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Free IGF-I ELISA Test

ProductsFree IGF-I ELISA Test
Company Diagnostic Systems Laboratories, Inc.
Item Free IGF-I ELISA Test
Features 
Description Insulin-like growth factor I (IGF-I or somatomedin C) is a 7.6 kDa peptide produced primarily in the liver. It acts as a potent mitogen of cellular proliferation, exerting its actions by binding to specific cell-surface receptors. In the circulation, IGF-I is bound to IGF-binding proteins (IGFBPs), which appear to regulate the actions of IGF-I by modulating the interaction of IGF-I with the Type 1 IGF receptor. The majority of IGF-I in blood is bound to a high molecular weight ternary complex with IGFBP-3 and ALS [1,2]. A smaller proportion of IGF-I circulates in association with other IGFBPs [2], and less than 5% is unbound or free IGF-I. It is believed that free IGF-I represents the biologically active fraction of IGF-I [3].

IGF-I concentrations in serum are dependent on age and sex. Levels increase from birth through mid-puberty, then decline to relatively stable levels during adult life, with a modest decrease in elderly people. In addition, IGF-I levels remain relatively stable throughout the day [4,5]. IGF-I is also dependent on growth hormone (GH) secretion, with IGF-I mediating many of the actions of GH [6]. In GH deficiency, malnutrition [4] and GH-receptor deficiency [7], serum IGF-I levels are low. Conversely, in acromegaly (GH excess) serum IGF-I levels are elevated [4,6]. Measurement of IGF-I levels in serum is a useful diagnostic test for the clinical evaluation of GH-related disorders. Additionally, there is a growing research interest in the role of IGF-I in cancer risk assessment [8.9].

  1. Baxter RC, et al. J Biol Chem 264:11843-11848, 1989.
  2. Rechler M. Vit Horm 47:1-114, 1993.
  3. Juul A. et al. J Clin Endocrinol Metab 82: 2497-2502, 1997.
  4. Lee PDK & Rosenfeld RG. Pediatrician 14:154-161, 1987.
  5. Rosenfeld RG, et al. J. Pediatr 109:428-433, 1986.
  6. Daughaday E & Rotwein P. Endocrin Rev 10:68-91, 1989.
  7. Guevara-Aguirre J, et al. J Clin Endocrinol Metab 76:417-423, 1993.
  8. Chan JM, et al. Science 279:563-566, 1998.
  9. Hankinson SE, et al. The Lancet 351:1373-1374, 1998.
Info Diagnostic Systems Laboratories, Inc.
Customer Service: (800) 231-7970
Web site: http://www.dslabs.com

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