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The insulin-like growth factor system in the prostate

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Summary

The insulin-like growth factor (IGF) system is involved in the regulation of cell growth. The system involves a network of molecules that includes the IGFs themselves (IGF-I and -II), IGF receptors (types I and II), IGF-binding proteins (IGFBP-1 through -6), and IGFBP proteases. Characterization of this complex system in the prostate has recently been initiated. Prostatic cell lines as well as primary cultures of prostatic epithelial and stromal cells have been analyzed for expression of IGFs, receptors, and IGFBPs. Prostatic epithelial cells and, quite likely, stromal cells as well respond to the mitogenic activity of IGFs via the type I IGF receptor. Prostatic stromal cells synthesize and secrete IGF-II; there is evidence that prostatic cell lines also synthesize IGFs, but this has not been confirmed in primary cultures of prostatic epithelial cells. Prostatic stromal and epithelial cells secrete a number of IGFBPs. The biological impact of some of these IGFBPs on the growth of prostatic cells has been examined, and proteolytic cleavage of IGFBP-3 by prostate-specific antigen (PSA) has been demonstrated. Aberrations in several elements of the IGF system have been observed in stromal cells derived from benign prostatic hyperplasia (BPH). The IGF system may therefore have a part in the etiology of BPH as well as in normal and malignant processes in the prostate.

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Authors and Affiliations

  1. Department of Urology, Stanford University School of Medicine, 94305-5118, Stanford, CA, USA

    D. M. Peehl

  2. Department of Pediatrics, University of Pennsylvania School of Medicine, 19104, Philadelphia, PA, USA

    P. Cohen

  3. Department of Pediatrics, Oregon Health Sciences University, 97201, Portland, OR, USA

    R. G. Rosenfeld

Authors
  1. D. M. Peehl
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  2. P. Cohen
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  3. R. G. Rosenfeld
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Peehl, D.M., Cohen, P. & Rosenfeld, R.G. The insulin-like growth factor system in the prostate. World J Urol 13, 306–311 (1995). https://doi.org/10.1007/BF00185974

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