UC Davis researchers find a way to help stem cells work …
Posted: December 17, 2020 at 7:54 pm
Blocking an enzyme linked with inflammation makes it possible for stem cells to repair damaged heart tissue, new research from UC Davis Health scientists shows.
Researchers Phung Thai (left) and Padmini Sirish were part of a research team seeking stem cell solutions to heart failure care.
The enzyme soluble epoxide hydrolase, or sEH is a known factor in lung and joint disease. Now, it is a focus of heart-disease researchers as well.
The authors expect their work will lead to a new and powerful class of compounds that overcome the cell death and muscle thickening associated with heart failure a common outcome of a heart attack or long-term cardiovascular disease.
The study, conducted in mice, is published in Stem Cells Translational Medicine. The work was led by cardiologist Nipavan Chiamvimonvat.
The science of using stem cell treatments for heart disease has been full of promise but little progress, Chiamvimonvat said. The inflammation that accompanies heart disease is simply not conducive to stem cell survival.
Prior studies show that stem cells transplanted to the heart experience significant attrition in a very short period of time.
We think weve found a way to quiet that inflammatory environment, giving stem cells a chance to survive and do the healing work we know they can do, said lead author and cardiovascular medicine researcher Padmini Sirish.
Heart failure occurs when the heart no longer pumps blood efficiently, reducing oxygen throughout the body. Survival is around 45-60% five years after diagnosis. It affects approximately 5.7 million people in the U.S., with annual costs of nearly $30 billion. By 2030, it could affect as many as 9 million people at a cost of nearly $80 billion.
Chiamvimonvat often treats patients with heart failure and has been frustrated by the lack of effective medications for the disease, especially when it progresses to later stages. The best current therapies for end-stage heart failure are surgical heart transplants or mechanical heart pumps.
This research was led by cardiologist Nipavan Chiamvimonvat.
She expects her outcome will lead to a two-part treatment for end-stage heart failure that combines an sEH-blocking compound with stem cell transplantation.
Chiamvimonvat and her team tested that theory in mice using cardiac muscle cells known as cardiomyocytes, which were derived from human-induced pluripotent stem cells (hiPSCs). A hiPSC is a cell taken from any human tissue (usually skin or blood) and genetically modified to behave like an embryonic stem cell. They have the ability to form all cell types.
The specific sEH inhibitor used in the study TPPU was selected based on the work of co-author and cancer researcher Bruce Hammock, whose lab has provided detailed studies of nearly a dozen of the enzyme inhibitors.
The researchers studied six groups of mice with induced heart attacks. A group treated with a combination of the inhibitor and hiPSCs had the best outcomes in terms of increased engraftment and survival of transplanted stem cells. That group also had less heart muscle thickening and improved cardiac function.
Taken together, our data suggests that conditioning hiPSC cardiomyocytes with sEH inhibitors may help the cells to better survive the harsh conditions in the muscle damaged by a heart attack, Hammock said.
Chiamvimonvat and her team will next test the process in a larger research animal model to provide more insights into the beneficial role of TPPU. She also wants to test the process with additional heart diseases, including atrial fibrillation. Her ultimate goal, in collaboration with Hammock, is to launch human clinical trials to test the safety of the treatment.
It is my dream as a clinician and scientist to take the problems I see in the clinic to the lab for solutions that benefit our patients, Chiamvimonvat said. It is only possible because of the incredible strength of our team and the extraordinarily collaborative nature of research at UC Davis.
Additional co-authors were Phung Thai, Jun Yang, Xiao-Dong Zhang, Lu Ren, Ning Li, Valeriy Timofeyev, Kin Sing Lee, Carol Nader, Douglas Rowland, Sergey Yechikov, Svetlana Ganaga, J. Nilas Young and Deborah Lieu, all from UC Davis.
Their work was funded by the American Heart Association, Harold S. Geneen Charitable Trust. Rosenfeld Heart Foundation, U.S. Department of Veterans Affairs and the National Institutes of Health (grants T32HL86350, F32HL149288, K99R00ES024806, R35ES030443, P42ES04699, IR35 ES0443-1, P01AG051443, R01DC015135, R56HL138392, R01HL085727, R01HL085844, R01HL137228 and S10RR033106).
The study, titled Suppression of Inflammation and Fibrosis using Soluble Epoxide Hydrolase Inhibitors Enhances Cardiac Stem Cell-Based Therapy, is available online.
More information about UC Davis Health, including its cardiovascular medicine and stem cell programs, is at health.ucdavis.edu.
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UC Davis researchers find a way to help stem cells work ...
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