Figure 7

Proposed model of the protective effect of Ucma/GRP in calcifying mVSMCs. Ucma/GRP expression is increased as a negative feedback loop mechanism when extracellular phosphate is elevated. Ucma/GRP prevents activation of phosphate-induced BMP-2-SMAD signalling in calcifying VSMCs, acting as an inhibitor of signalling cascades that lead to calcification. OCN – osteocalcin, OPN – osteopontin, ALP – alkaline phosphatase, MGP – matrix Gla protein.