Reduced Expression of the Low Affinity Nerve Growth Factor Receptor in Benign and Malignant Human Prostate Tissue and Loss of Expression in Four Human Metastatic Prostate Tumor Cell Lines

Beth R. Pflug, Makoto Onoda, Daniel Djakiew

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Abstract

In the human prostate, a low affinity (p75) nerve growth factor (NGF) receptor (NGF-R) localizes to the epithelia while a NGF-like protein localizes to the stroma. This NGF-like ligand, derived from prostate stromal cell cultures, has been shown to participate in paracrine medi-ated growth of a human tumor epithelial cell line (TSU-prl) in vitro. In order to investigate the role of the NGF-R in neoplastic growth we have examined the expression of the NGF-R in normal prostate tissues, benign prostatic hyperplasia tissues, adenocarcinoma tissues, and four metastatic tumor cell lines of the human prostate. In primary epithelial cell cultures of normal human prostate the p75 NGF-R was localized by immunocytochemistry to cytoplasmic vesicles. Furthermore, Western blot analysis of the NGF-R in subcellular fractions of normal prostate tissue identified an Afr 75,000 immunoreactive protein in the microso-mal fraction under nonreducing conditions of sodium dodecyl sulfate-polyacrylamide gel electrophoresis. However, microsomal preparations of five prostatic adenocarcinoma and five benign prostatic hyperplasia specimens showed varying immunoreactivity among samples, all of which expressed less of the p75 NGF-R than the normal tissue. Interestingly, microsomal preparations of the human prostatic epithelial cell lines, TSU-prl, DU-145, PC-3, and LNCaP did not show NGF-R expression by immunoblot analysis. Hence, expression of the p75 NGF-R in normal prostate tissue, partial loss of NGF-R expression in benign and malignant prostate tissue, and complete loss of NGF-R expression in the four metastatic tumor cell lines, suggests an inverse association of p75 NGF-R expression with the neoplastic progression of the human prostate.

Original languageEnglish (US)
Pages (from-to)5403-5406
Number of pages4
JournalCancer Research
Volume52
Issue number19
StatePublished - Oct 1992

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ASJC Scopus subject areas

  • Oncology
  • Cancer Research

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