Explore the effects of pulmonary fibrosis on sperm quality and the role of the PI3K/Akt pathway based on rat model

Researches were reported that respiratory diseases can lead to male infertility; however, it is unclear whether there is a relationship between pulmonary fibrosis (PF) and male infertility. This study examined the influence of PF on sperm quality and its mechanisms. The key signalling pathway of male infertility caused by PF was predicted based on bioinformatics research. After modelling, we evaluated semen quality. Real-time quantitative polymerase chain reaction and Western blotting were used to measure the protein and mRNA expression levels of phosphatidylinositol 3-kinase (PI3K), phosphorylation-protein kinase B (p-Akt) and B-cell lymphoma 2 (Bcl2) in rat testicular cells. Compared with group A (48.77 +/- 4.67; 59.77 +/- 4.79), the sperm concentration and total sperm viability of group B (8.44 +/- 1.71; 15.39 +/- 3.48) showed a downward trend (p < 0.05). Western blotting showed that the protein expressions of PI3K, p-Akt and Bcl2 in the testes of group B (0.30 +/- 0.06; 0.27 +/- 0.05; 0.15 +/- 0.03) was significantly lower than those of group A (0.71 +/- 0.07; 0.72 +/- 0.06; 0.50 +/- 0.06) (p < 0.05). The hypoxic environment induced by PF can inhibit the expression of PI3K, p-Akt and Bcl2 protein and eventually cause dysfunctional spermatogenesis.