Involvement of nuclear factor-kappa B on corticosterone-induced rat Leydig cell apoptosis

Qian Wang, Hui-Bao Gao
2006 Asian Journal of Andrology  
Aim: To investigate the activation of nuclear factor-kappa B (NF-kappa B) and its function in glucocorticoid-induced Leydig cell apoptosis. Methods: The Leydig cells were isolated from male Sprague-Dawley rats (90 days of age) and were incubated with corticosterone (CORT, glucocorticoid in rat) for 6 h, 12 h and 24 h, respectively. The P65 subunit of NF-kappa B (NF-kappa B/P65) in nuclei and the inhibitor of NF-kappa B (Ikappa B) in cytoplasm were analyzed by Western-blotting. The Leydig cells
more » ... . The Leydig cells were treated with anti-Fas antibody for 3 h followed by Western blotting to assay the changes of NF-kappa B/P65 in nuclei and in cytoplasm. The role of NF-kappa B in CORTinduced Leydig cell apoptosis was evaluated by observing the effects of NF-kappa B/P65 overexpression and inhibiting activation of NF-kappa B by 100 µmol/L Pyrrolidine dithiocarbamate (PDTC) on this apoptosis. Results: The treatment of Leydig cells with CORT increased the levels of NF-kappa B/P65 in nuclei and decreased the levels of Ikappa B in cytoplasm. Following the Leydig cells were treated with anti-Fas antibody, the levels of NF-kappaB/P65 was increased in nuclei and decreased in cytoplasm. The CORT-induced Leydig cell apoptosis was inhibited by overexpressed NF-kappaB/P65 and was enhanced by incubation with PDTC. Conclusion: NF-kappa B is activated by increased FasL/Fas in CORT-induced Leydig cell apoptosis. NF-kappa B may play an anti-apoptotic role in this apoptosis. (Asian J Androl 2006 Nov; 8: 693-702)
doi:10.1111/j.1745-7262.2006.00212.x pmid:16855770 fatcat:ats57uslyfcajlrjnybdjkpurq