针刺干预胰岛素抵抗模型大鼠胰岛素信号转导途径中GLUT4和Akt2 mRNA表达的研究
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摘要
胰岛素抵抗(IR)可引起的一系列病理生理变化,是包括脑卒中在内的多种疾病的重要危险因素。针刺对脑卒中、糖尿病、肥胖等IR相关疾病的疗效早已得到了国内外同行的公认。
     目的:通过动物实验阐明针刺对胰岛素抵抗的干预作用。以反映IR水平的血液生化学指标以及糖代谢胰岛素信号转导途径中的关键蛋白GLUT4(葡萄糖转运蛋4)和Akt2(蛋白激酶B_β)为对象,运用头穴丛刺、背俞穴针刺等不同针刺方法进行干预。探讨IR模型大鼠胰岛素信号转导途径中GLUT4和Akt2 mRNA表达的变化特点和针刺干预作用——防治脑卒中及其他IR相关疾病的机制。
     方法:将健康Wistar雄性大鼠随机分为正常对照组、模型组、头针组、和背俞穴针刺组,每组8只。采用高脂膳食喂养建立IR大鼠模型,头针组采用头穴丛刺法,背俞穴针刺组取脾俞、肾俞加胰俞穴电针治疗,连续治疗两周;采用放射免疫分析方法测定血浆胰岛素(FINS),全自动生化分析仪检测大鼠空腹血糖(FBG)、胆固醇(TC)、甘油三酯(TG),测算胰岛素敏感性指数(ISI)及体重(BW)等相关指标,明确IR模型建立成功及针刺的疗效;采用免疫组化观察各组大鼠骨骼肌细胞GLUT4和Akt2的表达;应用逆转录聚合酶链反应(RT-PCR)技术对相关分子m RNA表达进行观测和定量分析研究。
     结果:1.模型组BW、FINS、TG均较正常组明显升高,而ISI却明显下降(P<0.05);各针刺组大鼠FINS较模型组明显降低,ISI则明显上升(p<0.05),不同针刺组之间无显著性差异(P>0.05);模型组较正常组FBG、TC升高无统计学意义(P>0.05);各针刺组较模型组BW、TG降低无统计学意义(P>0.05)。2.免疫组化的结果显示IR模型大鼠骨骼肌GLUT4、Akt2的表达较正常组明显减弱,通过针刺干预可以使GLUT4、Akt2的表达增强,但是背俞穴组和头针组之间的差别不大。3.RT-PCR结果显示:模型组GLUT4 mRNA含量均较正常组明显降低(p<0.05),针刺组GLUT4 mRNA含量明显高于模型组(p<0.05),不同针刺组之间无显著性差异(P>0.05);模型组骨骼肌Akt2 mRNA表达较正常对照组大鼠明显降低(p<0.01);而两组针刺组较模型组明显升高(p<0.01),不同针刺组之间无显著性差异(P>0.05)。
     结论:1.针刺显著提高IR模型大鼠胰岛素敏感性指数,使之趋向正常,改善了胰岛素抵抗状况,从而达到防治脑卒中及其他IR相关疾病的目的。头针组和背俞穴针刺组之间疗效差别无统计学意义。2.针刺可使IR模型大鼠GLUT4基因转录增加,导致GLUT4蛋白含量增加,其结果是外周组织细胞转运和利用葡萄糖的能力增加,这是针刺改善IR状况的机制之一。3.针刺可以使IR大鼠胰岛素信号转导途径中Akt2表达增强和mRNA含量增加,促进了胰岛素PI3-K/Akt途径信号通路中GLUT4的转位,针刺可能通过胰岛素受体后机制中的主要途径之一—PI3-K/Akt信号转导通路改善IR大鼠外周组织对胰岛素的抵抗,降低高胰岛素血症,也是针刺改善IR状况的机制之一。
Implication of insulin rasistance(IR) leads to a series of changes on pathology physiology,which are significant risk factors to many disease included in stroke. And curative effects of acupuncture on stroke ,diabetes adipositas and so on which connected with IR have been generally accepted.
     Objective:To develop a rat model of IR,and to study the effect of acupuncture on expression of GLUT4 (glucose transporter 4) and Akt2 (protein kinase Bp) in somatic muscles of IR rats and the mechanism of acupuncture therapy in IR,which can prevent and cure stroke and other disease correlated with IR.
     Method: 1 .Male Wistar rats were were randomly divded into 4 groups: The IR model rats without treatment group(M group), the IR rats with head acupuncture treatment group(HA group), the IR rats with back Shu-acupoint acupuncture treatment group(SA group) and the normal controls group(N group) and each group has 8 rats. The rats of M,HA and SA groups were given the high fat diets for 4 weeks to be IR model rats. Then the HA group were treated with cluster acupuncture on scalp points and the SA group were treated with Pishu Shenshu and Yishu acupoints electroacupuncture for 2 weeks.2.The blood samples were collected to evaluate FINS,FBG,TC and TG, to calculate ISI ( insulin sensitivity index) and measure BW to identify the IR of model rats and observe the curative effect of acupuncture. 3 . The protein expression of GLUT4 and Akt2 in rats skeletal muscle were observed by immunohistochemistry. 4.The GLUT4 and Akt2 mRNA of skeletal muscle was determined with RT-PCR(reverse transcription-polymerase chain raction).
     Results: 1. Compared with N group,the BW,FINS and TG in M group were significantly increased, and ISI was decreased(P<0.05).Compared with M group,the BW,FINS in HA group and SA group was significantly decreased, and ISI was increased (P<0.05), withnot statistical significance between HA group and SA group (P>0.05).There was no statistical significance of the increase of FBG and TC in M group compared with N group, as well as the decrease of BW and TG in HA group and SA group compared with M group(P>0.05).2. The result of immunohistochemistry was shown the protein expression of GLUT4 and Akt2 in M group rats skeletal muscle was weaker than that in N group. And there was stronger expression in HA group and SA group than that in M group without significant defference between acupuncture groups.3. The result of RT-PCR was shown the expression of GLUT4 mRNA in M group rats skeletal muscle was significantly decreased,compared with N group (P<0.05) .And compared with M group, it was increased in HA group and SA group(P<0.05) without significant defference between them(P>0.05).The expression of Akt2 mRNA in M group rats skeletal muscle was significantly decreased,compared with N group (P<0.01) .And compared with M group, it was increased in HA group and SA group(P<0.01) without significant defference between them(P>0.05).
     Conclusions: 1 .IR can be ameliorated by acupuncture without significant defference between HA group and SA group,which can prevent and cure stroke and other disease correlated with IR. 2. The genetic transcription of GLUT4 and the ability of conveying and utilizing glycose in IR rats skeletal muscle cells can be enhanced by acupuncture, which is one of the amelioration mechanisms of acupuncture.3. Acupuncture may enhance the Akt2 expression and raise the amount of Akt2 mRNA in IR rats , which enhances the transposition of GLUT4 in the PI3-K/Akt signaling pathway, contributing to the main mechanismof improved post-receptor IR and decreased hyperinsulinemia in IR rats,which also is one of the amelioration mechanisms of acupuncture.
引文
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