Stem Cell Memories May Hold Answer to Their Reproduction, Mount Sinai Study Finds
Blood-forming stem cells are able to count and store memories of the number of times that they divide, findings which could have major implications for disease research, scientists at the Icahn School of Medicine at Mount Sinai have found. Their study appeared in the November 17 issue of Cell.
Hematopoietic stem cells (HSCs) are stem cells that reside in bone marrow and are responsible for maintaining the continuous production of blood throughout life. HSCs have been used clinically for decades to treat various blood-borne illnesses ranging from leukemia to severe combined immunodeficiency syndrome. However, a major barrier to treatment is the limited availability of stem cells. Clinicians and researchers have worked to expand stem cell numbers, but have been largely unsuccessful at facilitating reproduction of these cells. This research provides clues as to why these efforts have not succeeded – because these cells count and retain a memory of their divisions, which control their potential for further reproduction.
According to the researchers, the study found that slow cycling cells contained all of the long-term HSC activity among the aging cells in the bone marrow. The data collected further shows that age-related changes to the HSCs, including HSC expansion, are dependent on the cells knowing how many times they have divided.
“What this essentially means is that these important stem cells remember how many times they have divided, and those memories control how they will self-renew in the future,” said Kateri Moore, DVM, Associate Professor of Cell, Developmental and Regenerative Biology at the Icahn School of Medicine at Mount Sinai. “This knowledge may be able to help us find the key to expanding the numbers of these cells for therapeutic and research use.”
Both Dr. Moore and the lead author Jeffrey Bernitz, a PhD candidate at the Icahn School of Medicine at Mount Sinai, hope that the results of this study will provide additional clues that will help us achieve stem cell expansion in the future.
About the Mount Sinai Health System
The Mount Sinai Health System is an integrated health system committed to providing distinguished care, conducting transformative research, and advancing biomedical education. Structured around seven hospital campuses and a single medical school, the Health System has an extensive ambulatory network and a range of inpatient and outpatient services—from community-based facilities to tertiary and quaternary care.
The System includes approximately 7,100 primary and specialty care physicians; 12 joint-venture ambulatory surgery centers; more than 140 ambulatory practices throughout the five boroughs of New York City, Westchester, Long Island, and Florida; and 31 affiliated community health centers. Physicians are affiliated with the renowned Icahn School of Medicine at Mount Sinai, which is ranked among the highest in the nation in National Institutes of Health funding per investigator. The Mount Sinai Hospital is in the "Honor Roll" of best hospitals in America, ranked No. 15 nationally in the 2016-2017 "Best Hospitals" issue of U.S. News & World Report. The Mount Sinai Hospital is also ranked as one of the nation's top 20 hospitals in Geriatrics, Gastroenterology/GI Surgery, Cardiology/Heart Surgery, Diabetes/Endocrinology, Nephrology, Neurology/Neurosurgery, and Ear, Nose & Throat, and is in the top 50 in four other specialties. New York Eye and Ear Infirmary of Mount Sinai is ranked No. 10 nationally for Ophthalmology, while Mount Sinai Beth Israel, Mount Sinai St. Luke's, and Mount Sinai West are ranked regionally. Mount Sinai's Kravis Children's Hospital is ranked in seven out of ten pediatric specialties by U.S. News & World Report in "Best Children's Hospitals."