Stromal — Epithelial Paracrine Interactions in the Neoplastic Rat and Human Prostate

  • Daniel Djakiew
  • Beth Pflug
  • Makoto Onoda
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 330)


Homotypic paracrine interactions in the rat and human prostate have been investigated using prostatic stromal cells and neoplastic epithelial cells (PA-III, rat; TSU-prl, human). Secretory proteins prepared from each cell type were used to determine the dose dependent regulation of growth (DNA synthesis) of the corresponding homotypic responder cell, as determined by 3H-thymidine incorporation. PA-III secretory protein stimulated rat stromal cell proliferation by 1.8-fold. This stimulatory activity of PA-III protein on stromal cell proliferation was partially reduced (approximately 35%) by treatment with nerve growth factor (NGF) antibody, whereas neither acidic fibroblast growth factor (aFGF) antibody nor basic fibroblast growth factor (bFGF) antibody immunoneutralized the stimulatory activity of PA-III cell protein. In the corresponding opposite interaction, rat stromal cell protein modulated PA-III growth in a biphasic manner. At lower concentrations of stromal cell protein (1.25 ug/ml) PA-III cell growth was stimulated by 1.6-fold, whereas at higher concentrations of protein (100 ug/ml) PA-III cell growth was inhibited to 60%. Treatment of the stromal cell protein (1.25 ug/ml and 100 ug/ml) with NGF antibody reduced PA-III cell relative growth to approximately 30% and 5%, respectively. bFGF antibody treatment of stromal cell protein at 1.25 ug/ml did not influence relative growth, whereas bFGF antibody treatment of 100 ug/ml stromal cell protein reduced relative growth by an additional 40%. Treatment of the stromal cell protein (1.25 ug/ml and 100 ug/ml) with aFGF antibodies reduced relative growth from that observed at these two protein concentrations by approximately 50% in both cases. Human epithelial TSU-prl protein stimulated human stromal cell proliferation approximately 1.7-fold. Treatment of TSU-prl protein with NGF antibody resulted in stimulation of human stromal cell proliferation (4-fold). In the corresponding opposite interaction, human stromal cell secretory protein stimulated TSU-prl epithelial cell proliferation in a dose-dependent manner up to a maximum of 2.6-fold. This stimulation of TSU-prl proliferation by stromal cell secretory protein was reduced to 20% of maximal levels by treatment with antibody against NGF, whereas antibodies against bFGF and aFGF did not significantly influence the stimulatory effect of stromal cell secretory protein mediated proliferation of TSU-prl cells. These results suggest that prostatic stromal cells and neoplastic epithelial cells secrete several paracrine factors. One of these factors is nerve growth factor-like, and appears to have a major non-neurotrophic influence on the paracrine regulation of prostatic growth.


Stromal Cell Nerve Growth Factor Benign Prostatic Hyperplasia Prostatic Growth Paracrine Regulation 
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Copyright information

© Springer Science+Business Media New York 1993

Authors and Affiliations

  • Daniel Djakiew
    • 1
  • Beth Pflug
    • 1
  • Makoto Onoda
    • 1
  1. 1.Department of Anatomy and Cell BiologyGeorgetown University Medical SchoolUSA

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