In 2005, the New Oxford American Dictionary named “podcast” its word of the year. At the time a podcast was something many had heard of but not that many actually tuned in to. My how times have changed. Now there are some two million podcasts to chose from, at least according to the New York Times, and who am I to question them.
Yesterday, in the same New York Times, TV writer Margaret Lyons, wrote about how the pandemic helped turn her from TV to podcasts: “Much in the way I grew to prefer an old-fashioned phone call to a video chat, podcasts, not television, became my go-to medium in quarantine. With their shorter lead times and intimate production values, they felt more immediate and more relevant than ever before.”
I mention this because an old colleague of ours at CIRM, Neil Littman, has just launched his own podcast and the first guest on it was Jonathan Thomas, Chair of the CIRM Board. Their conversation ranged from CIRM’s past to the future of the regenerative field as a whole, with a few interesting diversions along the way. It’s fun listening. And as Margaret Lyons said it might be more immediate and more relevant than ever before.
A search on Google using the term “stem cell blogs” quickly produces a host of sites offering treatments for everything from ankle, hip and knee problems, to Parkinson’s disease and asthma. Amazingly the therapies for those very different conditions all use the same kind of cells produced in the same way. It’s like magic. Sadly, it’s magic that is less hocus pocus and more bogus bogus.
The good news is there are blogs out there (besides us, of course) that do offer good, accurate, reliable information about stem cells. The people behind them are not in this to make a quick buck selling snake oil. They are in this to educate, inform, engage and enlighten people about what stem cells can, and cannot do.
This blog has just undergone a face lift and is now as colorful and easy to read as it is informative. It bills itself as the longest running stem cell blog around. It’s run by UC Davis stem cell biologist Dr. Paul Knoepfler – full disclosure, we have funded some of Paul’s work – and it’s a constant source of amazement to me how Paul manages to run a busy research lab and post regular updates on his blog.
The power of The Niche is that it’s easy for non-science folk – like me – to read and understand without having to do a deep dive into Google search or Wikipedia. It’s well written, informative and often very witty. If you are looking for a good website to check whether some news about stem cells is real or suspect, this is a great place to start.
This site is run by another old friend of CIRM’s, Don Reed. Don has written extensively about stem cell research in general, and CIRM in particular. His motivation to do this work is clear. Don says he’s not a doctor or scientist, he’s something much simpler:
“No. I am just a father fighting for his paralyzed son, and the only way to fix him is to advance cures for everyone. Also, my mother died of breast cancer, my sister from leukemia, and I myself am a prostate cancer survivor. So, I have some very personal reasons to support the California Institute for Regenerative Medicine and to want state funding for stem cell and other regenerative medicine research to continue in California!”
The power of Don’s writing is that he always tells human stories, real tales about real people. He makes everything he does accessible, memorable and often very funny. If I’m looking for ways to explain something complex and translate it into everyday English, I’ll often look at Don’s work, he knows how to talk to people about the science without having their eyes cloud over.
This is published by the International Society for Stem Cell Research (ISSCR), the leading professional organization for stem cell scientists. You might expect a blog from such a science-focused organization to be heavy going for the ordinary person, but you’d be wrong.
A Closer Look at Stem Cells is specifically designed for people who want to learn more about stem cells but don’t have the time to get a PhD. They have sections explaining what stem cells are, what they can and can’t do, even a glossary explaining different terms used in the field (I used to think the Islets of Langerhans were small islands off the coast of Germany till I went to this site).
One of the best, and most important, parts of the site is the section on clinical trials, helping people understand what’s involved in these trials and the kinds of things you need to consider before signing up for one.
Of course, the US doesn’t have a monopoly on stem cell research and that’s reflected in the next two choices. One is the Signals Blog from our friends to the north in Canada. This is an easy-to-read site that describes itself as the “Insiders perspective on the world of stem cells and regenerative medicine.” The ‘Categories ‘dropdown menu allows you to choose what you want to read, and it gives you lots of options from the latest news to a special section for patients, even a section on ethical and legal issues.
As you may have guessed from the title this is by our chums across the pond in Europe. They lay out their mission on page one saying they want to help people make sense of stem cells:
“As a network of scientists and academics, we provide independent, expert-reviewed information and road-tested educational resources on stem cells and their impact on society. We also work with people affected by conditions, educators, regulators, media, healthcare professionals and policymakers to foster engagement and develop material that meets their needs.”
True to their word they have great information on the latest research, broken down by different types of disease, different types of stem cell etc. And like CIRM they also have some great educational resources for teachers to use in the classroom.
Following the race to develop a vaccine for COVID-19 has been a crash course in learning how complicated creating a new therapy is. It’s not just the science involved, but the logistics. Coming up with a vaccine that is both safe and effective is difficult enough, but then how do you make enough doses of it to treat hundreds of millions of people around the world?
That’s a familiar problem for stem cell researchers. As they develop their products they are often able to make enough cells in their own labs. But as they move into clinical trials where they are testing those cells in more and more people, they need to find a new way to make more cells. And, of course, they need to plan ahead, hoping the therapy is approved by the Food and Drug Administration, so they will need to be able to manufacture enough doses to meet the increased demand.
We saw proof of that planning ahead this week with the news that Cedars-Sinai Medical Center in Los Angeles has opened up a new Biomanufacturing Center.
Dr. Clive Svendsen, executive director of the Cedars-Sinai Board of Governors Regenerative Medicine Institute, said in a news release, the Center will manufacture the next generation of drugs and regenerative medicine therapies.
“The Cedars-Sinai Biomanufacturing Center leverages our world-class stem-cell expertise, which already serves scores of clients, to provide a much-needed biomanufacturing facility in Southern California. It is revolutionary by virtue of elevating regenerative medicine and its therapeutic possibilities to an entirely new level-repairing the human body.”
This is no ordinary manufacturing plant. The Center features nine “clean rooms” that are kept free from dust and other contaminants. Everyone working there has to wear protective suits and masks to ensure they don’t bring anything into the clean rooms.
The Center will specialize in manufacturing induced pluripotent stem cells, or iPSCs. Dhruv Sareen, PhD, executive director of the Biolmanufacturing Center, says iPSCs are cells that can be turned into any other kind of cell in the body.
“IPSCs are powerful tools for understanding human disease and developing therapies. These cells enable us to truly practice precision medicine by developing drug treatments tailored to the individual patient or groups of patients with similar genetic profiles.”
The Biomanufacturing Center is designed to address a critical bottleneck in bringing cell- and gene-based therapies to the clinic. After all, developing a therapy is great, but it’s only half the job. Making enough of it to help the people who need it is the other half.
When you have a great story to tell there’s no shame in repeating it as often as you can. After all, not everyone gets to hear first time around. Or second or third time. So that’s why we wanted to give you another opportunity to tune into some of the great presentations and discussions at our recent CIRM Alpha Stem Cell Clinic Network Symposium.
It was a day of fascinating science, heart-warming, and heart-breaking, stories. A day to celebrate the progress being made and to discuss the challenges that still lie ahead.
There is a wide selection of topics from “Driving Towards a Cure” – which looks at some pioneering work being done in research targeting type 1 diabetes and HIV/AIDS – to Cancer Clinical Trials, that looks at therapies for multiple myeloma, brain cancer and leukemia.
The COVID-19 pandemic also proved the background for two detailed discussions on our funding for projects targeting the coronavirus, and for how the lessons learned from the pandemic can help us be more responsive to the needs of underserved communities.
Here’s the agenda for the day and with each topic there’s a link to the video of the presentation and conversation.
At CIRM we are modest enough to know that we can’t do everything by ourselves. To succeed we need partners. And in UC Davis we have a terrific partner. The work they do in advancing stem cell research is exciting and really promising. But it’s not just the science that makes them so special. It’s also their compassion and commitment to caring for patients.
What follows is an excerpt from an article by Lisa Howard on the work they do at UC Davis. When you read it you’ll see why we are honored to be a part of this research.
Gene therapy research at UC Davis
UC Davis’ commitment to stem cell and gene therapy research dates back more than a decade.
In 2010, with major support from the California Institute for Regenerative Medicine (CIRM), UC Davis launched the UC Davis Institute for Regenerative Cures, which includes research facilities as well as a Good Manufacturing Practice (GMP) facility.
Led by Jan Nolta, a professor of cell biology and human anatomy and the director of the UC Davis Institute for Regenerative Cures, the new center leverages UC Davis’ network of expert researchers, facilities and equipment to establish a center of excellence aimed at developing lifelong cures for diseases.
Nolta began her career at the University of Southern California working with Donald B. Kohn on a cure for bubble baby disease, a condition in which babies are born without an immune system. The blood stem cell gene therapy has cured more than 50 babies to date.
Work at the UC Davis Gene Therapy Center targets disorders that potentially can be treated through gene replacement, editing or augmentation.
“The sectors that make up the core of our center stretch out across campus,” said Nolta. “We work with the MIND Institute a lot. We work with the bioengineering and genetics departments, and with the Cancer Center and the Center for Precision Medicine and Data Sciences.”
A recent UC Davis stem cell study shows a potential breakthrough for healing diabetic foot ulcers with a bioengineered scaffold made up of human mesenchymal stem cells (MSCs). Another recent study revealed that blocking an enzyme linked with inflammation enables stem cells to repair damaged heart tissue. A cell gene therapy study demonstrated restored enzyme activity in Tay-Sachs disease affected cells in humanized mouse models.
“Some promising and exciting research right now at the Gene Therapy Center comes from work with hematopoietic stem cells and with viral vector delivery,” said Nolta.
Hematopoietic stem cells give rise to other blood cells. A multi-institutional Phase I clinical trial using hematopoietic stem cells to treat HIV-lymphoma patients is currently underway at UC Davis.
“We are genetically engineering a patient’s own blood stem cells with genes that block HIV infection,” said Joseph Anderson, an associate professor in the UC Davis Department of Internal Medicine. The clinical trial is a collaboration with Mehrdad Abedi, the lead principal investigator.
“When the patients receive the modified stem cells, any new immune system cell, like T-cell or macrophage, that is derived from one of these stem cells, will contain the HIV-resistant genes and block further infection,” said Anderson.
He explained that an added benefit with the unique therapy is that it contains an additional gene that “tags” the stem cells. “We are able to purify the HIV-resistant cells prior to transplantation, thus enriching for a more protective cell population.
Kyle David Fink
Kyle David Fink, an assistant professor of neurology at UC Davis, is affiliated with the Stem Cell Program and Institute for Regenerative Cures. His lab is focused on leveraging institutional expertise to bring curative therapies to rare, genetically linked neurological disorders.
“We are developing novel therapeutics targeted to the underlying genetic condition for diseases such as CDKL5 deficiency disorder, Angelman, Jordan and Rett syndromes, and Juvenile Huntington’s disease,” said Fink.
The lab is developing therapies to target the underlying genetic condition using DNA-binding domains to modify gene expression in therapeutically relevant ways. They are also creating novel delivery platforms to allow these therapeutics to reach their intended target: the brain.
“The hope is that these highly innovative methods will speed up the progress of bringing therapies to these rare neurodegenerative disease communities,” said Fink.
Jasmine Carter, a graduate research assistant at the UC Davis Stem Cell Program, October 18, 2019. (AJ Cheline/UC Davis)
Developing potential lifetime cures
Among Nolta’s concerns is how expensive gene therapy treatments can be.
“Some of the therapies cost half a million dollars and that’s simply not available to everyone. If you are someone with no insurance or someone on Medicare, which reimburses about 65 percent, it’s harder for you to get these life-saving therapies,” said Nolta.
To help address that for cancer patients at UC Davis, Nolta has set up a team known as the “CAR T Team.”
Chimeric antigen receptor (CAR) T-cell therapy is a type of immunotherapy in which a patient’s own immune cells are reprogrammed to attack a specific protein found in cancer cells.
“We can develop our own homegrown CAR T-cells,” said Nolta. “We can use our own good manufacturing facility to genetically engineer treatments specifically for our UC Davis patients.”
Although safely developing stem cell treatments can be painfully slow for patients and their families hoping for cures, Nolta sees progress every day. She envisions a time when gene therapy treatments are no longer considered experimental and doctors will simply be able to prescribe them to their patients.
“And the beauty of the therapy is that it can work for the lifetime of a patient,” said Nolta.
Over 650,000 Americans suffer from end-stage kidney disease – a life-threatening condition caused by the loss of kidney function. The best available treatment for these patients is a kidney transplant from a genetically matched living donor. However, patients who receive a transplant must take life-long immunosuppressive drugs to prevent their immune system from rejecting the transplanted organ. Over time, these drugs are toxic and can increase a patient’s risk of infection, heart disease, cancer and diabetes. Despite these drugs, many patients still lose transplanted organs due to rejection.
To tackle this problem Medeor is developing a stem cell-based therapy called MDR-101. This is being tested in a Phase 3 clinical trial and it’s hoped it will eliminate the need for immunosuppressive drugs in genetically matched kidney transplant patients.
The company takes blood-forming stem cells and immune cells from the organ donor and infuses them into the patient receiving the donor’s kidney. Introducing the donor’s immune cells into the patient creates a condition called “mixed chimerism” where immune cells from the patient and the donor are able to co-exist. In this way, the patient’s immune system is able to adapt to and tolerate the donor’s kidney, potentially eliminating the need for the immunosuppressive drugs that are normally necessary to prevent transplant rejection.
So how does getting RMAT designation help that? Well, the FDA created the RMAT program to help speed up the development and review of regenerative medicine therapies that can treat, modify, reverse, or cure a serious condition. If MDR-101shows it is both safe and effective RMAT could help it get faster approval for wider use.
In a news release Giovanni Ferrara, President and CEO of Medeor, welcomed the news.
“This important designation underscores the tremendous unmet medical need for alternatives to today’s immunosuppressive therapies for transplantation. We have the potential to help people live longer, healthier lives without the need for high dose and chronic immunosuppression and we thank the FDA for this designation that will assist us progressing as efficiently as possible toward a commercially available product.”
Single-cell. It is the new buzzword in biology. Single-cell biology refers to the in-depth characterization of individual cells in an organ or similar microenvironment. Every organ, like the brain or heart, is composed of thousands to millions of cells. Single-cell biology breaks those organs down into their individual cell components to study the diversity within those cells. For example, the heart is composed of cardiomyocytes, but within that bulk population of cardiomyocytes there are specialized cardiomyocytes for the different chambers of the heart and others that control beating, plus others not even known yet. Single-cell studies characterize cell-to-cell variability in the body down to this level of detail to gain knowledge of tissues in a way that was not possible before.
The majority of single-cell studies are based on next generation sequencing technologies of genetic material such as DNA or RNA. The cost of sequencing each base of DNA or RNA has dropped precipitously since the first human genome was published in 2000, often compared to the trend seen with Moore’s Law in computing. As a result it is now possible to sequence every gene that is expressed in an individual cell, called the transcriptome, for thousands and thousands of cells.
The explosion of data coming from these technologies requires new approaches to study and analyze the information. The scale of the genetic sequences that can be generated is so big that it is often not possible anymore for scientists to interpret the data manually as had been traditionally done. To apply this exciting field to stem cell research and therapies, CIRM funded the Genomics Initiative which created the Centers of Excellence in Stem Cell Genomics (CESCG). The goal of the CESCG is to create novel genomic information and create new bioinformatics tools (i.e. computer software) specifically for stem cell research, some of which was highlighted in past blogs. Some of the earliest single-cell gene expression atlases of the human body were created under the CESCG.
The latest study from CESCG investigators creates both new information and new tools for single-cell genomics. In work funded by the Genomics Initiative, Stephen Quake and colleagues at Stanford University and the Chan-Zuckerberg Biohub studied tumor formation using single-cell approaches. Drawing from one of the earliest published single-cell studies, the team had surveyed human brain transcriptome diversity that included samples from the brain cancer, glioblastoma.
Recognizing that the data coming from these studies would eventually become too large and numerous to classify all of the cell types by hand, they created a new bioinformatics tool called Northstar to apply artificial intelligence to automatically classify cell types generated by single-cell studies. The cell classifications generated by Northstar were similar to the original classifications created manually several years ago including the identification of specific cancerous cells.
Some of the features that make Northstar a powerful bioinformatics tool for these studies are that the software is scalable for large numbers of cells, it performs the computations to classify cells very fast, and it requires relatively low computer processing power to go through literally millions of data points.
The scalability of the tool was demonstrated on the Tabula Muris data collection, a single-cell compendium of 20 mouse organs with over 200,000 cells of data. Finally, Northstar was used to classify the tumors from new single-cell data generated by the CESCG via samples of 11 patient pancreatic cancer patients obtained from Stanford Hospital. Northstar correctly found the origins of cancerous cells from the specific diagnoses of pancreatic cancer that the patients had, for example cancerous cells in the endocrine cell lineage from a patient diagnosed with neuroendocrine pancreas cancer. Furthermore, Northstar identified previously unknown origins of cancerous cell clusters from other patients with pancreatic cancer. These new computational tools demonstrate how big data from genomic studies can become important contributors to personalized medicine.
One of our favorite things to do at CIRM is deliver exciting news about CIRM projects. This usually entails discussion of recent discoveries that made headlines, or announcing the launch of a new CIRM-funded clinical trial …. tangible signs of progress towards addressing unmet medical needs through advances in stem technology.
But there are equally exciting signs of progress that are not always so obvious to the untrained eye- those that we are privileged to witness behind the scenes at CIRM. These efforts don’t always lead to a splashy news article or even to a scientific publication, but they nonetheless drive the evolution of new ideas and can help steer the field away from futile lines of investigation. Dozens of such projects are navigating uncharted waters by filling knowledge gaps, breaking down technical barriers, and working closely with regulatory agencies to define novel and safe paths to the clinic.
These efforts can remain “hidden” because they are in the intermediate stages of the long, arduous and expensive journey from “bench to beside”. For the pioneering projects that CIRM funds, this journey is unique and untrod, and can be fraught with false starts. But CIRM has developed tools to track the momentum of these programs and provide continuous support for those with the most promise. In so doing, we have watched projects evolve as they wend their way to the clinic. We wanted to share a few examples of how we do this with our readers, but first… a little background for our friends who are unfamiliar with the nuts and bolts of inventing new medicines.
A common metaphor for bringing scientific discoveries to market is a pipeline, which begins in a laboratory where a discovery occurs, and ends with government approval to commercialize a new medicine, after it is proven to be safe and effective. In between discovery and approval is a stage called “Translation”, where investigators develop ways to transition their “research level” processes to “clinically compatible” ones, which only utilize substances that are of certified quality for human use.
Investigators must also work out novel ways to manufacture the product at larger scale and transition the methods used for testing in animal models to those that can be implemented in human subjects.
A key milestone in Translation is the “preIND” (pre Investigational New Drug (IND) meeting, where an investigator presents data and plans to the US Food and Drug Administration (FDA) for feedback before next stage of development begins, the pivotal testing needed to show it is both safe and effective.
These “IND enabling studies” are rigorous but necessary to support an application for an IND and the initiation of clinical trials, beginning with phase 1 to assess safety in a small number of individuals, and phase 2, where an expanded group is evaluated to see if the therapy has any benefits for the patient. Phase 3 trials are studies of very large numbers of individuals to gain definitive evidence of safety and therapeutic effect, generally the last step before applying to the FDA for market approval. An image of the pipeline and the stages described are provided in our diagram below.
The pipeline can be notoriously long and tricky, with plenty of twists, turns, and unexpected obstacles along the way. Many more projects enter than emerge from this gauntlet, but as we see from these examples of ‘works in progress”, there is a lot of momentum building.
Caption for Graphic:This graphic shows the number of CIRM-funded projects and the stages they have progressed through multiple rounds of CIRM funding. For example, the topmost arrow shows that are about 19 projects at the translational stage of the pipeline that received earlier support through one of CIRM’s Discovery stage programs. Many of these efforts came out of our pre-2016 funding initiatives such as Early Translation, Basic Biology and New Faculty Awards. In another example, you can see that about 15 awards that were first funded by CIRM at the IND enabling stage have since progressed into a phase 1 or phase 2 clinical trials. While most of these efforts also originated in some of CIRM’s pre-2016 initiatives such as the Disease Team Awards, others have already progressed from CIRM’s newer programs that were launched as part of the “2.0” overhaul in 2016 (CLIN1).
The number of CIRM projects that have evolved and made their way down the pipeline with CIRM support is impressive, but it is clearly an under-representation, as there are other projects that have progressed outside of CIRM’s purview, which can make things trickier to verify.
We also track projects that have spun off or been licensed to commercial organizations, another very exciting form of “progression”. Perhaps those will contribute to another blog for another day! In the meantime, here are a just a few examples of some of the progressors that are depicted on the graphic.
Project: stem cell therapy to enhance bone healing in theelderly
– Currently funded stage: IND enabling development, CLIN1-11256 (Dr. Zhu, Ankasa Regenerative Therapeutics)
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.
Don’t you love it when someone does your job for you and does it so well you have no need to add anything to it! Doesn’t happen very often – sad to say – but this week our friends at UCLA wrote a great article describing the work they are doing to target COVID-19. Best of all, all the work described is funded by CIRM. So read, and enjoy.
Two scientists in a lab at the UCLA Broad Stem Cell Research Center
By Tiare Dunlap, UCLA
As the COVID-19 pandemic rages on, UCLA researchers are rising to the occasion by channeling their specialized expertise to seek new and creative ways to reduce the spread of the virus and save lives. Using years’ — or even decades’ — worth of knowledge they’ve acquired studying other diseases and biological processes, many of them have shifted their focus to the novel coronavirus, and they’re collaborating across disciplines as they work toward new diagnostic tests, treatments and vaccines.
“As a result of the pandemic, everyone on campus is committed to finding ways that their unique expertise can help out,” said Dr. Brigitte Gomperts, professor and vice chair of research in pediatric hematology-oncology and pulmonary medicine at the David Geffen School of Medicine at UCLA and a member of the UCLA Children’s Discovery and Innovation Institute. “So many of my colleagues have repurposed their labs to work on the virus. It’s very seldom that you have one thing that everybody’s working on, and it has been truly inspiring to see how everyone has come together to try and solve this.”
Here’s a look at five projects in which UCLA scientists are using stem cells — which can self-replicate and give rise to all cell types — to take on COVID-19.
Using lung organoids as models to test possible treatments
Dr. Brigitte Gomperts
Gomperts has spent years perfecting methods for creating stem cell–derived three-dimensional lung organoids. Now, she’s using those organoids to study how SARS-CoV-2, the virus that causes COVID-19, affects lung tissue and to rapidly screen thousands of prospective treatments. Because the organoids are grown from human cells and reflect the cell types and architecture of the lungs, they can offer unprecedented insights into how the virus infects and damages the organ.
Gomperts is collaborating with UCLA colleagues Vaithilingaraja Arumugaswami, a virologist, and Robert Damoiseaux, an expert in molecular screening. Their goal is to find an existing therapy that could be used to reduce the spread of infection and associated damage in the lungs.
“We’re starting with drugs that have already been tested in humans because our goal is to find a therapy that can treat patients with COVID-19 as soon as possible,” Gomperts said. Read more.
Repurposing a cancer therapy
Vaithilingaraja Arumugaswami, associate professor of molecular and medical pharmacology at the Geffen School of Medicine
In addition to collaborating with Gomperts, Arumugaswami and Damoiseaux identified the cancer drug Berzosertib as a possible treatment for COVID-19 after screening 430 drug candidates. The drug, which is currently being tested in clinical trials for cancer, works by blocking a DNA repair process that is exploited by solid cancers and the SARS-CoV-2 virus, and the UCLA scientists found that it is very effective at limiting viral replication and cell death.
“Clinical trials have shown that Berzosertib blocks the DNA repair pathway in cancer cells, but has no effects on normal, healthy cells,” Arumugaswami said.
Now, Arumugaswami and Gustavo Garcia Jr., a staff research associate, are testing Berzosertib and additional drug combinations on lung organoids developed in Gomperts’ lab and stem cell–derived heart cells infected with SARS-CoV-2. They suspect that if the drug is administered soon after diagnosis, it could limit the spread of infection and prevent complications. Read more.
Studying the immune response to the virus
Dr. Gay Crooks, professor of pathology and laboratory medicine and of pediatrics at the Geffen School of Medicine, and co-director of the Broad Stem Cell Research Center; and Dr. Christopher Seet,
assistant professor of hematology-oncology at the Geffen School of Medicine
Crooks and Seet are using stem cells to model how immune cells recognize and fight the virus in a lab dish. To do that, they’re infecting blood-forming stem cells — which can give rise to all blood and immune cells — from healthy donors with parts of the SARS-CoV-2 virus and then coaxing the stem cells to produce immune cells called dendritic cells. Dendritic cells devour viral proteins, chop them up into pieces and then present those pieces to other immune cells called T cells to provoke a response.
By studying that process, Crooks and Seet hope to identify which parts of the virus provoke the strongest T-cell responses. Developing an effective vaccine for SARS-CoV-2 will require a deep understanding of how the immune system responds to the virus, and this work could be an important step in that direction, giving researchers and clinicians a way to gauge the effectiveness of possible vaccines.
“When we started developing this project some years ago, we had no idea it would be so useful for studying a viral infection — any viral infection,” Crooks said. “It was only because we already had these tools in place that we could spring into action so fast.” Read more.
Developing a booster that could help a vaccine last longer
A COVID-19 vaccine will need to provide long-term protection from infection. But how long a vaccine protects from infection isn’t solely dependent on the vaccine.
The human body relies on long-living immune cells called T memory stem cells that guard against pathogens such as viruses and bacteria that the body has encountered before. Unfortunately, the body’s capacity to form T memory stem cells decreases with age. So no matter how well designed a vaccine is, older adults who don’t have enough of a response from T memory stem cells will not be protected long-term.
To address that issue, Li is developing an injectable biomaterial vaccine booster that will stimulate the formation of T memory stem cells. The booster is made up of engineered materials that release chemical messengers to stimulate the production of T memory stem cells. When combined with an eventual SARS-CoV-2 vaccine, they would prompt the body to produce immune cells primed to recognize and eliminate the virus over the long term.
“I consider it my responsibility as a scientist and an engineer to translate scientific findings into applications to help people and the community,” Li said. Read more.
Invariant natural killer T cells, or iNKT cells, are the special forces of the immune system. They’re extremely powerful and can immediately recognize and respond to many different intruders, from infections to cancer.
Yang is testing whether iNKT cells would make a particularly effective treatment for COVID-19 because they have the capacity to kill virally infected cells, offer protection from reinfection and rein in the excessive inflammation caused by a hyperactive immune response to the virus, which is thought to be a major cause of tissue damage and death in people with the disease.
One catch, though, is that iNKT cells are incredibly scarce: One drop of human blood contains around 10 million blood cells but only around 10 iNKT cells. That’s where Yang’s research comes in. Over the past several years, she has developed a method for generating large numbers of iNKT cells from blood-forming stem cells. While that work was aimed at creating a treatment for cancer, Yang’s lab has adapted its work over the past few months to test how effective stem cell–derived iNKT cells could be in fighting COVID-19. With her colleagues, she has been studying how the cells work in fighting the disease in models of SARS-CoV-2 infection that are grown from human kidney and lung cells.
“My lab has been developing an iNKT cell therapy for cancer for years,” Yang said. “This means a big part of the work is already done. We are repurposing a potential therapy that is very far along in development to treat COVID-19.” Read more.
“Our center is proud to join CIRM in supporting these researchers as they adapt projects that have spent years in development to meet the urgent need for therapies and vaccines for COVID-19,” said Dr. Owen Witte, founding director of the UCLA Broad Stem Cell Research Center. “This moment highlights the importance of funding scientific research so that we may have the foundational knowledge to meet new challenges as they arise.” Crooks, Gomperts, Seet and Yang are all members of the UCLA Jonsson Comprehensive Cancer Center. Damoiseaux is a professor of molecular and medical pharmacology and director of the Molecular Shared Resource Center at the California NanoSystems Institute at UCLA