Scientific background: |
IGFBP1, Insulin-like growth factor-binding protein 1, also known as placental protein 12 (PP12), is a protein that in humans is encoded by the IGFBP1 gene. The IGFBP1 gene has 4 exons and spans 5.9 kb. The IGFBP1gene is localized to 7p13-p12 by in situ hybridization. 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 type-I thyroglobulin domain. The protein binds both insulin-like growth factors (IGFs) I and II and circulates in the plasma. Binding of this protein prolongs the half-life of the IGFs and alters their interaction with cell surface receptors. Alternate transcriptional splice variants, encoding different isoforms, have been characterized. |
References: |
1. Alitalo, T., Kontula, K., Koistinen, R., Aalto-Setala, K., Julkunen, M., Janne, O. A., Seppala, M., de la Chapelle, A.The gene encoding human low-molecular weight insulin-like growth-factor binding protein (IGF-BP25): regional localization to 7p12-p13 and description of a DNA polymorphism.Hum. Genet. 83: 335-338, 1989.
2. Brinkman, A., Groffen, C. A. H., Kortleve, D. J., Drop, S. L. S.Organization of the gene encoding the insulin-like growth factor binding protein IBP-1.Biochem. Biophys. Res. Commun. 157: 898-907, 1988.
3. Leu, J. I.-J., George, D. L.Hepatic IGFBP1 is a prosurvival factor that binds to BAK, protects the liver from apoptosis, and antagonizes the proapoptotic actions of p53 at mitochondria.Genes Dev. 21: 3095-3109, 2007.
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