Open AccessAn aged bone marrow niche restrains rejuvenated hematopoietic stem cells
Author(s) -
Guidi Novella,
Marka Gina,
Sakk Vadim,
Zheng Yi,
Florian Maria Carolina,
Geiger Hartmut
Publication year - 2021
Publication title -
stem cells
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.159
H-Index - 229
eISSN - 1549-4918
pISSN - 1066-5099
DOI - 10.1002/stem.3372
Subject(s) - biology , stem cell , haematopoiesis , niche , ex vivo , bone marrow , immunology , microbiology and biotechnology , cdc42 , lymphopoiesis , hematopoietic stem cell , in vivo , signal transduction , genetics , ecology
Abstract Aging‐associated leukemia and aging‐associated immune remodeling are in part caused by aging of hematopoietic stem cells (HSCs). An increase in the activity of the small RhoGTPase cell division control protein 42 (Cdc42) within HSCs causes aging of HSCs. Old HSCs, treated ex vivo with a specific inhibitor of Cdc42 activity termed CASIN, stay rejuvenated upon transplantation into young recipients. We determined in this study the influence of an aged niche on the function of ex vivo rejuvenated old HSCs, as the relative contribution of HSCs intrinsic mechanisms vs extrinsic mechanisms (niche) for aging of HSCs still remain unknown. Our results show that an aged niche restrains the function of ex vivo rejuvenated HSCs, which is at least in part linked to a low level of the cytokine osteopontin found in aged niches. The data imply that sustainable rejuvenation of the function of aged HSCs in vivo will need to address the influence of an aged niche on rejuvenated HSCs.