A new study that used adult blood stem cells to create replacement brain nerve cells appears to help rats with Parkinson’s.
In Parkinson’s, the disease attacks brain nerve cells that produce a chemical called dopamine. The lack of dopamine produces a variety of symptoms including physical tremors, depression, anxiety, insomnia and memory problems. There is no cure and while there are some effective treatments they tend to wear off over time.
In this study, researchers at Arizona State University took blood cells from humans and, using the iPSC method, changed those into dopamine-producing neurons. They then cultured those cells in the lab before implanting them in the brains of rats which had Parkinson’s-like symptoms.
They found that rats given cells that had been cultured in the lab for 17 days survived in greater numbers and seemed to be better at growing new connections in their brains, compared to rats given cells that had been cultured for 24 or 37 days.
In addition, those rats given larger doses of the cells experienced a complete reversal of their symptoms, compared to rats given smaller doses.
In a news release, study co-author Dr. Jeffrey Kordower, said: “We cannot be more excited by the opportunity to help individuals who suffer from [a] genetic form of Parkinson’s disease, but the lessons learned from this trial will also directly impact patients who suffer from sporadic, or non-genetic forms of this disease.”
The study, published in the journal npj Regenerative Medicine, says this approach might also help people suffering from other neurological diseases like Alzheimer’s or Huntington’s disease.
California researchers from UCLA and colleagues have created a first-of-its-kind roadmap that traces each step in the development of blood stem cells in the human embryo, providing scientists with a blueprint for producing fully functional blood stem cells in the lab.
The research, published in the journal Nature, could help expand treatment options for blood cancers like leukemia and inherited blood disorders such as sickle cell disease, said UCLA’s Dr. Hanna Mikkola, who led the study.
Blood stem cells, also called hematopoietic stem cells, can make unlimited copies of themselves and differentiate into every type of blood cell in the human body. For decades, doctors have used blood stem cells from the bone marrow of donors and the umbilical cords of newborns in life-saving transplant treatments for blood and immune diseases.
However, these treatments are limited by a shortage of matched donors and hampered by the low number of stem cells in cord blood.
Researchers have long sought to create blood stem cells in the lab from human pluripotent stem cells, which can potentially give rise to any cell type in the body. But success has been elusive, in part because scientists have lacked the instructions to make lab-grown cells become self-renewing blood stem cells rather than short-lived blood progenitor cells, which can only produce limited blood cell types.
“Nobody has succeeded in making functional blood stem cells from human pluripotent stem cells because we didn’t know enough about the cell we were trying to generate,” said Mikkola.
A New Roadmap
The new roadmap will help researchers understand the fundamental differences between the two cell types, which is critical for creating cells that are suitable for use in transplantation therapies, said UCLA scientist Vincenzo Calvanese, a co–first author of the research, along with UCLA’s Sandra Capellera-Garcia and Feiyang Ma.
“We now have a manual of how hematopoietic stem cells are made in the embryo and how they acquire the unique properties that make them useful for patients,” said Calvanese, who is also a group leader at University College London.
The research team created the resource using new technologies that enable scientists to identify the unique genetic networks and functions of thousands of individual cells and to reveal the location of these cells in the embryo.
The data make it possible to follow blood stem cells as they emerge and migrate through various locations during their development, starting from the aorta and ultimately arriving in the bone marrow. Importantly, the map unveils specific milestones in their maturation process, including their arrival in the liver, where they acquire the special abilities of blood stem cells.
The research group also pinpointed the exact precursor in the blood vessel wall that gives rise to blood stem cells. This discovery clarifies a longstanding controversy about the stem cells’ cellular origin and the environment that is needed to make a blood stem cell rather than a blood progenitor cell.
Through these insights into the different phases of human blood stem cell development, scientists can see how close they are to making a transplantable blood stem cell in the lab.
A Better Understanding of Blood Cancers
In addition, the map can help scientists understand how blood-forming cells that develop in the embryo contribute to human disease. For example, it provides the foundation for studying why some blood cancers that begin in utero are more aggressive than those that occur after birth.
“Now that we’ve created an online resource that scientists around the world can use to guide their research, the real work is starting,” Mikkola said. “It’s a really exciting time to be in the field because we’re finally going to be seeing the fruits of our labor.”
Virtual reality may soon be used to treat cancer patients who are recovering from stem cell procedures.
Healthcare technology company Rocket VR Health—in partnership with Massachusetts General Hospital—is developing a virtual reality (VR) therapy that intends to enhance the quality of life of cancer patients who receive stem cell transplants.
Specifically, the therapy is intended to help with distress management in blood cancer patients undergoing blood stem cell transplantation (HCT) in an in-clinic setting. HCT (short for hematopoietic cell transplantation) can be used to treat certain types of cancer, such as leukemia, myeloma, and lymphoma, and other blood and immune system diseases that affect the bone marrow.
The average hospital length of stay for patients with hematologic malignancies—cancers that start in blood forming tissues such as bone marrow—who undergo HCT is typically 28 days. During the hospitalization period, patients can’t leave their rooms as their immune system is weakened while their bone marrow is re-generated.
As contact with the outside world is limited during recovery, patients may endure significant short-term and long-term distress that affects their physical and psychological well-being.
The treatment being developed consists of psychoeducation, therapy, and relaxation exercises in a VR environment designed to be self-administered by patients. The immersive environment aims to give patients access to the outside world virtually while being confined to their hospital room.
It is reported that patients who receive integrated psychological interventions during their hospital stays have fewer depression and PTSD symptoms than those who receive standard transplant care alone.
Rocket VR Health hopes to create a therapy that hospitals and health systems can offer to patients using clinically validated therapies over fully-immersive virtual reality to make psychosocial care more accessible and effective.
When Hataalii Begay was born in a remote part of the Navajo nation he was diagnosed with a rare, usually fatal condition. Today, thanks to a therapy developed at UCSF and funded by CIRM, he’s a normal healthy four year old boy running around in cowboy boots.
That stem cell therapy could now help save the lives of other children born with this deadly immune disorder because it has been granted fast-track review status by the US Food and Drug Administration (FDA).
The disorder is Artemis-SCID, a form of severe combined immunodeficiency disease. Children born with this condition have no functioning immune system so even a simple infection can prove life-threatening or fatal.
Currently, the only approved treatment for Artemis-SCID is a bone-marrow transplant, but many children are unable to find a healthy matched donor for that procedure. Even when they do find a donor they often need regular injections of immunoglobulin to boost their immune system.
In this clinical trial, UCSF Doctors Mort Cowan and Jennifer Puck are using the patient’s own blood stem cells, taken from their bone marrow. In the lab, the cells are modified to correct the genetic mutation that causes Artemis-SCID and then re-infused back into the patients. The goal is that over the course of several months these cells will create a new blood supply, one that is free of Artemis-SCID, and that will in turn help repair the child’s immune system.
So far the team has treated ten newly-diagnosed infants and three older children who failed transplants. Dr. Cowan says early data from the trial is encouraging. “With gene therapy, we are seeing these babies getting older. They have normal T-cell immunity and are getting immunized and vaccinated. You wouldn’t know they had any sort of condition if you met them; it’s very heartening.”
Because of that encouraging data, the FDA is granting this approach Regenerative Medicine Advanced Therapy (RMAT) designation. RMAT is a fast-track designation that can help speed up the development, review and potential approval of treatments for serious or life-threatening diseases.
“This is great news for the team at UCSF and in particular for the children and families affected by Artemis-SCID,” says Dr. Maria T. Millan, the President and CEO of CIRM. “The RMAT designation means that innovative forms of cell and gene therapies like this one may be able to accelerate their route to full approval by the FDA and be available to all the patients who need it.”
A recent discovery by stem cell scientists at Cedars-Sinai may help make cancer treatment more efficient and shorten the time it takes for people to recover from radiation and chemotherapy.
Published in the journal Nature Communications, the study by Dr. John Chute and his team (and co-funded by CIRM) revealed a mechanism through which the blood vessels in the bone marrow respond to injury, such as from chemotherapy or radiation.
When people receive radiation or chemotherapy as part of their cancer treatment, their blood counts plummet. It typically takes several weeks for these counts to return to normal levels. During this period patients are at risk for developing infections that may lead to hospitalization, disruptions in chemotherapy schedules, and even death.
Chute and his colleagues found that when mice receive radiation treatment, the cells that line the inner walls of the blood vessels in the bone marrow produce a protein called semaphorin 3A. This protein tells another protein, called neuropilin 1, to kill damaged blood vessels in the bone marrow.
When the investigators blocked the ability of these blood vessel cells to produce neuropilin 1 or semaphorin 3A, or injected an antibody that blocks semaphorin 3A communication with neuropilin 1, the veins and arteries in the bone marrow regenerated faster following irradiation. In addition, blood counts increased dramatically after one week.
“We’ve discovered a mechanism that appears to control how blood vessels regenerate following injury,” said Chute, senior author of the paper. “Inhibiting this mechanism causes rapid recovery of the blood vessels and blood cells in bone marrow following chemotherapy or irradiation.”
In principle, Chute said, targeting this mechanism could allow patients to recover following chemotherapy in one to two weeks, instead of three or four weeks as currently experienced.
Christina M. Termini, a post-doctoral scientist at the David Geffen School of Medicine at UCLA, was the first author of this study. Read the source press release here.
In our recently launched 5-year Strategic Plan, the California Institute for Regenerative Medicine (CIRM) profiled two researchers who have leveraged CIRM funding to translate basic biological discoveries into potential real-world solutions for devastating diseases.
Dr. Joseph Wu is director of the Stanford Cardiovascular Institute and the recipient of several CIRM awards. Eleven of them to be exact! Over the past 10 years, Dr. Wu’s lab has extensively studied the application of induced pluripotent stem cells (iPSCs) for cardiovascular disease modeling, drug discovery, and regenerative medicine.
Dr. Wu’s extensive studies and findings have even led to a cancer vaccine technology that is now being developed by Khloris Biosciences, a biotechnology company spun out by his lab.
Through CIRM funding, Dr. Wu has developed a process to produce cardiomyocytes (cardiac muscle cells) derived from human embryonic stem cells for clinical use and in partnership with the agency. Dr. Wu is also the principal investigator in the first-in-US clinical trial for treating ischemic heart disease. His other CIRM-funded work has also led to the development of cardiomyocytes derived from human induced pluripotent stem cells for potential use as a patch.
Over at UCLA, Dr. Lili Yang and her lab team have generated invariant Natural Killer T cells (iNKT), a special kind of immune system cell with unique features that can more effectively attack tumor cells.
More recently, using stem cells from donor cord-blood and peripheral blood samples, Dr. Yang and her team of researchers were able to produce up to 300,000 doses of hematopoietic stem cell-engineered iNKT (HSC–iNKT) cells. The hope is that this new therapy could dramatically reduce the cost of producing immune cell products in the future.
Additionally, Dr. Yang and her team have used iNKT cells to develop both autologous (using the patient’s own cells), and off-the-shelf anti-cancer therapeutics (using donor cells), designed to target blood cell cancers.
The success of her work has led to the creation of a start-up company called Appia Bio. In collaboration with Kite Pharma, Appia Bio is planning on developing and commercializing the promising technology.
CIRM has been an avid supporter of Dr. Yang and Dr. Wu’s research because they pave the way for development of next-generation therapies. Through our new Strategic Plan, CIRM will continue to fund innovative research like theirs to accelerate world class science to deliver transformative regenerative medicine treatments in an equitable manner to a diverse California and the world.
Immunotherapy is a type of cancer treatment that uses a person’s own immune system to fight cancer. It comes in a variety of forms including targeted antibodies, cancer vaccines, and adoptive cell therapies. While immunotherapies have revolutionized the treatment of aggressive cancers in recent decades, they must be created on a patient-specific basis and as a result can be time consuming to manufacture/process and incredibly costly to patients already bearing the incalculable human cost of suffering from the cruelest disease.
Fortunately, the rapid progress that has led to the present era of cancer immunotherapy is expected to continue as scientists look for ways to improve efficacy and reduce cost. Just this week, a CIRM-funded study published in Cell Reports Medicine revealed a critical step forward in the development of an “off-the-shelf” cancer immunotherapy by researchers at UCLA. “We want cell therapies that can be mass-produced, frozen and shipped to hospitals around the world,” explains Lili Yang, the study’s senior author.
In order to fulfil this ambitious goal, Yang and her colleagues developed a new method for producing large numbers of a specialized T cell known as invariant natural killer T (iNKT) cells. iNKT cells are rare but powerful immune cells that don’t carry the risk of graft-versus-host disease, which occurs when transplanted cells attack a recipient’s body, making them better suited to treat a wide range of patients with various cancers.
Using stem cells from donor cord-blood and peripheral blood samples, the team of researchers discovered that one cord blood donation could produce up to 5,000 doses of the therapy and one peripheral blood donation could produce up to 300,000 doses. The high yield of the resulting cells, called hematopoietic stem cell-engineered iNKT (HSC–iNKT) cells,could dramatically reduce the cost of producing immune cell products in the future.
In order to test the efficacy of the HSC–iNKT cells, researchers conducted two very important tests. First, they compared its cancer fighting abilities to another set of immune cells called natural killer cells. The results were promising. The HSC–iNKT cells were significantly better at killing several types of tumor cells such as leukemia, melanoma, and lung cancer. Then, the HSC–iNKT cells were frozen and thawed, just as they would be if they were to one day become an off-the-shelf cell therapy. Researchers were once again delighted when they discovered that the HSC–iNKT cells sustained their tumor-killing efficacy.
Next, Yang and her team added a chimeric antigen receptor (CAR) to the HSC–iNKT cells. CAR is a specialized molecule that can enable immune cells to recognize and kill a specific type of cancer. When tested in the lab, researchers found that CAR-equipped HSC–iNKT cells eliminated the specific cancerous tumors they were programmed to destroy.
This study was made possible in part by three grants from CIRM.
It’s always lovely to end the week on a bright note and that’s certainly the case this week, thanks to some encouraging news about CIRM-funded research targeting blood disorders that affect the immune system.
Stanford’s Dr. Rosa Bacchetta and her team learned that their proposed therapy for IPEX Syndrome had been given the go-ahead by the Food and Drug Administration (FDA) to test it in people in a Phase 1 clinical trial.
IPEX Syndrome (it’s more formal and tongue twisting name is Immune dysregulation Polyendocrinopathy Enteropathy X-linked syndrome) is a life-threatening disorder that affects children. It’s caused by a mutation in the FOXP3 gene. Immune cells called regulatory T Cells normally function to protect tissues from damage but in patients with IPEX syndrome, lack of functional Tregs render the body’s own tissues and organs to autoimmune attack that could be fatal in early childhood.
Current treatment options include a bone marrow transplant which is limited by available donors and graft versus host disease and immune suppressive drugs that are only partially effective. Dr. Rosa Bacchetta and her team at Stanford will use gene therapy to insert a normal version of the FOXP3 gene into the patient’s own T Cells to restore the normal function of regulatory T Cells.
This approach has already been accorded an orphan drug and rare pediatric disease designation by the FDA (we blogged about it last year)
Orphan drug designation is a special status given by the Food and Drug Administration (FDA) for potential treatments of rare diseases that affect fewer than 200,000 in the U.S. This type of status can significantly help advance treatments for rare diseases by providing financial incentives in the form of tax credits towards the cost of clinical trials and prescription drug user fee waivers.
Under the FDA’s rare pediatric disease designation program, the FDA may grant priority review to Dr. Bacchetta if this treatment eventually receives FDA approval. The FDA defines a rare pediatric disease as a serious or life-threatening disease in which the serious or life-threatening manifestations primarily affect individuals aged from birth to 18 years and affects fewer than 200,000 people in the U.S.
Congratulations to the team and we wish them luck as they begin the trial.
Someone who needs no introduction to regular readers of this blog is UCLA’s Dr. Don Kohn. A recent study in the New England Journal of Medicine highlighted how his work in developing a treatment for severe combined immune deficiency (SCID) has helped save the lives of dozens of children.
Now a new study in the journal Blood shows that those benefits are long-lasting, with 90% of patients who received the treatment eight to 11 years ago still disease-free.
In a news release Dr. Kohn said: “What we saw in the first few years was that this therapy worked, and now we’re able to say that it not only works, but it works for more than 10 years. We hope someday we’ll be able to say that these results last for 80 years.”
Ten children received the treatment between 2009 and 2012. Nine were babies or very young children, one was 15 years old at the time. That teenager was the only one who didn’t see their immune system restored. Dr. Kohn says this suggests that the therapy is most effective in younger children.
Dr. Kohn has since modified the approach his team uses and has seen even more impressive and, we hope, equally long-lasting results.
The second Wednesday in October is celebrated as Stem Cell Awareness Day. It’s an event that CIRM has been part of since then Governor Arnold Schwarzenegger launched it back in 2008 saying: ”The discoveries being made today in our Golden State will have a great impact on many around the world for generations to come.”
In the past we would have helped coordinate presentations by scientists in schools and participated in public events. COVID of course has changed all that. So, this year, to help mark the occasion we asked some people who have been in the forefront of making Governor Schwarzenegger’s statement come true, to share their thoughts and feelings about the day. Here’s what they had to say.
What do you think is the biggest achievement so far in stem cell research?
Jan Nolta, PhD., Director of the Stem Cell Program at UC Davis School of Medicine, and directs the new Institute for Regenerative Cures. “The work of Don Kohn and his UCLA colleagues and team members throughout the years- developing stem cell gene therapy cures for over 50 children with Bubble baby disease. I was very fortunate to work with Don for the first 15 years of my career and know that development of these cures was guided by his passion to help his patients.
When people ask you what kind of impact CIRM and stem cell research has had on your life what do you say?
Pawash Priyank and Upasana Thakur, parents of Ronnie,who was born with a life-threatening immune disorder but is thriving today thanks to a CIRM-funded clinical trial at UC San Francisco. “This is beyond just a few words and sentences but we will give it a shot. We are living happily today seeing Ronnie explore the world day by day, and this is only because of what CIRM does every day and what Stem cell research has done to humanity. Researchers and scientists come up with innovative ideas almost every day around the globe but unless those ideas are funded or brought to implementation in any manner, they are just in the minds of those researchers and would never be useful for humanity in any manner. CIRM has been that source to bring those ideas to the table, provide facilities and mechanisms to get those actually implemented which eventually makes babies like Ronnie survive and see the world. That’s the impact CIRM has. We have witnessed and heard several good arguments back in India in several forums which could make difference in the world in different sectors of lives but those ideas never come to light because of the lack of organizations like CIRM, lack of interest from people running the government. An organization like CIRM and the interest of the government to fund them with an interest in science and technology actually changes the lives of people when some of those ideas come to see the light of real implementation.
What are your biggest hopes for the future at UC Davis?
Jan Nolta, PhD: “The future of stem cell and gene therapy research is very bright at UC Davis, thanks to CIRM and our outstanding leadership. We currently have 48 clinical trials ongoing in this field, with over 20 in the pipeline, and are developing a new education and technology complex, Aggie Square, next to the Institute for Regenerative Cures, where our program is housed. We are committed to our very diverse patient population throughout the Sacramento region and Northern California, and to expanding and increasing the number of novel therapies that can be brought to all patients who need them.”
What are your biggest hopes for the future at Cedars-Sinai?
Clive Svendsen, PhD: “That young investigators will get CIRM or NIH funding and be leaders in the regenerative medicine field.”
What do you hope is the future for stem cell research?
Pawash Priyank and Upasana Thakur: “We always have felt good about stem cell therapy. For us, a stem cell has transformed our lives completely. The correction of sequencing in the DNA taken out of Ronnie and injecting back in him has given him life. It has given him the immune system to fight infections. Seeing him grow without fear of doing anything, or going anywhere gives us so much happiness every hour. That’s the impact of stem cell research. With right minds continuing to research further in stem cell therapy bounded by certain good processes & laws around (so that misuse of the therapy couldn’t be done) will certainly change the way treatments are done for certain incurable diseases. I certainly see a bright future for stem cell research.”
On a personal note what is the moment that touched you the most in this journey.
Jan Nolta, PhD: “Each day a new patient or their story touches my heart. They are our inspiration for working hard to bring new options to their care through cell and gene therapy.”
Clive Svendsen, PhD: “When I realized we would get the funding to try and treat ALS with stem cells”
How important is it to raise awareness about stem cell research and to educate the next generation about it?
Pawash Priyank and Upasana Thakur: “Implementing stem cell therapy as a curriculum in the educational systems right from the beginning of middle school and higher could prevent false propaganda of it through social media. Awareness among people with accurate articles right from the beginning of their education is really important. This will also encourage the new generation to choose this as a subject in their higher studies and contribute towards more research to bring more solutions for a variety of diseases popping up every day.”
As far as Aldo Pourchet is concerned you are never too young to learn about stem cells. Aldo should know. He’s a molecular and cellular biologist and the co-founder and CEO of Omios Bio, which develops immunotherapies for cancer, infectious and inflammatory diseases.
And now Aldo is the author of a children’s book about stem cells. The book is “Nano’s Journey! A Little Stem Cell Visits the Heart and Lungs.” It’s the story of Nano, a stem cell who doesn’t know what kind of cell she wants to be when she grows up, so she goes on a journey through the body, exploring all the different kinds of cell she could be.
It’s a really sweet book, beautifully illustrated, and written in a charming way to engage children between the ages of 5 and 8. I asked Aldo what made him want to write a book like this.
“I was interested in providing very general knowledge such as the principleof life, the basic logics of nature and at the same time to entertain. It wasvery important for it not to be a textbook.
“Why Stem cells? Because it is the most fascinating biology and they are at the origin of an organism and throughout its life play an essential role. They evolve and transform, so they have a story that unfolds. An analogy with children maybe. It’s easy to imagine children are like stem cells, trying to decide who they are, while adults are like differentiated cells because they have already decided.
“For the kids to appropriate the story, I thought that humanizing cells was important. I wanted children to identify themselves with the cells andespecially Nano, the little girl main character. It’s a book written for the children, in the first place. We tell the story at their level. Not try to bring them up to the level of life science.
Aldo says right from the start he had a clear idea of who he wanted the lead character to be.
“I think the world needs more female leaders, more female voices andinfluence in general and in every domain. So quite early it became naturalfor me that Nano would be a girl and also would have a strong character,curious and adventurous.
“Blasto came later because I was looking for a companion to share the adventure with Nano. Blasto is a fibroblast so he is not supposed to leave the Bone Marrow but fibroblasts are everywhere in our organism so I thought it was an acceptable stretch.
The drawings in the book are delightful, colorful and fun. Aldo says he had some ideas, rounded shapes for the cells for example and a simple design that reflected the fact that there are no lines in nature. Illustrator Jen Yoon took it from there:
“Based on Aldo’s direction and imagination, I envisioned the style like drawings on a chalkboard. Soft curves with rough textures. After that everything went smoothly. Following Nano’s journey with my iPad pencil, it felt like a boat ride at an amusement park.”
The books are written to be read aloud by parents, adults and teachers to kids. But, spoiler alert, we don’t find out what cell Nano decides to be in this book. She’s going to have more adventures in other books before she makes up her mind.