SUMMARY
The aim of this study was to investigate the protective effect of naringenin on oxidative stress, on pro-inflammatory cytokines like TGF-beta1,
IL-1beta and on programmed cell death in the testicular damage resulting from streptozotocin (STZ) induced diabetes in rats. Diabetes was induced by a
single intraperitoneal injection of STZ (50 mg/kg), and the rats were treated with naringenin (5 mg/kg and 10 mg/kg) administered once a day orally
for 10 weeks, starting 3 days after the STZ injection. At the end of the study, all animals were sacrificed. Testis tissue and blood samples were
collected for the assessment of sperm parameters, and for biochemical and histopathological analysis. Naringenin treatment significantly decreased the
levels of elevated tissue TBARS (thio-barbituric acid) and increased the superoxide dismutase (SOD), catalase and glutathione peroxidase (GPx) enzyme
activities in the testis tissues. The naringenin-treated rats in the diabetic group showed an improved histological appearance, sperm parameters, and
serum testosterone levels, along with a decrement of terminal dUTP nick end-labeling (TUNEL) detected program cell death and a reduced over expression
of TGF-beta1, IL-1beta in Sertoli cells and Leydig cells. These results suggest that naringenin is a food supplement potentially beneficial in
reducing testicular damage in diabetic rats by decreasing the oxidative stress related to programmed cell death.
KEY WORDS
diabetes; oxidative stress; naringenin; testis; TGF-beta1; IL-1beta; programmed cell death
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