Aim: To evaluate the effect of methoxychlor on the antioxidant system of goat epididymal sperm. Methods:Epididymis of adult goat was obtained from local slaughter houses and sperm were collected by chopping the epidid...Aim: To evaluate the effect of methoxychlor on the antioxidant system of goat epididymal sperm. Methods:Epididymis of adult goat was obtained from local slaughter houses and sperm were collected by chopping the epididymisin modified Ringer's phosphate solution (RPS). After several washings, the sperm samples were dispersed in RPS andincubated with methoxychlor (1μmol/L, 10μmol/L and 100μmol/L) and methoxychlor + vitamin C (100μmol/Leach) for 3 h at 32℃. After incubation, the sperm motility and viability were assessed. An aliquot of sperm samplewas homogenized, centrifuged and used for the assay of superoxide dismutase, glutathione peroxidase, glutathione re-ductase and lipid peroxidation. Results; In methoxychlor-incubated sperm and in sperm co-incubated with methoxy-chlor and vitamin C, the sperm motility and viability showed no significant changes as compared to the correspondingcontrols. In methoxychlor-incubated sperm the activity of superoxide dismutase, glutathione reductase and glutathioneperoxidase were decreased while lipid peroxidation was increased in a dose-dependent manner. Co-incubation of spermwith methoxychlor and vitamin C showed no changes in the activity of superoxide dismutase, glutathione reductase andglutathione peroxidase and in the level of lipid peroxidation. Conclusion; Methoxychlor induced oxidative stress inepididymal sperm of goats by decreasing the levels of antioxidant enzymes. Co-incubation of sperm with methoxychlorand vitamin C, a natural antioxidant, reversed the effect of methoxychlor. (Asian J Androl 2001 Dec; 3; 285 - 288)展开更多
【目的】探讨甲氧滴滴涕(methoxychlor,MXC)对雄性小鼠生精细胞周期调控因子细胞周期蛋白激酶Ⅰ(p34cdc2)和细胞周期蛋白B1(cyclinB1)表达水平的影响和意义。【方法】40只成年雄性昆明小鼠随机分为四组,其中三组分别喂服不同浓度MXC15天...【目的】探讨甲氧滴滴涕(methoxychlor,MXC)对雄性小鼠生精细胞周期调控因子细胞周期蛋白激酶Ⅰ(p34cdc2)和细胞周期蛋白B1(cyclinB1)表达水平的影响和意义。【方法】40只成年雄性昆明小鼠随机分为四组,其中三组分别喂服不同浓度MXC15天(50,100,150mg/kg body weight/day),另一组为正常对照组。应用免疫组化SABC法检测四组小鼠生精细胞中p34cdc2和cyclinB1的表达情况。【结果】小鼠生精细胞cyclinB1阳性表达部位主要在精原细胞胞核而p34cdc2主要在初级精母细胞胞浆。两种蛋白的表达均受MXC作用的影响,各实验组与对照组比较均明显降低(P<0.001)。各实验组两两比较显示随MXC作用浓度增高两种蛋白表达降低,呈现明显差异(P<0.01)。【结论】MXC可通过抑制生精细胞cyclinB1和p34cdc2的表达干扰细胞周期,产生生殖毒性,且作用强度随MXC浓度增强而增加。对于cyclinB1和p34cdc2的影响作用在不同细胞水平。展开更多
目的探讨甲氧滴滴涕(MXC)对雄性大鼠生精细胞的细胞周期影响。方法实验动物分为对照组,溶剂组,5 d、10 d和15 d MXC实验组。用流式细胞仪检测染毒雄性大鼠生精细胞周期变化。结果随着MXC染毒时间延长与对照组比较,实验组G0/G1期与S期细...目的探讨甲氧滴滴涕(MXC)对雄性大鼠生精细胞的细胞周期影响。方法实验动物分为对照组,溶剂组,5 d、10 d和15 d MXC实验组。用流式细胞仪检测染毒雄性大鼠生精细胞周期变化。结果随着MXC染毒时间延长与对照组比较,实验组G0/G1期与S期细胞数减少,G2/M期细胞数增多(P<0.05),单倍体细胞减少,二倍体与四倍体细胞增多(P<0.05);除5 d实验组二倍体与四倍体细胞荧光强度强外,其余各实验组的单倍体、二倍体和四倍体细胞荧光强度均减弱(P<0.05);溶剂组与对照组间的变化无显著性差异(P>0.05)。结论MXC可引起大鼠睾丸生精细胞S期抑制及G2期阻滞。展开更多
This paper reports on the levels of 8 organochlorine pesticide residues and metabolites in three fish species; Tilapia （Oreochromis leucostictus）. Common carp （Cyprinus carpio） and Mirror carp （Cuprinus spectacul...This paper reports on the levels of 8 organochlorine pesticide residues and metabolites in three fish species; Tilapia （Oreochromis leucostictus）. Common carp （Cyprinus carpio） and Mirror carp （Cuprinus spectacularlus） from Lake Naivasha, Kenya. p,p＇-DDT, p,p＇-DDE, p,p＇-DDD, heptachlor, heptachlor epoxide, aldrin, dieldrin and methoxychlor were analyzed in fish specimens collected from Lake Naivasha during the months of November - December in 2008. The pesticide concentrations （in ~ag/Kg, wet weight） ranged within 0.42-4.185 p,g/Kg, for Heptachlor, BDL-0.291 Heptachlor epoxide, 0.433-4.733 Aldrin, BDL -0.341 Dieldrin, p,p＇ DDT, BDL-6.691 p,p＇ DDE, BDL-27.153 p,p＇ DDD, and BDL-28.867 methoxychlor. The pesticide residue levels varied widely between and within species. C. spectacularhts showed high pesticide levels followed by C. carpio and O. leueostictus respectively; this was attributed to the trophic position and age/size of fish. The occurrences of the pesticides indicate recent use in the catchment. The mean values and ranges of residues found in fish ware below the FAO/WHO maximum acceptable limits in fish and sea food however increased monitoring is recommended to detect any changes.展开更多
文摘Aim: To evaluate the effect of methoxychlor on the antioxidant system of goat epididymal sperm. Methods:Epididymis of adult goat was obtained from local slaughter houses and sperm were collected by chopping the epididymisin modified Ringer's phosphate solution (RPS). After several washings, the sperm samples were dispersed in RPS andincubated with methoxychlor (1μmol/L, 10μmol/L and 100μmol/L) and methoxychlor + vitamin C (100μmol/Leach) for 3 h at 32℃. After incubation, the sperm motility and viability were assessed. An aliquot of sperm samplewas homogenized, centrifuged and used for the assay of superoxide dismutase, glutathione peroxidase, glutathione re-ductase and lipid peroxidation. Results; In methoxychlor-incubated sperm and in sperm co-incubated with methoxy-chlor and vitamin C, the sperm motility and viability showed no significant changes as compared to the correspondingcontrols. In methoxychlor-incubated sperm the activity of superoxide dismutase, glutathione reductase and glutathioneperoxidase were decreased while lipid peroxidation was increased in a dose-dependent manner. Co-incubation of spermwith methoxychlor and vitamin C showed no changes in the activity of superoxide dismutase, glutathione reductase andglutathione peroxidase and in the level of lipid peroxidation. Conclusion; Methoxychlor induced oxidative stress inepididymal sperm of goats by decreasing the levels of antioxidant enzymes. Co-incubation of sperm with methoxychlorand vitamin C, a natural antioxidant, reversed the effect of methoxychlor. (Asian J Androl 2001 Dec; 3; 285 - 288)
文摘【目的】探讨甲氧滴滴涕(methoxychlor,MXC)对雄性小鼠生精细胞周期调控因子细胞周期蛋白激酶Ⅰ(p34cdc2)和细胞周期蛋白B1(cyclinB1)表达水平的影响和意义。【方法】40只成年雄性昆明小鼠随机分为四组,其中三组分别喂服不同浓度MXC15天(50,100,150mg/kg body weight/day),另一组为正常对照组。应用免疫组化SABC法检测四组小鼠生精细胞中p34cdc2和cyclinB1的表达情况。【结果】小鼠生精细胞cyclinB1阳性表达部位主要在精原细胞胞核而p34cdc2主要在初级精母细胞胞浆。两种蛋白的表达均受MXC作用的影响,各实验组与对照组比较均明显降低(P<0.001)。各实验组两两比较显示随MXC作用浓度增高两种蛋白表达降低,呈现明显差异(P<0.01)。【结论】MXC可通过抑制生精细胞cyclinB1和p34cdc2的表达干扰细胞周期,产生生殖毒性,且作用强度随MXC浓度增强而增加。对于cyclinB1和p34cdc2的影响作用在不同细胞水平。
文摘This paper reports on the levels of 8 organochlorine pesticide residues and metabolites in three fish species; Tilapia （Oreochromis leucostictus）. Common carp （Cyprinus carpio） and Mirror carp （Cuprinus spectacularlus） from Lake Naivasha, Kenya. p,p＇-DDT, p,p＇-DDE, p,p＇-DDD, heptachlor, heptachlor epoxide, aldrin, dieldrin and methoxychlor were analyzed in fish specimens collected from Lake Naivasha during the months of November - December in 2008. The pesticide concentrations （in ~ag/Kg, wet weight） ranged within 0.42-4.185 p,g/Kg, for Heptachlor, BDL-0.291 Heptachlor epoxide, 0.433-4.733 Aldrin, BDL -0.341 Dieldrin, p,p＇ DDT, BDL-6.691 p,p＇ DDE, BDL-27.153 p,p＇ DDD, and BDL-28.867 methoxychlor. The pesticide residue levels varied widely between and within species. C. spectacularhts showed high pesticide levels followed by C. carpio and O. leueostictus respectively; this was attributed to the trophic position and age/size of fish. The occurrences of the pesticides indicate recent use in the catchment. The mean values and ranges of residues found in fish ware below the FAO/WHO maximum acceptable limits in fish and sea food however increased monitoring is recommended to detect any changes.
