The IGF axis in the prostate

P. Cohen, D. M. Peehl, R. G. Rosenfeld

Research output: Contribution to journalReview article

143 Scopus citations

Abstract

The insulin-like growth factor (IGF) axis is a multi-component network of molecules involved in the regulation of cell growth. The axis includes two major ligands, (IGF-I and IGF-II), cell surface receptors, (the type I IGF receptor family as well as the type II IGF receptor), a family of high affinity binding proteins which regulate IGF availability to the receptors, (the IGFBPs), and a group of IGFBP proteases which cleave IGFBBPs and modulate IGF action. Human seminal plasma contains IGF-I and -II, IGFBP-2 and -4, as well as IGFBP-3 fragments and IGFBP3 protease activity. A prostatic source for these IGF-axis molecules is likely. We have demonstrated the human prostate to contain all the elements of a functional IGF system. Prostate fibroblasts in primary culture (PC-F) express mRNA for IGF-II and produce IGF-II peptide in biologically active concentrations. This IGF-II appears to be of a high molecular weight (15 kD) species. Prostate epithelial cells in primary culture (PC-E) express the type I IGF receptor. These cells also produce IGFBP-2 and -4, (on both mRNA and peptide levels), while PC-F secrete IGFBP-2, -3 and -4. PC-E are exquisitely sensitive to the mitogenic effects of IGFs. Finally, prostate specific antigen (PSA), secreted from PC- and found in seminal plasma, can function as a potent IGFBP-3 protease. This IGFBP-3 protease activity can remove the inhibitory effects of IGFBP-3 on IGF-I induced PC-3 growth. We have recently shown that PC-F from patients with benign prostatic hypertrophy (BPH) hyper-express mRNA for IGF-II. This observation and other related findings suggest a regression of these fibroblasts to a state reminiscent of fetal fibroblasts. This molecular alteration in a critical component of the prostatic IGF axis in BPH patients may also be involved in the pathogenesis of abnormal prostate epithelial proliferation.

Original languageEnglish (US)
Pages (from-to)81-84
Number of pages4
JournalHormone and Metabolic Research
Volume26
Issue number2
DOIs
StatePublished - Jan 1 1994

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Keywords

  • IGF receptors
  • IGFBP protease
  • benign prostatic hyperplasia
  • binding proteins
  • cancer
  • epithelial cells
  • insulin-like growth factors
  • prostate
  • seminal plasma
  • stromal cells

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Biochemistry
  • Endocrinology
  • Clinical Biochemistry
  • Biochemistry, medical

Cite this

Cohen, P., Peehl, D. M., & Rosenfeld, R. G. (1994). The IGF axis in the prostate. Hormone and Metabolic Research, 26(2), 81-84. https://doi.org/10.1055/s-2007-1000777