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Expression of receptor protein tyrosine phosphatase alpha mRNA in human prostate cancer cell lines

S Zelivianski1, J Dean, D Madhavan

  • 1Department of Biochemistry/Molecular Biology, University of Nebraska Medical Center, Omaha 68198-4525, USA.

Molecular and Cellular Biochemistry
|August 12, 2000
PubMed

Insights

Receptor protein tyrosine phosphatase alpha (RPTPalpha) mRNA expression varies across human tissues and is differentially regulated by growth factors and hormones in prostate cancer cells. RPTPalpha regulation in LNCaP cells mirrors prostatic acid phosphatase (PAcP) expression.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Receptor protein tyrosine phosphatase alpha (RPTPalpha) is a transmembrane protein implicated in neuronal differentiation.
  • Understanding RPTPalpha regulation is crucial for insights into epithelial cell differentiation and cancer biology.

Purpose of the Study:

  • To investigate the expression of RPTPalpha mRNA in normal human tissues.
  • To explore the regulation of RPTPalpha mRNA expression in human prostate cancer cell lines with varying differentiation and androgen sensitivity.

Main Methods:

  • Northern blot analysis was used to detect RPTPalpha mRNA levels.
  • Human prostate cancer cell lines (LNCaP, PC-3, DU145) with distinct differentiation markers (PAcP) and androgen sensitivity were utilized.
  • Cells were treated with fetal bovine serum (FBS), 5alpha-dihydrotestosterone (DHT), and sodium butyrate.

Main Results:

  • RPTPalpha mRNA was detected in various normal human tissues.
  • In androgen-sensitive LNCaP cells, FBS and DHT down-regulated RPTPalpha mRNA, similar to PAcP.
  • FBS up-regulated RPTPalpha mRNA in androgen-insensitive PC-3 and DU145 cells, while sodium butyrate had differential effects on RPTPalpha mRNA in these cell lines.

Conclusions:

  • RPTPalpha mRNA expression is present in diverse normal human tissues.
  • The regulation of RPTPalpha mRNA expression in prostate cancer cells is cell-type specific and influenced by differentiation status and hormonal sensitivity.
  • RPTPalpha expression in LNCaP cells appears to be regulated by mechanisms similar to those of PAcP.

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