Background: Nephrotoxicity is one of the most important side effects of the use of gentamicin sulphate (GS) resulted in reactive oxygen species generation. Antioxidant compounds played effective roles in reduction of renal injuries caused by using of gentamicin. Carvacrol is a strong antioxidant compound. Objectives: The aim of this study is to explore the effect of carvacrol inhibition in lesions of gentamicin-induced nephrotoxicity. Materials and Methods:In this experimental study, 32 male mature Sprague-Dawley rats were divided into 4 groups of 8; group1: control, group 2 sham received daily carvacrol injection (74 mg/kg) for 12 days, group 3 received daily GS injection (100 mg/kg) for 12 days, group 4 received daily GS (100 mg/kg) and carvacrol (74 mg/kg) for 12 days. After 12 days, rats were anaesthetized, blood sample were obtained and kidneys were removed then stained with hematoxylin and eosin method and then were studied histophatologically. Serum creatinine and urea were measured. Results: Flow treatment of nephrotoxic animals with carvacrol could significantly inhibit leukocyte infiltration (9.42%) and tubular necrosis (38.18%) in comparison with the nephrotoxic untreated group. Carvacrol significantly decreased the levels of urea and creatinine in treated group compared with the nephrotoxic untreated group. Conclusions: The findings showed that carvacrol alleviates loss of leukocyte infiltration (9.42%) and tubular necrosis and exerts beneficial effects on kidney function test in nephrotoxic group.

Background:Sericin, because of its ability to remove free radicals and its antioxidant properties, has been used to successfully cryopreserve various mammalian cell types. However, the effects of sericin on cryopreservation of mouse sperm has not been reported.Objective:The current study intended to determine the protective role of different concentrations of sericin (0, 0.25, 0.5, and 0.75%) on mouse spermatozoa during cryopreservation, in addition to its effect on in vitro fertilization and subsequent embryo development.Materials and Methods: Mouse sperm from epididymides were frozen in cryoprotective agent with 18% raffinose, 3% skim milk, and different concentrations of sericin (0, 0.25, 0.5, 0.75%). Thawed sperm were used for in vitro fertilization. The obtained embryos were cultured in Ksom medium for 6 days. The post-thawed motility, viability, fertilizing ability, and subsequent development to the 2-cell embryo and blastocyst stages were evaluated.Results:Our findings show that frozen-thawed sperm cells with 5% sericin indicate significantly (p≤0.0001) percentages of survivability and motility, the best fertilizing ability, as well as 2-cell embryo and blastocyst development compared to the other treated groups. There was no significant difference in survivability (p=0.8781), fertilizing ability (p=0.2458) and development of 2-cell (p=0.5136) and blastocysts embryos (p=0.0896) between 0.75% sericin and control groups.Conclusion:Supplementation by 0.5% sericin in cryoprotective agent improved frozen-thawed mouse epididymal sperm cell quality and resulted in increased embryo development.