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Interleukin-17 Induces Expression of Chemokines and Cytokines in Prostatic Epithelial Cells but Does Not Stimulate
Zongbing You1, Dongxia Ge1, Sen Liu1
1Department of Structural & Cellular Biology, Department of Orthopaedic Surgery, Tulane Cancer Center, Louisiana Cancer Research Consortium, Tulane Center for Stem Cell Research and Regenerative Medicine, Tulane Center for Aging, Tulane University School of Medicine, New Orleans, Louisiana 70112.
Background:
Interleukin-17 (IL-17A) expression is increased in prostate cancer. This study investigated the expression of IL-17A receptor C (IL-17RC) in prostatic intraepithelial neoplasia (PIN) lesions and the effects of IL-17A on prostatic epithelial cells in in-vitro studies.
Methods:
IL-17RC expression in human and rodent prostate tissues was detected by immunohistochemistry. Quantitative real-time reverse-transcription polymerase chain reaction (qRT-PCR) and Western blot analyses were used to determine mRNA and protein expression in human and mouse prostatic epithelial cell lines.
Results:
IL-17RC protein was increased in human and rodent PIN lesions, compared to the normal human and rodent prostatic epithelium. IL-17A treatment activated the Nuclear Factor-κB (NF-κB) and/or Extracellular signal-Regulated Kinase (ERK) pathways in human PIN and LNCaP cell lines as well as mouse prostate cancer cell line TRAMP-C1. IL-17A treatment did not affect cell growth of the cell lines studied. However, IL-17A induced expression of CXCL1, CXCL2, CCL2, CCL5, and IL-6 in human and mouse prostatic epithelial cell lines. When the full-length IL-17RC was over-expressed in human PIN and LNCaP cell lines, activation of NF-κB and/or ERK pathways and expression of CXCL1, CXCL2, and CCL5 chemokines were significantly enhanced upon IL-17A treatment.
Conclusion:
These findings suggest that the prostatic epithelial cells in PIN lesions may respond to IL-17A stimuli with augmented synthesis of chemokines, due to increased IL-17RC expression.
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