Antioxidant Enzyme Activities In Rats Research Articles

Modulatory effects of Cannabis sativa co-administration with tramadol and codeine on cognitive function in male rats

Most teenagers mix up various psychoactive cocktail substances in combinations to get intoxicated. The role of the mixture combination of codeine (CDE), tramadol (TMD), and Cannabis sativa (CNB) on brain cognition, purinergic, cholinergic, and antioxidant enzyme activities remains unknown. This study sought to assess the mechanism of action of combinations of CDE+ TMD+ CNB on the function and activities of the brain of male Wistar rats. Forty-eight male Wistar rats were divided into 8 groups, n = 6. Group 1 served as a control, groups 2, 3, and 4 were exposed to CDE (2 mg/kg bw), TMD (10 mg/kg bw), and CNB (200 mg/kg bw), while groups 5, 6, 7, and 8 were co-administered with CDE+TMD, CNB+ TMD, CNB+CDE, and CNB+TMD+CDE orally for 28 days. This study revealed the effect of prolonged administration of CNB, TMD, and CDE on the suppression of cognitive function, acetyl-cholinesterase (AChE), butyl-cholinesterase (BChE), monoamine oxidase (MAO) enzyme activities, and antioxidant enzyme activities in rats’ brains when compared against control rats (P < 0.05). However, the activities of ectonucleosides (NTPdase), adenosine deaminase (ADA), and malondialdehyde levels produced in the brain of rats were significantly elevated (P < 0.05). This study reported the mechanism behind the neurotoxicity of CNB, TMD, and CDE on rats’ cognitive, cholinergic, purinergic, and antioxidant enzymes as a consequence of the drastic reduction in cholinesterase enzyme activities leading to neurotransmitter poisoning.

Chitosan Nanoparticles Alleviated the Adverse Effects of Sildenafil on the Oxidative Stress Markers and Antioxidant Enzyme Activities in Rats.

Sildenafil (SF) is widely used for erectile dysfunction and other conditions, though with limitations regarding oral absorption and adverse effects. Despite nanotechnological improvements, the effect of nanocarriers on SF hepatotoxicity has not been documented to date. This study aimed at assessing the impact of chitosan nanoparticles either uncoated (CS NPs) or Tween 80-coated (T-CS NPs) on the effects of SF on oxidative stress markers and antioxidant enzyme activities in rats. Test SF-CS NPs prepared by ionic gelation were uniform positively charged nanospheres (diameter 178-215 nm). SF was administered intraperitoneally to male rats (1.5 mg/kg body weight) in free or nanoencapsulated forms as SF-CS NPs and T-SF-CS NPs for 3 weeks. Free SF significantly suppressed the activity of the antioxidant enzymes glutathione S-transferase (GST), glutathione peroxidase (GPx), glutathione reductase (GR), catalase (CAT), and superoxide dismutase (SOD), as well as the levels of glutathione (GSH) and thiobarbituric acid reactive substances (TBARS) as in an indirect measure of free radicals. Interestingly, SF-CS NPs and T-SF-CS-NPs treatments significantly attenuated the inhibitory effects of SF on the activity of these enzymes whereas, GST activity was inhibited. Moreover, the protein expression of GST was downregulated upon treatment of rats with free SF, SF-CS-NPs, and T-SF CS-NPs. In contrast, the activity and protein expression of GPx was induced by SF-CS NPs and T-SF-CS-NPs treatments. The histopathological study showed that SF induced multiple adverse effects on the rat liver architecture which were markedly suppressed particularly by T-SF-CS NPs. In conclusion, chitosan nanoencapsulation of SF counteracted the adverse effects of SF on the activity of antioxidant enzymes and liver architecture. Findings might have significant implications in improving the safety and efficacy of SF treatment of the widely expanding disease conditions.

Melatonin Attenuates Methotrexate-Induced Reduction of Antioxidant Activity Related to Decreases of Neurogenesis in Adult Rat Hippocampus and Prefrontal Cortex.

Previous studies have revealed that the side effects of anticancer drugs induce a decrease of neurogenesis. Methotrexate (MTX), one of anticancer drugs, can induce lipid peroxidation as an indicator of oxidative stress in the brain. Melatonin has been presented as an antioxidant that can prevent oxidative stress-induced neuronal damage via the activation of antioxidant enzymes associated with the increase of neurogenesis. The aims of the present study are to examine the neuroprotective effect of melatonin on the neurotoxicity of MTX on neurogenesis and the changes of protein expression and antioxidant enzyme levels in adult rat hippocampus and prefrontal cortex (PFC). Male Sprague-Dawley rats were assigned into four groups: vehicle, MTX, melatonin, and melatonin+MTX groups. The vehicle group received saline solution and 10% ethanol solution, whereas the experimental groups received MTX (75 mg/kg, i.v.) and melatonin (8 mg/kg, i.p.) treatments. After the animal examination, the brains were removed for p21 immunofluorescence staining. The hippocampus and PFC were harvested for Western blot analysis and biochemical assessments of malondialdehyde (MDA), catalase (CAT), glutathione peroxidase (GPX), and superoxide dismutase (SOD). The immunofluorescence result showed that coadministration with melatonin diminished p21-positive cells in the hippocampal dentate gyrus, indicating a decrease of cell cycle arrest. Melatonin reduced the levels of MDA and prevented the decline of antioxidant enzyme activities in rats receiving MTX. In the melatonin+MTX group, the protein expression results showed that melatonin treatment significantly upregulated synaptic plasticity and an immature neuron marker through enhancing brain derived neurotrophic factor (BDNF) and doublecortin (DCX), respectively. Moreover, melatonin ameliorated the antioxidant defense system by improving the nuclear factor erythroid 2-related factor 2 (Nrf2) in rats receiving MTX. These findings suggested that the effects of melatonin can ameliorate MTX toxicity by several mechanisms, including an increase of endogenous antioxidants and neurogenesis in adult rat hippocampus and PFC.

The Effect of Hydroethanolic Extract of Pomegranate Peels and High-intense Interval Training on C-reactive Protein, Catalase and Superoxide Dismutase in Rats

Aims: Heavy exercise can damage the immune system by oxidative stress. The role of herbal supplements during and after strenuous exercise is unknown. Therefore, the present study aimed to determine hydroethanolic extract of pomegranate peels and a period of high-intensity interval training on the C-reactive protein and antioxidant enzyme activity in rats. Methods &amp; Materials: This research was an experimental study. The statistical population was rats, of which 36 Wistar rats were randomly selected and were divided into 4 groups (control, hydroethanolic extract of pomegranate peels, high-intensity interval training, and hydroethanolic extract of pomegranate peels + high-intensity interval training). After 8 weeks of interval training and supplementation, blood samples were taken from the rats. Then, the C-reactive protein and the activity of the antioxidant enzymes of superoxide dismutase and catalase were assessed by 1-way analysis of variance. Findings: The results showed that in the group of hydroethanolic extract of pomegranate peels + high-intensity interval training, the superoxide dismutase (P=0.000) and catalase (P=0.003) significantly increased, and the C-reactive protein (P=0.002) decreased. Tukey’s test confirmed the significance of these changes in the hydroethanolic extract of pomegranate peels+high-intensity interval training compared to the control group. Conclusion: The combination of high-intensity interval training and hydroethanolic extract of pomegranate peels could strengthen the immune system, potentially enhances athletic performance, and accelerates recovery after exercises. The hydroethanolic extract of pomegranate peels and high-interval training synergistically boost the immune system and increase physical endurance.

Effects of Green Tea and Black Tea Supplementation on Serum Lipids and Antioxidant Enzyme Activity in Rats on a High Fat Diet

본 연구에서 고지방식이를 섭취한 성장기 암컷 쥐를 대상으로 녹차 및 홍차 첨가식이가 혈중 지질 농도와 항산화 효소 활성에 미치는 영향을 분석하였다. 그 결과 체중 증가량은 실험식이에 따른 유의적인 차이가 없었으나 식이효율은 고지방군이 대조군보다 유의적으로 높았다. 혈중 중성지방 농도와 동맥경화지수는 고지방홍차군이 고지방 대조군보다 유의적으로 낮았다. 혈중 총콜레스테롤과 LDL-콜레스테롤 농도는 식이군 간에 차이가 없었고, 혈중 HDL-콜레스테롤 농도는 고지방 대조군이 대조군보다 유의적으로 낮았으나 고지방 녹차군과 고지방 홍차군은 유의적인 차이가 없었다. 간의 총콜레스테롤과 중성지방 함량은 고지방식이군 간에 유의적인 차이가 없었다. 간 조직의 MDA 함량은 고지방 녹차군과 고지방 홍차군이 대조군보다 유의적으로 낮았다. 간 조직의 CAT 활성은 고지방 홍차군이 고지방 대조군에 비하여 유의적으로 높았고, 간 조직의 SOD 활성, GSH-Px 활성은 식이군 간에 유의적인 차이가 없었다. 결론적으로 고지방식이를 섭취한 성장기 암컷 쥐에게 녹차와 홍차를 섭취시켰을 때, 고지방 홍차군은 혈중 중성지방과 동맥경화지수가 고지방 대조군에 비해서 유의적으로 낮았고, 간 조직의 CAT 활성은 유의적으로 높았으며, 간 조직의 MDA 함량은 녹차군과 홍차군이 대조군보다 유의적으로 낮아 차의 섭취는 혈중 지질 개선과 항산화 효소 활성에 유리한 것으로 나타났다.

Effect of Moxifloxacin and Role of Vitamin (E) on Antioxidant Enzymes Activity in Rats

Our investigation was carried out to assess the protective impact beside the antioxidant role of vitamin E on Moxifloxacin's possible adverse effects. Collection of blood samples at 1st, 7th, 14th, 21st days after treatment. Collection of tissue samples at 7th and 14th days after treatment to evaluate the protective effect of Vit. E. Our results showed (day 14moxifloxacin): multifocal hepatic necrosis of variable sizes, partially replaced by macrophages occasionally with giant cells formation. The hepatic blood vessels were moderately congested and the bile ducts were proliferated with characteristic portal round cells aggregation and portal fibrosis. Examined sections from kidney showed cystic dilatation of few tubules in the medulla and cortex. The renal pelvis revealed focal sloughing and hyperplasic changes in the transitional epithelium. Focal interstitial and perivascular aggregation of round cells and eosinophils were observed. The renal blood vessels were mildly congested. Day 14 moxifloxacin and Vit. E: sections showed normal hepatic parenchyma with residual portal biliary proliferation and fibrosis. Minute focal hepatic necrotic areas partially replaced by round cells were also seen. Also showing apparently normal nephron units with mild degenerative changes in some tubular epithelium and cyst dilatation in some renal tubules. Therefore, Vitamin E should be taken with moxifloxacin to decrease its adverse effects.

Effect of dietary inclusion of pumpkin (Cucurbita pepo L) seed on nephrotoxicity occasioned by cisplatin in experimental rats.

The study evaluated the effect of dietary inclusion of pumpkin (Cucurbita pepo L) seed (raw and roasted) on nephrotoxicity caused by cisplatin in rats. Rats were divided into control group, cisplatin-induced nephrotoxic untreated group, nephrotoxic-treated groups with Methimazole, dietary regimen containing raw pumpkin seed (5% and 10%) and roasted pumpkin seed (5% and 10%) for 14 days. Results acquired uncovered that cisplatin intoxication significantly increased (p≤.05) the levels of renal biomarkers, arginase activity, 8-hydroxy-21-deoxy guanosine (8-OHdG), malondialdehyde (MDA), and reactive oxygen species (ROS) levels as well as significant decrease in functional sulfhydryl groups, nitric oxide levels, and antioxidant enzyme activities in rats' kidney when compared to the control group. These adverse changes, due to cisplatin inebriation in rodents, were in any case, forestalled by pre-treatment with pumpkin seed inclusive diet. This holds promise for the use of pumpkin seed as a food supplement in the management of nephrotoxic-related disorders. PRACTICAL APPLICATIONS: These results suggest that roasted pumpkin seed appears to be more nephroprotective than the raw pumpkin seed through regulations of arginase activity, enhancement in the antioxidant system, suppression of renal markers and lipid peroxidation. This holds p-omise for the use of roasted pumpkin seed as a food supplement in the management nephrotoxic-related disorders.

Dietary flaxseed oil inhibits kidney NF-kappa B activation and pro-inflammatory cytokine expression in cisplatin-treated rats

The current study explores the anti-inflammatory effect of flaxseed oil (FXO) on cisplatin (CP)-induced renal damage. Rats prefed with normal experimental diets (normal/FXO diet) for 10 days were administered 30 mg kg−1 and 50 mg kg−1 i.p. CP in a single dose, while still on the experimental diets. Significant improvement in kidney function test and antioxidant enzyme activities in rats treated with combination therapy (FXO + CP) was detected. Interestingly, treatment by FXO resulted in significant downregulation (P < 0.05) in interleukin (IL)-6 and IL-1β expression in the renal tissue in comparison with CP-treated rats. Moreover, administration of FXO yielding negative and mild positive brown immunostain for tumor necrosis factor-alpha (TNF-α) or mild and moderate positive brown immunostain for nuclear factor Kappa B (NF-kB) in the renal tissue of rats treated with 3 mg kg−1 CP + FXO and 5 mg kg−1 CP + FXO, respectively. The obtained results highlight the ameliorative anti-inflammatory effect of FXO in the renal damage associated with CP administration and confirm the necessity and usefulness of FXO dietary supplement when using CP in the treatment of cancer patients.

Effects of Extracts of Agrimonia Asiatica and Geranium Collinum on Lipid Peroxidation and the Blood Antioxidant Enzyme Activity in Rats with Alloxan Diabetes

The effects of 70% ethanolic extracts of the above-ground parts of Agrimonia asiatica Juz. (D1) and the roots of Geranium collinum Steph. (D2) on lipid peroxidation (LPO) and the plasma and erythrocyte levels of activity of the antioxidant enzymes superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GP), and glutathione reductase (GR) were studied in rats with alloxan-induced diabetes. Significant decreases in erythrocyte membrane LPO (by 51-80%) were seen with D1 and D2. Extract D1 induced plasma SOD activity (by factors of 1.6 – 2.6) and erythrocyte CAT (by factors of 1.6-2.3). D2 induced SOD activity (by factors of 1.5 – 1.8), CAT activity (by factors of 1.9 – 2.7), and GR activity (by factors of 1.4 – 1.9) in erythrocytes. Both substrates, D1 and D2, showed statistically significant suppression of plasma GR activity (by 7 – 18%) and countered an alloxan-induced increase in erythrocyte GP activity (by 20 – 60%).

Prevention of H2O2 Induced Oxidative Damages of Rat Testis by Thymus algeriensis

ObjectiveWe evaluate the effects of Thymus algeriensis (TEO) against hydrogen peroxide (H2O2) toxicity on body and testis weight, testis sperm count, testis lipid peroxidation, and antioxidant enzyme activities in rats. MethodsRats were treated with low (LD) and high dose (HD) of H2O2 (0.1 and 1 mmol/L) in the presence or absence of TEO (150 mg/kg). ResultsThe results exhibited a significant decrease in body weight and testis weight, in total sperm number decrease (P<0.05), sperm motility and percentage of sperm viability, leading to complete arrest, in sperm flagellar beat frequency by the gavage of 1 mmol/L H2O2 compared to controls. The administration of H2O2 resulted in a significant reduction in testis GSH, GPx, CAT, SOD, and GST activity and significant increase (P<0.05) in MDA concentration compared with the untreated control animals. TEO pre-treatment protected testis from the H2O2 generated oxidative stress. These results were confirmed by histological architecture examinations. ConclusionH2O2 has the ability to alter the sperm function, characteristics and development of testis. However, TEO is an efficient natural agent, which can prevent the testis from H2O2-induced oxidative damage in rats.

Superoxide dismutase and catalase activities in the retina during experimental diabetes and electric stimulation of the paleocerebellar cortex.

In 1.5 months after modeling of streptozotocin-induced diabetes mellitus, superoxide dismutase and catalase activities decreased by 40.7 and 32.0%, respectively, in comparison with the corresponding values in Wistar rats without diabetes. Electric stimulations (100 Hz, 0.25 msec, 50-100 μA, 2.5 sec) of the paleocerebellar cortex (V-VII lobules) were conducted 3 times a day over 1 month. These stimulations prevented the decrease in antioxidant enzyme activity in rats with experimental diabetes.

Effect of a synthetic indolicidin analogue on lipid peroxidation in thermal burns.

Experimental simulation of burn was followed by accumulation of LPO products and suppression of antioxidant enzyme activity in the burn wound. Application of a synthetic analogue of indolicidin led to an increase in MDA and acylhydroperoxide concentrations in the burn wound on experimental day 1. Further application of the peptide in a dose of 100 mg/kg had no significant effect on the studied parameters, while the peptide in a dose of 500 mg/kg was followed by a decrease in the level of LPO products on days 10 and 14. Changes in antioxidant enzyme activities in rats treated with 500 mg/kg indolicidin analogue had a two-phase pattern: an increase on day 4 was followed by a decrease.

The pecan nut (Carya illinoinensis) and its oil and polyphenolic fractions differentially modulate lipid metabolism and the antioxidant enzyme activities in rats fed high-fat diets

Tree nuts such as pecans (Carya illinoinensis) contain mostly oil but are also a source of polyphenols. Nut consumption has been linked to a reduction in serum lipid levels and oxidative stress. These effects have been attributed to the oil while overlooking the potential contribution of the polyphenols. Because the evidence regarding each fraction’s bioactivity is scarce, we administered high-fat (HF) diets to male Wistar rats, supplementing them with pecan oil (HF+PO), pecan polyphenols (HF+PP) or whole pecans (HF+WP), and analysed the effects of each fraction. The HF diet increased the serum leptin and total cholesterol (TC) with respect to the control levels. The HF+WP diet prevented hyperleptinemia and decreased the TC compared with the control. The HF+WP diet upregulated the hepatic expression of apolipoprotein B and LDL receptor mRNAs with respect to the HF levels. The HF+PO diet reduced the level of triacylglycerols compared with the control. The HF+PP diet stimulated the hepatic expression of liver X receptor alpha mRNA. The HF+WP diet increased the activities of hepatic catalase, glutathione peroxidase and glutathione S transferase compared with the control, and decreased the degree of lipid peroxidation compared with the HF diet. The most bioactive diet was the WP diet.

청국장 식이와 유산소 운동이 흰쥐의 지질대사 및 항산화효소에 미치는 영향

생후 4주령 Sprague Dawley계 수컷 흰쥐를 분양 받아 청국장식이유산소운동군 8마리, 청국장식이군 8마리, 유산소운동군 8마리, 대조군 8마리, 총 32마리를 대상으로 구분하였다. 운동은 6주간, 주 5회, 경사도 0%, 속도 15~16 m/min으로 하고, 1주차 25분, 2~3주차 30분, 4~5주차 35분, 6주차 40분이 되도록 실시하였고, 청국장은 20% 청국장 첨가식이를 1일 20 g 기준으로 섭취시킨 결과는 다음과 같다. 청국장 식이와 유산소 운동은 혈중지질중 T-C, TG, HDL-C에서 긍정적인 효과가 나타났고, 항산화효소 중 SOD에서 긍정적인 효과가 나타났다. 이는 유산소 운동의 혈중지질의 개선, 항산화 효과와 청국장에 함유된 레시틴(lecithin), 사포닌(saponin), 글라이시틴(glycitin), 파이틱산(phytic acid) 등의 성분들의 시너지 작용으로 긍정적인 영향을 미친 것으로 사료된다. 그러나 LDL-C, TBARS, CAT, GPx의 차이는 나타나지 않았다. 차후 연구에서 운동강도, 빈도, 지속시간과 청국장의 섭취량 등에 변화를 준 다각적 연구가 필요할 것으로 사료된다. The purpose of this study was to examine the effects of a cheonggukjang diet and aerobic exercise on lipid metabolism and antioxidant enzyme activity in rats. Thirty-two Sprague Dawley rats were randomized into a cheonggukjang diet with aerobic exercise (A), aerobic exercise (B), cheonggukjang diet (C), and control group (D). The cheonggukjang diet group consumed 20 g of 20% cheonggukjang a day with their normal diet. Exercise training consisted of treadmill running (25~40 min, 5 day/wk) and the exercise intensity was gradually increased. The results are as follows: T-C was significantly lower (p<0.05) in A compared to B and C. TG was significantly lower (p<0.001) in A compared to D. B and C were significantly lower than D. HDL-C was significantly higher (p<0.05) in C compared to D. LDL-C was not statistically different across the groups. Additionally, TBARS were not statistically different in the control or experimental groups. SOD was significantly lower (p<0.05) in A compared to D. C was significantly lower (p<0.05) that of D. CAT and GPx failed to reach the statistical difference between experimental and control groups. The major findings of this study were that aerobic exercise with a chenggukjang diet intervention improved lipid profiles and antioxidant capacity in this animal model. Therefore, a cheonggukjang diet and aerobic exercise will help to improve antioxidant capacity and prevent lifestyle related diseases.

Alteration of lipid status and lipid metabolism, induction of oxidative stress and lipid peroxidation by 2,4-dichlorophenoxyacetic herbicide in rat liver

This study aims to investigate the effects of the 2,4-dichlorophenoxyacetic herbicide (2,4-D) on plasma lipids, lipoproteins concentrations, hepatic lipid peroxidation, fatty acid composition and antioxidant enzyme activities in rats. Animals were randomly divided into four groups of 10 each: control group and three 2,4-D-treated groups G1, G2 and G3 were administered 15, 75 and 150 mg/kg/BW/d 2,4-D by gavage for 28 d, respectively. Results showed that 2,4-D caused significant negative changes in the biochemical parameters investigated. The malondialdehyde level was significantly increased in 2,4-D-treated groups. Fatty acid composition of the liver was also significantly changed with 2,4-D exposure. Furthermore, the hepatic antioxidant enzyme activities were significantly affected. Finally, 2,4-D at the studied doses modifies lipidic status, disrupt lipid metabolism and induce hepatic oxidative stress. In conclusion, at higher doses, 2,4-D may play an important role in the development of vascular disease via metabolic disorder of lipoproteins, lipid peroxidation and oxidative stress.

홍마늘 복합물이 고지방-콜레스테롤 식이성 흰쥐의 분변 지질 함량 및 간 조직의 항산화 효소 활성에 미치는 영향

This study was performed to investigate the effects of the hot water extract of red garlic (RG) and RG-composites on fecal lipid levels and hepatic antioxidant enzyme activity in rats fed a high fat-cholesterol diet. Three different types of RG-composites prepared: RG and green tea (RGT), RG and dietary fiber (RGF), and RG, green tea, and dietary fiber (RGTF). Rats were divided into six groups: the control, the group fed a high fat-cholesterol diet (HFC), the RG-supplemented group (HRG), the RGT supplemented group (HRGT), the RGF supplemented group (HRGF), and the RGTF supplemented with HFC group (HRGTF). The antioxidant activity of these composites was tested, in vitro. The DPPH radical scavenging activity was higher RGT and RGTF than RG. ABTs radical scavenging activity of RGT was similar to RGTF. Their activities were significantly higher than RG. The reducing power was similar to their radical scavenging activities. Total lipid levels in the liver and triglyceride levels in the heart were lower in the groups fed RG-composites than the HRG group. Fecal total lipid level was higher in the HRGF and HRGTF groups than the HRG group after 4 weeks diet supplementation during 4 weeks. Lipid peroxide content was reduced to anywhere between 6.2% and 12.1% in the groups fed RG-composites, compared to the HFC group. Antioxidant activity was significantly higher in the groups fed RG-composites than the HFC group. Hepatic SOD activity was higher in the groups fed RG-composites than the HRG group. The HRGT group in catalase activity, and the HRGT and HRGTF groups in GSH-px activity were increased significantly compared to the HFC group. Hepatic UDPGT activity was increased significantly in the HRGT and HRGTF groups to the HFC group, as well. These results indicate that antioxidant activities of the RG-composites were related to the decrease of lipid levels by increasing the fecal excretion and enhancement of hepatic antioxidant enzyme activity in rats fed a high fat-cholesterol diet.

Experimental study on the effect of vitamin C administration on lipid peroxidation and antioxidant enzyme activity in rats exposed to chlorpyriphos and lead acetate

Aim : To evaluate the effects of chlorpyriphos, lead acetate, vitamin C alone, and in combination on the activity of oxidative stress parameters in wistar rats. Marerial and Methods: Rats of 150-200g body weight were divided into eight groups of six animals each and were subjected to various daily oral treatment regimes for 98 days. Group I served as control receiving only corn oil, group II received th chlorpyriphos @ 5.5 mg/ kg in corn oil, group III received lead acetate @100 ppm in water, whereas animals in group IV th received a combination of chlorpyriphos @ 5.5mg/kg in corn oil and lead acetate @ 100 ppm in water. Group V received th vitamin C @ 100mg/kg in water, group VI received a combination of chlorpyriphos @ 5.5mg/kg and vitamin C @ th th 100mg/kg , group VII received lead acetate @ 100 ppm in water and vitamin C @ 100mg/kg and group VIII received chlorpyriphos @ 5.5mg/kg , lead acetate @100ppm in water and vitamin C @ 100mg/kg. Results: Administration of both chlorpyriphos and lead acetate caused a significant decrease in oxidative stress parameters viz. blood glutathione, catalase, superoxide dismutase (SOD), glutathione peroxidase (GPx), glutathione-s-transferase (GST) along with a significant increase in lipid peroxidation level when given alone or in combination. Conclusions: The study demonstrated that treatment of chlorpyriphos and lead treated rats with vitamin C significantly improved some of altered oxidative stress parameters revealing the protective effect of this vitamin C against oxidative stress induced by chlorpyriphos and lead.

Oleuropein prevents ethanol-induced gastric ulcers via elevation of antioxidant enzyme activities in rats

Purified oleuropein from olive leaf extract has been shown to have antioxidant effects in our recent studies. Thus, the aim of this study was to assess the antioxidant abilities of oleuropein in comparison with ranitidine in ethanol-induced gastric damages via evaluation of ulcer index inhibition, antioxidant enzyme activities, and lipid peroxidation level. Fifty-six adult male Sprague-Dawley rats were divided into seven equal groups as follows: control group, ethanol group (absolute ethanol 1 ml/rat), oleuropein group (12 mg/kg), and oleuropein (6, 12, and 18 mg/kg) plus ethanol groups, as well as ranitidine (50 mg/kg) plus ethanol group. Pretreatment with oleuropein (12 and 18 mg/kg) significantly increased the ulcer index inhibition (percent), in comparison with oleuropein (6 mg/kg). Glutathione peroxidase (GPx) activity was significantly lower in the ethanol group when compared with the other groups whereas, treatment of rats with oleuropein (12 mg/kg) significantly increased glutathione content in gastric tissue when compared with the other groups, and lipid peroxidation was significantly reduced in the oleuropein- (12 and 18 mg/kg) and ranitidine-treated animals. Superoxide dismutase (SOD) and catalase (CAT) activities were both much higher in oleuropein-treated rats than the ethanol group, and although there was a moderate increase in SOD and CAT activities in ranitidine-treated rats, the differences were not significant. These findings suggest that oleuropein has beneficial antioxidant properties against ethanol-induced gastric damages in the rat. Therefore, it seems that a combination regimen including both antioxidant and antisecretory drugs may be beneficial in prevention of ethanol-mediated gastric mucosal damages.

Soy protein supports cardiovascular health by downregulating hydroxymethylglutaryl–coenzyme A reductase and sterol regulatory element-binding protein–2 and increasing antioxidant enzyme activity in rats with dextran sodium sulfate–induced mild systemic inflammation

Animal and human studies have indicated that the presence of soy in the diet improves cardiovascular health. Inflammation plays a pivotal role in the progression of cardiovascular disease (CVD). However, little is known about how dextran sodium sulfate (DSS)-induced systemic inflammation impacts overall heart health and, correspondingly, how soy protein modulates risk of CVD development in DSS-induced systemic inflammation. We hypothesized that soy protein-fed rats would have a lower risk of CVD by beneficial alteration of gene expression involving lipid metabolism and antioxidant capacity in DSS-induced systemic inflammation. Forty Sprague-Dawley rats were divided into 4 groups: casein, casein + DSS, soy protein, and soy protein + DSS. After 26 days, inflammation was induced in one group from each diet by incorporating 3% DSS in drinking water for 48 hours. Soy protein-fed rats had lower final body weights (P = .010), epididymal fat weights (P = .049), total cholesterol (P < .001), and low-density lipoprotein cholesterol (P < .001). In regard to gene expression, soy protein-fed rats had lower sterol regulatory element-binding protein-2 (P = .032) and hydroxymethylglutaryl-coenzyme A reductase (P = .028) levels and higher low-density lipoprotein receptor levels (P = .036). Antioxidant enzyme activity of superoxide dismutase and catalase was higher among the soy protein groups (P = .037 and P = .002, respectively). These results suggest that soy protein positively influences cardiovascular health by regulating serum lipids through modified expression of sterol regulatory element-binding protein-2 and its downstream genes (ie, hydroxymethylglutaryl-coenzyme A reductase and low-density lipoprotein receptor) and by promoting the antioxidant enzyme activity of superoxide dismutase and catalase.

Effects of Lycium Barbarum Aqueous and Ethanol Extracts on High-Fat-Diet Induced Oxidative Stress in Rat Liver Tissue

This study evaluated the protective effects of aqueous extract of Lycium barbarum (LBAE) and ethanol extract of Lycium barbarum (LBEE) on blood lipid levels, serum alanine aminotransferase (ALT), aspartate aminotransferase (AST), alkaline phosphatase (ALP) activities and liver tissue antioxidant enzyme activities in rats fed a high fat diet (HF). The rats were randomly divided into seven groups of ten rats each and fed a different diet for eight weeks as follows: One group (NC group) was fed a standard diet, one group was fed a high-fat diet (HF group), one group was fed a high-fat diet and orally fed with 20 mg/kg b.w. simvastatin (HF + simvastatin group), and the other group was fed the high fat diet and orally fed with 50 mg/kg b.w. or 100 mg/kg b.w. LBAE (HF + LBAE), or 50 mg/kg b.w. or 100 mg/kg b.w. LBEE (HF + LBEE), respectively. After eight weeks, the HF diet caused deleterious metabolic effects. Rats fed the HF diet alone showed increased hepatocellular enzyme activities in plasma, a significant decline in antioxidant enzyme activities, and elevated liver lipid peroxidation indices. LBAE and LBEE administration significantly reduced liver damage and oxidative changes, and brought back the antioxidants and lipids towards normal levels. These data suggest that these antioxidants protect against toxicity parameters in HF rats.