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Neurotensin is an autocrine trophic factor stimulated by androgen withdrawal in human prostate cancer

I Sehgal1, S Powers, B Huntley

  • 1Department of Biochemistry, Mayo Clinic, Rochester, MN 55905.

Proceedings of the National Academy of Sciences of the United States of America
|May 24, 1994
PubMed

Insights

Prostate cancer cells develop a new growth pathway using neurotensin when deprived of androgen. This study reveals how androgen-deprived prostate cancer cells switch to an alternative autocrine growth mechanism involving neurotensin.

Area of Science:

  • Oncology
  • Endocrinology
  • Molecular Biology

Background:

  • Prostate cancer cells often become androgen-insensitive after hormone deprivation therapy.
  • Neuropeptides are implicated as potential growth factors in certain prostate cancers.
  • Mechanisms driving androgen-insensitive growth in prostate cancer remain largely undefined.

Purpose of the Study:

  • To investigate the role of neuropeptides in prostate cancer growth following androgen withdrawal.
  • To identify alternative autocrine growth mechanisms in androgen-deprived prostate cancer cells.
  • To explore the neurotensin signaling pathway in LNCaP human prostate cancer cells.

Main Methods:

  • Androgen deprivation and stimulation of LNCaP cells.
  • Measurement of neurotensin production and secretion.
  • Assessment of neurotensin receptor expression and signaling.
  • Analysis of metalloprotease activity in response to androgen levels.

Main Results:

  • Androgen-sensitive LNCaP cells produce and secrete neurotensin upon androgen withdrawal.
  • LNCaP cells express the neurotensin receptor, but only androgen-deprived cells respond to exogenous neurotensin.
  • Androgen-stimulated cells exhibit refractoriness to exogenous neurotensin due to induced metalloprotease activity against neurotensin.

Conclusions:

  • Prostate cancer cells develop an alternative autocrine growth mechanism mediated by neurotensin after androgen deprivation.
  • Neurotensin acts as a crucial growth factor for androgen-deprived prostate cancer cells.
  • Understanding this pathway offers potential therapeutic targets for advanced prostate cancer.

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