目的探讨瘦素调控大鼠肝纤维化的信号转导机制及槲寄生碱的干预作用。方法以CCl4诱导的肝纤维化大鼠模型为研究对象,45只大鼠随机分为三组,分别为对照组、模型组、药物干预组。对照组不做任何处理,自由饮食、饮水;模型组和槲寄生碱治疗...目的探讨瘦素调控大鼠肝纤维化的信号转导机制及槲寄生碱的干预作用。方法以CCl4诱导的肝纤维化大鼠模型为研究对象,45只大鼠随机分为三组,分别为对照组、模型组、药物干预组。对照组不做任何处理,自由饮食、饮水;模型组和槲寄生碱治疗组分别腹腔注射40%CCl4-植物油溶液2 m L/kg,每周2次,共8周。实验第9周,治疗组经灌胃给予大鼠槲寄生碱8g/(kg·d),模型组灌胃给予等剂量的生理盐水,共8周。实验第17周颈椎脱臼法处死所有动物,取出肝脏左前叶。采用HE染色、MASSON染色方法观察槲寄生碱对肝纤维化大鼠肝组织形态学的影响;免疫组织化学的方法观察槲寄生碱对大鼠肝星状细胞瘦素及瘦素受体的影响。Western Blot法检测大鼠肝脏组织JAK2、STAT3蛋白水平以及JAK2、STAT3蛋白磷酸化水平。结果肝脏大体、HE染色以及Masson胶原染色结果提示:大鼠肝纤维化模型复制成功,槲寄生碱具有阻断逆转肝纤维化的作用。免疫组织化学染色显示,与模型组比较,槲寄生碱明显抑制模型大鼠肝组织瘦素、瘦素受体的表达。Western Blot显示,正常对照组JAK2、STAT3蛋白表达量最少;模型组JAK2、STAT3蛋白高表达;而药物处理组的JAK2、STAT3蛋白表达明显下调。结论槲寄生碱可有效逆转大鼠肝脏纤维化,其作用机制可能是通过下调大鼠肝组织瘦素、瘦素受体的表达,进而影响JAK2/STAT3信号通路来完成的。展开更多
Cytochrome P450 monoxygenase converts arachionic acid to four epoxyeicosatrienoic acid regiosomes: 5,6-EET(epoxyeicosatrienoic acid);8,9-EET; 11,12-EET and 14,15-EET.Recent studies show that EETs are involved in signa...Cytochrome P450 monoxygenase converts arachionic acid to four epoxyeicosatrienoic acid regiosomes: 5,6-EET(epoxyeicosatrienoic acid);8,9-EET; 11,12-EET and 14,15-EET.Recent studies show that EETs are involved in signal transduction. EETs open Ca 2+ -sensitive K + channel and inhibit Na + channel,Ca 2+ -sensitive Cl - channel and so on. What is more ,EETs have been demonstrated to activate PP60 c-src and initiate a tyrosine kinase cascade that mediates mitogenic effects.展开更多
A Review The endothelium derived hyperpolarizing factor (EDHF) has been paied attention to since the late 1980s. But it is not clear which are EDHF. The article reviewed the EDHF works and epoxyeicosatrienoic acids (E...A Review The endothelium derived hyperpolarizing factor (EDHF) has been paied attention to since the late 1980s. But it is not clear which are EDHF. The article reviewed the EDHF works and epoxyeicosatrienoic acids (EETs),an important kind of EDHF.展开更多
文摘目的探讨瘦素调控大鼠肝纤维化的信号转导机制及槲寄生碱的干预作用。方法以CCl4诱导的肝纤维化大鼠模型为研究对象,45只大鼠随机分为三组,分别为对照组、模型组、药物干预组。对照组不做任何处理,自由饮食、饮水;模型组和槲寄生碱治疗组分别腹腔注射40%CCl4-植物油溶液2 m L/kg,每周2次,共8周。实验第9周,治疗组经灌胃给予大鼠槲寄生碱8g/(kg·d),模型组灌胃给予等剂量的生理盐水,共8周。实验第17周颈椎脱臼法处死所有动物,取出肝脏左前叶。采用HE染色、MASSON染色方法观察槲寄生碱对肝纤维化大鼠肝组织形态学的影响;免疫组织化学的方法观察槲寄生碱对大鼠肝星状细胞瘦素及瘦素受体的影响。Western Blot法检测大鼠肝脏组织JAK2、STAT3蛋白水平以及JAK2、STAT3蛋白磷酸化水平。结果肝脏大体、HE染色以及Masson胶原染色结果提示:大鼠肝纤维化模型复制成功,槲寄生碱具有阻断逆转肝纤维化的作用。免疫组织化学染色显示,与模型组比较,槲寄生碱明显抑制模型大鼠肝组织瘦素、瘦素受体的表达。Western Blot显示,正常对照组JAK2、STAT3蛋白表达量最少;模型组JAK2、STAT3蛋白高表达;而药物处理组的JAK2、STAT3蛋白表达明显下调。结论槲寄生碱可有效逆转大鼠肝脏纤维化,其作用机制可能是通过下调大鼠肝组织瘦素、瘦素受体的表达,进而影响JAK2/STAT3信号通路来完成的。
文摘Cytochrome P450 monoxygenase converts arachionic acid to four epoxyeicosatrienoic acid regiosomes: 5,6-EET(epoxyeicosatrienoic acid);8,9-EET; 11,12-EET and 14,15-EET.Recent studies show that EETs are involved in signal transduction. EETs open Ca 2+ -sensitive K + channel and inhibit Na + channel,Ca 2+ -sensitive Cl - channel and so on. What is more ,EETs have been demonstrated to activate PP60 c-src and initiate a tyrosine kinase cascade that mediates mitogenic effects.
文摘A Review The endothelium derived hyperpolarizing factor (EDHF) has been paied attention to since the late 1980s. But it is not clear which are EDHF. The article reviewed the EDHF works and epoxyeicosatrienoic acids (EETs),an important kind of EDHF.
