1.Protection against doxorubicin-induced oxidative damage in normal blood cells by naringenin.
Ying-Qian FENG ; Xue-Lan ZUO ; Rui-Fang LI ; Ke-Jian ZHANG ; Fei CHEN ; Hui XIAO
Journal of Experimental Hematology 2008;16(4):790-793
The objective of this study was to investigate the protection by naringenin against doxorubicin-induced oxidative damage in normal blood cells. Inhibiting effects of naringenin, doxorubicin and naringenin combined with doxorubicind on K562 cells and polymorphonuclear leukocytes were detected with MTT method, the level of reactive oxygen species (ROS) and lipid peroxidation (MDA), the activity of superoxide dismutase (SOD) and glutathione peroxidase (GSH-Px) were examined with spectrophotometric method in the K562 cells and polymorphonuclear leukocytes. The results indicated that the proliferation of K562 cells was not inhibited by the cytotoxicity of doxorubicin in combination of naringenin with doxorubicin. As compared with the doxorubicin, the addition of naringenin after doxorubicin for 1 hour, the levels of reactive oxygen species (ROS) and lipid peroxidation (MDA) obviously decreased, the activity of superoxide dismutase (SOD) and glutathione peroxidase (GSH-Px) obviously increased in the polymorphonuclear leukocytes, but these were not changed obviously in K562 cells. It is concluded naringenin can protect against doxorubicin-induced oxidative damage in normal blood cells. The mechanism of naringenin may be elevating activities of antioxidant enzyme and degrading oxidative production level in normal blood cells, and meanswhile decreasing level of oxidative products.
Antioxidants
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pharmacology
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Doxorubicin
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adverse effects
;
Erythrocytes
;
drug effects
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Flavanones
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pharmacology
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Humans
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Oxidative Stress
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Reactive Oxygen Species
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metabolism
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Superoxide Dismutase
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metabolism
2.Experimental studies of Panax notoginseng saponins and Ginkgo biloba extracts on preventing acute oxygen toxicity.
Run-ping LI ; Yong-bing CAO ; Han-ming ZHANG ; Heng-yi TAO ; Xue-jun SUN ; Lin LU ; Xiong-fei XU
Chinese Journal of Applied Physiology 2004;20(2):201-204
AIMTo investigate the preventive effects of Panax notoginseng saponins (PNS) and Ginkgo biloba extracts (GbE) on acute oxygen toxicity and the possible mechanisms.
METHODSMice were injected intraperitoneally with PNS and GbE for 5 days, then were exposed to 500 kPa hyperbaric oxygen (HBO) for 60 min, the convulsion latency, times and interval were observed. Moreover, reactive oxygen (RO) unit, MDA, NO, GSH levels and GSH-Px, CAT, MAO activities of mice brain were determined after they were exposed to HBO for 15 min.
RESULTSPNS and GbE could markedly prolong the convulsion latency and interval, reduce convulsion times, decrease contents of MDA and NO in mice brain, keep RO unit, GSH and GSH-Px at higher levels, but had no effects on CAT and MAO activities.
CONCLUSIONPNS and GbE could effectively prevent acute oxygen toxicity, which were related to their antioxidant activities.
Animals ; Antioxidants ; pharmacology ; Diving ; adverse effects ; Ginkgo biloba ; Hyperbaric Oxygenation ; adverse effects ; Male ; Mice ; Oxygen ; poisoning ; Panax notoginseng ; Phytotherapy ; Plant Extracts ; pharmacology ; Saponins ; pharmacology
3.Studies on external auditory canal injury in rabbits under simulated 50 mnitrogen-oxygen saturation diving and protective effect of compound aluminium acetate solution.
Ming-ke WANG ; Jian-bo BA ; Wen-bin WU ; Xiong-li XU ; Jia HE
Chinese Journal of Applied Physiology 2016;32(1):58-64
Acetates
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pharmacology
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Animals
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Disease Models, Animal
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Diving
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adverse effects
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Ear Canal
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injuries
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Nitrogen
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Oxygen
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Protective Agents
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pharmacology
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Rabbits
4.Effect and mechanism of methyl protodioscin in protecting cardiomyocytes against anoxia/reoxygenation injury.
Zong NING ; Yi-kui LI ; Yan ZHOU
Chinese Journal of Integrated Traditional and Western Medicine 2010;30(4):407-409
OBJECTIVETo study the effect and mechanism of methyl protodioscin (MPD), an active ingredients of yamogenin, in protecting cardiomyocytes (CMC) against anoxia/reoxygenation (A/R) injury.
METHODSCultured CMCs of neonatal SD rats were randomly divided into three groups, cells in Group A were untreated normal cells, cells in Group B and C were made to injury CMC model by A/R, and only those in Group C were treated with MPD. Levels of ATPase activity and lactate dehydrogenase (LDH) in cell membrane of CMCs were determined. Besides, the mRNA expression of sodium-calcium exchanger (NCX) in MPD treated CMCs was detected.
RESULTSAs compared with Group B, the degree of CMC injury was significantly milder and the activities of Na+ -K+ -ATPase and Ca2+ -Mg2+ -ATPase were higher in Group C after cells were treated with MPD in concentration of 10 microg/mL and 50 microg/mL. The mRNA expression of NCX in CMCs was down-regulated after MPD treatment (P < 0.05).
CONCLUSIONMPD could maintain the low calcium internal environment in CMCs by way of protecting the membranous function of Na+ -pump and Ca2+ -pump, and influencing the Ca2+ transmembrane transportation in CMCs.
Animals ; Cell Hypoxia ; Cells, Cultured ; Diosgenin ; analogs & derivatives ; pharmacology ; Myocardial Reperfusion Injury ; metabolism ; Myocytes, Cardiac ; drug effects ; metabolism ; Oxygen ; adverse effects ; Rats ; Rats, Sprague-Dawley ; Saponins ; pharmacology
5.Protective effect of dexmedetomidine against glutamate-induced cytotoxicity in PC12 cells and its mechanism.
Wei-Dong ZHANG ; Hao ZHANG ; Hai WANG ; Na ZHANG ; Chun-Yan DU ; Jun YU ; Ze-Guo FENG
Journal of Southern Medical University 2016;37(2):150-156
OBJECTIVETo investigate the protective effects of dexmedetomidine (Dex) against glutamate-induced cytotoxicity in PC12 cells and its mechanism.
METHODSPC12 cells were treated with varying concentrations of dexmedetomidine 1 h before exposure to a high concentration of glutamate. The cell viability was measured by MTT assay, and LDH release, MDA content and SOD activity were measured. The level of ROS was tested by DCFH-DA staining and flow cytometry. The level of intracellular Cawas detected by Fluo-8 staining and flow cytometry, and the mitochondrial membrane potential (MMP) was determined with JC-1 staining and flow cytometry.
RESULTSWithin the concentration range of 0.01 to 100 µmol/L, Dex dose-dependently protected PC12 cells against glutamate-induced cytotoxicity. Treatment with 100 µmol/L Dex significantly increased the cell viability to (86.6∓2.2)% of that of the control cells (P<0.01) and decreased LDH release to 1.4∓0.1 folds of the control level (P<0.01). In PC12 cells exposed to glutamate, Dex pretreatment significantly reduced MDA content (P<0.01), enhanced SOD activity (P<0.01), inhibited ROS overproduction (P<0.01), reduced intracellular Calevel (P<0.01) and maintained a stable MMP (P<0.01).
CONCLUSIONDexmedetomidine can protect PC12 cells against glutamate-induced injury possibly in relation with its anti-oxidative activity, inhibitory effect on intracellular calcium overload and protective effect of the mitochondria.
Animals ; Apoptosis ; Calcium ; metabolism ; Cell Survival ; drug effects ; Dexmedetomidine ; pharmacology ; Glutamic Acid ; adverse effects ; Membrane Potential, Mitochondrial ; Mitochondria ; drug effects ; metabolism ; PC12 Cells ; Rats ; Reactive Oxygen Species ; metabolism
6.Antioxidant vitamin and male reproduction.
Wanjian GU ; Xuejun SHANG ; Yufeng HUANG
National Journal of Andrology 2004;10(8):627-631
Increased generation of ROS causes the lipid oxidation of the membrane of spermatozoa, but antioxidant vitamins play an important role in reproduction and help clear away ROS and protect the sperm membrane from lipid oxidation. This review focused on the effect of antioxidant vitamins on male reproduction and in the treatment of male infertility.
Animals
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Antioxidants
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pharmacology
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therapeutic use
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Ascorbic Acid
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pharmacology
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therapeutic use
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Humans
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Infertility, Male
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drug therapy
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Lipid Peroxidation
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drug effects
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Male
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Reactive Oxygen Species
;
adverse effects
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Reproduction
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drug effects
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Vitamin A
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pharmacology
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therapeutic use
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Vitamin E
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pharmacology
;
therapeutic use
7.Green Tea Polyphenols Attenuate High-Fat Diet-Induced Renal Oxidative Stress through SIRT3-Dependent Deacetylation.
Hui YANG ; Xue Zhi ZUO ; Chong TIAN ; Dong Liang HE ; Wei Jie YI ; Zhuo CHEN ; Pi Wei ZHANG ; Shi Bin DING ; Chen Jiang YING
Biomedical and Environmental Sciences 2015;28(6):455-459
Fifty male Wistar rats were fed a standard chow diet or a high-fat (HF) diet, and different concentrations of green tea polyphenols (GTPs) (0.8, 1.6, and 3.2 g/L) were administered in the drinking water. We found that the malondialdehyde (MDA) level in the HF diet group was significantly higher than that in the control (CON) group (P<0.05). Decreased peroxisome proliferator-activated receptor (PPAR)-α and sirtuin 3 (SIRT3) expression, and increased manganese superoxide dismutase (MnSOD) acetylation levels were also detected in the HF diet group (P<0.05). GTP treatment upregulated SIRT3 and PPARα expression, increased the pparα mRNA level, reduced the MnSOD acetylation level, and decreased MDA production in rats fed a HF diet (P<0.05). No significant differences in total renal MnSOD and PPAR-γ coactivator-1α (PGC1-α) expression were detected. The reduced oxidative stress detected in kidney tissues after GTP treatment was partly due to the higher SIRT3 expression, which was likely mediated by PPARα.
Acetylation
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drug effects
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Animals
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Antioxidants
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pharmacology
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Diet, High-Fat
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adverse effects
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Gene Expression Regulation, Enzymologic
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drug effects
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Kidney
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drug effects
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metabolism
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Male
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Oxidative Stress
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drug effects
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Polyphenols
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pharmacology
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Rats
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Rats, Wistar
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Reactive Oxygen Species
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metabolism
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Sirtuin 3
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metabolism
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Tea
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chemistry
8.Adiponectin up-regulates the expression of T-cadherin in cardiomyocytes injured by hypoxia/reoxygenation.
Min WANG ; Ying-Ru CHAI ; Chuan-Shi XIAO ; Xu-Jing ZHAO ; Na WEI ; Rui BAI ; Yun-Fei BIAN
Acta Physiologica Sinica 2012;64(3):296-302
The aim of the present study was to investigate the effects of adiponectin (APN) on the expression of T-cadherin in cultured Sprague-Dawley (SD) rat cardiomyocytes injured by hypoxia/reoxygenation (H/R). Primary myocardial cells from neonatal rats were obtained by enzymatic digestion. The cells were divided into control group, H/R group and H/R+APN (3, 10, 20 and 30 μg/mL) groups. The H/R group was incubated in anoxic environment (anoxic solution saturated with high concentration N2) for 3 h, and then in the reoxygenation environment (the reoxygenation solution saturated with pure oxygen) for 1 h. The H/R+APN group was pretreated with different concentrations of APN for 24 h prior to the initiation of H/R. The content of lactate dehydrogenase (LDH) was measured by chemistry chromatometry. Cellular apoptosis was analyzed by flow cytometry and terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling (TUNEL). The expression of T-cadherin was detected by RT-PCR and Western blotting. The results showed that, compared with control group, the apoptotic rate and release of LDH were significantly increased in the H/R group, whereas the expressions of T-cad mRNA and protein were decreased. Pretreating with APN significantly and dose-dependently decreased apoptotic rate and LDH release, and up-regulated T-cad mRNA and protein level in rat neonatal cardiomyocytes under H/R conditions. These results suggest that APN may protect cardiomyocytes against H/R-induced injury by up-regulating H/R-decreased T-cad expression.
Adiponectin
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pharmacology
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Animals
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Apoptosis
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Cadherins
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metabolism
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Cell Hypoxia
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L-Lactate Dehydrogenase
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metabolism
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Myocytes, Cardiac
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drug effects
;
metabolism
;
pathology
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Oxygen
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adverse effects
;
Rats
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Rats, Sprague-Dawley
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Up-Regulation
9.The effect of N-acetyl-L-cysteine on endoplasmic reticulum stress mediated apoptosis of HepG2 cells.
Yun-ye LIU ; Qing XIE ; Hui WANG ; Lan-yi LIN ; Shan JIANG ; Xia-qiu ZHOU ; Hong YU ; Qing GUO
Chinese Journal of Hepatology 2008;16(7):524-527
OBJECTIVETo analyze the mechanisms of NAC on endoplasmic reticulum (ER) stress mediated cells apoptosis of HepG2 cells and to evaluate the potential role of NAC in the treatment of liver injury.
METHODSHepG2 cells were treated with H2O2 to make a model of oxidative ER stress mediated apoptosis. To evaluate the apoptosis, various methods such as MTT, DNA ladder, Western blot and flow cytometry were used. Then the optimal dosage and incubation time of NAC intervention in apoptosis were ascertained, and the differences between induction and intervention of apoptosis, including the percentage of apoptosis, the expression of apoptotic protein (GRP78, Caspase-12, PARP) and the production of reactive oxygen species (ROS) were compared.
RESULTSThe activity of the cells decreased by H2O2 (0, 1, 3, 5 mmol/L) treatments in a dose-dependent manner. The ratio of apoptotic cells increased (0.7%+/-0.5%, 26.4%+/-1.8%, 29.7%+/-1.2% and 51.2%+/-9.4%, respectively) as did the production of ROS (14.0%+/-0.5%, 95.2%+/-0.1%, 97.5%+/-0.2% and 98.3%+/-0.2%, respectively). The HepG2 cells showed typical morphologic change of ER stress 6 hr after they were treated with 3 mmol/L H2O2. ER stress mediated-apoptosis was confirmed by Western blot. NAC (10 mmol/L and 20 mmol/L) protected cells from apoptosis. Typical features of ER stress apoptosis were seen accompanied by diminishing the ratio of apoptotic cells from 29.7%+/-1.2% to 23.3%+/-4.7% and 14.3%+/-1.2%. The production of ROS also decreased from 97.5%+/-0.2% to 52.2%+/-0.8% and 51.2%+/-2.9%. The effect was related to the concentration: 20 mmol/L NAC was more effective than 10 mmol/L.
CONCLUSIONSAs an oxidizing agent, H2O2 may induce ROS in cells and induce oxidative stress, causing ER stress and apoptosis. NAC can inhibit the procession of ROS directly and prevent injuries to the hepatocytes.
Acetylcysteine ; pharmacology ; Apoptosis ; drug effects ; Endoplasmic Reticulum ; metabolism ; Hep G2 Cells ; Humans ; Hydrogen Peroxide ; Oxidative Stress ; Reactive Oxygen Species ; adverse effects
10.Resveratrol protects human sperm against cryopreservation-induced injury.
Shi-Jia LI ; Wei-Dong SU ; Li-Jun QIU ; Xiong WANG ; Juan LIU
National Journal of Andrology 2018;24(6):499-503
ObjectiveTo investigate the effects of resveratrol in the cryopreservation medium on the quality and function of post-thaw sperm.
METHODSSemen samples were obtained from 50 normozoospermic and 50 oligoasthenozoospermic men, liquefied and then cryopreserved in the glycerol-egg yolk-citrate (GEYC) medium with or without 30 μmol/L resveratrol. Sperm motility, viability and acrosome reaction (AR) were examined before and after thawing. Sperm lipid peroxidation and the level of reactive oxygen species (ROS) were measured using commercial malondialdehyde (MDA) and the ROS assay kit. Sperm mitochondrial membrane potential (MMP) and DNA damage were determined by Rhodamine 123 staining and TUNEL.
RESULTSThe percentage of progressively motile sperm (PMS), total sperm motility, sperm viability, MMP and AR were significantly decreased (P <0.05) while the levels of sperm ROS, MDA and DNA fragmentation index (DFI) remarkably increased in both the normozoospermia and oligoasthenozoospermia groups after cryopreservation as compared with those in the fresh ejaculate (P <0.05). In comparison with the non-resveratrol control, the post-thaw sperm cryopreserved with 30 μmol/L resveratrol showed markedly higher PMS ([32.7 ± 4.8] vs [43.1 ± 6.3] %, P <0.05), total motility ([44.8 ± 6.9] vs [56.9 ± 7.4] %, P <0.05), viability ([52.3 ± 6.1] vs [67.5 ± 5.6] %, P <0.05), MMP ([56.5 ± 7.0] vs [63.4 ± 7.5] %, P <0.05) and AR ([16.6 ± 3.8] vs [26.3 ± 4.7] %, P <0.05) but lower ROS, MDA and DFI (all P <0.05) in the normozoospermia group, and so did the post-thaw sperm in the oligoasthenozoospermia group, with a particularly lower DFI ([28.5 ± 4.8] vs [36.3 ± 5.7]%, P <0.01).
CONCLUSIONSResveratrol in the cryopreservation medium can improve the quality and function of post-thaw human sperm by reducing cryopreservation-induced sperm injury and the level of ROS.
Acrosome ; drug effects ; Animals ; Antioxidants ; pharmacology ; Cryopreservation ; methods ; DNA Fragmentation ; Humans ; Lipid Peroxidation ; Male ; Malondialdehyde ; Membrane Potential, Mitochondrial ; Reactive Oxygen Species ; analysis ; Resveratrol ; pharmacology ; Semen Analysis ; Semen Preservation ; adverse effects ; Sperm Motility ; drug effects ; Spermatozoa ; drug effects ; physiology