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Journal of andrology

Hypoxia-induced apoptosis in the bilateral testes of rats with left-sided varicocele: a new way to think about the varicocele.

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Haifeng Wang
Yinghao Sun
Linhui Wang
Chuanliang Xu
Qing Yang
Bing Liu
Zhiyong Liu

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Abstrakt

Although the varicocele has been studied for many years, its pathophysiology remains unclear. In this study, we investigated the expression of the alpha subunit of hypoxia-inducible factor 1 (HIF-1 alpha) and determined the apoptosis index (AI) in the testes of rats with varicoceles to study the mechanism by which varicoceles induce infertility. A total of 45 Wistar rats were divided into 3 groups: control group, sham surgery group, and experimental group. Forty-nine days after the initial partial ligation of the left renal vein, all of the rats underwent orchiectomy. HIF-1 alpha expression in each testis was analyzed using immunohistochemical methods and enzyme-linked immunosorbent assay. The degree of apoptosis within each testicle was determined using terminal deoxynucleotidyl transferase dUTP nick end labeling. HIF-1 alpha immunoreactivity in the testes of the experimental group was significantly higher than that in those of the control group (P < .05) or the sham group (P < .05). The AI of the germ cells of rats in the experimental group was significantly higher than that in germ cells of rats in the sham group (P < .001) or the control group (P < .001). Additionally, there was a significant positive correlation observed between the AI of germ cells and relative intensity of HIF-1 alpha in the left testis (r = .631; P = .028) and right testis (r = .707; P = .01) of rats in the experimental group. The results of this study showed that a left-sided varicocele could cause bilateral testicular hypoxia and increased germ cell apoptosis, both of which play an important role in testicular dysfunction. Furthermore, HIF-1 alpha is a useful factor that can be used to predict the degree of germ cell apoptosis in rat testes.

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