Zygosaccharomyces rouxii is a salt-tolerant yeast species capable of removing cadmium(Cd) pollutant from aqueous solution. Presently, the physiological characteristics of Z. rouxii under the stress of sodium chloride(...Zygosaccharomyces rouxii is a salt-tolerant yeast species capable of removing cadmium(Cd) pollutant from aqueous solution. Presently, the physiological characteristics of Z. rouxii under the stress of sodium chloride(NaCl) and Cd are poorly understood. This study investigated the effects of NaCl and Cd on the growth, oxidative stress and antioxidant enzyme activities of Z. rouxii after stress treatment for 24 h. Results showed that NaCl or Cd alone negatively affected the growth of Z. rouxii, but the growth-inhibiting effect of Cd on Z. rouxii was reduced in the presence of NaCl. Flow cytometry assay showed that under Cd stress, NaCl significantly reduced the production of reactive oxygen species(ROS) and cell death of Z. rouxii compared with those in the absence of NaCl. The activities of superoxide dismutase(SOD), catalase(CAT), and peroxidase(POD) of Z. rouxii were significantly enhanced by 2%–6% NaCl, which likely contributed to the high salt tolerance of Z. rouxii. The POD activity was inhibited by 20 mg L-1Cd while the SOD and CAT activities were enhanced by 8 mg L-1 Cd and inhibited by 20 mg L-1 or 50 mg L-1 Cd. The inhibitory effect of high-level Cd on the antioxidant enzyme activities of Z. rouxii was counteracted by the combined use of NaCl, especially at 6%. This probably accounted for the decrease in Cd-induced ROS production and cell death of Z. rouxii after incubation with NaCl and Cd. Our work provided physiological clues as to the use of Z. rouxii as a biosorbent for Cd removal from seawater and liquid highly salty food.展开更多
Objective: To study the reproductive toxicity of cadmium chloride in male mice. Methods: Male mice of 4 weeks old were administered cadium chloride at doses of 0.5, 2 or 8 mg·kg-1·day-1 i.p. for 10 days. At ...Objective: To study the reproductive toxicity of cadmium chloride in male mice. Methods: Male mice of 4 weeks old were administered cadium chloride at doses of 0.5, 2 or 8 mg·kg-1·day-1 i.p. for 10 days. At day 50, the males were mated with virgin females at 1: 2. The pregnancy rate, the litter size and the body weight of the offspring were recorded; at the same time the development of the testis, the testicular index, the germ cell miosis and the epididymal sperm count, motility and malformed sperm were observed in the intoxicated males. Results: The testicular index was lower in the 2 and 8 mg/kg groups than in the controls and 0.5 mg/kg groups (P< 0.05). In the 2 and 8 mg/kg groups, there were testicular maldeve-lopment, epididymal azoospermia and infertility. The pregnancy rate was lower in the 2 mg/kg group than in the control and 0.5 mg/ kg group (P<0.05). The ectopic pregnancy rate of the cadmium chloride group was not significantly different from that of the controls. The sperm count, motility and malformed sperm were not significantly different between the 0.5 mg/kg group and the controls. Conclusion: Cadmium chloride, at doses of 2 mg/kg or more, reduces the pregnancy rate, which may be related to testis maldevelopment and epididymal azoospermia. Androl展开更多
目的:研究镉暴露对雄性小鼠精子生成的影响及其分子机制。方法:分别以1、5、10 μ mol/kg浓度氯化镉腹腔连续暴露小鼠,每天1次,连续5d,测定睾丸指数和精子相对计数;同时应用单细胞凝胶电泳(single-cell gel electrophoresis,SCGE)技术...目的:研究镉暴露对雄性小鼠精子生成的影响及其分子机制。方法:分别以1、5、10 μ mol/kg浓度氯化镉腹腔连续暴露小鼠,每天1次,连续5d,测定睾丸指数和精子相对计数;同时应用单细胞凝胶电泳(single-cell gel electrophoresis,SCGE)技术检测睾丸生精细胞DNA损伤率和迁移长度。结果:三种剂量氯化镉处理组睾丸指数显著低于对照组(P<0.001),睾丸精子相对计数也显著低于对照组(P<0.05、P<0.001),生精细胞DNA损伤率和慧星细胞迁移长度显著高于对照组(P<0.001),且随剂量增加DNA损伤率和慧星细胞迁移长度也显著增加。结论:DNA链断裂可能是镉引起生精障碍的机制之一。展开更多
基金the financial support of the National Natural Science Foundation of China (Grant Nos. 31101330 and 30972289)the Natural Science Foundation of Shandong Province in China (Grant No. ZR2010CM043)+1 种基金the International Joint Research Program (Grant No. 2010DFA31330)the Program for Changjiang Scholars and Innovative Research Team in University (Grant No. IRT1188)
文摘Zygosaccharomyces rouxii is a salt-tolerant yeast species capable of removing cadmium(Cd) pollutant from aqueous solution. Presently, the physiological characteristics of Z. rouxii under the stress of sodium chloride(NaCl) and Cd are poorly understood. This study investigated the effects of NaCl and Cd on the growth, oxidative stress and antioxidant enzyme activities of Z. rouxii after stress treatment for 24 h. Results showed that NaCl or Cd alone negatively affected the growth of Z. rouxii, but the growth-inhibiting effect of Cd on Z. rouxii was reduced in the presence of NaCl. Flow cytometry assay showed that under Cd stress, NaCl significantly reduced the production of reactive oxygen species(ROS) and cell death of Z. rouxii compared with those in the absence of NaCl. The activities of superoxide dismutase(SOD), catalase(CAT), and peroxidase(POD) of Z. rouxii were significantly enhanced by 2%–6% NaCl, which likely contributed to the high salt tolerance of Z. rouxii. The POD activity was inhibited by 20 mg L-1Cd while the SOD and CAT activities were enhanced by 8 mg L-1 Cd and inhibited by 20 mg L-1 or 50 mg L-1 Cd. The inhibitory effect of high-level Cd on the antioxidant enzyme activities of Z. rouxii was counteracted by the combined use of NaCl, especially at 6%. This probably accounted for the decrease in Cd-induced ROS production and cell death of Z. rouxii after incubation with NaCl and Cd. Our work provided physiological clues as to the use of Z. rouxii as a biosorbent for Cd removal from seawater and liquid highly salty food.
文摘Objective: To study the reproductive toxicity of cadmium chloride in male mice. Methods: Male mice of 4 weeks old were administered cadium chloride at doses of 0.5, 2 or 8 mg·kg-1·day-1 i.p. for 10 days. At day 50, the males were mated with virgin females at 1: 2. The pregnancy rate, the litter size and the body weight of the offspring were recorded; at the same time the development of the testis, the testicular index, the germ cell miosis and the epididymal sperm count, motility and malformed sperm were observed in the intoxicated males. Results: The testicular index was lower in the 2 and 8 mg/kg groups than in the controls and 0.5 mg/kg groups (P< 0.05). In the 2 and 8 mg/kg groups, there were testicular maldeve-lopment, epididymal azoospermia and infertility. The pregnancy rate was lower in the 2 mg/kg group than in the control and 0.5 mg/ kg group (P<0.05). The ectopic pregnancy rate of the cadmium chloride group was not significantly different from that of the controls. The sperm count, motility and malformed sperm were not significantly different between the 0.5 mg/kg group and the controls. Conclusion: Cadmium chloride, at doses of 2 mg/kg or more, reduces the pregnancy rate, which may be related to testis maldevelopment and epididymal azoospermia. Androl
文摘目的:研究镉暴露对雄性小鼠精子生成的影响及其分子机制。方法:分别以1、5、10 μ mol/kg浓度氯化镉腹腔连续暴露小鼠,每天1次,连续5d,测定睾丸指数和精子相对计数;同时应用单细胞凝胶电泳(single-cell gel electrophoresis,SCGE)技术检测睾丸生精细胞DNA损伤率和迁移长度。结果:三种剂量氯化镉处理组睾丸指数显著低于对照组(P<0.001),睾丸精子相对计数也显著低于对照组(P<0.05、P<0.001),生精细胞DNA损伤率和慧星细胞迁移长度显著高于对照组(P<0.001),且随剂量增加DNA损伤率和慧星细胞迁移长度也显著增加。结论:DNA链断裂可能是镉引起生精障碍的机制之一。
