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Abstract A specific bone vessel subtype, strongly positive for CD31 and endomucin (CD31 hi Emcn hi ), is identified as coupling angiogenesis and osteogenesis. The abundance of type CD31 hi Emcn hi vessels decrease during ageing. Here we show that expression of the miR-497∼195 cluster is high in CD31 hi Emcn hi endothelium but gradually decreases during ageing. Mice with depletion of miR-497∼195 in endothelial cells show fewer CD31 hi Emcn hi vessels and lower bone mass. Conversely, transgenic overexpression of miR-497∼195 in murine endothelium alleviates age-related reduction of type CD31 hi Emcn hi vessels and bone loss. miR-497∼195 cluster maintains the endothelial Notch activity and HIF-1α stability via targeting F-box and WD-40 domain protein (Fbxw7) and Prolyl 4-hydroxylase possessing a transmembrane domain (P4HTM) respectively. Notably, endothelialium-specific activation of miR-195 by intravenous injection of aptamer-agomiR-195 stimulates CD31 hi Emcn hi vessel and bone formation in aged mice. Together, our study indicates that miR-497∼195 regulates angiogenesis coupled with osteogenesis and may represent a potential therapeutic target for age-related osteoporosis.
Yang et al. (Fri,) studied this question.