AIM To investigate the pathogenic effect ofSEB and D-GalN on liver and the protection ofcyclosporin A, the relationship between hepaticapoptosis and necrosis and the possiblemechanism of acute hepatic necrosis.METHODS...AIM To investigate the pathogenic effect ofSEB and D-GalN on liver and the protection ofcyclosporin A, the relationship between hepaticapoptosis and necrosis and the possiblemechanism of acute hepatic necrosis.METHODS After staphylococcal enterotoxin B(SEB ) mixed with D--galactosamine (D-GaiN )were injected intraperitoneally into Balb/c miceand those previously treated with cyclosporin A,blood samples were collected and livers wereisolated at 2, 6, 12 and 24 h. Patterns othepatocellular death were studiedmorphologically and biochemically, circulatingcytokines (TNF-a, IFN--y ) and mice mortalitywithin 24h was assessed.RESU’LTS The SEB could induce the typicalapoptotic changes of hepatocytes, the D-GaiNcould induce hepatocytes apoptosis anddegeneration at the same time, and the micehaving received the SEB + D-GaiN injectionsdeveloped apoptosis at 2 and 6 h, but after 12 hhepatocytes were characterized by severein jury, whereas all the examinations in thecyclosporin A treated mice were normal.CONCLUSION Hepatic cell apoptosis might berelated to necrosis, and massive hepatocyteapoptosis is likely the initiating step of acutehepatic necrosis in mice. The effects induced bySEB and D--GaiN on hepatocytes might bemediated by T cells, and could be prevented bycyclosporin A.展开更多
目的探讨超抗原金黄色葡萄球菌肠毒素B(SEB)对人永生化角质形成细胞(Ha Ca T细胞)糖皮质激素受体表达及核转移的影响。方法采用不同浓度SEB作用于体外培养的Ha Ca T细胞,RT-PCR、Western blot分别检测Ha Ca T细胞糖皮质激素受体α、β(G...目的探讨超抗原金黄色葡萄球菌肠毒素B(SEB)对人永生化角质形成细胞(Ha Ca T细胞)糖皮质激素受体表达及核转移的影响。方法采用不同浓度SEB作用于体外培养的Ha Ca T细胞,RT-PCR、Western blot分别检测Ha Ca T细胞糖皮质激素受体α、β(GRα、GRβ)m RNA、蛋白的表达;随后用SEB预处理Ha Ca T细胞,地塞米松再作用Ha Ca T细胞8 h后,免疫荧光法检测Ha Ca T细胞GRα细胞内分布情况。结果 SEB作用Ha Ca T细胞后,其GRαm RNA、蛋白表达无明显变化,GRβm RNA、蛋白表达随SEB的浓度增高呈上升趋势,且在SEB质量浓度为100 ng/ml时达到最高值。10-6mol/L地塞米松作用8 h后能够诱导Ha Ca T细胞GRα由胞浆向胞核转移,该效应能够维持到24 h。与地塞米松组Ha Ca T细胞内GRα分布出现向核内转移现象不同,地塞米松+SEB组部分细胞GRα分布仍局限于胞质,并未出现核转移现象。结论 SEB可能通过诱导角质形成细胞GRβ表达上调及抑制地塞米松诱导的GRα由胞浆向胞核转移参与炎症性皮肤病外用糖皮质激素抵抗。展开更多
文摘AIM To investigate the pathogenic effect ofSEB and D-GalN on liver and the protection ofcyclosporin A, the relationship between hepaticapoptosis and necrosis and the possiblemechanism of acute hepatic necrosis.METHODS After staphylococcal enterotoxin B(SEB ) mixed with D--galactosamine (D-GaiN )were injected intraperitoneally into Balb/c miceand those previously treated with cyclosporin A,blood samples were collected and livers wereisolated at 2, 6, 12 and 24 h. Patterns othepatocellular death were studiedmorphologically and biochemically, circulatingcytokines (TNF-a, IFN--y ) and mice mortalitywithin 24h was assessed.RESU’LTS The SEB could induce the typicalapoptotic changes of hepatocytes, the D-GaiNcould induce hepatocytes apoptosis anddegeneration at the same time, and the micehaving received the SEB + D-GaiN injectionsdeveloped apoptosis at 2 and 6 h, but after 12 hhepatocytes were characterized by severein jury, whereas all the examinations in thecyclosporin A treated mice were normal.CONCLUSION Hepatic cell apoptosis might berelated to necrosis, and massive hepatocyteapoptosis is likely the initiating step of acutehepatic necrosis in mice. The effects induced bySEB and D--GaiN on hepatocytes might bemediated by T cells, and could be prevented bycyclosporin A.
文摘目的探讨超抗原金黄色葡萄球菌肠毒素B(SEB)对人永生化角质形成细胞(Ha Ca T细胞)糖皮质激素受体表达及核转移的影响。方法采用不同浓度SEB作用于体外培养的Ha Ca T细胞,RT-PCR、Western blot分别检测Ha Ca T细胞糖皮质激素受体α、β(GRα、GRβ)m RNA、蛋白的表达;随后用SEB预处理Ha Ca T细胞,地塞米松再作用Ha Ca T细胞8 h后,免疫荧光法检测Ha Ca T细胞GRα细胞内分布情况。结果 SEB作用Ha Ca T细胞后,其GRαm RNA、蛋白表达无明显变化,GRβm RNA、蛋白表达随SEB的浓度增高呈上升趋势,且在SEB质量浓度为100 ng/ml时达到最高值。10-6mol/L地塞米松作用8 h后能够诱导Ha Ca T细胞GRα由胞浆向胞核转移,该效应能够维持到24 h。与地塞米松组Ha Ca T细胞内GRα分布出现向核内转移现象不同,地塞米松+SEB组部分细胞GRα分布仍局限于胞质,并未出现核转移现象。结论 SEB可能通过诱导角质形成细胞GRβ表达上调及抑制地塞米松诱导的GRα由胞浆向胞核转移参与炎症性皮肤病外用糖皮质激素抵抗。
