PMID: 6098361Nov 1, 1984Paper

Chemistry, structure, and function of insulin-like growth factors and their receptors: a review

Canadian Journal of Biochemistry and Cell Biology = Revue Canadienne De Biochimie Et Biologie Cellulaire
J F Perdue

Abstract

Human serum contains two classes of somatomedins (Sm) with similar three-dimensional structures and mass (i.e., approximately 7500 kdaltons (kd), but that can be distinguished from each other by their isoelectric point (pI) values. Those with alkaline pI's include the presumably identical molecules of insulin-like growth factor I (IGF-I), SmA, SmC, and basic Sm. In humans, the neutral-acidic class of Sm is represented by IGF-II. The sera of rats and other animals contain similar classes of Sm. In normal children and adults, plasma levels of both IGF-I and -II are under growth hormone control, although only elevated concentrations of the former can be positively correlated with adolescent skeletal growth. Elevated blood levels of IGF-II or an embryonic form of it, however, are correlated with fetal development of rats, sheep, and possibly in humans. As evidenced from competitive radioreceptor binding studies and affinity-labelling techniques, receptors that bind insulin and IGF-I are immunologically, structurally, and functionally related: monoclonal and polyclonal antibodies to insulin receptors recognize determinants on receptors that bind IGF-I; both receptors have 140-, 95-, and possibly 45-kd subunits that are interchain di...Continue Reading

Citations

Apr 1, 1989·Journal of Endocrinological Investigation·A Barreca, F Minuto
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