Promotes renal phosphate excretion and inhibits intestinal phosphate absorption (PubMed:14962809, PubMed:19005008). Promotes bone mineralization by osteoblasts and cartilage mineralization by chondrocytes (PubMed:18162525, PubMed:19998030, PubMed:22766095). Regulates the mineralization of the extracellular matrix of the craniofacial complex, such as teeth, bone and cartilage (By similarity). Promotes dental pulp stem cell proliferation and differentiation (PubMed:22341070). {ECO:0000250|UniProtKB:Q8K4L6, ECO:0000269|PubMed:14962809, ECO:0000269|PubMed:18162525, ECO:0000269|PubMed:19005008, ECO:0000269|PubMed:19998030, ECO:0000269|PubMed:22341070, ECO:0000269|PubMed:22766095}. This is the function of MEPE (matrix extracellular phosphoglycoprotein, ENSG00000152595).