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Rapamycin Alleviates Hormone Imbalance-Induced Chronic Nonbacterial Inflammation in Rat Prostate Through Activating Autophagy via the mTOR/ULK1/ATG13 Signaling Pathway.
Inflammation 2018 August
Chronic prostatitis (CP) is a clinically common disease with high morbidity. It affects the patients' quality of life (QoL) as well as physical and mental health seriously due to the recurring symptoms of lower urinary tract and genitalia. As the opinions about the etiology of CP are still not uniform, it is very difficult to be treated or even cured. Autophagy is a highly conserved physiological function which is widely found in eukaryotic cells. In general, cells maintain a certain level of autophagy under physiological conditions, and the basal level of autophagy can be regulated by a variety of autophagy-related genes under stress such as hunger, infection, trauma, and other circumstances. Therefore, the main purpose of this study is to investigate the role of autophagy in chronic nonbacterial prostatitis (CNP, also called CP). In this paper, we established the CNP model via hypodermic injection of 17β-estradiol and subsequently abdominal rapamycin (a common autophagy inducer) treatment based on castrated rats. Then, the expression of nuclear factor-κB (NF-κB), interleukin-1β (IL-1β), and autophagy-related markers as well as autophagosome formation in prostate tissues, peripheral blood mononuclear cells (PBMCs), and serum of rats were evaluated respectively. In addition to some histological changes in the prostate tissues, we found the levels of NF-κB and IL-1β were significantly increased in the model group, along with significantly suppressed autophagy, whereas rapamycin could reverse these effects which involved in the mTOR/ULK1/ATG13 signaling pathway. In conclusion, our results suggested that rapamycin could ameliorate hormone imbalance-induced CNP by activating autophagy.
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