Insulin-like growth factor-binding protein 3, also known as IGFBP-3, is a protein that in humans is encoded by the IGFBP3gene. IGFBP-3 is one of six IGF binding proteins (IGFBP-1 to IGFBP-6) that have highly conserved structures and bind the insulin-like growth factors IGF-1 and IGF-2 with high affinity. IGFBP-7, sometimes included in this family, shares neither the conserved structural features nor the high IGF affinity. Instead, IGFBP-7 binds IGF1R, which blocks IGF-1 and IGF-2 binding, resulting in apoptosis.[5]
^"Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
^"Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
^Evdokimova V, Tognon CE, Benatar T, Yang W, Krutikov K, Pollak M, et al. (December 2012). "IGFBP7 binds to the IGF-1 receptor and blocks its activation by insulin-like growth factors". Science Signaling. 5 (255): ra92. doi:10.1126/scisignal.2003184. PMID23250396. S2CID24794913.