GLUL mediates FOXO3 O-GlcNAcylation to regulate the osteogenic differentiation of BMSCs and senile osteoporosis.

ABSTRACT: The abnormal osteogenic differentiation of bone marrow mesenchymal stem cells (BMSCs) is an important cause of senile osteoporosis (SOP). Glutamine synthetase (GLUL) is a key enzyme in glutamine biosynthesis; however, its functional role in SOP remains unclear. Here, we found that GLUL expression was downregulated in the BMSCs of SOP patients. Mice with BMSC-specific Glul-knockout (KO) exhibited dysplasia of the skull and phalanges and osteoporosis due to disordered osteogenic differentiation. Mechanistically, GLUL competitively bound to the Tripartite Motif Containing 25 (TRIM25) SPRY subunit, reduced the ubiquitin-mediated degradation of UDP-N-acetylglucosamine pyrophosphorylase 1 (UAP1) and increased the synthesis of uridine 5-diphosphate N-acetylglucosamine (UDP-GlcNAc), thereby regula

SUBMITTER: Zhang L 

PROVIDER: S-EPMC12669651 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature