Objectives Inflammation can cause degenerative changes of reproductive function. Oleanolic acid (OA), the effective component from Ligustrum lucidum Ait., exhibits significantly anti-inflammation and antiageing activity. However, whether OA restores testicular dysfunction via inhibition of inflammation with ageing is unclear. Here, in a natural ageing rat model, we investigated the protection effects of OA and its mechanism of action.
Methods Eighteen-month-old Sprague Dawley (SD) rats were randomly divided into ageing control group and two OA-treated groups (5 and 25 mg/kg). Nine-month-old SD rats were used as adult controls. All rats were received either vehicle or OA for 6 months. Then, histomorphology, weight and index of testis, protein expression and immunohistochemistry were examined.
Key findings Oleanolic acid significantly restored testicular morphology and improved testicular weight and index. Moreover, OA significantly inhibited phospho-NF-kappa B p65 and its downstream proinflammatory cytokines' expressions, including IL-1 beta, COX-2 and TNF-alpha in testis tissues. Similarly, OA remarkably inhibited IL-1 beta and TNF-alpha production. OA significantly attenuated germ cells' DNA damage and apoptosis. Such changes were accompanied by downregulation of H2AX, p-P53 and Bax expressions, and upregulation of Bcl-2 and Bcl-2/Bax ratio. In addition, OA remarkably inhibited p38 signalling.
Conclusions Oleanolic acid effectively rejuvenates testicular function via attenuating germ cell DNA damage and apoptosis through deactivation of NF-kappa B, p53 and p38 signalling pathways.
[1]China Three Gorges Univ, Coll Med, 8 Univ Ave, Yichang 443002, Peoples R China.
[2]China Three Gorges Univ, RENHE Hosp, Yichang, Peoples R China.
[3]Shanghai Univ Tradit Chinese Med, LONGHUA Hosp, Shanghai 200032, Peoples R China.
(8.0+极速模式)