Insulin-like growth factor-binding protein 4 is a protein that in humans is encoded by the IGFBP4gene.[5][6][7]
Function
This gene is a member of the insulin-like growth factor binding protein (IGFBP) family and encodes a protein with an IGFBP domain and a thyroglobulin type-I domain. The protein binds both insulin-like growth factors (IGFs) I and II and circulates in the plasma in both glycosylated and non-glycosylated forms. Binding of this protein prolongs the half-life of the IGFs and alters their interaction with cell surface receptors.[8]
IGFBP-4 is a unique protein and it consistently inhibits several cancer cells in vivo and in vitro. Its inhibitory action has been shown in vivo in prostate and colon. It is secreted by all colon cancer cells.
Clinical significance
The protein itself does not prevent the formation of cancer.[9] However it may reduce the growth of cancer and act as an apoptotic factor.
^Zazzi H, Nikoshkov A, Hall K, Luthman H (1998). "Structure and transcription regulation of the human insulin-like growth factor binding protein 4 gene (IGFBP4)". Genomics. 49 (3): 401–10. doi:10.1006/geno.1998.5283. PMID9615225.
Bajalica S, Allander SV, Ehrenborg E, Brøndum-Nielsen K, Luthman H, Larsson C (1992). "Localization of the human insulin-like growth-factor-binding protein 4 gene to chromosomal region 17q12-21.1". Hum. Genet. 89 (2): 234–6. doi:10.1007/BF00217129. PMID1375185. S2CID22341448.
Culouscou JM, Shoyab M (1991). "Purification of a colon cancer cell growth inhibitor and its identification as an insulin-like growth factor binding protein". Cancer Res. 51 (11): 2813–9. PMID1709585.
Tonin P, Ehrenborg E, Lenoir G, Feunteun J, Lynch H, Morgan K, Zazzi H, Vivier A, Pollak M, Huynh H (1994). "The human insulin-like growth factor-binding protein 4 gene maps to chromosome region 17q12-q21.1 and is close to the gene for hereditary breast-ovarian cancer". Genomics. 18 (2): 414–7. doi:10.1006/geno.1993.1487. PMID7507078.
Han VK, Matsell DG, Delhanty PJ, Hill DJ, Shimasaki S, Nygard K (1996). "IGF-binding protein mRNAs in the human fetus: tissue and cellular distribution of developmental expression". Horm. Res. 45 (3–5): 160–6. doi:10.1159/000184780. PMID8964576.
Di Battista JA, Doré S, Morin N, He Y, Pelletier JP, Martel-Pelletier J (1997). "Prostaglandin E2 stimulates insulin-like growth factor binding protein-4 expression and synthesis in cultured human articular chondrocytes: possible mediation by Ca(++)-calmodulin regulated processes". J. Cell. Biochem. 65 (3): 408–19. doi:10.1002/(SICI)1097-4644(19970601)65:3<408::AID-JCB10>3.0.CO;2-B. PMID9138096. S2CID9142234.