目的研究大鼠血管平滑肌细胞(VSMCs)增殖、凋亡与信号传导子和激活子3(STAT3)信号传导通路的关系,明确以JAK2/STAT3为靶向的信号传导在VSMCs中的分子调控机制。方法将酪氨酸激酶(JAK2)抑制剂AG490,作用于大鼠VSMCs,运用MTT法检测细胞增...目的研究大鼠血管平滑肌细胞(VSMCs)增殖、凋亡与信号传导子和激活子3(STAT3)信号传导通路的关系,明确以JAK2/STAT3为靶向的信号传导在VSMCs中的分子调控机制。方法将酪氨酸激酶(JAK2)抑制剂AG490,作用于大鼠VSMCs,运用MTT法检测细胞增殖;流式细胞仪检测VSMCs凋亡;W estern b lot检测JAK2、STAT3、cyc lin D1、BCL-2的表达及相关蛋白磷酸化活性。结果AG490呈时间、剂量依赖性方式抑制VSMCs增殖,促进其凋亡。P-JAK2、P-STAT3、cyc lin D1、BCL-2表达水平随作用时间延长而下降(P<0.01)。结论癌基因STAT3信号传导通路调控了AG490对VSMCs作用的细胞内信号传导机制,最终通过其下游靶基因cyc lin D1、BCL-2影响VSMCs的增殖与凋亡。展开更多
Puerarin, a major isoflavonoid derived from the Chinese medical herb radix puerariae （Gegen）, has been reported to inhibit neuronal apoptosis and play an anti-inflammatory role in focal cerebral ischemia model rats....Puerarin, a major isoflavonoid derived from the Chinese medical herb radix puerariae （Gegen）, has been reported to inhibit neuronal apoptosis and play an anti-inflammatory role in focal cerebral ischemia model rats. Recent findings regarding stroke pathophysiology have recognized that anti-inflammation is an important target for the treatment of ischemic stroke. The cholinergic anti-inflammatory pathway is a highly robust neural-immune mechanism for inflammation control. This study was to investigate whether activating the cholinergic anti-inflammatory pathway can be involved in the mechanism of inhibiting the inflammatory response during puerarin-induced cerebral ischemia/reperfusion in rats. Results showed that puerarin pretreatment （intravenous injection） re- duced the ischemic infarct volume, improved neurological deficit after cerebral ischemia/reperfusion and decreased the levels of interleukin-1β, interleukin-6 and tumor necrosis factor-a in brain tissue. Pretreatment with puerarin （intravenous injection） attenuated the inflammatory response in rats, which was accompanied by janus-activated kinase 2 （JAK2） and signal transducers and activators of transcription 3 （STAT3） activation and nuclear factor kappa B （NF-KB） inhibition. These observa- tions were inhibited by the alpha7 nicotinic acetylcholine receptor （a7nAchR） antagonist a-bungarotoxin （a-BGT）. In addition, puerarin pretreatment increased the expression of a7nAchR mRNA in ischemic cerebral tissue. These data demonstrate that puerarin pretreatment strongly protects the brain against cerebral ischemia/reperfusion injury and inhibits the inflammatory re- sponse. Our results also indicated that the anti-inflammatory effect of puerarin may partly be medi- ated through the activation of the cholinergic anti-inflammatory pathway.展开更多
信号转导及转录激活因子3(signal transducers and activators of transcription 3,STAT3)是一种细胞内重要的转录因子,在体内可被其最常见的上游激酶JAK激酶(Janus kinase)磷酸化激活。众所周知,异常激活的STAT3促进肿瘤的发生发展,因...信号转导及转录激活因子3(signal transducers and activators of transcription 3,STAT3)是一种细胞内重要的转录因子,在体内可被其最常见的上游激酶JAK激酶(Janus kinase)磷酸化激活。众所周知,异常激活的STAT3促进肿瘤的发生发展,因此研究人员一直致力于研究一类靶向JAK/STAT3信号通路的抗肿瘤药物。笔者收集了近年来文献中报道的靶向JAK/STAT3信号通路的抑制剂研究及临床试验进展,对于部分抑制剂已经报道的靶点、作用机制和药效活性进行总结。展开更多
文摘目的研究大鼠血管平滑肌细胞(VSMCs)增殖、凋亡与信号传导子和激活子3(STAT3)信号传导通路的关系,明确以JAK2/STAT3为靶向的信号传导在VSMCs中的分子调控机制。方法将酪氨酸激酶(JAK2)抑制剂AG490,作用于大鼠VSMCs,运用MTT法检测细胞增殖;流式细胞仪检测VSMCs凋亡;W estern b lot检测JAK2、STAT3、cyc lin D1、BCL-2的表达及相关蛋白磷酸化活性。结果AG490呈时间、剂量依赖性方式抑制VSMCs增殖,促进其凋亡。P-JAK2、P-STAT3、cyc lin D1、BCL-2表达水平随作用时间延长而下降(P<0.01)。结论癌基因STAT3信号传导通路调控了AG490对VSMCs作用的细胞内信号传导机制,最终通过其下游靶基因cyc lin D1、BCL-2影响VSMCs的增殖与凋亡。
基金supported by the Young Scientists Foundation of Hubei Provincial Health Department,No.QJX2012-16
文摘Puerarin, a major isoflavonoid derived from the Chinese medical herb radix puerariae （Gegen）, has been reported to inhibit neuronal apoptosis and play an anti-inflammatory role in focal cerebral ischemia model rats. Recent findings regarding stroke pathophysiology have recognized that anti-inflammation is an important target for the treatment of ischemic stroke. The cholinergic anti-inflammatory pathway is a highly robust neural-immune mechanism for inflammation control. This study was to investigate whether activating the cholinergic anti-inflammatory pathway can be involved in the mechanism of inhibiting the inflammatory response during puerarin-induced cerebral ischemia/reperfusion in rats. Results showed that puerarin pretreatment （intravenous injection） re- duced the ischemic infarct volume, improved neurological deficit after cerebral ischemia/reperfusion and decreased the levels of interleukin-1β, interleukin-6 and tumor necrosis factor-a in brain tissue. Pretreatment with puerarin （intravenous injection） attenuated the inflammatory response in rats, which was accompanied by janus-activated kinase 2 （JAK2） and signal transducers and activators of transcription 3 （STAT3） activation and nuclear factor kappa B （NF-KB） inhibition. These observa- tions were inhibited by the alpha7 nicotinic acetylcholine receptor （a7nAchR） antagonist a-bungarotoxin （a-BGT）. In addition, puerarin pretreatment increased the expression of a7nAchR mRNA in ischemic cerebral tissue. These data demonstrate that puerarin pretreatment strongly protects the brain against cerebral ischemia/reperfusion injury and inhibits the inflammatory re- sponse. Our results also indicated that the anti-inflammatory effect of puerarin may partly be medi- ated through the activation of the cholinergic anti-inflammatory pathway.
文摘信号转导及转录激活因子3(signal transducers and activators of transcription 3,STAT3)是一种细胞内重要的转录因子,在体内可被其最常见的上游激酶JAK激酶(Janus kinase)磷酸化激活。众所周知,异常激活的STAT3促进肿瘤的发生发展,因此研究人员一直致力于研究一类靶向JAK/STAT3信号通路的抗肿瘤药物。笔者收集了近年来文献中报道的靶向JAK/STAT3信号通路的抑制剂研究及临床试验进展,对于部分抑制剂已经报道的靶点、作用机制和药效活性进行总结。
