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1.
Pesticides such as organophosphorus and organochlorine compounds commonly used in agriculture for achieving better quality products are toxic substances and lead to generation of reactive oxygen species (ROS) which have harmful effects on human health. While pyrethroid pesticides are used in preference to organophosphates and organochlorines due to their high effectiveness, low toxicity to non-target organisms and easy biodegradability, they may also produce oxidative stress. Thus, we investigated the effects of chlorpyrifos (CP, an organophosphate) and deltamethrin (DM, a pyrethroid pesticide) treatments at low and high doses on lipid peroxidation (LPO) and antioxidant enzyme activities such as SOD, GSH-Px and CAT in rat liver following 16 weeks exposure. Antioxidative defence mechanisms and lipid peroxidation in rat liver tissues display different responses depending on different pesticide treatments and doses. Biochemical analysis showed that administrations of the chlorpyrifos and deltamethrin cause liver damage. In the present study, we observed that lipid peroxidation levels are higher at high doses than at low doses, but DM caused more pronounced increase than CP. Experimentally, we have also observed that oxidant-antioxidant balance is more affected by deltamethrin treatment than by chlorpyrifos. 相似文献
2.
Lilian E. Thielemann Cleofina Bosco Ramn Rodrigo Myriam Orellana Luis A. Videla 《Journal of biochemical and molecular toxicology》1999,13(1):47-52
Administration of bromoethylamine (BEA, 1.2 mmol/kg) to fed rats induced a significant diminution in the activity of hepatic superoxide dismutase (at 1 h after treatment), catalase, and glutathione peroxidase and in the content of nonprotein sulfhydryls (at 15 h after treatment). The content of thiobarbituric acid reactants by the liver was enhanced by 1.9 times over control values (at 3 h). Light microscopy studies revealed that BEA (72 h after treatment) induced periportal fatty accumulation, focal liver cell necrosis, and diffuse inflammatory infiltrates, in addition to hypertrophic Kupffer cells and mitotic hepatocytes. Also, hypertrophic middle tunic or hypertrophic smooth muscle layers of arterioles was observed in the periportal space, with dilated sinusoidal capillaries and free macrophage infiltration. It is concluded that BEA induces a derangement in the antioxidant status of the liver with the consequent lipid peroxidation response, which may constitute a significant hepatotoxic mechanism of the haloaklylamine. © 1998 John Wiley & Sons, Inc. J Biochem Mol Toxicol 13: 47–52, 1999 相似文献
3.
The aim of this work was to determine the effects of dietary intake vitamin E and selenium (Se) on lipid peroxidation as thiobarbituric
acid reactive substances (TBARS) and on the antioxidative defense mechanisms in the liver of rats treated with high doses
of prednisolone. Two hundred fifty adult male Wistar rats were randomly divided into five groups. The rats were fed a normal
diet, but groups 3, 4, and 5 received a daily supplement in their drinking water of 20 mg vitamin E, 0.3 mg Se, and a combination
of vitamin E and Se, respectively, for 30 d. For 3 d subsequently, the control group (group 1) was treated with a placebo,
and the remaining four groups were injected intramuscularly with 100 mg/kg body weight (BW) prednisolone. After the last administration
of prednisolone, 10 rats from each group were killed at 4, 8, 12, 24, and 48 h and the activities of glutathione peroxidase
(GSH-Px), superoxide dismutase (SOD), and catalase (CAT) enzymes and the levels of glutathione (GSH) and TBARS in their livers
were measured. GSH-Px, SOD, and CAT enzyme activities and GSH levels in prednisolone-treatment group (group 2) began to decrease
gradually at 4 h, falling respectively to 38%, 55%, and 40% of the control levels by 24 h, and recovering to the control levels
at 48 h. In contrast, prednisolone administration caused an increase in the hepatic TBARS, reaching up to four times the levels
of the control at 24 h. However, supplementation with vitamin E and Se had a preventive effect on the elevation of the hepatic
TBARS and improved the diminished activities of the antioxidative enzymes and the levels of GSH. Therefore, the present study
demonstrates the effectiveness of vitamin E and Se in reducing hepatic damage in glucocorticoid-treated rats and suggests
that reductions in increased TBARS as a result of prednisolone may be an important factor in the action of vitamin E and Se. 相似文献
4.
铁镉互作对水稻脂质过氧化及抗氧化酶活性的影响 总被引:2,自引:0,他引:2
利用营养液培养方法,以‘沈农265’为供试品种,研究不同Fe(0、0.1、0.25、0.5mmolFe2+·L-1)、Cd(0、0.1、1.0μmolCd2+·L-1)处理对水稻植株体内脂质过氧化及抗氧化酶活性的影响.结果表明:单独供应Fe显著降低了水稻地上部和根系生物量,同时供应Cd后生物量不再下降;单独供应Cd降低了根系中丙二醛(MDA)和可溶性蛋白含量,而同时供应Fe时这种降低作用消失.Fe处理降低了水稻地上部和根系Cd含量,Cd处理也降低了Fe含量,两者表现出明显的相互抑制作用.高Cd(1.0μmol·L-1)和Fe互作,增加了水稻根系中MDA和可溶性蛋白含量,降低了超氧化物岐化酶(SOD)和过氧化氢酶(CAT)活性.表明在低Cd环境中为水稻提供一定数量的外源Fe能降低植株Cd含量;但高Cd胁迫将降低水稻对Fe的吸收,并导致植株体内产生脂质过氧化. 相似文献
5.
嫁接对低温弱光下辣椒幼苗膜脂过氧化及抗氧化酶活性的影响 总被引:8,自引:1,他引:8
以‘卫士’为砧木,以‘赤峰特选’为接穂进行嫁接,在光照培养箱内对辣椒自根苗(对照)和嫁接苗进行低温 (8 ℃/5 ℃) 弱光(100 μmol·m-2·s-1)处理,处理7 d后在正常条件(25 ℃/18 ℃,550~600 μmol·m-2·s-1)下恢复3 d,研究低温弱光下辣椒嫁接苗和自根苗电解质渗漏率(EL)、丙二醛(MDA)含量、抗氧化酶活性及根系活力的变化.结果表明:低温弱光胁迫初期,辣椒幼苗叶片与根系的EL、MDA含量和超氧化物歧化酶(SOD)、过氧化物酶(POD)、抗坏血酸过氧化物酶(APX)、谷胱甘肽还原酶(GR)活性均显著升高,而根系活力大幅降低;1~3 d后EL和MDA含量趋于平稳,SOD、POD、APX、GR活性逐渐降低,根系活力呈上升趋势.恢复3 d后,嫁接苗EL、MDA含量、抗氧化酶活性及根系活力多达到或超过胁迫前水平(根系的MDA含量较胁迫前略高);而自根苗的EL和MDA含量仍显著高于胁迫前.与自根苗相比,嫁接苗在各处理阶段的EL和MDA含量显著降低,而SOD、POD、APX、GR活性及根系活力明显升高,说明嫁接可有效降低辣椒植株的膜脂过氧化,减轻低温弱光对其细胞膜的伤害. 相似文献
6.
In vivo effect of diosmin on carrageenan and CCl4-induced lipid peroxidation in rat liver microsomes
Anne M. Melin Annie Perromat Michel Clerc 《Journal of biochemical and molecular toxicology》1996,11(1):27-32
The aim of this study was to compare the protective effect of a flavonoid, the 3′5,7-trihydroxy-4′-methoxyflavone 7-rutinoside or diosmin, on liver microsomal lipid peroxidation induced in rats by either carbon tetrachloride or carrageenan. Thirty rats were divided into five groups. Group 1 received no chemical product and was considered as control. Groups 2 and 3 received either an intraperitoneal injection of carrageenan or carbon tetrachloride 48 or 24 hours before killing, respectively. Groups 4 and 5 were treated first with an intraperitoneal injection of diosmin and then by carrageenan (group 4) or carbon tetrachloride (group 5) 48 or 24 hours before killing, respectively. The lipoperoxidant effect of carrageenan and carbon tetrachloride was demonstrated by both significant decreases in polyunsaturated fatty acids, principally 20:4 (n− 6) (p < 0.05) and of vitamin A (p < 0.05) in groups 2 and 3. With diosmin treatment, only thiobarbituric acid reactive substances significantly decreased in group 4, whereas vitamin A level increased. These results could suggest that the effect of diosmin differs with the choice of chemical product used; it seems a better antioxidant against products inducing inflammation. © 1996 John Wiley & Sons, Inc. 相似文献
7.
Age-dependent changes in rat liver lipid peroxidation and glutathione content induced by acute ethanol ingestion 总被引:1,自引:0,他引:1
The study of the influence of the age of animals (13 to 53 weeks) on total liver thiobarbituric acid reactive substances (TBAR) content showed an increase which is maximal in rats of 39 weeks of age compared to young animals (13 weeks), followed by a dimunition in the 53 weeks old group. In this situation, the content of hepatic GSH and total GSH equivalents as well as the GSH/GSSG ratio were decreased with ageing, while GSSG levels were enhanced in the oldest group studied. Acute ethanol intoxication resulted in a marked increase in liver TBAR content in young animals, together with a decline in GSH, total GSH equivalents and GSH/GSSG ratio, and an enhancement in GSSG. These changes elicited by ethanol intake were reduced with ageing. It is concluded that ethanol-induced oxidative stress in the liver is diminished during ageing, despite the progressive decrease in the glutathione content of the tissue observed in control animals. 相似文献
8.
Wolfgang Augustin Ingrid Wiswedel Heiko Noack Thomas Reinheckel Olaf Reichelt 《Molecular and cellular biochemistry》1997,174(1-2):199-205
Mitochondria are cellular organelles where the generation of reactive oxygen species may be high. They are, however, effectively protected by their high capacities of antioxidative systems, as enzymes and either water or lipid soluble low molecular weight antioxidants.These antioxidative defence systems can be effectively regenerated after or during an oxidative stress as long as the mitochondria are in an energized state. Energization of mitochondria mainly depends on the availability of suitable respiratory substrates which can provide hydrogen for the reduction of either the glutathione- or -tocopherol-system, since GSH is regenerated by glutathione reductase with the substrate NADPH and the -tocopheroxyl-radical likely by reduced coenzyme Q. It was shown that mitochondria do not undergo damages as long as they can keep a high energy state. The delicate balance between prooxidative/antioxidative activities can be shifted towards oxidation, if experimentally prooxidants were added. After exhaustion of the antioxidative defence systems damages of rnitochondrial functions become expressed followed by membrane injuries along with the oxidation and degradation of mitochondrial lipids and proteins leading finally to the total degradation of the mitoc hondria.Extramitochondrial antioxidants may assist the mitochondrial antioxidative defence systems in a complex way, whereby particularly ascorbic acid can act both as prooxidant and as antioxidant. (Mol Cell Biochem 174: 199–205, 1997) 相似文献
9.
Although manganese (Mn) is an essential element, exposure to excessive levels of Mn and its accumulation in the brain can
cause neurotoxicity and extrapyramidal syndrome. We have investigated the differences in the accumulated levels of Mn, the
degree of lipid peroxidation, and its effects on the levels of trace elements (Fe, Cu, and Zn) in various regions in the brain
of rats having undergone acute Mn exposure. The rats in the dose—effect group were injected intraperitoneally (ip) with MnCl2 (25, 50, or 100 mg MnCl2/kg) once a day for 24 h. The Mn significantly accumulated (p<0.05) in the frontal cortex, corpus callosum, hippocampus, striatum, hypothalamus medulla, cerebellum, and spinal cord in
each case. The rats in the timecourse group were ip injected with MnCl2 (50 mg MnCl2/kg) and then monitored 12, 24, 48, and 72 h after exposure. The Mn accumulated in the frontal cortex, corpus callosum, hippocampus,
striatum hypothalamus, medulla, cerebellum, and spinal cord after these periods of time, In both the dose—effect and time-course
studies, we observed that the concentration of malondialdehyde, an end product of lipid peroxidation, increased significantly
in the frontal cortex, hippocampus, striatum, hypothalamus, medulla, and cerebellum. However, no relationship between the
concentrations of Mn in the brain and the extent of lipid peroxidation was observed. In addition, we found that there was
a significant increase (p<0.05) in the level of Fe in the hippocampus, striatum, hypothalamus, medulla, and cerebellum, but the Cu and Zn levels had
not changed significantly. These findings indicated that Mn induces an increase in the iron level, which provides direct evidence
for Fe-mediated lipid peroxidation in the rats' brains; these phenomena might play important roles in the mechanisms of Mn-induced
neurotoxicology. 相似文献
10.
The effect of the liver mitogen, lead nitrate [Pb(NO3)2], on protein-undernutrition-induced increased lipid peroxidation and reduced antioxidants levels was investigated in rats.
Animals were divided into four groups: A, B, C, and D of five animals each. Animals in groups C and D were placed on a low-protein
diet (5% casein) and animals in groups A and B were maintained on a normal diet (16% casein) for 14 wk and fed ad libitum.
Animals in groups B and D were each given a single intravenous injection of Pb(NO3)2 (100 μmol/kg body weight) 72 h before sacrifice. The results confirm that protein undernutrition (PU) induced an increase
in lipid peroxidation with concomitant reductions in catalase (CAT) activity, glutathione (GSH) level, and superoxide dismutase
(SOD) activity. Lead (Pb) treatment, however, provoked increased lipid peroxidation, CAT activity, and GSH level but resulted
in reduced SOD activity in both normal and PU-rats. These results suggest that Pb exacerbates liver lipid peroxidation in
PU rats and suggests the involvement of free radicals in the pathogenesis of Pb poisoning. In addition, the results show that
Pb affects well-fed and PU rats in similar ways but that the CAT activity of PU rats is more sensitive to the effect of Pb
than that of normal rats. 相似文献
11.
Alexandrova A Petrov L Georgieva A Kirkova M Kukan M 《Cell biochemistry and function》2008,26(3):392-398
In vivo effects of N-benzyloxycarbonyl (Cbz)-Leu-Leu-leucinal (MG132) on chymotryptic-like (ChT-L), tryptic-like, and post-glutamyl peptide hydrolytic-like proteasome activities, protein oxidation, lipid peroxidation (LP), glutathione (GSH) level, as well as on the activity of antioxidant enzymes (superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GSH-Px), and glutathione-reductase) in the rat liver were studied. The possibility of MG132 provoking the formation of free oxygen radicals was also assayed in primary hepatocytes. The following results were obtained: (1) In vivo, MG132 did not change the spontaneous LP, but increased Fe-induced LP and the amount of oxidized proteins; it decreased the GSH level in liver. From the proteasome activities studied in liver cytosol only ChT-L activity was significantly decreased after MG132 administration. Furthermore, MG132 increased antioxidant enzyme activities of SOD, CAT, and GSH-Px. (2) In vitro, MG132 increased free radical oxygen species in hepatocytes; this effect disappeared in the presence of CAT or mannitol. In conclusion, since nowadays proteasome inhibitors are entering into the swing of laboratory and clinical practice, the present data could provide useful information for MG132 action. Consequently, future in vivo experiments with MG132 could highlight the possibility of its use at different pathological conditions. 相似文献
12.
Studies on spice principles as antioxidants in the inhibition of lipid peroxidation of rat liver microsomes 总被引:6,自引:0,他引:6
Polyunsaturated fatty acids (PUFA) are vulnerable to peroxidative attack. Protecting PUFA from peroxidation is essential to utilize their beneficial effects in health and in preventing disease. The antioxidants vitamin E, t-butylhydroxy toluene (BHT) and t-butylhydroxy anisole (BHA) inhibited ascorbate/Fe2+-induced lipid peroxidation in rat liver microsomes. In addition, a number of spice principles, for example, curcumin (5–50 µM) from turmeric, eugenol (25–150 µM) from cloves and capsaicin (25–150 µM) from red chillies inhibited lipid peroxidation in a dose-dependent manner. Zingerone from ginger inhibited lipid peroxidation at high concentrations (> 150 µM) whereas linalool (coriander), piperine (black pepper) and cuminaldehyde (cumin) had only marginal inhibitory effects even at high concentrations (600 µM). The inhibition of lipid peroxidation by curcumin and eugenol was reversed by adding high concentrations of Fe2+. 相似文献
13.
Khan SM 《Cell biochemistry and function》2006,24(4):327-332
Sub-acute hepatotoxicity was induced in mice by exposure to pesticides. The effect of pretreatment with aqueous black tea extract on lipid peroxidation and antioxidants in the liver was investigated. Administering a combination dose of chlorpyriphos and cypermethrin (20 mg kg(-1) each) on alternate days over a 15-day period to male mice resulted in induction of sub-acute toxicity as reflected by elevated levels of liver damage marker enzymes alkaline phosphatase(ALP), aspartate transaminase(AST) and alanine transaminase(ALT). Significantly elevated levels of lipid peroxidation were observed in the experimental group (group III) as compared with control mice. Decreased activities of superoxide dismutase (SOD), catalase (CAT), reduced glutathione (GSH), total thiol, glutathione peroxidase (GPx), glutathione reductase(GR) and glutathione-S-transferase (GST) were also observed in pesticide-treated as compared to control mice. Aqueous black tea extract was given as a pretreatment to group IV mice at a dose of 200 mg ml(-1) polyphenols before the pesticide dose, which significantly decreased the levels of lipid peroxidation and significantly elevated the activities of SOD, CAT, GSH, total thiol, GPx, GR and GST in liver to levels similar to the controls. Thus, the data offer support for the claim that the central mechanism of pesticide action occurs via changes in cellular oxidative status and shows conclusively that supplementation with black tea extract protects against the free radical-mediated oxidative stress in hepatocytes of animals with pesticide-induced liver injury. 相似文献
14.
Ogasawara Y Ohata E Sakamoto T Ishii K Takahashi H Tanabe S 《Biological trace element research》2003,96(1-3):191-201
We have developed a rat model to investigate the relationship between aluminum exposure and aluminum accumulation, and with
oxidative damage in brain tissues. Intraperitoneal injections of aluminum lactate for 7 wk (the total aluminum dosage per
rat was approx 100 mg) significantly increased aluminum levels in the brain. The concentration of lipid peroxidation products
(thiobarbituric acid-reactive substances [TBARS]) also increased in the brain following aluminum lactate injections. No significant
correlations between the concentrations of aluminum and of TBARS were found in the whole brain. Subcellular analysis revealed
that aluminum lactate injections led to a significant increase in the concentration of aluminum in the mitochondrial fraction
but had no significant effect on the concentration of peroxides in any subcellular fraction.
These results suggest that aluminum accumulation induced by the aluminum lactate administration associates with the acceleration
of lipid peroxidation in rat brain. Furthermore, these data indicate that the pro-oxidant effect of aluminum may be indirect
and concentration independent. The experimental conditions used here provide an animal model of aluminum accumulation in the
brain that should prove useful for further investigations of the mechanisms of aluminum neurotoxicity. 相似文献
15.
The aim of this work was to determine the protective effects of intraperitoneally administered vitamin E and selenium (as
Na2SeO3, Se) on the lipid peroxidation as thiobarbituric acid reactive substances (TBARS) and vitamin E levels, glutathione peroxidase
(GSH-Px), reduced glutathione (GSH) activities in the plasma, red blood cell (RBC), liver, and muscle of rats with streptozotocin-induced
diabetes. Fifty adult male Wistar rats were used and all rats were randomly divided into five groups. The first group was
used as a control and the second group as a diabetic control. A placebo was given to first and second groups by injection.
The third group was intraperitoneally administered with vitamin E (20 mg over 24 h), the fourth group with Se (0.3 mg over
24 h), and the fifth group with vitamin E and Se combination (COM) (20 mg vitamin E + 0.3 mg Se over 24 h). This administration
was done for 25 days and the TBARS, vitamin E, GSH-Px, GSH levels in the plasma, RBC, liver, and muscle samples were determined.
The vitamin E level in the plasma and liver was significantly (p < 0.05) higher in the control than in the diabetic control group. Also, the TBARS levels in the RBC, liver, and muscle were
significantly (p < 0.05) lower in the control than in the diabetic control group. However, GSH-Px and GSH activities in RBC, liver, and muscle
were not statistically different between the control and the diabetic control groups. The vitamin E levels in plasma and liver
(p < 0.01 and p < 0.001) and GSH-Px activities (p < 0.01, p < 0.001) in RBC were significantly higher in vitamin E, Se, and COM groups than in both control and diabetic control groups.
However, the TBARS levels of RBC, muscle, and liver in vitamin E and Se administered groups were significantly (p < 0.05-p < 0.001, respectively) decreased. These results indicate that intraperitoneally administered vitamin E and Se have significant
protective effects on the blood, liver, and muscle against oxidative damage of diabetes.
The abstract of this study was presented in Physiological Research
48(Suppl. 1), S99 (1999). 相似文献
16.
Deger Y Dede S Belge A Mert N Kahraman T Alkan M 《Biological trace element research》2003,94(2):149-156
The aim of this study was to investigate the effects of supplemental antioxidant vitamins and minerals on lipid peroxidation
and on the antioxidant systems in rabbits exposed to X-rays. The rabbits were divided into two experimental groups and one
control group, each group containing seven rabbits. The first group (VG) received daily oral doses of vitamin E (460 mg/kg
live weight) and vitamin C (100 mg/kg live weight). The second group (MG) was fed a mineral-enriched diet that contained 60
mg manganese chloride, 40 mg zinc sulfate, and 5 mg copper sulfate per kilogram of feed. The third group served as controls
and received only a standard diet. Blood samples were obtained before and after the supplementation with vitamins or minerals,
as well as before and after irradiation with a total dose of 550-rad X-rays. The blood samples were analyzed for their content
of malondialdehyde (MDA), plasma vitamins C and E, retinol, reduced glutathione (GSH), and glutathione peroxidase activity
(GPx). After irradiation, the control group showed increased levels of MDA and activity of GPx (p<0.05), whereas the levels of GSH, vitamin C, and vitamin E were decreased. In the VG, the concentration of MDA was lower
(p<0.05), and the concentration of GSH and vitamins C and E were higher (p<0.05) when compared to controls. In the MG, the concentrations of MDA, GSH, vitamin C, and retinol were not affected by the
mineral administration and radiation. The level of vitamin E in the MG increased with mineral administration (p<0.05), but decreased after irradiation (p<0.05). For the control group, the level of GSH was higher than in the two experimental groups. After irradiation, the VG
animals had vitamin E and C levels that were higher than in MG and control groups (p<0.05). The activity of GPx was not affected by vitamin or mineral supplementation or by irradiation. We conclude that the
supplementation with antioxidant vitamins and minerals may serve to reinforce the antioxidant systems, thus having a protective
effect against cell damage by X-rays. 相似文献
17.
This study was undertaken to investigate the effects of zinc on lipid peroxidation and various antioxidative enzymes in the
intestines of male Wistar rats fed on ethanol. It was observed that NADPH-dependent lipid peroxidation (LP) was significantly
increased upon ethanol treatment for 4 and 8 wk. The concentraton of glutathione as well as the activities of catalase, superoxide
dismutase (SOD), glutathione peroxidase (GPx), and glutathione reductase (GR) were also found to be significantly increased
upon ethanol feeding at all of the treatment intervals. The glutathione levels were found to be further elevated upon combined
zinc and ethanol treatments. Interestingly, the administration of zinc to ethanol-fed rats was able to bring down the elevated
levels of LP, catalase, SOD, and GPx, thus indicating the antiperoxidative potential of zinc under such conditions. 相似文献
18.
Gurkan F Atamer Y Ece A Kocyigit Y Tuzun H Mete M 《Biological trace element research》2004,100(2):97-104
Thirty-four infants with acute bronchiolitis and 25 age-matched healthy controls were enrolled to investigate the possible
relationship between serum malondialdehyde (MDA) and selenium (Se) levels and the occurrence and severity of acute bronchiolitis
in children. Serum samples were taken for serum Se and MDA measurements, and the clinical score was assessed at admission.
Blood was taken again from the children with bronchiolitis at 2 mo after discharge from the hospital. Mean serum MDA levels
were significantly higher in patients with acute bronchiolitis than at the postbronchiolitis stage and the controls (4.2±2.5nmol./L,
1.4±0.8 nmol/L, and 0.7±0.2 nmol/L, respectively [p<0.001]). Infants with bronchiolitis had lower mean serum Se levels at the acute stage than after 2 mo (31.7±28.9μg/L versus
68.4±26.4 μg/L, p<0.05, respectively); both of which were significantly lower than the control group measurements (145.0±21.9 μg/L) (p<0.001). There was a negative correlation between serum MDA and Se levels in the patient group (=−0.85, p<0.001). The age of the patient, child's immunization status, parental smoking habit, and family crowding index were not correlated
with serum Se, MDA levels, or clinical score at admission.
In conclusion, increased MDA levels and impaired Se status demonstrate the presence of possible relationship of these parameters
with pathogenesis of acute bronchiolitis, and antioxidant supplementation with Se might be thought to supply a beneficial
effect against bronchiolitis. 相似文献
19.
Salt stress-induced changes in antioxidant enzymes, such as catalase (CAT), ascorbate peroxidase (APX), and glutathione reductase (GR), total chlorophyll content, and lipid peroxidation measured as malondialdehyde (MDA) content, in leaves of a green bean genotype Gevas sirsk 57 (GS57) and cv. Fransiz 4F-89 differing in salt tolerance were investigated. Plants were subjected to three salt treatments (0, 50, and 100 mM NaCl) under controlled climatic conditions for 7 days. The salt-sensitive cv. 4F-89 exhibited a decrease in GR activity at all salt treatments, but the salt-tolerant genotype GS57 showed only a slight decrease in GR under 50 mM salt treatment and an increase under 100 mM salt treatment. CAT and APX activities increased with increasing salt stress in both varieties. CAT and APX activities were higher in the salt-tolerant GS57 than salt-ensitive cv. 4F-89. The two varieties showed an increase in MDA content with an increase in salinity, but the increase in sensitive cv. 4F-89 under salt stress was higher than that in salt-tolerant GS57 genotype. The increasing NaCl concentration caused a reduction in the chlorophyll content in cv. 4F-89 but not in GS57. 相似文献
20.
Effect of cadmium on lipid peroxidation and activities of antioxidant enzymes in growing pigs 总被引:1,自引:0,他引:1
Malondialdehyde (MDA), glutathione (GSH) content, total antioxidant capacity (T-AOC) levels, superoxide dismutase (SOD), glutathione
peroxidase (GSH-Px), and glutathione transferase (GST) activities were studied in serum, liver, and kidney of growing pigs
after graded doses of cadmium administration in diets. One hundred ninety-two barrows (Duroc x Landrace x Yorkshire), with
similar initial body weight 27.67±1.33 kg, were randomly allotted into 4 different treatments with 3 replications (16 pigs
per replication). The treatments received the same basal diet added with 0, 0.5, 5.0, and 10.0 mg/kg cadmium (as CdCl2), respectively. The results showed pigs treated with 10 mg/kg cadmium significantly decreased average daily gain (ADG) (p<0.05) and increased feed/gain ratio (F/G) (p<0.05) compared to the control. In this treatment, the contents of MDA increased significantly (p<0.05), GSH concentrations, T-AOC levels, and the activities of SOD, GSH-PX, and GST decreased significantly (p<0.05). The results indicate 10 mg/kg cadmium could decrease pig antioxidant capacity after extended exposure and cadmium-induced
increase lipid peroxidation might not be only the result of the possibility of lower level of GSH but could also be as a result
of direct action of cadmium on peroxidation reaction. 相似文献