Grape seed procyanidins extract attenuates Cisplatin-induced oxidative stress and testosterone synthase inhibition in rat testes.

Cisplatin (CIS) is widely applied for its antihematological malignancies properties and as antisolid tumors drugs. However, it could cause testicular damage related with oxidative stress and testosterone synthesis disorder. Studies reported that grape seed procyanidins extract (GSPE) could improve CIS induced-testes lesion via scavenging free radicals in animals, although its mechanisms were unclear. Therefore, the purpose of the present study was to explore the antagonistic mechanisms of GSPE on CIS-induced testes lesion. Rats were treated with 10 mg/kg by weight CIS by intraperitoneal injection singly on the 11th day, and different doses of GSPE were administrated via intragastric gavage for 15 days consecutively. The results showed that GSPE improved the pathological changes of testicular tissue, and the decreased concentrations of testosterone in serum induced by CIS. GSPE inhibited CIS-induced oxidative/nitrative stress, as well as increased the mRNA and protein levels of testosterone synthetase in rat testes. In conclusion, the main protection exerted by GSPE on CIS-induced testicular toxicity is related to its effects including suppressing oxidative/nitrative stress and up-regulating expression of testosterone synthetase.

ABBREVIATIONS: CIS: Cisplatin; GSPE: grape seed procyanidins extract; LH: luteinizing hormone; FSH: follicle-stimulating hormone; STAR: steroidogenic acute regulatory protein; CYP11A1: P450 side chain cleavage enzyme; HSD3B1: 3β-hydroxysteroid dehydrogenase; CYP17A1: 17α-hydroxylase; HSD17B: 17β-hydroxysteroid dehydrogenase; ROS: reactive oxygen species; O2- : superoxide anion; H2 O2 : hydrogen peroxide; •OH: hydroxyl radicals; SOD: superoxide dismutase; CAT: catalase; GSH-Px: glutathione peroxidase; LPO: lipid peroxidation; 8-OHdG: 8-hydroxy-2-deoxyguanosine; HO-1: heme oxygenase-1; MT-1: metallothionein-1; NO: nitric oxide; ONOO-: peroxynitrite; NOS: nitric oxide synthases; nNOS: neuronal NOS; iNOS: inducible NOS; eNOS: endothelial NOS; MDA: malondialdehyde; GSH: glutathione; T-AOC: total antioxidant capacity; TNOS: total nitric oxide synthases; Lhcgr: luteinizing hormone receptor; Scarb1: lipoprotein-receptor; Cyp19a1: 19α-hydroxylase; ELISA: enzyme linked immunosorbent assay; RT-qPCR: reverse transcription-quantitative polymerase chain reaction; PAS: periodic acid-Schiff; MTs: Metallothioneins; cAMP: cyclic adenosine monophosphate; cDNA: complementary DNA; RIPA: radioimmunoprecipitation buffer; PMSF: phenylmethanesulfonyl fluoride; PVDF: polyvinylidenedifluoride; β-actin: beta-actin.