ArticleAdvanced science (Weinheim, Baden-Wurttemberg, Germany)2026
Bone Marrow Macrophage STING Signaling is a Direct Nexus Linking Marrow Adipose Expansion to NAD
Article in Advanced science (Weinheim, Baden-Wurttemberg, Germany), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Reversing the destructive remodeling of the bone marrow microenvironment during aging remains a major challenge. Here, we reveal an age-dependent dual role of bone marrow macrophage (BMM) STING signaling during skeletal aging. While BMM STING deficiency is detrimental during early bone development and maturation, it paradoxically confers protection against age-related bone loss from middle age onward. Mechanistically, accumulating bone marrow adipocytes secrete substantial soluble dipeptidyl peptidase 4 (sDPP4). This sDPP4 functions as an extracellular ligand for Toll-like receptor 4 on BMMs, thereby collaborating with endogenous mitochondrial DNA to activate STING signaling. This STING activation concurrently induces a CD38-dependent salvage synthesis pathway. Importantly, this STING-driven upregulation of CD38 not only amplifies bone marrow inflammation but also, through its ecto-nicotinamide adenine dinucleotide (NAD
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