终末期肾病氧化应激状态的研究

为了解氧化应激状态及肾替代治疗对终末期肾病(ESRD)患者的影响 ,笔者比较了正常人、慢性肾功能不全 (CRF)、腹膜透析(CAPD)和血液透析 (HD)病人之间血浆还原型谷胱甘肽 (GSH)、维生素E、丙二醛 (MDA)和蛋白羰基含量及全血谷胱甘肽过氧化物酶(GPx)活性的差异。结果显示与正常人相比 ,CRF病人循环GSH浓度和GPx活性降低 (P均 <0 0 5 ) ,CAPD和HD病人循环GSH、维生素E浓度和GPx活性均明显降低 (P均 <0 0 5 ) ,而血浆MDA和蛋白羰基含量均显著升高 (P均 <0 0 5 ) ;HD患者血浆GSH和维生素E含量比CRF组降低(P均 <0 0 5 )。提示ESRD患者处于氧化应激状态 ,血液透析进一步加剧这种病理生理改变     

Combined antioxidant treatment effects on blood oxidative stress after eccentric exercise

PURPOSE: This study was designed to ascertain the effects of a combination antioxidant therapy on plasma protein carbonyls (PC), malondialdehyde (MDA), and whole blood total (TGSH), oxidized (GSSG), and reduced (GSH) glutathione in non-resistance trained females after eccentric resistance exercise. METHODS: Eighteen women (aged 19-31 yr) were randomized in a double-blind manner to either an antioxidant supplement (N = 9; 400 IU vitamin E, 1 g vitamin C, and 90 mug selenium per day) or a lactose placebo (N = 9) for 14 d before and for 2 d after eccentric elbow flexor exercise. Blood samples taken before and immediately, 2, 6, 24, and 48 h postexercise were analyzed for PC, MDA, TGSH, and GSSG. RESULTS: No treatment by time interaction was noted for any variable, with all blood markers experiencing a change after the exercise in both conditions. Time main effects were observed for PC, MDA, and GSSG, with values elevated above preexercise after the eccentric exercise, whereas GSH concentration decreased after the eccentric exercise. Antioxidant supplementation resulted in a condition main effect for PC and MDA, with lower values compared with placebo. The antioxidant treatment attenuated the rise in both PC (75%) and MDA (100%). CONCLUSION: These data suggest that eccentric resistance exercise can increase blood biomarkers of oxidative stress in non-resistance trained females, and this vitamin E, C, and selenium supplementation can attenuate the rise in PC and MDA.     

维生素E对血液透析病人氧化应激的干预效果

目的　研究抗氧化剂维生素E对血液透析病人氧化应激状态的干预效果。方法　处于稳定状态的血液透析病人 5 6例 (不服用任何抗氧化药)采用自身对照的方法 ,观察 1个月后 ,随机均分为两个实验组 ,A组口服维生素E 2 0 0mg/d ,B组口服维生素E 4 0 0mg/d,服药 1个月 ;两组分别在观察期和服用维生素E干预期前后检测循环晚期氧化蛋白产物(AOPP)、丙二醛 (MDA)和谷胱甘肽过氧化物酶(GSHPx)水平以及血清维生素E浓度。另选 5 6例健康者作为正常对照组。结果　实验组血清AOPP、MDA水平明显高于同龄正常对照组(n =5 6 ,P <0 0 1) ,GSHPx、维生素E浓度明显低于正常人(P <0 0 1) ;透析病人在未服抗氧化药的 1个月观察期前后AOPP、MDA、GSHPx及维生素E浓度无明显变化 (P均 >0 0 5 ) ;A组治疗后 ,血清维生素E水平较治疗前明显增高 (P <0 0 1) ,但AOPP、MDA和GSHPx水平与治疗前相比无明显差异 ;B组治疗后血清维生素E、GSHPx水平较治疗前增高 (P <0 0 1,P <0 0 5 ) ,AOPP较治疗前明显降低 (P <0 0 1) ,但MDA水平无明显变化。结论　口服大剂量维生素E(4 0 0mg/d)可以改善血透病人的氧化应激状态 ;血透病人短期服用大剂量维生素E未见明显副作用。     

Possible role of vitamin E,coenzyme Q10 and rutin in protection against cerebral ischemia/reperfusion injury in irradiated rats

Purpose:?To investigate the possible role of vitamin E, coenzyme Q10 and rutin in ameliorating the biochemical changes in brain and serum induced by cerebral ischemia/reperfusion (I/R) in whole body γ-irradiated rats.

Materials and methods:?Cerebral ischemia was induced in male Wistar rats (either irradiated or non-irradiated) followed by reperfusion.

Results:?I/R increased brain content of malondialdehyde (MDA) and depleted its glutathione (GSH) content with a compensatory elevation in cytosolic activities of glutathione peroxidase (GPx) and glutathione reductase (GR) enzymes. It also raised brain cytosolic lactate dehydrogenase (LDH) activity and calcium (Ca²⁺) level. Furthermore, I/R provoked an inflammatory response reflected by an increment in serum levels of the proinflammatory cytokines tumour necrosis factor-α (TNF-α) and interlukin-1β (IL-1β). Moreover, induction of I/R in irradiated rats resulted in a further increase in brain oxidative stress and cytosolic LDH activity, disturbed brain Ca²⁺ homeostasis and exaggerated the inflammatory reaction. During irradiation, administration of each of vitamin E, coenzyme Q10 (CoQ10) and rutin to irradiated rats before induction of I/R, alleviated the brain oxidative stress. Moreover, these antioxidants caused attenuation of the rise of the cytosolic activities of GPx and GR. A lowering effect of the cytosolic LDH activity and Ca²⁺ level were caused by treatment with antioxidants. Each of vitamin E and rutin revealed an anti-inflammatory action of these antioxidants, while CoQ10 had no effect on serum levels of TNF-α and IL-1β.

Conclusion:?These findings indicate that supplementation with either vitamin E, CoQ10 or rutin ameliorated most of the biochemical changes induced by I/R in irradiated rat brain and serum.     

Effects of vitamin E supplementation on oxidative stress at rest and after exercise to exhaustion in athletic students

AIM: The purpose of this study is to determine the effect following exercise to exhaustion of vitamin E supplementation on oxidative stress in athletic students. METHODS: Twenty male students voluntarily participated in the study and were randomly assigned (double blind) to either a vitamin E (daily dose of 450 mg of a-tocopherol for a period of 8 weeks) or a placebo group (took capsules containing 450 mg of lactose for 8 weeks). Before and after 8 weeks blood samples were collected at rest and after exercise to exhaustion. Oxidative stress markers were malondialdehyde (MDA), carbonylated proteins (CP) and creatine kinase (CK). Also, the effect of vitamin E on ergometer cycling time, as an example of endurance performance, was evaluated. RESULTS: ANOVA and independent t-tests indicated that vitamin E supplementation did not significantly change (P > 0.05) MDA, CP and CK values at rest, after exercise to exhaustion, and cycling time, but plasma volume after exercise to exhaustion significantly decreased (P < 0.05). CONCLUSIONS: Although vitamin E supplementation had no effect on exercise performance or capacity in athletic students, further investigation is required using larger numbers of subjects and measures of vitamin E before unequivocal conclusion can be stated.     

Impact of intensive insulin treatment on the development and consequences of oxidative stress in insulin-dependent diabetes mellitus

BACKGROUND/AIM: The aim of this study, which included patients with insulin-dependent diabetes mellitus, was to determine the influence of the application of various treatment modalities (intensive or conventional) on the total plasma antioxidative capacity and lipid peroxidation intensity expressed as malondialdehyde (MDA) level, catalase and xanthine oxidase activity, erythrocyte glutatione reduced concentration (GSH RBC), erythrocyte MDA level (MDA RBC), as well as susceptibility of erythrocyte to H2O2-induced oxidative stress. METHODS: This study included 42 patients with insulin-dependent diabetes mellitus. In 24 of the patients intensive insulin treatment was applied using the model of short-acting insulin in each meal and medium-acting insulin before going to bed, while in 18 of the patients conventional insulin treatment was applied in two (morning and evening) doses. In the examined patients no presence of diabetes mellitus complications was recorded. The control group included 20 healthy adults out of a blood doner group. The plasma and erythrocytes taken from the blood samples were analyzed immediately. RESULTS: This investigation proved that the application of intensive insulin treatment regime significantly improves total antioxidative plasma capacity as compared to the application of conventional therapy regime. The obtained results showed that the both plasma and lipoproteines apo B MDA increased significantly more in the patients on conventional therapy than in the patients on intensive insulin therapy, most probably due to intensified xanthine oxidase activity. The level of the MDA in fresh erythrocytes did not differ significantly between the groups on intensive and conventional therapy. The level of GSH and catalase activity, however, were significantly reduced in the patients on conventional therapy due to the increased susceptibility to H2O2-induced oxidative stress CONCLUSION: The presented study confirmed positive effect of intensive insulin therapy on metabolic control expressed through glycemia level glycolysed hemoglobine (HbAlc) and fructosamine, as well as through antioxidative/prooxidative homeostasis. This is the confirmation that an adequate treatment choice can prevent numerous diabetes mellitus complications induced by free radicals.     

Oxidative stress in hemodialyzed patients during exhausting exercise.

BACKGROUND: This study was designed to study the effect of an exhausting exercise test on plasma lipid peroxidation marker (malondialdehyde, MDA) and on vitamin E levels in hemodialyzed patients (HD) compared to healthy control subjects (HC). METHODS: Eight sedentary chronically HD, (39.0+/-10.8 years) and eight sedentary HC (38.4+/-12.4 years) were studied. Before exercise, the activity of scavenger enzymes [plasma and erythrocyte glutathione peroxidase (GPX), and erythrocyte superoxide dismutase (SOD)] was determined. All subjects performed a symptom-limited exercise test; respiratory gas exchanges were collected on-line and blood was sampled five min before exercise, at exhaustion and after 30 min of recovery. RESULTS: At rest, the activity of plasma and erythrocyte GPX and erythrocyte SOD was significantly lower in HD than in HC. Exercise provoked an increase of plasma MDA concentration after recovery in HD patients, whereas our HC group show a decrease in MDA plasma level immediately after exercise, returning to the rest values during recovery. Exercise induced no change of vitamin E concentration in HD whereas in HC it increased during recovery. CONCLUSIONS: Our results indicate that: 1) at rest: although hemodialyzed patients showed lower scavenger enzymes activity than HC subjects, there was no difference in MDA plasma level between groups; 2) there is some evidence that physical exercise contribute to oxidative stress during recovery in HD patients, and 3) exercise induced an increase in plasma vitamin E concentration in healthy subjects.     

Oxidative stress response to aerobic exercise: comparison of antioxidant supplements

PURPOSE: To compare the effects of two antioxidant formulas on biomarkers of oxidative stress before and after aerobic exercise. METHODS: Aerobically trained men (N=25) and women (N=23) were assigned to one of three treatments: 400 IU of vitamin E+1 g of vitamin C (V; N=15), a fruit and vegetable juice powder concentrate (FV; N=16), or a placebo (P; N=17). Subjects ran for 30 min at 80% VO(2 max) before, after 2 wk of supplementation, and after a 1-wk washout period. Blood samples were taken before and immediately after exercise and analyzed for protein carbonyls (PC), malondialdehyde (MDA), 8-hydroxydeoxyguanosine (8-OHdG), and vitamins C and E. RESULTS: The V treatment increased plasma vitamin C and E after 2 wk (P 相似文献   

A moderate protective effect of quercetin against γ-irradiation- and storage-induced oxidative damage in red blood cells for transfusion

Abstract

Purpose: To investigate the extent of γ-irradiation-induced oxidative membrane damage and antioxidant activity of quercetin in long-term, cold stored (4°C) acid-citrate-dextrose- preserved human red blood cells (RBC).

Materials and methods: The extracellular activity of lactate dehydrogenase (LDH) was measured to assess RBC membrane integrity. Lipid peroxidation and reduced glutathione (GSH) levels were quantified by thiobarbituric acid-reactive substances (TBARS) and Ellman's reagent, respectively.

Results: During storage of non-irradiated RBC (up 21 days) the LDH activity in the supernatant increased with time. In contrast to a low dose of ionizing radiation (30 Gy), irradiation at higher, but still clinically relevant doses, of 40–50 Gy resulted in elevation of the post-storage extracellular LDH activity. Quercetin (2–50 μM) dissolved in dimethyl sulfoxide (DMSO) significantly increased the LDH release in the irradiated and non-irradiated RBC, reflecting an increase of RBC membrane permeability. In the presence of ethanol as a solvent quercetin protected RBC against storage-induced oxidative damage – it inhibited the LDH release, GSH depletion, and lipid peroxidation.

Conclusion: The level of protection offered by quercetin against the radiation- and storage-induced oxidative damage to RBC does not seem to be sufficient to warrant its application as an additive for conservation purposes. The findings indicate that the solvent can modulate a response of RBC to water-insoluble antioxidants changing their properties from anti-oxidative to pro-oxidative.     

中度高原地区正常及妊高征孕妇超氧化物歧化酶和丙二醛水平的初步研究

本文测定了未孕妇女、正常孕妇和妊高征孕妇的超氧化物歧化酶（ＳＯＤ），丙二醛（ＭＤＡ）和维生素Ｅ（ＶＥ）水平。结果为正常孕妇ＳＯＤ低于未孕妇女，而ＭＤＡ和ＶＥ高子未孕妇女（Ｐ均＜０．０１），提示孕妇抗氧化能力可能增强。妊高征孕妇与正常孕妇相比，ＳＯＤ、ＶＥ更低（Ｐ＜０．０１），而ＭＤＡ则更高（Ｐ＜０．０５），而且妊高征孕妇的ＭＤＡ与ＳＯＤ、ＭＤＡ与ＶＥ呈负相关（ｒ＝－０．９５６，－０．７０４８、Ｐ＜０．０５），提示可能有脂质过氧化反应的增强和氧化能力下降，为妊高征的急性动脉硬化提供了条件。     

Exercise does not induce oxidative stress in trained heart transplant recipients

PURPOSE: The objectives of this study were twofold: 1) to determine the effect of incremental exercise to volitional fatigue on plasma levels of lipid peroxidation (malondialdehyde) in heart transplant recipients (HRT) and 2) to examine blood antioxidant capacity in HTR by assessment of antioxidant enzyme activities and vitamin E levels. METHODS: Seven endurance-trained HTR (mean +/- SD; age 39.7 +/- 12.8 yr) and seven endurance-trained healthy, age-matched control subjects (HC) (mean age 40.6 +/- 10.7 yr) performed a symptom-limited incremental exercise test on a cycle ergometer. Venous blood samples were obtained at rest, exercise, and during recovery and analyzed for plasma levels of malondialdehyde (MDA) as well as markers of blood antioxidant capacity. After exercise and during recovery, all dependent measures were corrected for plasma volume changes induced by exercise. Significance was established at (P < 0.05). RESULTS: No group differences existed in plasma levels of MDA at rest. Further, graded exercise did not alter plasma levels of MDA in either group. Resting erythrocyte glutathione peroxidase (GPX) activity was significantly lower and erythrocyte superoxide dismutase (SOD) activity was higher in HTR compared with HC. Finally, at rest, no group differences existed in plasma GPX activity or vitamin E levels. CONCLUSIONS: Graded exercise to fatigue does not promote an increase in oxidative stress in blood of exercise trained HTR. Therefore, physical exercise does not appear to pose an oxidative-stress risk for these patients.     

低氧复合氰化钠中毒对大鼠肺的损伤效应

目的探讨低氧复合氰化钠(NaCN)中毒对大鼠的肺损伤效应。方法以低压氧舱模拟4 000m低氧环境。72只大鼠随机分为海拔308m中毒组和海拔4 000m中毒组。皮下注射3.6mg/kg NaCN,分别于0、0.5、1、2、4、6h取肺组织和支气管肺泡灌洗液(BALF),测定超氧化物歧化酶(SOD)、谷胱甘肽-过氧化物酶(GSH-PX)活力,丙二醛(MDA)、谷胱甘肽(GSH)、伊文思蓝(EB)含量,酸性磷酸酶(ACP)、乳酸脱氢酶(LDH)及碱性磷酸酶(AKP)的活性。结果NaCN中毒后BALF中LDH、ACP及AKP活性明显增高,0.5h最高。低氧(海拔4 000m)复合NaCN中毒大鼠BALF中LDH、ACP及AKP活性明显高于同一时相点单纯(海拔308m)NaCN中毒大鼠。低氧复合NaCN中毒能引起肺组织和BALF中的GSH含量、SOD和GSH-PX活力下降,并引起MDA含量增加,各指标的变化幅度远大于单纯NaCN中毒的效应。结论在低氧条件下NaCN的细胞毒性作用增强,肺损伤程度加重,严重影响大鼠肺的氧化应激水平和肺血管通透性。     

Eryptosis and hemorheological responses to maximal exercise in athletes: Comparison between running and cycling

We compared the effects of cycling and running exercise on hemorheological and hematological properties, as well as eryptosis markers. Seven endurance‐trained subjects randomly performed a progressive and maximal exercise test on a cycle ergometer and a treadmill. Blood was sampled at rest and at the end of the exercise to analyze hematological and blood rheological parameters including hematocrit (Hct), red blood cell (RBC ) deformability, aggregation, and blood viscosity. Hemoglobin saturation (SpO2), blood lactate, and glucose levels were also monitored. Red blood cell oxidative stress, calcium content, and phosphatidylserine exposure were determined by flow cytometry to assess eryptosis level. Cycling exercise increased blood viscosity and RBC aggregation whereas it had no significant effect on RBC deformability. In contrast, blood viscosity remained unchanged and RBC deformability increased with running. The increase in Hct, lactate, and glucose concentrations and the loss of weight at the end of exercise were not different between running and cycling. Eryptosis markers were not affected by exercise. A significant drop in SpO2 was noted during running but not during cycling. Our study showed that a progressive and maximal exercise test conducted on a cycle ergometer increased blood viscosity while the same test conducted on a treadmill did not change this parameter because of different RBC rheological behavior between the 2 tests. We also demonstrated that a short maximal exercise does not alter RBC physiology in trained athletes. We suspect that exercise‐induced hypoxemia occurring during running could be at the origin of the RBC rheological behavior differences with cycling.     

氧合液对高原失血性休克家兔脂质过氧化损伤的保护作用

目的：探讨氧合液的抗休克作用和机制。方法：在４７００ｍ的高海拔区实地观察了氧合液对高原失血性休克家兔脂质过氧化损伤的保护作用。结果：氧合液治疗后能明显降低休克动物血浆和组织中ＭＤＡ水平,提高血浆和组织中ＳＯＤ、ＧＳＨ－ＰＸ水平,降低血浆和组织中ＧＳＨ水平。结论：休克后及时使用氧合液治疗能早期纠正体内脂质过氧化损伤,恢复休克机体内氧化与抗氧化新的平衡,从而休克机体复苏。     

二氧化氮致大鼠急性肺损伤及其机理探讨

目的：探讨ＮＯ２致急性肺损伤机理。方法：大鼠静式吸入染毒,观测肺组织病理变化及肺泡灌洗液中蛋白和ＬＤＨ含量,同时测定肺组织抗氧化物及丙二醛的含量。结果：大鼠吸入ＮＯ２后,肺组织明显损伤,同时ＧＳＨ－Ｐｘ,ＳＯＤ,维生素Ｅ,总巯基含量显著降低,ＭＤＡ含量也明显下降,肺损伤越重,各指标下降越明显,随着肺损伤的修复,各指标也恢复正常。     

小鼠高原低氧环境暴露下脑内脂质过氧化损伤与高原脑水肿的关系

目的：观察高原不同海拔梯度下脑内脂质过氧化物的代谢变化,进一步探讨高原脑水肿的发生机理。方法：取三个不同海拔梯度下脑组织匀浆化学法测定脑内超氧化物歧化酶,丙二醛,谷胱甘肽过氧化物酶和谷胱甘肽。结果：小鼠急进高海拔区后,随着海拔升高,ＳＯＤ含量逐渐升高,ＭＤＡ始终不变,但ＧＳＨ－ＰＸ和ＧＳＨ在进入中海拔区后增高,进入高海拔后ＧＳＨ－ＰＸ明显降低,而ＧＳＨ明显增高,差异均非常显著。     

小鼠高原低氧环境暴露下脑内脂质过氧化损伤与高原脑水肿的关系

目的 观察不同海拔梯度下脑内脂质过氧化物的变化,探讨高原脑水肿的发生机理。方法 取三个不同海拔样度下小鼠脑组织匀浆化学法测定脑内ＳＯＤ、ＭＤＡ、ＧＳＨ－ＰＸ 和ＧＳＨ的含量。结果 小鼠急性进高海拔区后,随着海拔升高,脑内ＳＯＤ和ＧＳＨ含量逐渐升高,ＭＤＡ始终不变,但ＧＳＨ－ＰＸ进入中海拔区后增高,进入高海拔区后明显降低,差异均非常显著。在高海拔区随着时间延长ＳＯＤ和ＧＳＨ呈增高趋势,ＧＸＨ－ＰＸ呈     

The prophylactic effect of vitamin C on oxidative stress indexes in rat eyes following exposure to radiofrequency wave generated by a BTS antenna model

Abstract

Purpose: This study was conducted to evaluate the effect of radiofrequency wave (RFW)-induced oxidative stress in the eye and the prophylactic effect of vitamin C on this organ by measuring the antioxidant enzymes activity including: glutathione peroxidase (GPx), superoxide dismutase (SOD) and catalase (CAT), and malondialdehyde (MDA).

Materials and methods: Thirty-two adult male Sprague-Dawley rats were randomly divided into four experimental groups and treated daily for 45 days as follows: Control, vitamin C (L-ascorbic acid 200 mg/kg of body weight/day by gavage), test (exposed to 900 MHz RFW) and the treated group (received vitamin C in addition to exposure to RFW). At the end of the experiment all animals were sacrificed, their eyes were removed and were used for measurement of antioxidant enzymes and MDA activity.

Results: The results indicate that exposure to RFW in the test group decreased antioxidant enzymes activity and increased MDA compared with the control groups (P < 0.05). In the treated group vitamin C improved antioxidant enzymes activity and reduced MDA compared to the test group (P < 0.05).

Conclusions: It can be concluded that RFW causes oxidative stress in the eyes and vitamin C improves the antioxidant enzymes activity and decreases MDA.     

Increased oxidative stress following acute and chronic high altitude exposure

The generation of reactive oxygen species is typically associated with hyperoxia and ischemia reperfusion. Recent evidence has suggested that increased oxidative stress may occur with hypoxia. We hypothesized that oxidative stress would be increased in subjects exposed to high altitude hypoxia. We studied 28 control subjects living in Lima, Peru (sea level), at baseline and following 48 h exposure to high altitude (4300 m). To assess the effects of chronic altitude exposure, we studied 25 adult males resident in Cerro de Pasco, Peru (altitude 4300 m). We also studied 27 subjects living in Cerro de Pasco who develop excessive erythrocytosis (hematocrit > 65%) and chronic mountain sickness. Acute high altitude exposure led to increased urinary F(2)-isoprostane, 8-iso PGF(2 alpha) (1.31 +/- 0.8 microg/g creatinine versus 2.15 +/- 1.1, p = 0.001) and plasma total glutathione (1.29 +/- 0.10 micromol versus 1.37 +/- 0.09, p = 0.002), with a trend to increased plasma thiobarbituric acid reactive substance (TBARS) (59.7 +/- 36 pmol/mg protein versus 63.8 +/- 27, p = NS). High altitude residents had significantly elevated levels of urinary 8-iso PGF(2 alpha) (1.3 +/- 0.8 microg/g creatinine versus 4.1 +/- 3.4, p = 0.007), plasma TBARS (59.7 +/- 36 pmol/mg protein versus 85 +/- 28, p = 0.008), and plasma total glutathione (1.29 +/- 0.10 micromol versus 1.55 +/- 0.19, p < 0.0001) compared to sea level. High altitude residents with excessive erythrocytosis had higher levels of oxidative stress compared to high altitude residents with normal hematological adaptation. In conclusion, oxidative stress is increased following both acute exposure to high altitude without exercise and with chronic residence at high altitude.     

膳食补铁对心理应激大鼠肝脏氧化应激状态的影响

目的研究喂饲不同铁含量的饲料对心理应激大鼠肝脏氧化应激状态的影响,为心理应激情况下是否应膳食补铁提供实验依据。方法将48只大鼠随机分为空白对照组与心理应激组,再将两组各随机分成3个亚组：低铁组、中铁组及高铁组。心理应激组以电击为应激源建立心理应激模型。实验开始的同时3个亚组分别用不同铁含量的人工合成饲料喂养。实验结束后测定肝脏铁含量、丙二醛（MDA）含量以及抗氧化酶活性。结果随着膳食铁含量的增加,大鼠肝脏铁含量、MDA含量升高,还原型谷胱甘肽（GSH）含量以及超氧化物歧化酶（SOD）活性降低,这种变化在心理应激组更加显著。结论膳食补充铁可加重肝脏的铁蓄积和氧化应激,为了维护经常处于心理应激人群的健康,应对该人群的适宜铁摄入量进行深入研究。