Insulin-like growth factor 2 (IGF-2) is one of three protein hormones that share structural similarity to insulin. The MeSH definition reads: "A well-characterized neutral peptide believed to be secreted by the liver and to circulate in the blood. It has growth-regulating, insulin-like and mitogenic activities. The growth factor has a major, but not absolute, dependence on somatotropin. It is believed to be a major fetal growth factor in contrast to Insulin-like growth factor 1, which is a major growth factor in adults".1
In humans, the IGF2 gene is located on chromosome 11p15.5, a region which contains numerous imprinted genes. In mice this homologous region is found at distal chromosome 7. In both organisms, Igf2 is imprinted, with expression resulting favourably from the paternally inherited allele. However, in some human brain regions a loss of imprinting occurs resulting in both IGF2 and H19 being transcribed from both parental alleles.2
The protein CTCF is involved in repressing expression of the gene, by binding to the H19 imprinting control region (ICR) along with Differentially-methylated Region-1 (DMR1) and Matrix Attachment Region -3 (MAR3). These three DNA sequences bind to CTCF in a way that limits downstream enhancer access to the Igf2 region. The mechanism in which CTCF binds to these regions is currently unknown, but could include either a direct DNA-CTCF interaction or it could possibly be mediated by other proteins. In mammals (mice, humans, pigs), only the allele for insulin-like growth factor-2 (IGF2) inherited from one's father is active; that inherited from the mother is not — a phenomenon called imprinting.The mechanism: the mother's allele has an insulator between the IGF2 promoter and enhancer. So does the father's allele, but in his case, the insulator has been methylated. CTCF can no longer bind to the insulator, and so the enhancer is now free to turn on the father's IGF2 promoter.citation needed
The major role of IGF-2 is as a growth promoting hormone during gestation.
In the process of folliculogenesis, IGF-2 is created by thecal cells to act in an autocrine manner on the theca cells themselves, and in a paracrine manner on granulosa cells in the ovary.citation needed IGF2 promotes granulosa cell proliferation during the follicular phase of the menstrual cycle, acting alongside follicle stimulating hormone (FSH).citation needed After ovulation has occurred, IGF-2 promotes progesterone secretion during the luteal phase of the menstrual cycle, together with luteinizing hormone (LH). Thus, IGF2 acts as a co-hormone together with both FSH and LH.citation needed
A study at the Mount Sinai School of Medicine found that IGF-2 may be linked to memory and reproduction.3 A study at the European Neuroscience Institute-Goettingen (Germany) found that fear extinction-induced IGF2/IGFBP7 signalling promotes the survival of 17–19-day-old newborn hippocampal neurons. This suggests that therapeutic strategies that enhance IGF2 signalling and adult neurogenesis might be suitable to treat diseases linked to excessive fear memory such as PTSD.4
It is sometimes produced in excess in islet cell tumors, causing hypoglycemia. Doege-Potter syndrome is a paraneoplastic syndrome5 in which hypoglycemia is associated with the presence of one or more non-islet fibrous tumors in the pleural cavity. Loss of imprinting of IGF2 is a common feature in tumors seen in Beckwith-Wiedemann syndrome. As IGF2 promotes development of fetal pancreatic beta cells, it is believed to be related to some forms of diabetes mellitus. Preeclampsia induces a decrease in methylation level at IGF2 demethylated region, and this might be among the mechanisms behind the association between intrauterine exposure to preeclampsia and high risk for metabolic diseases in the later life of the infants.6
^Pham, N. V.; Nguyen, M. T.; Hu, J. F.; Vu, T. H.; Hoffman, A. R. (1998). "Dissociation of IGF2 and H19 imprinting in human brain". Brain research810 (1-2): 1–8. PMID9813220.
^Chen DY, Stern SA, Garcia-Osta A, Saunier-Rebori B, Pollonini G, Bambah-Mukku D, Blitzer RD, Alberini CM (27 January 2011). "A critical role for IGF-II in memory consolidation and enhancement". Nature469: 491–497. doi:10.1038/nature09667. PMID21270887.
^Balduyck B, Lauwers P, Govaert K, Hendriks J, De Maeseneer M, Van Schil P (July 2006). "Solitary fibrous tumor of the pleura with associated hypoglycemia: Doege-Potter syndrome: a case report". J Thorac Oncol1 (6): 588–90. doi:10.1097/01243894-200607000-00016. PMID17409923.
^ abStorch S, Kübler B, Höning S, Ackmann M, Zapf J, Blum W, Braulke T (Dec 2001). "Transferrin binds insulin-like growth factors and affects binding properties of insulin-like growth factor binding protein-3". FEBS Lett.509 (3): 395–8. doi:10.1016/S0014-5793(01)03204-5. PMID11749962.
^Buckway CK, Wilson EM, Ahlsén M, Bang P, Oh Y, Rosenfeld RG (Oct 2001). "Mutation of three critical amino acids of the N-terminal domain of IGF-binding protein-3 essential for high affinity IGF binding". J. Clin. Endocrinol. Metab.86 (10): 4943–50. doi:10.1210/jcem.86.10.7936. PMID11600567.
^Twigg SM, Baxter RC (Mar 1998). "Insulin-like growth factor (IGF)-binding protein 5 forms an alternative ternary complex with IGFs and the acid-labile subunit". J. Biol. Chem.273 (11): 6074–9. doi:10.1074/jbc.273.11.6074. PMID9497324.
^Firth SM, Ganeshprasad U, Baxter RC (Jan 1998). "Structural determinants of ligand and cell surface binding of insulin-like growth factor-binding protein-3". J. Biol. Chem.273 (5): 2631–8. doi:10.1074/jbc.273.5.2631. PMID9446566.
Butler AA, Yakar S, Gewolb IH, Karas M, Okubo Y, LeRoith D (1999). "Insulin-like growth factor-I receptor signal transduction: at the interface between physiology and cell biology.". Comp. Biochem. Physiol. B, Biochem. Mol. Biol.121 (1): 19–26. doi:10.1016/S0305-0491(98)10106-2. PMID9972281.
Kalli KR, Conover CA (2004). "The insulin-like growth factor/insulin system in epithelial ovarian cancer.". Front. Biosci.8: d714–22. doi:10.2741/1034. PMID12700030.