New insight into the mouse blood stem cell aging process
In this study, investigators sought out changes in the aging bone marrow of mice that may contribute to the diminished capacity of HSCs to develop into different types of blood cells. They reported that characteristic hallmarks of aging HSCs in middle-aged female mice are linked to a reduction in the level of a hormone called insulin-like growth factor 1 (IGF1) in the bone marrow. Interestingly, IGF1 treatment of HSCs from middle-aged female mice restored characteristics of younger, healthier HSCs. These findings suggest that therapeutic strategies aimed at increasing IGF1 levels in the bone marrow may be able to halt or partially reverse HSC aging, and, thereby, boost HSC function through middle age and perhaps longer.
Young K, Eudy E, Bell R,…Trowbridge JJ. Decline in IGF1 in the bone marrow microenvironment initiates hematopoietic stem cell aging. Cell Stem Cell 28: 1473-1482.e7, 2021.