TGFβ1⁺CCR5⁺ neutrophil subset increases in bone marrow and causes age-related osteoporosis in male mice.

ABSTRACT: TGFβ1 induces age-related bone loss by promoting degradation of TNF receptor-associated factor 3 (TRAF3), levels of which decrease in murine and human bone during aging. We report that a subset of neutrophils (TGFβ1⁺CCR5⁺) is the major source of TGFβ1 in murine bone. Their numbers are increased in bone marrow (BM) of aged wild-type mice and adult mice with TRAF3 conditionally deleted in mesenchymal progenitor cells (MPCs), associated with increased expression in BM of the chemokine, CCL5, suggesting that TRAF3 in MPCs limits TGFβ1⁺CCR5⁺ neutrophil numbers in BM of young mice. During aging, TGFβ1-induced TRAF3 degradation in MPCs promotes NF-κB-mediated expression of CCL5 by MPCs, associated with higher TGFβ1⁺CCR5⁺ neutrophil

SUBMITTER: Li J 

PROVIDER: S-EPMC9834218 | biostudies-literature | 2023 Jan

REPOSITORIES: biostudies-literature