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IGFBP-1, Total IRMA Test

ProductsIGFBP-1, Total IRMA Test
Company Diagnostic Systems Laboratories, Inc.
Item IGFBP-1, Total IRMA Test
Features Inquire
Description Human Insulin-like Growth Factor Binding Protein-1 (IGFBP-1) is a phosphoprotein, produced primarily in the liver, which specifically binds and modulates the bioactivity of IGF-I and IGF-II [1]. The role of IGFBP-1 has not been completely defined, but the nature of its regulation suggests that IGFBP-1 may be involved in glucose regulation and IGF-mediated substrate utilization [1,2]. IGFBP-1 has been shown to inhibit [3,4] as well as augment [5,6] IGF bioactivity. These paradoxical reports may be due to differential phosphorylation of IGFBP-1 which may significantly alter its affinity for IGFs and, therefore, its capacity to modulate their cellular responsiveness. As many as five IGFBP-1 variants, differing in their state of phosphorylation and relative expression in serum, amniotic fluid, decidua and cell culture media have been reported [7-11]. Non-phosphorylated IGFBP-1 has been shown to have 4- to 6-fold lower affinity for IGF-I compared with phosphorylated IGFBP-1 variants [7,9]. IGFBP-1 levels are inversely related to insulin concentrations and are not correlated with growth hormone or glucose levels [12,13]. Subsequently, measurement of IGFBP-1 levels may be useful as a marker of insulin action and hepatocyte function for research investigations.

  1. Lee PDK, et al. Proc Soc Exp Biol Med 204:4-29, 1993.
  2. Holly JMP. Acta Endocrinol 124 (supp 2): 55-62, 1991.
  3. Lewitt MS, et al. Endocrinology 124:2254-2256, 1991.
  4. Liu L, et al. Biochem Biophys Res Commun. 174:673-679, 1991.
  5. Eglin RG, et al. Proc Natl Acad Sci USA 84:3254-3258.
  6. Busby WH, et al. Endocrinology 125:7481-7485, 1989.
  7. Jones JI, et al. Proc Natl Acad Sci USA 88:7481-7485, 1991.
  8. Frost RA & Tseng L. J Biol Chem 266:18082-18088, 1991.
  9. Jones JI, et al. J Biol Chem 268:1125-1131, 1993.
  10. Koistinen R, et al. Clinica Chemica Acta 215:189-199, 1993.
  11. Westwood M, et al. J Clin Endocrinol Metab 70:1735-1741, 1994.
  12. Conover CA, et al. Diabetes 39:1251-1256, 1990.
  13. Lee PDK, et al. Metabolism 42:409-414, 1993.
Info Diagnostic Systems Laboratories, Inc.
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Each handle is designed to fit a specific trephine size....
Each handle is designed to fit a specific trephine size....
Each handle is designed to fit a specific trephine size. For use in performing free-hand uniform donor buttons....
Each handle is designed to fit a specific trephine size. For use in performing free-hand uniform donor buttons....
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