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Mesenchymal stem cell transplantation is a novel means of treating cerebral ischemia/reper-fusion, and can promote angiogenesis and neurological functional recovery. Acupuncture at Conception and Governor vessels also has positive effects as a treatment for cerebral ischemia/reperfusion. Therefore, we hypothesized that electro-acupuncture at Conception and Governor vessels plus mesenchymal stem cell transplantation may have better therapeutic effects on the promotion of angiogenesis and recovery of neurological function than either treatment alone. In the present study, human umbilical cord blood-derived mesenchymal stem cells were isolated, cultured, identified and intracranially transplanted into the striatum and subcortex of rats at 24 hours following cerebral ischemia/reperfusion. Subsequently, rats were electro-acupunctured at Conception and Governor vessels at 24 hours after transplantation. Modified neurological severity scores and immunohistochemistry ifndings revealed that the combined interventions of electro-acupuncture and mesenchymal stem cell transplantation clearly improved neurological impairment and up-regulated vascular endothelial growth factor expression around the isch-emic focus. The combined intervention provided a better outcome than mesenchymal stem cell transplantation alone. These ifndings demonstrate that electro-acupuncture at Conception and Governor vessels and mesenchymal stem cell transplantation have synergetic effects on promot-ing neurological function recovery and angiogenesis in rats after cerebral ischemia/reperfusion.
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高糖及血管紧张素Ⅱ对大鼠肾小球系膜细胞结缔组织
糖尿病肾病(DN)是糖尿病常见而且严重的慢性并发症,高血糖和血管紧张素Ⅱ(AngⅡ)是导致DN肾纤维化主要的两种物质,它们通过共同的信号传导途径参与了肾纤维化的发生发展[1,2].近年来,国外研究发现结缔组织生长因子(connective tissue growth factor,CTGF)对肾细胞增殖、表型改变及细胞外基质(ECM)具有较强调控作用,其异常表达在DN肾纤维化进程中起了重要作用.本研究拟用高糖和AngⅡ刺激体外培养的系膜细胞,测定其CTGF mRNA的表达情况,以探讨高糖和AngⅡ对系膜细胞CTGF水平变化的影响.
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氯沙坦通过ERK1/2丝裂原活化蛋白激酶途径抑制高糖诱导的小鼠系膜细胞结缔组织生长因子表达
糖尿病肾病(DN)是糖尿病严重的慢性并发症之一,其主要病理特征是由细胞外基质(ECM)增多引起的肾小球硬化.血管紧张素(Ang)受体拮抗剂氯沙坦可有效地延缓肾小球硬化,被用于DN的治疗.高糖可诱导肾脏系膜细胞结缔组织生长因子(CTGF)的表达,从而促进ECM积聚和组织器官的纤维化.丝裂原活化蛋门激酶(MAPK)作为真核细胞胞质内的信号转导终末通路,与DN的发病密切相关[1].本研究观察高糖是否通过ERK1/2 MAPK途径调节小鼠系膜细胞CTGF的表达,以及氯沙坦对CTGF的作用是否也与ERK1/2 MAPK通路相关.
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小分子干扰RNA对长期高糖培养的人肾小管上皮细胞结缔组织生长因子表达的抑制作用
大量证据表明,糖尿病肾病(DN)时肾小管间质病变的严重程度与蛋白尿排泄量和肾功能的进行性下降密切相关,提示肾小管上皮细胞(TEC)损伤在DN进程中占有重要地位.