替米沙坦对脂多糖刺激脂肪细胞分泌细胞因子和相关炎症通路的影响
发布时间:2018-10-21 19:21
【摘要】:研究背景高血压、糖尿病、脂质代谢紊乱和肥胖常常簇集出现而形成代谢综合征,严重影响公众的健康水平,微炎症反应在其中发挥了重要的作用。肾素-血管紧张素(RAS)系统除了血流动力学作用外,还促进微炎症反应。阻断RAS系统,对上述疾病具有一定的保护作用。RAS系统组分也存在于脂肪组织和脂肪细胞中,因此脂肪组织和脂肪细胞可能成为血管紧张素受体拮抗剂(ARBs)的作用靶点。 目的研究血管紧张素Ⅱ受体拮抗剂替米沙坦对脂多糖(LPS)刺激脂肪细胞分泌白细胞介素6(IL-6)、肿瘤坏死因子а(TNF-а)、脂联素及三者mRNA表达的影响,并深入探讨替米沙坦对脂肪细胞NF-κB通路和MAPK通路相关蛋白NF-κBp65、p-IκBα、IκBα、p-ERK1/2、ERK1/2、p-p38MAPK、p38MAPK、p-JNK和JNK表达的影响。 方法将培养成熟的脂肪细胞随机分为6组:对照组,LPS(1μg/ml)组,LPS+替米沙坦0.01μg/ml,0.1μg/ml,1μg/ml和10μg/ml组。对照组加DMSO,LPS+替米沙坦组加入不同浓度替米沙坦,孵育2h后,LPS组和LPS+替米沙坦组再加入脂多糖(1μg/ml)孵育1h。细胞经上述处理后,提取细胞上清和细胞总RNA,用酶联免疫吸附法(ELISA)和实时定量聚合酶联反应(Q-PCR)分别检测各组TNF-а、IL-6和脂联素的蛋白分泌水平及mRNA基因表达的差异。收集细胞,提取核蛋白和总蛋白,用Western免疫印迹法检测各组核蛋白NF-κBp65、总蛋白p-IκBα、IκBα、p-ERK1/2、ERK1/2、p-p38MAPK、p38MAPK、p-JNK和JNK的表达,比较各组NF-κBp65核转位以及其它蛋白磷酸化水平的差异。 结果与对照组相比,脂多糖刺激可使IL-6分泌升高2.7倍,mRNA表达升高4倍,替米沙坦干预后IL-6分泌及其mRNA表达均随替米沙坦浓度升高呈下降趋势,其中最大剂量替米沙坦(10μg/ml)干预后,IL-6分泌水平和mRNA表达分别下降约63%和67%。TNF-а分泌及其mRNA表达也随替米沙坦浓度升高呈下降,与对照组相比,脂多糖刺激使TNF-а分泌升高约1.3倍,mRNA表达升高约3.5倍,最大剂量替米沙坦(10μg/ml)干预后,TNF-а分泌水平下降23%,mRNA表达下降86%。较之对照组,大剂量替米沙坦可使脂联素的分泌及mRNA表达升高,而脂多糖对脂肪细胞脂联素的分泌和mRNA表达没有影响。脂多糖刺激后脂肪细胞胞浆内IκBα磷酸化蛋白表达增强,NF-κBp65蛋白核转位增加,胞核内NF-κBp65蛋白表达增多,MAPK通路相关蛋白ERK1/2磷酸化和p38MAPK磷酸化水平也增强,而JNK蛋白磷酸化未检测到。10μg/ml替米沙坦干预后,,NF-κBp65蛋白核转位受抑制,核蛋白NF-κBp65表达减少,IκBα磷酸化表达也减少,MAPK通路蛋白ERK1/2磷酸化表达和p38MAPK磷酸化表达均减少。 结论替米沙坦能通过直接影响脂肪细胞炎性因子的分泌而发挥抗炎作用,其抗炎机制包括NF-κB通路中IκBα磷酸化和NF-κBp65核转位以及MAPK通路中ERK1/2和p38MAPK的磷酸化。
[Abstract]:Background Hypertension, diabetes mellitus, lipid metabolism disorder and obesity are often clustered to form metabolic syndrome, which seriously affects the health of the public, in which micro-inflammation plays an important role. The renin-angiotensin (RAS) system promotes microinflammation in addition to hemodynamics. Blocking the RAS system has some protective effect on the above diseases. The components of RAS system also exist in adipose tissue and adipocyte, so adipose tissue and adipocytes may be the target of angiotensin receptor antagonist (ARBs). Objective to study the effects of telmisartan, an angiotensin 鈪
本文编号:2286108
[Abstract]:Background Hypertension, diabetes mellitus, lipid metabolism disorder and obesity are often clustered to form metabolic syndrome, which seriously affects the health of the public, in which micro-inflammation plays an important role. The renin-angiotensin (RAS) system promotes microinflammation in addition to hemodynamics. Blocking the RAS system has some protective effect on the above diseases. The components of RAS system also exist in adipose tissue and adipocyte, so adipose tissue and adipocytes may be the target of angiotensin receptor antagonist (ARBs). Objective to study the effects of telmisartan, an angiotensin 鈪
本文编号:2286108
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