劉華 康美尼 王興華
摘 要:目的 探究不同濃度的替格瑞洛對氧化型低密度脂蛋白誘導(dǎo)的人臍靜脈內(nèi)皮細(xì)胞在蛋白及RNA水平表達(dá)細(xì)胞間黏附分子-1的影響。方法 離體培養(yǎng)人臍靜脈內(nèi)皮細(xì)胞,平均接種于6孔培養(yǎng)板,待細(xì)胞生長至融合狀態(tài)時取三孔加入ox-LDL(50 μg/ml),再分別加入不同濃度的替格瑞洛(0、20、40 μmol/L)。刺激干預(yù)24 h后采用Western Blot法測定ICAM-1的蛋白表達(dá)水平。重復(fù)實驗,采用Real-time PCR法測定ICAM-1的RNA表達(dá)水平。結(jié)果 ①oxLDL能明顯上調(diào)ICAM-1的表達(dá);②Western Blot蛋白定量結(jié)果顯示,oxLDL誘導(dǎo)組ICAM-1的蛋白表達(dá)明顯高于對應(yīng)的非誘導(dǎo)組(P<0.05);未予替格瑞洛干預(yù)組ICAM-1的蛋白表達(dá)高于替格瑞洛低濃度組(P<0.05);替格瑞洛低濃度組ICAM-1的蛋白表達(dá)高于替格瑞洛高濃度組(P<0.05);③Real-time PCR結(jié)果與Western Blot蛋白定量結(jié)果一致。結(jié)論 oxLDL能在RNA水平提高ICAM-1表達(dá),替格瑞洛能在RNA水平抑制ICAM-1的表達(dá),并與濃度正相關(guān)。
關(guān)鍵詞:替格瑞洛;人臍靜脈內(nèi)皮細(xì)胞;氧化型低密度脂蛋白;細(xì)胞間黏附分子-1
中圖分類號:R543 文獻(xiàn)標(biāo)識碼:A DOI:10.3969/j.issn.1006-1959.2018.22.022
文章編號:1006-1959(2018)22-0081-04
Effect of Ticagrelor on the Expression of ICAM-1 in Human umbilical Vein Endothelial Cells Induced by oxLDL
LIU Hua1,2,KANG Mei-ni2,WANG Xing-hua2,LIANG Xue2,LI Guang-ping2
(1.Department of Cardiology,Cangzhou Central Hospital,Cangzhou 061000,Hebei,China;
2.Institute of Cardiology,Second Hospital,Tianjin Medical University,Tianjin 300211,China)
Abstract:Objective To investigate the effects of different concentrations of ticagrelor on the expression of intercellular adhesion molecule-1 in human umbilical vein endothelial cells induced by oxidized low density lipoprotein at protein and RNA levels.Methods Human umbilical vein endothelial cells were cultured in vitro and seeded on a 6-well culture plate. When the cells were grown to the fusion state, ox-LDL (50 μg/ml) was added to the wells, and different concentrations of ticagrelor were added(0, 20, 40 μmol/L). The protein expression level of ICAM-1 was determined by Western Blot after 24 h of stimulation. The experiment was repeated and the RNA expression level of ICAM-1 was determined by Real-time PCR. Results ①oxLDL could up-regulate the expression of ICAM-1.②Western Blot protein quantitation results showed that the protein expression of ICAM-1 in oxLDL-induced group was significantly higher than that in the corresponding non-inducing group(P<0.05);The protein expression of ICAM-1 in the Ticagrelor-free group was higher than that in the tigrisin group (P<0.05). The protein expression of ICAM-1 in the low-concentration group was higher than that in the Ticagrelor group(P<0.05); ③Real-time PCR results were consistent with Western Blot protein quantitation results. Conclusion oxLDL can increase the expression of ICAM-1 at the RNA level, and ticagrelor can inhibit the expression of ICAM-1 at the RNA level, and it is positively correlated with the concentration.
Key words:Ticagrelor;Human umbilical vein endothelial cells;Oxidized low density lipoprotein; Intercellular adhesion molecule-1
隨著近年來信號傳導(dǎo)和基因調(diào)控水平的研究,動脈粥樣硬化發(fā)病機制愈發(fā)傾向于炎癥損傷應(yīng)答學(xué)說。粘附分子是炎癥的始動因子和標(biāo)志物,在動脈粥樣硬化早期炎癥中起著重要的作用。黏附分子-1(ICAM-1)是一種非常重要的具有代表性的粘附因子,在靜息的內(nèi)皮細(xì)胞上呈低水平表達(dá)或不表達(dá),但在氧化型低密度脂蛋白(oxLDL)等炎性損傷因子刺激下能迅速上調(diào),導(dǎo)致白細(xì)胞停止?jié)L動粘附于內(nèi)皮細(xì)胞,導(dǎo)致一系列心血管病理改變。替格瑞洛(Tigeralor)作為新型抗血小板藥物,在發(fā)揮抗血小板作用的同時,同時是否具有抗炎癥損傷作用。
1 材料與方法
1.1材料
1.1.1細(xì)胞系 人臍靜脈內(nèi)皮細(xì)胞(human umbilical vein endothelial cells,HUVECs)CRL-1730由天津市心血管疾病研究所贈與,其培養(yǎng)基為含10%胎牛血清(fetal bovine serum,F(xiàn)BS)的DMEM-F12。
1.1.2主要試劑 DMEM-12培養(yǎng)基(GIBC,美國);oxLDL(北京欣源佳和生物科技有限公司,北京);Tigeralor原粉(上海鉑力生物科技有限公司,上海);鼠抗ICAM-1單抗(北京中山金橋,北京);鼠抗GAPDH單克隆IgG(Abcam,USA);Page Rulert Prestained Protein Ladder(Fermentas,USA);引物序列ICAM-1(Forward 5'-CCCTTCCCCCCAAAACTG-3' Rerverse 5'-GTCATTGTGAACACTGGCAGAAA-3')β-actin(Forward 5'-CGTGACATTAAGGAGAAGCTG-3'Reverse 5'-CTAGAAGCATTTGCGGTGGAC-3')英淮捷基貿(mào)易有限公司設(shè)計合成。
1.1.2主要儀器 超凈工作臺(蘇州凈化設(shè)備有限公司,江蘇);Eppendorf低溫離心機(eppendorf,德國);細(xì)胞培養(yǎng)箱(Thermo Forma,USA);6孔培養(yǎng)板(Corning,USA);微量移液管(Brand accu-jet,USA);紫外可見光分光光度計(Eppendrof,USA);電子天平(北京多賽斯儀器系統(tǒng)有限公司,北京);MilliQ超純水系統(tǒng)(Milipore, 法國);穩(wěn)壓穩(wěn)流電泳儀(Becton,Dickinson and Company,USA);電轉(zhuǎn)膜儀(Becton,Dickinson and Company,USA);水平搖床(Becton,Dickinson and Company,USA);ABi7500實時定量PCR儀(ABI,美國)。
1.2方法
1.2.1 HUVECs細(xì)胞復(fù)蘇與傳代培養(yǎng) 從液氮罐取出凍存管,37 ℃水浴中融化后,離心棄上清;加入12 ml10%FBS,1%雙抗的DMEM-F12培養(yǎng)液,混勻后移入細(xì)胞培養(yǎng)皿;觀察細(xì)胞數(shù)量狀態(tài),將培養(yǎng)瓶放入37 ℃、5%CO2的培養(yǎng)箱內(nèi),次日待細(xì)胞貼壁后,換新鮮培養(yǎng)液繼續(xù)培養(yǎng)。當(dāng)鏡下細(xì)胞密度達(dá)80%可進(jìn)行細(xì)胞胰酶消化傳代培養(yǎng)。傳代培養(yǎng)2~3代后,將狀態(tài)良好的細(xì)胞平均分裝于6孔培養(yǎng)板,待6孔板細(xì)胞密度達(dá)70%細(xì)胞生長至融合狀態(tài)時,進(jìn)行刺激和干預(yù)。
1.2.2 oxLDL刺激與替格瑞洛干預(yù) 將替格瑞洛原粉5 mg溶解于100 μl DMSO中,用培養(yǎng)液按1:100稀釋,得到濃度為1 μmol/ml的藥物干預(yù)液。向6孔板內(nèi)分別加入oxLDL及替格瑞洛,進(jìn)行刺激和干預(yù)。分組如下:1組:培養(yǎng)液1 ml,替格瑞洛0;2組:培養(yǎng)液1 ml,替格瑞洛20 μl(20 μmol/ml);3組:培養(yǎng)液1 ml,替格瑞洛40 μl(40 μmol/ml);4組:培養(yǎng)液1 ml,oxLDL38ul(50 μg/ml),替格瑞洛0;5組:培養(yǎng)液1 ml,oxLDL38ul(50 μg/ml),替格瑞洛20 μl(20 μmol/ml);6組:培養(yǎng)液1ml,oxLDL38 μl(50 μg/ml),替格瑞洛40 μl(40 μmol/ml)。其中1~3組為非oxLDL誘導(dǎo)組,4~6組為oxLDL誘導(dǎo)組。將6孔板置于37 ℃、5%CO2的培養(yǎng)箱內(nèi)繼續(xù)培養(yǎng)24 h。
1.2.3 Western Blot蛋白定量 分別提取各組蛋白,采用Western Blot進(jìn)行蛋白定量,經(jīng)制膠、電泳、轉(zhuǎn)膜、封閉、孵育、曝光后取得膠片。膠片用LabWorksTM凝膠成像及分析系統(tǒng)對目的條帶和GAPDH(持家基因內(nèi)參)條帶進(jìn)行攝像,測量條帶的灰度值;比較各組校準(zhǔn)后蛋白條帶灰度值的關(guān)系,并以未經(jīng)刺激干預(yù)組為其標(biāo)準(zhǔn)值,計算各組條帶相對灰度值并繪制柱狀圖。
1.2.4實時定量PCR 分別提取RNA,先反轉(zhuǎn)錄DNA,再以Real-time PCR法進(jìn)行RNA定量測定。引物序列:ICAM-1 Forward:5'-CCCTTCCCCCCAAAACTG-3' Rerverse:5'-GTCATTGTGAACACTGGCAGAAA-3';β-actin Forward:5'-CGTGACATTAAGGAGAAGCTG-3' Reverse:5'-CTAGAAGCATTTGCGGTGGAC-3'。Real-time PCR反應(yīng)40個循環(huán)后,自帶軟件自動進(jìn)行數(shù)據(jù)分析并繪制柱狀圖:Folds=2-ΔΔCt;ΔΔCt=(Ct1-Ct2)-(Ct3-Ct4);Ct1=處理樣品待測基因的臨界循環(huán)數(shù);Ct2=處理樣品持家基因β-actin的臨界循環(huán)數(shù);Ct3=對照樣品待測基因的臨界循環(huán)數(shù);Ct4=對照樣品持家基因β-actin的臨界循環(huán)數(shù)。
1.3統(tǒng)計學(xué)統(tǒng)計 重復(fù)試驗,采用SPSS16.0軟件,計量資料以(x±s)表示,多組樣本平均數(shù)的比較采用采用舉因素方差分析(one-wayANOVA),兩兩比較采用LSD-t法,P<0.05認(rèn)為差異有統(tǒng)計學(xué)意義。
2 結(jié)果
2.1 Western Blot蛋白定量結(jié)果 oxLDL誘導(dǎo)組ICAM-1的蛋白表達(dá)高于對應(yīng)的非誘導(dǎo)組(P<0.05);未予替格瑞洛干預(yù)組ICAM-1的蛋白表達(dá)替格瑞洛低濃度組(P<0.05);替格瑞洛低濃度組ICAM-1的蛋白表達(dá)高于替格瑞洛高濃度組(P<0.05),見表1、圖1。
2.2 Real-time PCR結(jié)果 oxLDL誘導(dǎo)組ICAM-1的蛋白表達(dá)高于對應(yīng)的非誘導(dǎo)組;未予替格瑞洛干預(yù)組ICAM-1的蛋白表達(dá)替格瑞洛低濃度組;替格瑞洛低濃度組ICAM-1的蛋白表達(dá)替格瑞洛高濃度組。結(jié)果與WesternBlot蛋白定量一致,見圖2、表2。
3討論
隨著近年來信號傳導(dǎo)和基因調(diào)控水平的研究,動脈粥樣硬化發(fā)病機制愈發(fā)傾向于炎癥損傷應(yīng)答學(xué)說。粘附分子是炎癥的始動因子和標(biāo)志物,在動脈粥樣硬化早期炎癥中起著重要的作用,是多種血管損傷途徑的共同通路[1-3]。ICAM-1作為重要的粘附因子,在血管內(nèi)皮細(xì)胞表達(dá)最高,其次為外周白細(xì)胞。在靜息內(nèi)皮細(xì)胞上呈低水平表達(dá)或不表達(dá),在TNF-α、oxLDL、IL等炎性損傷因子刺激下迅速上調(diào)[4]。ICAM-1與P-selectin、E-selecin作用后,與整合素家族CD11a/CD18高親和相互作用,導(dǎo)致白細(xì)胞停止?jié)L動,穩(wěn)定粘附于內(nèi)皮細(xì)胞。血管內(nèi)皮、心肌細(xì)胞與白細(xì)胞相互激活,產(chǎn)生和釋放氧自由基和血管活性物質(zhì)等因子,形成炎癥瀑布,導(dǎo)致血管損傷,產(chǎn)生一系列病理改變[5]。心血管藥物的抗炎癥損傷作用一直是研究熱點。既往研究表明,許多心血管藥物在發(fā)揮其他藥物作用的同時還有抗炎癥損傷作用。替格瑞洛不需要代謝活化便可拮抗 ADP介導(dǎo)血小板聚集作用,起效更迅速[6],可以改善ACS和PCI治療的療效,以及限制死亡率和心血管事件的發(fā)生率[7,8]。此外,替格瑞洛屬于碳環(huán)核苷類藥物,它還通過增加血液中腺苷濃度使心血管患者受益[9]。
本研究顯示,oxLDL能在RNA水平提高ICAM-1表達(dá);替格瑞洛能在RNA水平抑制ICAM-1的表達(dá),并與濃度正相關(guān)。替格瑞洛能夠在RNA水平下調(diào)ICAM-1因子,進(jìn)而減少血管內(nèi)皮與白細(xì)胞的粘附作用,減少血管內(nèi)皮損傷改善患者預(yù)后,與其他相關(guān)研究相符合[10]。替格瑞洛藥物多效性可能會為心血管系統(tǒng)疾病的預(yù)防治療提供新的思路。
綜上所述,替格瑞洛在發(fā)揮抗血小板作用的同時,還能夠在RNA水平抑制粘附因子ICAM-1的表達(dá),具有抗炎癥損傷的作用,進(jìn)而減少血管內(nèi)皮損傷改善患者預(yù)后。
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收稿日期:2018-7-1;修回日期:2018-8-1
編輯/雷華