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Area of Science:

  • Urology
  • Molecular Biology
  • Immunology

Background:

  • Male lower urinary tract symptoms (LUTS) affect over 50% of men over 50.
  • LUTS are often linked to benign prostatic hyperplasia (BPH), but also to fibrotic and inflammatory processes.
  • Osteopontin (OPN) is a pro-inflammatory and pro-fibrotic molecule implicated in BPH.

Purpose of the Study:

  • To investigate if OPN is increased in symptomatic BPH.
  • To determine if prostate cells secrete OPN in response to inflammatory stimuli.
  • To identify OPN's downstream targets in prostate stromal cells.

Main Methods:

  • Immunohistochemistry and Western blot on prostate tissue from surgical BPH (S-BPH) and incidental BPH (I-BPH) patients.
  • Enzyme-linked immunosorbent assay (ELISA) to measure OPN secretion by prostate cells stimulated with IL-1β and TGF-β1.
  • Quantitative polymerase chain reaction (qPCR) to assess gene expression changes in response to OPN.

Main Results:

  • OPN levels were higher in S-BPH compared to I-BPH, with highest concentrations in epithelial cells.
  • Prostate stromal and epithelial cells secreted OPN when stimulated by inflammatory cytokines (IL-1β and TGF-β1).
  • OPN treatment increased pro-inflammatory mRNA expression (CXCL1, CXCL2, CXCL8, PTGS2, IL6) in prostate stromal cells.

Conclusions:

  • OPN is more abundant in symptomatic BPH and its secretion is stimulated by inflammatory cytokines.
  • OPN directly influences stromal cells, promoting the synthesis of pro-inflammatory genes.
  • Targeting OPN could be a therapeutic strategy to alleviate LUTS by modulating inflammatory and fibrotic pathways.