Scientists at Cedars-Sinai have made significant strides in developing "young" immune cells from human stem cells, demonstrating their potential to reverse aging signs and Alzheimer's disease in laboratory mice. These findings, published in the journal Advanced Science, indicate that such advancements could pave the way for novel treatments for age-related and neurodegenerative disorders in humans.
The research team, led by Clive Svendsen, PhD, focused on creating youthful immune cells, specifically mononuclear phagocytes, which play a vital role in clearing harmful substances from the body. As organisms age, the efficacy of these cells diminishes. The researchers utilized human induced pluripotent stem cells—reprogrammed adult cells—to generate new, functional mononuclear phagocytes.
Infusing these lab-engineered immune cells into aging mice and Alzheimer’s disease models resulted in notable improvements in brain function and structure. Treated mice showed enhanced performance in memory tests and maintained a higher number of "mossy cells" in the hippocampus, crucial for learning and memory retention. Additionally, treated mice exhibited healthier microglia, specialized immune cells that typically become less effective with age or Alzheimer’s.
While the precise mechanisms through which these young immune cells exert their benefits remain unclear, researchers suggest they may release anti-aging proteins or remove detrimental factors from the bloodstream, thus indirectly influencing brain health. Ongoing studies are focused on elucidating these mechanisms and translating the findings into human therapies.
The researchers emphasize the personalized therapy potential of these stem cell-derived immune cells, which could be produced in unlimited quantities. This development marks a promising advancement in the fight against cognitive decline associated with aging and Alzheimer’s disease. The research received support from various foundations and institutions, underscoring its significance in the field of regenerative medicine.