ABSTRACT
Depressed mood, with its accompanying mental and physical stresses, could affect the progression and severity of several diseases e.g. hypertension, myocardial infarction, gastritis, peptic ulcer. The present animal study was done to investigate the potential antioxidant effect of paroxetine, as a selective serotonin reuptake inhibitor, to protect against chronic restraint stress-induced oxidative damage in the liver. Thirty albino rats were divided into 3 equal groups. Group 1 was control, non-stressed non-treated group. Group 2 was exposed to chronic restraint model by placing them in wire mesh cages exactly fit to their size for 6 hours daily for 21 days. Group 3 were also exposed to chronic restraint model for 21 days while they were administered by paroxetine 1 mg/kg/day ip during the restraint period. At the end of the study, liver transaminases were determined by commercial kits. The hepatic levels of glutathione peroxidase, catalase and thiobarbituric acid reactive substance were also determined by spectrophotometric methods. Glutathione repletion ability by hepatic cells with and without paroxetine treatment was also determined in all tested groups. The results showed a significant (p<0.05) increase in serum levels of transaminases and liver anti-oxidant enzymes while levels of thiobarbituric acid reactive substance were significantly (p<0.05) reduced in paroxetine-treated group compared with non-stressed non-treated control rats. Glutathione repletion ability was also significantly (p<0.05) increased in treated group to a level comparable to the control non-stressed non-treated values.
ABSTRACT
Background: Overiectomized rats suffer from osteoporosis that mainly results from oxidative stress (OS). Studies revealed that the levels of antioxidant enzymes, such as superoxide dismutase (SOD), glutathione peroxidase (GPx), glutathione-S-transferase, catalase (CAT), and glutathione reductase could be used to determine and follow-up OP. The anti-oxidant activity of anti-osteoporotic drugs needs further investigations to be proved to add more confidence in the ability of these drugs to control the disease. Objective: To investigate the possible anti-oxidant effect of treatment with ibandronate, a highly potent nitrogen-containing bisphosphonate, on activities of catalase and glutathione peroxidase anti-oxidant enzymes, thiobarbituric reactive substance (TBARS), as a marker of lipid peroxidation and DEPPD free radicals in liver homogenates of ovariectomized rats. Methods: Fifty adult female albino rats were divided into five equal groups ( n=10 rats): Group (1): served as control injected with saline, 2nd group: rats were subjected to ovariectomy, 3rd group: rats were exposed to ovariectomy and treated with estradiol, 4th group: were ovariectomized and treated with ibandronate and 5th group: were ovariectomized and treated with both estradiol and ibandronate. Duration of therapy with either drug was 12 weeks. Results: Estradiol alone or in combination with ibandronate to ovariectomized rats showed significant increase in activities of anti-oxidant enzymes. Both drugs reduces hepatic TBARS and DEPPD free radicals in hepatic homogenates in this model of OP. Conclusion: The present study can conclude that ovariectomy leading to oxidative changes liver of tested rats. Co-administration of estradiol and ibandronate provides a kind of protection against alterations in anti-oxidative/oxidative balance. The results support the hypothesis stated by experimental studies that anti-osteoporotic treatment could also possess anti-oxidative protective property.