Author:
Popovics Petra,Schally Andrew V.,Salgueiro Luis,Kovacs Krisztina,Rick Ferenc G.
Abstract
The etiology of benign prostatic hyperplasia (BPH) is multifactorial, and chronic inflammation plays a pivotal role in its pathogenesis. Growth hormone-releasing hormone (GHRH) is a hypothalamic neuropeptide that has been shown to act as paracrine/autocrine factor in various malignancies including prostate cancer. GHRH and its receptors are expressed in experimental models of BPH, in which antagonists of GHRH suppressed the levels of proinflammatory cytokines and altered the expression of genes related to epithelial-to-mesenchymal transition (EMT). We investigated the effects of GHRH antagonist on prostatic enlargement induced by inflammation. Autoimmune prostatitis in Balb/C mice was induced by a homogenate of reproductive tissues of male rats. During the 8-wk induction of chronic prostatitis, we detected a progressive increase in prostatic volume reaching 92% at week 8 compared with control (P < 0.001). Daily treatment for 1 mo with GHRH antagonist MIA-690 caused a 30% reduction in prostate volume (P < 0.05). Conditioned medium derived from macrophages increased the average volume of spheres by 82.7% (P < 0.001) and elevated the expression of mRNA for N-cadherin, Snail, and GHRH. GHRH antagonist reduced the average volume of spheres stimulated by inflammation by 75.5% (P < 0.05), and TGF-β2 by 91.8% (P < 0.01). The proliferation of primary epithelial cells stimulated by IL-17A or TGF-β2 was also inhibited by 124.1% and 69.9%, respectively. GHRH stimulated the growth of BPH-1 and primary prostate spheres. This study provides evidence that GHRH plays important roles in prostatic inflammation and EMT and suggests the merit of further investigation to elucidate the effects of GHRH antagonists in prostatitis and BPH.
Funder
Urology Care Foundation
U.S. Department of Veterans Affairs
University of Miami
Publisher
Proceedings of the National Academy of Sciences
Reference59 articles.
1. Benign prostatic hyperplasia: An overview;Roehrborn;Rev Urol,2005
2. Origin and evolution of benign prostatic enlargement;McNeal;Invest Urol,1978
3. Genetic and cellular characteristics of bladder outlet obstruction;Levin;Urol Clin North Am,1995
4. Obstructive response of human bladder to BPH vs. rabbit bladder response to partial outlet obstruction: A direct comparison
5. Dutasteride for the treatment of prostate-related conditions;Slater;Expert Opin Drug Saf,2012
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