共查询到19条相似文献，搜索用时 281 毫秒
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用高脂饲料喂养健康成年大鼠3个月,诱发高脂血症的同时,分别加入不同剂量的三七,观察其对抗氧化作用的影响,研究三七对高脂血症大鼠抗氧化作用的影响。 相似文献
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Singh PP Chandra A Mahdi F Roy A Sharma P 《Indian journal of clinical biochemistry : IJCB》2010,25(3):225-243
The antioxidants are essential molecules in human system but are not miracle molecules. They are neither performance enhancers
nor can prevent or cure diseases when taken in excess. Their supplemental value is debateable. In fact, many high quality
clinical trials on antioxidant supplement have shown no effect or adverse outcomes ranging from morbidity to all cause mortality.
Several Chochrane Meta-analysis and Markov Model techniques, which are presently best available statistical models to derive
conclusive answers for comparing large number of trials, support these claims. Nevertheless none of these statistical techniques
are flawless. Hence, more efforts are needed to develop perfect statistical model to analyze the pooled data and further double
blind, placebo controlled interventional clinical trials, which are gold standard, should be implicitly conducted to get explicit
answers. Superoxide dismutase (SOD), glutathione peroxidase and catalase are termed as primary antioxidants as these scavenge
superoxide anion and hydrogen peroxide. All these three enzymes are inducible enzymes, thereby inherently meaning that body
increases or decreases their activity as per requirement. Hence there is no need to attempt to manipulate their activity nor
have such efforts been clinically useful. SOD administration has been tried in some conditions especially in cancer and myocardial
infarction but has largely failed, probably because SOD is a large molecule and can not cross cell membrane. The dietary antioxidants,
including nutrient antioxidants are chain breaking antioxidants and in tandem with enzyme antioxidants temper the reactive
oxygen species (ROS) and reactive nitrogen species (RNS) within physiological limits. Since body is able to regulate its own
requirements of enzyme antioxidants, the diet must provide adequate quantity of non-enzymic antioxidants to meet the normal
requirements and provide protection in exigent condition. So far, there is no evidence that human tissues ever experience
the torrent of reactive species and that in chronic conditions with mildly enhanced generation of reactive species, the body
can meet them squarely if antioxidants defense system in tissues is biochemically optimized. We are not yet certain about
optimal levels of antioxidants in tissues. Two ways have been used to assess them: first by dietary intake and second by measuring
plasma levels. Lately determination of plasma/serum level of antioxidants is considered better index for diagnostic and prognostic
purposes. The recommended levels for vitamin A, E and C and beta carotene are 2.2–2.8 μmol/l; 27.5–30 μmol/l; 40–50 μmol/l
and 0.4–0.5 μmol/l, respectively. The requirement and recommended blood levels of other dietary antioxidants are not established.
The resolved issues are (1) essential to scavenge excess of radical species (2) participants in redox homeostasis (3) selective
antioxidants activity against radical species (4) there is no universal antioxidant and 5) therapeutic value in case of deficiency.
The overarching issues are (1) therapeutic value as adjuvant therapy in management of diseases (2) supplemental value in developing
population (3) selective interactivity of antioxidant in different tissues and on different substrates (4) quantitative contribution
in redox balance (5) mechanisms of adverse action on excess supplementation (6) advantages and disadvantages of prooxidant
behavior of antioxidants (7) behavior in cohorts with polymorphic differences (8) interaction and intervention in radiotherapy,
diabetes and diabetic complications and cardiovascular diseases (9) preventive behavior in neurological disorders (10) benefits
of non-nutrient dietary antioxidants (11) markers to assess optimized antioxidants status (12) assessment of benefits of supplementation
in alcoholics and heavy smokers. The unresolved and intriguing issues are (1) many compounds such as vitamin A and many others
possessing both antioxidant and non-antioxidant properties contribute to both the activities in vivo or exclusively only to
non-antioxidant activity and (2) since human tissues do not experience the surge of FR, whether there is any need to develop
stronger synthetic antioxidants. Theoretically such antioxidants may do more harm than good. 相似文献
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Pradeep Venkatesh Garg Satpal Lalit Verma Tewari Hem Kumar Sheena Garg 《Indian journal of clinical biochemistry : IJCB》2001,16(1):9-14
Antioxidants are a small group of substances that protect living cells from the destructive consequences of powerful oxidizing
intermediates that can be formed from oxygen. Situations in which pro-oxidant mechanisms within the body are more active than
the antioxidant mechanisms (oxidative stress) predispose and contribute to the pathogenesis of several ailments in various
organs of the body. In the eye, pro-oxidant factors have been blamed for the causation of diseases such as age related macular
degeneration and senile cataract. The role of pro-oxidants in the genesis of certain diseases is well established however,
the effectivity of antioxidants provided to the body by dietary supplementation is inconclusive. In this article we provide
a review on the basic concepts of antioxidant-pro-oxidant interaction in relation to its effects on the eye. 相似文献
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S. B. Patil M. V. Kodliwadmath Sheela M. Kodliwadmath 《Indian journal of clinical biochemistry : IJCB》2007,22(1):135-137
Pregnancy is a physiological state accompanied by a high-energy demand and an increased oxygen requirement. Augmented levels
of oxidative stress would be expected because of the increased intake and utilization of oxygen. Evidence of increased oxidative
stress in normal pregnancy in comparison with nonpregnant controls was estimated by measuring Thiobarbituric acid reactive
substance (TBARS), enzymatic antioxidants like Superoxide dismutase, Glutathione peroxidase, Glutathione reductase and catalase.
It was observed that pregnant women were more susceptible to oxidative damage than non-pregnants as indicated by increased
TBARS and decreased antioxidants. 相似文献
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Hepatocellular carcinoma (HCC) is one of the commonest tumors worldwide. The treatment of HCC is vital for disease diagnosis and prognosis, as the liver is the most important organ controlling metabolic functions. Now-a-days, western folklore medicines are largely dependent on the phyto compounds which are highly effective in therapy and with low side effects. Luteolin is a flavonoid (3,4,5,7-Tetrahydro flavones) possess anti-inflammatory, anticancer and anti allergic property. The present study evaluates the efficacy of luteolin against N-nitrosodiethylamine (DEN) induced HCC in albino rats. In the highlight of the above, luteolin was evaluated for its efficacy against DEN induced HCC in male Wistar albino rats. The Biochemical parameters such as tissue damaging enzymes viz., AST, ALP, LDH and γ-GT, enzymatic antioxidants viz., SOD, CAT, GSH and GPx and histopathological changes have been estimated. The tissue damaging enzymes were found to be high in DEN alone treated group whereas the enzymatic antioxidants decreased destructively. Severe lesions and cirrhosis were observed in the toxin (DEN alone) treated group. The luteolin treated DEN group altered the tissue damaging enzymes and the enzymatic antioxidants. The damaged lesion in the histoarchitecture of DEN treated rat liver was almost completely restored. Finally this study strongly demonstrates that luteolin has potent curative property against HCC in albino rats. 相似文献
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《中国科学院院刊(英文版)》2008,22(2):88-88
Although olives were used for medical purposes as early as more than 150 years ago, modern studies of various olive extracts have revealed them to be powerful antioxidants that can treat a range of health problems. 相似文献
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P. Faizal B. Satheeshan Milindkumar A.K. Adarsh R. Shilpa P. Roshni T. Remya K.T. Augusti 《Indian journal of clinical biochemistry : IJCB》2013,28(4):426-428
Extensive research has demonstrated the protective properties of antioxidants, which scavenge reactive oxygen species and their precursors, as well as up-regulate enzymes involved in the repair of cellular damage. Several case–control studies have showed higher blood levels of antioxidants and decreased oxidative stress in younger individuals when compared with older ones. Cell damage caused by free radicals appears to be a major contributor in aging and degenerative diseases of aging such as cancer, cardiovascular disease, cataracts, compromised immune system, rheumatoid arthritis and brain dysfunction. The objective of this study was to determine the variation of Circulating levels of selected antioxidants (enzymic and non enzymic) and oxidative stress marker in younger and older humans. The results showed that a majority of the younger age group participants showed a significant increase in enzymic and nonenzymic antioxidant status and a decrease in oxidative stress when compared with the older age group. 相似文献
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D. Vijayakumar K. Suresh S. Manoharan Ph.D. 《Indian journal of clinical biochemistry : IJCB》2006,21(1):105-105
The main objective of the study was to assess the oxidative stress in plasma and erythrocytes of rheumatoid arthritis patients
by measuring the levels of thiobarbituric acid reactive substances (TBARS), non-enzymatic antioxidants (vitamin E, C and reduced
glutathione) and enzymatic antioxidants [superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GSHPx)]. This
study has been conducted on twenty-two adult female rheumatoid arthritis patients and an equal number of healthy subjects.
Elevated lipid peroxidation and multidirectional changes in the antioxidant defence system were noticed in patients with rheumatoid
arthritis. The enhanced lipid peroxidation accompanied by disturbance in antioxidant status indicates that rheumatoid arthritis
patients are more prone to free radical mediated oxidative damage. 相似文献
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Sadanand B. Patil M. V. Kodliwadmath Sheela M. Kodliwadmath 《Indian journal of clinical biochemistry : IJCB》2008,23(1):45-48
The present study was designed to evaluate the lipid peroxidation and non-enzymatic antioxidants in pregnancyinduced hypertension
(PIH) compared with healthy normal pregnant and non-pregnant as controls. 75 cases were studied of which 25 were normal healthy
controls (Group A), 25 healthy pregnant women (Group B) of third trimester and 25 were PIH (Group C) of the same trimester.
In PIH, malondialdehyde a lipid peroxidation product was significantly increased as compared to normal pregnant and non-pregnant
controls. The nonenzymatic antioxidants like reduced glutathione, Vitamin-E, Vitamin-C and Vitamin-A were significantly decreased
in normal pregnants as compared to controls. A further significant decrease was noticed in PIH compared to normal pregnants.
A significant negative correlation was detected between lipid peroxidation and non-enzymatic antioxidant levels. Our study
clearly indicates a relationship between elevated lipid peroxidation, decreased non-enzymatic antioxidant in PIH. The measurement
of non-enzymatic antioxidants in plasma may be useful predictor of the likely development of PIH. 相似文献
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V. K. Verma V. Ramesh Satyendra Tewari R. K. Gupta Nakul Sinha C. M. Pandey 《Indian journal of clinical biochemistry : IJCB》2005,20(2):68-74
A study has been carried out on 250 CAD patients to see how the serum levels of three antioxidants i.e., Vitamin C, Bilirubin
and Ceruloplasmin are related to the CAD risk factors and characteristics in these patients. The number of severe category
CAD patients declined by 7–18% with increasing serum levels of the three antioxidants and, triple vessel disease declined
by 14–20%. A decline of 39% in Myocardial Infarction (MI) occurred with increasing serum Ceruloplasmin. Serum Ceruloplasmin
was significantly lower in the MI group compared to the non MI group CAD patients. There was a steady and a significant decline
in the mean values of serum levels of cholesterol, Triglyceride, VLDL cholesterol along with BMI with increasing serum level.
The study indicates that with increasing serum levels of the three antioxidants studied, the % MI along with % Triple vessel
disease and severity of CAD goes down suggesting that the modifiable risk factors have to be suitably modified in order to
maintain a reasonably high level of these antioxidants, as the risk factors are inversely related to the serum antioxidant
levels. 相似文献