Objective: To confirm whetherBungarus multicinctus crude venom induces the apoptosis of K562 tumor cells and to find out the components inducing apoptosis of K562 cells from the crude venom. Methods: the crude venom s...Objective: To confirm whetherBungarus multicinctus crude venom induces the apoptosis of K562 tumor cells and to find out the components inducing apoptosis of K562 cells from the crude venom. Methods: the crude venom separated and purified by cation exchange chromatography, and the effect of venoms on K562 was studied by MTT method and flow cytometry. Results: The crude venom began to kill K562 cells at than 8×l03ng/ml (the survival rate was 82.5%) concentration and the effect was more significant in 24 h when administrating 8×l05ng/ml (the survival rate was 29.4%) crude venom. Apoptotic bodies were observed in the K562 tumor cells by fluorescent microscopy after administration of 5 μg/ml cycloheximide (CHX) or the peak VI solution at about 8×105 ng/ml. The same results were detected by the flow cytometry. A sub-Gi peak appeared after administration of CHX or the sixth peak solution. Conclusion: The authors found that the venom can kill K562 tumor cells in time- and dose-dependent manner. However, the killing effect of the venom is not apoptosis. What’s more, the peak VI solution, a component of the crude venom can induce the apoptosis of K562 tumor cells.展开更多
Zearalenone (ZEN) is a non steroidal estrogenic mycotoxin produced by Fusarium species of fungi which contaminate human foods and animal feeds worldwide. In this study hepatotoxicity of ZEN was evaluated in mice by or...Zearalenone (ZEN) is a non steroidal estrogenic mycotoxin produced by Fusarium species of fungi which contaminate human foods and animal feeds worldwide. In this study hepatotoxicity of ZEN was evaluated in mice by oral adminis-tration of single and repeated doses of ZEN mycotoxin (2.7 mg/kg b.w.). The protective effect of crude venom extracted from jellyfish Cassiopea andromeda was also assessed. Mice were divided into four groups (N = 10). G1: receiving the toxin once and sacrificed 48 h later, G2: toxin administered twice for one week, G3: toxin administered twice a week for two weeks, G4: pretreated orally by a single dose of crude venom (1.78 mg/20g) 24 hours prior to administration of ZEN twice a week for two weeks. Each treated group had its corresponding control which received 1% DMSO sa-line.ZEN treatment significantly increased alanine aminotransferase (ALT), aspartateaminotrnsferase (AST) and alka-line phosphatase (ALP) activities after 48 hours and two weeks, while ALT was also significantly increased after one week. Tumor necrosis factoralpha (TNF-α) level was undetected in treated and control groups except the group treated with ZEN for one week. Alphafetoprotein (AFP) level was increased significantly only after two weeks. The activity of antioxidants was significantly increased in all groups. ZEN was also found to modify the serum proteins especially gamma-globulin which showed a significant decrease after 48 h and two weeks. Improvement in liver func-tion occurred in the group pretreated with the crude venom, and AFP and antioxidants returned to normal level, while TNF-α level was also undetected. Gamma globulin was significantly increased. The recovery observed in the group which was pretreated with crude venom may related to bradykinin content of this venom which exhibits a hepatoprotective effect. Histological changes in mouse liver coincided with biochemical changes. In conclusion, this study revealed that ZEN induced liver function and structural changes promising an approach for using a crude venom of jellyfish to enhance liver function.展开更多
基金This work was supported by the National Natural Science Foundation of China(No. 39570238)
文摘Objective: To confirm whetherBungarus multicinctus crude venom induces the apoptosis of K562 tumor cells and to find out the components inducing apoptosis of K562 cells from the crude venom. Methods: the crude venom separated and purified by cation exchange chromatography, and the effect of venoms on K562 was studied by MTT method and flow cytometry. Results: The crude venom began to kill K562 cells at than 8×l03ng/ml (the survival rate was 82.5%) concentration and the effect was more significant in 24 h when administrating 8×l05ng/ml (the survival rate was 29.4%) crude venom. Apoptotic bodies were observed in the K562 tumor cells by fluorescent microscopy after administration of 5 μg/ml cycloheximide (CHX) or the peak VI solution at about 8×105 ng/ml. The same results were detected by the flow cytometry. A sub-Gi peak appeared after administration of CHX or the sixth peak solution. Conclusion: The authors found that the venom can kill K562 tumor cells in time- and dose-dependent manner. However, the killing effect of the venom is not apoptosis. What’s more, the peak VI solution, a component of the crude venom can induce the apoptosis of K562 tumor cells.
文摘Zearalenone (ZEN) is a non steroidal estrogenic mycotoxin produced by Fusarium species of fungi which contaminate human foods and animal feeds worldwide. In this study hepatotoxicity of ZEN was evaluated in mice by oral adminis-tration of single and repeated doses of ZEN mycotoxin (2.7 mg/kg b.w.). The protective effect of crude venom extracted from jellyfish Cassiopea andromeda was also assessed. Mice were divided into four groups (N = 10). G1: receiving the toxin once and sacrificed 48 h later, G2: toxin administered twice for one week, G3: toxin administered twice a week for two weeks, G4: pretreated orally by a single dose of crude venom (1.78 mg/20g) 24 hours prior to administration of ZEN twice a week for two weeks. Each treated group had its corresponding control which received 1% DMSO sa-line.ZEN treatment significantly increased alanine aminotransferase (ALT), aspartateaminotrnsferase (AST) and alka-line phosphatase (ALP) activities after 48 hours and two weeks, while ALT was also significantly increased after one week. Tumor necrosis factoralpha (TNF-α) level was undetected in treated and control groups except the group treated with ZEN for one week. Alphafetoprotein (AFP) level was increased significantly only after two weeks. The activity of antioxidants was significantly increased in all groups. ZEN was also found to modify the serum proteins especially gamma-globulin which showed a significant decrease after 48 h and two weeks. Improvement in liver func-tion occurred in the group pretreated with the crude venom, and AFP and antioxidants returned to normal level, while TNF-α level was also undetected. Gamma globulin was significantly increased. The recovery observed in the group which was pretreated with crude venom may related to bradykinin content of this venom which exhibits a hepatoprotective effect. Histological changes in mouse liver coincided with biochemical changes. In conclusion, this study revealed that ZEN induced liver function and structural changes promising an approach for using a crude venom of jellyfish to enhance liver function.
