血管緊張素Ⅱ?qū)撬栝g充質(zhì)干細(xì)胞在缺血缺氧條件下Bcl-2和Bax表達(dá)的影響
發(fā)布時(shí)間:2018-10-14 17:29
【摘要】:研究背景:干細(xì)胞移植技術(shù)是近年來發(fā)展迅速的改善心功能的重要治療手段,其中研究最多的是骨髓間充質(zhì)干細(xì)胞(Bone Mesenchymal stemcells, BMSCs)。但是,它也面臨著一系列的挑戰(zhàn),其中最重要的是移植后干細(xì)胞在梗死區(qū)的生存問題,90%以上的BMSCs在移植后數(shù)天內(nèi)就會(huì)死亡。因此,如何提高移植后BMSCs的存活率,是提高缺血性心臟病干細(xì)胞治療的關(guān)鍵,也是目前干細(xì)胞移植治療亟待解決的問題。血管緊張素Ⅱ(AngiotensinⅡ, AngⅡ)是腎素-血管緊張素-醛固酮系統(tǒng)(reninangiotensin aldosterone system, RAAS)中重要的生物活性物質(zhì),在心血管疾病的發(fā)生發(fā)展中發(fā)揮重要作用,心肌梗死后機(jī)體可產(chǎn)生大量的AngⅡ,AngⅡ?qū)σ浦埠驜MSCs存活的影響如何有待于進(jìn)一步闡明。 目的:通過該研究探討血管緊張素Ⅱ預(yù)處理對(duì)缺血缺氧條件下BMSCs的Bcl-2和Bax的表達(dá)的影響,從而尋求減少BMSCs在缺血缺氧環(huán)境中凋亡的更好機(jī)制。 方法:以缺氧無血清條件模擬心肌梗死后的缺血缺氧微環(huán)境。提取SD大鼠的BMSCs進(jìn)行傳原代培養(yǎng),傳代后取生長(zhǎng)狀態(tài)良好的BMSCs進(jìn)行缺血缺氧處理,細(xì)胞活力采用CCK-8試劑盒測(cè)定,,再分別加入不同濃度的血管緊張素Ⅱ培養(yǎng)24小時(shí),提取BMSCs的總RNA進(jìn)行RT-PCR檢測(cè)Bcl-2及Bax的表達(dá)情況。 結(jié)果:與對(duì)照組相比,缺血缺氧組BMSCs的細(xì)胞活力明顯下降(P0.01);與單純?nèi)毖毖踅M比較,加入血管緊張素Ⅱ組的BMSCs Bcl-2的表達(dá)上調(diào)(P0.01),Bax的表達(dá)下調(diào)(P0.01),Bcl-2/Bax比值增大(P0.01),0.1μm/L的血管緊張素Ⅱ?qū)cl-2和Bax的表達(dá)影響較0.01μm/L顯著(P0.05),而與1μm/L血管緊張素Ⅱ比較無顯著差異(P0.05)。 結(jié)論:以缺氧無血清條件模擬細(xì)胞缺血缺氧條件下BMSCs的增殖和細(xì)胞活力明顯下降;正常條件下培養(yǎng)的BMSCs不表達(dá)或低表達(dá)凋亡相關(guān)基因Bcl-2和Bax;血管緊張素Ⅱ可增強(qiáng)缺血缺氧條件下BMSCs的抗凋亡能力,這一過程可能是通過升高Bcl-2/Bax比值來實(shí)現(xiàn)的。
[Abstract]:Background: stem cell transplantation is an important therapeutic method to improve cardiac function rapidly in recent years, in which bone marrow mesenchymal stem cell (Bone Mesenchymal stemcells, BMSCs).) is the most studied. However, it also faces a series of challenges, the most important of which is the survival of stem cells in the infarcted area after transplantation. More than 90% of BMSCs will die within days after transplantation. Therefore, how to improve the survival rate of BMSCs after transplantation is the key to improve the stem cell therapy of ischemic heart disease. Angiotensin 鈪
本文編號(hào):2271129
[Abstract]:Background: stem cell transplantation is an important therapeutic method to improve cardiac function rapidly in recent years, in which bone marrow mesenchymal stem cell (Bone Mesenchymal stemcells, BMSCs).) is the most studied. However, it also faces a series of challenges, the most important of which is the survival of stem cells in the infarcted area after transplantation. More than 90% of BMSCs will die within days after transplantation. Therefore, how to improve the survival rate of BMSCs after transplantation is the key to improve the stem cell therapy of ischemic heart disease. Angiotensin 鈪
本文編號(hào):2271129
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