG1 gene. The team will take a young child’s own blood stem cells and inserting a functional version of the TCIRG1 gene. The newly corrected blood stem cells are then introduced back into the child, with the hope of halting or preventing the progression of IMO in young children before much damage can occur.
Rocket Pharmaceuticals has used the same gene therapy approach for modifying blood stem cells in a separate CIRM funded trial for a rare pediatric disease, which has shown promising results.
$8,996,474 was awarded to Dr. Diana Farmer at UC Davis to conduct a clinical trial of in utero repair of myelomeningocele (MMC), the most severe form of spina bifida. MMC is a birth defect that occurs due to incomplete closure of the developing spinal cord, resulting in neurological damage to the exposed cord. This damage leads to lifelong lower body paralysis, and bladder and bowel dysfunction.
Dr. Farmer and her team will use placenta tissue to generate mesenchymal stem cells (MSCs). The newly generated MSCs will be seeded onto an FDA approved dural graft and the product will be applied to the spinal cord while the infant is still developing in the womb. The goal of this therapy is to help promote proper spinal cord formation and improve motor function, bladder function, and bowel function.
$8,333,581 was awarded to Dr. David Williams at Boston Children’s Hospital to conduct a gene therapy clinical trial for sickle cell disease (SCD). This is the second project that is part of an agreement between CIRM and the National Heart, Lung, and Blood Institute (NHLBI), part of the National Institutes of Health, to co-fund cell and gene therapy programs under the NHLBI’s “Cure Sickle Cell” Initiative. The goal of this agreement is to markedly accelerate clinical development of cell and gene therapies to cure SCD.
SCD is an inherited disease caused by a single gene mutation resulting in abnormal hemoglobin, which causes red blood cells to ‘sickle’ in shape. Sickling of red blood cells clogs blood vessels and leads to progressive organ damage, pain crises, reduced quality of life, and early death.
The team will take a patient’s own blood stem cells and insert a novel engineered gene to silence abnormal hemoglobin and induce normal fetal hemoglobin expression. The modified blood stem cells will then be reintroduced back into the patient. The goal of this therapy is to aid in the production of normal shaped red blood cells, thereby reducing the severity of the disease.
“Today is a momentus occasion as CIRM reaches 51 new clinical trials, surpassing one of the goals outlined in its five year strategic plan,” says Maria T. Millan, M.D., President and CEO of CIRM. “These four new trials, which implement innovative approaches in the field of regenerative medicine, reflect CIRM’s ever expanding and diverse clinical portfolio.”
The Board also approved ten awards that are part of CIRM’s Quest Awards Prgoram (DISC2), which promote promising new technologies that could be translated to enable broad use and improve patient care.
The awards are summarized in the table below:
Human-induced pluripotent stem cell-derived glial enriched progenitors to treat white matter stroke and vascular dementia.
Development of COVID-19 Antiviral Therapy Using Human iPSC-Derived Lung Organoids
UC San Diego
Hematopoietic Stem Cell Gene Therapy for X-linked Agammaglobulinemia
Development of a SYF2 antisense oligonucleotide (ASO) treatment for ALS
University of Southern California
Dual angiogenic and immunomodulating nanotechnology for subcutaneous stem cell derived islet transplantation for the treatment of diabetes
Human iPSC-derived chimeric antigen receptor-expressing macrophages for cancer treatment
UC San Diego
Optimization of a human interneuron cell therapy for traumatic brain injury
Combating COVID-19 using human PSC-derived NK cells
City of Hope
The First Orally Delivered Cell Therapy for the Treatment of Inflammatory Bowel Disease
Transplantation of Pluripotent Stem Cell Derived Microglia for the Treatment of Adult-onset Leukoencephalopathy (HDLS/ALSP)
Every so often you hear a story and your first reaction is “oh, I have to share this with someone, anyone, everyone.” That’s what happened to me the other day.
I was talking with Kristin MacDonald, an amazing woman, a fierce patient advocate and someone who took part in a CIRM-funded clinical trial to treat retinitis pigmentosa (RP). The disease had destroyed Kristin’s vision and she was hoping the therapy, pioneered by jCyte, would help her. Kristin, being a bit of a pioneer herself, was the first person to test the therapy in the U.S.
Anyway, Kristin was doing a Zoom presentation and wanted to look her best so she asked a friend to come over and do her hair and makeup. The woman she asked, was Rosie Barrero, another patient in that RP clinical trial. Not so very long ago Rosie was legally blind. Now, here she was helping do her friend’s hair and makeup. And doing it beautifully too.
That’s when you know the treatment works. At least for Rosie.
There are many other stories to be heard – from patients and patient advocates, from researchers who develop therapies to the doctors who deliver them. – at our CIRM 2020 Grantee Meeting on next Monday September 14th Tuesday & September 15th.
It’s two full days of presentations and discussions on everything from heart disease and cancer, to COVID-19, Alzheimer’s, Parkinson’s and spina bifida. Here’s a link to the Eventbrite page where you can find out more about the event and also register to be part of it.
Like pretty much everything these days it’s a virtual event so you’ll be able to join in from the comfort of your kitchen, living room, even the backyard.
And it’s free!
You can join us for all two days or just one session on one day. The choice is yours. And feel free to tell your friends or anyone else you think might be interested.
Some of you might remember a movie in the early 2000s by the name of “Miracle in Lane 2”. The film is based on an inspirational true story and revolves around a boy named Justin Yoder entering a soapbox derby competition. In the movie, Justin achieves success as a soapbox derby driver while adapting to the challenges of being in a wheelchair.
The reason that Justin is unable to walk is due to a birth defect known as spina bifida, which causes an incomplete closing of the backbone portion of the spinal cord, exposing tissue and nerves. In addition to difficulties with walking, other problems associated with this condition are problems with bladder or bowel control and accumulation of fluid in the brain.
According to the Center for Disease Control (CDC) , each year about 1,645 babies in the US are born with spina bifida, with Hispanic women having the highest rate of children born with the condition. There is currently no cure for this condition, but researchers at UC Davis are one step closer to changing that.
Dr. Aijun Wang, Dr. Diana Farmer, and their research team have identified crucial byproducts produced by stem cells that play an important role in protecting neurons. These byproducts could assist with improving lower-limb motion in patients with spina bifida.
Prior to this discovery, Dr. Farmer and Dr. Wang demonstrated that prenatal surgery combined with connective tissue (e.g. stromal cells) derived from stem cells improved hind limb control in dogs with spina bifida. Below you can see a clip of two English bulldogs with spina bifida who are now able to walk.
By any standards Dr. Diana Farmer is a determined woman who doesn’t let setbacks and failure deter her. As a fetal and neonatal surgeon, and the chair of the Department of Surgery at UC Davis Health, Dr. Farmer has spent years trying to develop a cure for spina bifida. She’s getting closer.
Dr. Farmer and her partner in this research, Dr. Aijun Wang, have already shown they can repair the damage spina bifida causes to the spinal cord, in the womb, in sheep and bulldogs. Last year the CIRM Board voted to fund her research to get the data needed to apply to the US Food and Drug Administration for permission to start a clinical trial in people.
That work is so promising that we decided to profile Dr. Farmer in our 2018 Annual Report.
Here’s excerpts from an interview we conducted with her as part of the Annual Report.
I have been working on this since 2008. We have been thinking about how to help kids with spina bifida walk. It’s not fatal disease but it is a miserable disease.
It’s horrible for parents who think they are about to have a healthy child suddenly be faced with a baby who faces a life long struggle with their health, everything from difficulty or inability to walk to bowel and bladder problems and life-threatening infections.
As a fetal surgeon we used to only focus on fatal diseases because otherwise kids would die. But as we made progress in the field, we had the opportunity to help others who didn’t have a fatal condition, in ways we couldn’t have done in the past.
I’ve always been fascinated by the placenta, it has lots of protective properties. So, we asked the question if we were able to sample fetal cells from the placenta, could we augment those cells, and use them to tissue engineer spinal injuries, in the womb, to improve the outcome for kids with spina bifida?
Dr. Aijun Wang and I have been working on this project for the last decade. Ten years of work has taken us to this point where we are now ready to move this to the next level.
It’s amazing to me how long this process takes and that’s why we are so grateful to CIRM because this is a rare disease and finding funding for those is hard. A lot of people are scared about funding fetal surgery and CIRM has been a perfect partner in helping bring this approach, blending stem cell therapy and tissue engineering, together.
If this therapy is successful it will have a huge economic impact on California, and on the rest of the world. Because spina bifida is a lifelong condition involving many operations, many stays in the hospital, in some cases lifelong use of a wheelchair. This has a huge financial burden on the family. And because this doesn’t just affect the child but the whole family, it has a huge psychological burden on families. It affects them in so many ways; parents having to miss work or take time off work to care for their child, other children in the family feeling neglected because their brother or sister needs so much attention.
In the MOMS Trial (a study that looked at prenatal – before birth – and postnatal – after birth – surgery to repair a defect in the spinal cord and showed that prenatal surgery had strong, long-term benefits and some risks) we showed that we could operate on the fetus before birth and help them. The fact that there was any improvement – doubling the number of kids who could walk from 20 to 40% showed this spinal cord injury is not a permanent situation and also showed there was some plasticity in the spinal cord, some potential for improvement. And so, the next question was can we do more. And that’s why we are trying this.
It’s pretty amazing. We are pretty excited.
The thing that makes surgeon-scientists feel so passionate is that we don’t just ask the fundamental questions, we ask questions in order to cure a problem in patients. I grew up in an environment where people were always asking “how can we do it better, how can we improve?”
There were many times of frustration, many times when cell types we explored and worked with didn’t work. But it’s the patients, seeing them, that keeps me motivated to do the science, to keep persevering. That’s the beauty of being a clinician-scientist. We can ask questions in a different way and look at data in a different way because we are driven by patient outcomes. So, whenever we get stuck in the rabbit hole of theoretical problems, we look to the patients for inspiration to keep going.
I am very cognizant of stirring up false hope, knowing that what occurs in animal models doesn’t always translate into humans. But we are optimistic, and I am anxious to get going.
Every day in the U.S. four children are born with spina bifida. It is the most common cause of lifelong paralysis and also frequently leads to other serious health problems affecting the bowel and bladder. The impact on families is enormous. A new approach to repairing the defect that causes spina bifida was today awarded $5.66 million by the Board of the California Institute for Regenerative Medicine (CIRM).
In spina bifida the spinal cord doesn’t form properly, in many cases leaving a section of it open, exposing tissues and nerves. The current standard of care is surgery, but even this leaves almost 60% of children unable to walk independently. Diana Farmer MD, and Aijun Wang PhD at U.C. Davis will use mesenchymal stem cells, taken from a donor placenta, and place them on a form of synthetic scaffold over the injury site in the womb. Tests in animals show this approach was able to repair the defect and prevent paralysis.
“Spina bifida is a devastating condition for babies born with this disorder and the families who care for them,” says Maria T. Millan, MD, President & CEO of CIRM. “CIRM has funded this important work from its earliest stages and we are committed to working with Dr. Farmer’s team to moving this work to the stage where it can be tested in patients.”
The CLIN1 award will provide funding to enable the UC Davis team to do the final testing and preparations needed to apply to the FDA for permission to start a clinical trial.
Dr. Farmer says she and Dr. Wang, have been working on this approach for more than ten years and are excited about being able to take the next step.
“There were many times of frustration, many times when cell types we explored and worked with didn’t work,” says Dr. Farmer. “But it’s the patients, seeing them, talking to them and working with them, that keeps me motivated to do the science, to keep persevering.”
If this therapy is successful it will have a huge economic impact on California, and on the rest of the world. Because spina bifida is a lifelong condition involving many operations, many stays in the hospital and, in some cases, lifelong use of a wheelchair this has a huge financial, and psychological, burden on the family.
“It affects them in so many ways; parents having to miss work or take time off work to care for their child, other children in the family feeling neglected because their brother or sister needs so much attention,” says Dr. Farmer. “That’s why we are so grateful to CIRM. Because this is a rare disease and finding funding for those is hard. CIRM has been a perfect partner in helping bring this approach, blending stem cell therapy and tissue engineering, together to help these families.”
This video shows English bulldogs treated with this approach who are now able to walk:
Every year, the second Wednesday in October is set aside as Stem Cell Awareness Day, a time to celebrate the progress being made in the field and to remind us of the challenges that lie ahead.
While the event began here in California in 2008, with then-Governor Arnold Schwarzenegger highlighting the work of CIRM, saying: ”The discoveries being made today in our Golden State will have a great impact on many around the world for generations to come.” It has since grown to become a global event.
At UC Davis Jan Nolta, PhD., the Director of the Stem Cell Program, introduced a series of speakers who highlighted the terrific work being done at the university. Peter Belafsky talked about using stem cells to repair damaged trachea and to help people who are experiencing voice or swallowing disorders. Mark Lee highlighted the progress being made in using stem cells to repair hard-to-heal broken bones. Aijun Wang focused on some really exciting work that could one day lead to a therapy for spina bifida (including some ridiculously cute video of English bulldogs who are able to walk again because of this therapy.)
USC hosted 100 local high school students for a panel presentation and discussion about careers in stem cell research. The panel featured four scientists talking about their experience, why the students should think about a career in science and how to go about planning one. USC put together a terrific video of the researchers talking about their experiences, something that can help any student around the US consider becoming part of the future of stem cell research.
Similar events were held in other institutions around California. But the celebration wasn’t limited to the Golden State. At the Texas Heart Institute in Houston, Texas, they held an event to talk to the public about the clinical trials they are supporting using stem cells to help people suffering from heart failure or other heart-related issues.
Finally, the UK-based RegMedNet, a community site that unites the diverse regenerative medicine community, marked the day by exploring some of the myths and misconceptions still surrounding stem cells and stem cell research.
Every group takes a different approach to celebrating Stem Cell Awareness Day, but each is united by a common desire, to help people understand the progress being made in finding new treatments and even cures for people with unmet medical needs.
Just when you thought puppies couldn’t get any cuter, this video appears in your twitter feed.
These adorable English bulldog puppies are named Darla and Spanky, and they were born with a birth defect called spina bifida where the bones and tissue surrounding the spinal cord fail to fuse completely. Spina bifida occurs in 1500-2000 children in the US each year and can cause serious problems such as paralysis and issues with walking, cognition, and bladder or bowel control. Dogs born with this condition usually cannot use their hind legs, and as a sad consequence, are typically put down at a young age.
Cutting edge research from UC Davis is now giving these unfortunate puppies hope. Diana Farmer, a fetal surgeon at UC Davis Health, and scientists from the university’s Veterinary Institute for Regenerative Cures have developed a combination surgery and stem cell transplant, using placenta-derived mesenchymal stromal cells (PMSCs), to treat puppies with spina bifida. Because prenatal screening for spina bifida is not done in dogs, Darla and Spanky received the treatment when they were ten weeks old.
“Farmer pioneered the use of surgery prior to birth to improve brain development in children with spina bifida. She later showed that prenatal surgery combined with human placenta-derived mesenchymal stromal cells (PMSCs), held in place with a cellular scaffold, helped research lambs born with the disorder walk without noticeable disability.”
As you can see from the video, the surgeries were a success. Darla and Spanky are now able to live up to their full puppy potential and will live happily ever after with their adoptive family in New Mexico.
Looking forward, Farmer and her team would like to treat more dogs with spina bifida so they can improve another negative consequence of spina bifida called incontinence, or an uncontrollable bladder. The UC Davis release explained that, “while Darla and Spanky are very mobile and doing well on their feet, they still require diapers.” (Side note: this video proves that puppies can make anything look cute, even dirty diapers.)
Additionally, the team is hoping to receive regulatory approval from the US Food and Drug Administration to launch a clinical trial testing this therapy in humans. If this stem cell treatment proves to be both safe and effective in clinical trials, it could potentially prevent spina bifida from ever happening in animals and in humans.
English Bulldog undergoing spina bifida surgery at UC Davis Veterinary Medical Teaching Hospital. (Gregory Urquiaga/UC Davis)
As far-fetched as it may sound, performing prenatal surgery on a fetus still growing inside its mother’s womb is actually possible. This specialized procedure is done to repair birth defects like spina bifida, in which a baby’s back bones don’t form properly around the spinal cord. This opening in the spine that leads to excess spinal fluid and leaves spinal cord nerve cells unprotected from the surrounding tissue. These abnormalities can lead to brain damage, paralysis and loss of bladder control.
Although prenatal surgery to close up the defect can reduce future neurological problems in the child’s life, there is an increased danger of significant complications including preterm birth, separation of the placenta from the uterus and premature breaking on the amniotic membrane (ie breaking the mother’s water).
Microscopy image of iSkin, three-dimensional cultured skin derived from human iPSCs. Credit: Kazuhiro Kajiwara.
A research team at Japan’s National Research Institute for Child Health and Development is trying to overcome these problems by developing a less invasive prenatal therapy for spina bifida using stem cells. And this week, they published a Stem Cell Reports study that shows encouraging preclinical results in rodents.
The most severe and common form of spina bifida called myelomeningocele usually leads to the formation of a fluid-filled bulge protruding from a newborn’s back. The team’s therapeutic approach is to graft 3D layers of stem cell-derived skin early in the pregnancy to prevent the bulge from forming in the first place. This minimally invasive procedure would hopefully be less risky than the surgical approach.
To demonstrate a proof of concept for this approach, skin graft experiments were performed on fetal rats that had myelomeningocele-like symptoms induced by the hormone retinoic acid. Human amniotic fluid cells collected from two pregnancies with severe fetal defects were used to derived human iPSCs which were then specialized into skin cells. Over a 14-week period – a timeline short enough to allow the eventual human procedure to be performed within the 28th to 29th week of pregnancy – the cells were grown into 3D layers they call, “iSkin”.
The iSkin grafts were transplanted in 20 fetal rats through a small cut into the wall of the uterus. At birth, the myelomeningocele defect in four rats was completely covered and partially covered in another eight rats. It’s encouraging to note that no tumors formed from the skin transplants, a concern when dealing with iPSC-derived cell therapies. In press release, team lead Dr. Akihiro Umezawa spoke about the promise of this approach but also the work that still lies ahead:
“We are encouraged by our results and believe that our fetal stem cell therapy has great potential to become a novel treatment for myelomeningocele. However, additional studies in larger animals are needed to demonstrate that our fetal stem cell therapy safely promotes long-term skin regeneration and neurological improvement.”