醫(yī)學(xué)免費(fèi)論文:細(xì)胞間黏附分子1在紅霉素抗炎機(jī)制中的作用
【摘要】 目的 從分子水平上探討紅霉素(EM)的抗炎作用機(jī)制。方法 體外培養(yǎng)人支氣管上皮細(xì)胞(16HBE),將細(xì)胞隨機(jī)分為8組,先加入EM干預(yù),后加入腫瘤壞死因子α(TNFα)刺激。分組如下:①空白對(duì)照組;②TNFα(20 ng/ml,16 h)組;③EM(0.3 μg/ml,24 h)+TNFα(20 ng/ml,16 h)組;④EM(3 μg/ml,24 h)+TNFα(20 ng/ml,16 h)組;⑤EM(30 μg/ml,24 h)+TNFα(20 ng/ml,16 h)組;⑥EM(0.3 μg/ml,48 h)+TNFα(20 ng/ml,16 h)組;⑦EM(3 μg/ml,48 h)+TNFα(20 ng/ml,16 h)組;⑧EM(30 μg/ml,48 h)+TNFα(20 ng/ml,16 h)。然后收集各組細(xì)胞分別提取RNA,應(yīng)用逆轉(zhuǎn)錄聚合酶鏈反應(yīng)(RTPCR)方法檢測(cè)細(xì)胞間黏附分子1(ICAM1) mRNA的表達(dá)。因ICAM1 RTPCR產(chǎn)物分子大小約為700 bp,與原設(shè)計(jì)產(chǎn)物分子大小490 bp不相符,進(jìn)一步作基因克隆測(cè)序了解基因之間是否具有同源性。結(jié)果 ICAM1的RTPCR產(chǎn)物即為目的基因:ICAM1基因。TNFα刺激人支氣管上皮細(xì)胞(16HBE)后,細(xì)胞ICAM1mRNA表達(dá)增高。先加入不同濃度及作用時(shí)間的EM,后加入TNFα刺激人支氣管上皮細(xì)胞(16HBE),各組細(xì)胞ICAM1mRNA表達(dá)均降低,且提示有濃度與時(shí)間依賴性。結(jié)論 TNFα能激活人支氣管上皮細(xì)胞使其ICAM1基因表達(dá)增高,促進(jìn)炎癥的發(fā)生發(fā)展。EM能抑制人支氣管上皮細(xì)胞ICAM1基因表達(dá),可能是EM的抗炎作用機(jī)制之一。
【關(guān)鍵詞】 人支氣管上皮細(xì)胞;細(xì)胞間黏附分子1;腫瘤壞死因子α;紅霉素
Expression of intercellular adhesion molecule 1 mRNA in the antiinflammatory molecular mechanism of erythromycin醫(yī).學(xué).全.在.線bhskgw.cn
LI MeiHua, ZHONG XiaoNing, LIU GuangNan,et al.
Department of Resperatory, the First Affiliated Hospital of Guangxi Medical University, Nanning 530021, Guangxi, China
【Abstract】 Objective To investigate the antiinflammatory molecular mechanism of erythromycin (EM) in order to find a new way to prevent and treat chronic obstructive pulmonary disease (COPD). Methods Human bronchial epithelial cell line 16HBE was cultured with 10% serum DMEM (high glucose). The cells were randomly divided into eight groups: blank control group, TNFα (20 ng/ml,16 h), EM(0.3 μg/ml,24 h)+TNFα (20 ng/ml,16 h), EM(3 μg/ml,24 h)+TNFα (20 ng/ml,16 h), EM(30 μg/ml,24 h)+TNFα(20 ng/ml,16 h), EM(0.3 μg/ml,48 h)+TNFα (20 ng/ml,16 h), EM(3 μg/ml,48 h)+TNFα(20 ng/ml,16 h), and EM(30 μg/ml,48 h)+TNFα (20 ng/ml,16 h). Then total cellular RNA was extracted to detect the expression of ICAM1 mRNA by RTPCR. The molecular size of ICAM1 RTPCR production was not correspondent for what it was designed,therefore,clone sequencing was applied to confirm it. Results ICAM1 RTPCR production was ICAM1 mRNA. ICAM1mRNA was increased by the addition of TNFα,which was inhibited by the preincubation with EM in dosedependent and timedependent fasion. Conclusions ICAM1mRNA can be increased by the stimulation of TNFα, which indicate that EM modify inflammation presumably by suppressing ICAM1mRNA in human bronchial epithelial cells.
【Key words】 Human bronchial epithelial cells;ICAM1;TNFα;Erythromycin
長(zhǎng)期應(yīng)用小劑量紅霉素(EM)治療慢性氣道感染性疾病〔彌漫性泛細(xì)支氣管炎、支氣管哮喘、支氣管擴(kuò)張、慢性阻塞性肺病等(COPD)〕取得良好的效果已經(jīng)得到臨床資料證實(shí)〔1~4〕。研究發(fā)現(xiàn),這種療效與EM抗菌活性無(wú)關(guān),而與EM的抗炎活性密切相關(guān)〔5,6〕。EM在體內(nèi)外對(duì)許多致炎細(xì)胞因子的產(chǎn)生均有調(diào)節(jié)作用,但是,EM抗炎作用機(jī)制仍不清楚。本實(shí)驗(yàn)設(shè)計(jì)研究EM對(duì)ICAM1基因表達(dá)的影響,從分子水平上探討EM的抗炎作用機(jī)制,為臨床防治老年慢性阻塞性肺病提供新的思路。
1 材料與方法
1.1 材料 高糖(DMEM)培養(yǎng)基為Hyclone公司產(chǎn)品,胎牛血清為杭州四季青生物工程材料有限公司產(chǎn)品,腫瘤壞死因子(TNFα)系Sigma公司產(chǎn)品,EM系A(chǔ)mresco公司產(chǎn)品?俁NA提取試劑Trizol購(gòu)自Invitrogen公司,AMV逆轉(zhuǎn)錄酶和dNTPs購(gòu)自美國(guó)Promega公司,TaqDNA聚合酶購(gòu)自TAKARA公司,DEPC系美國(guó)Serva公司產(chǎn)品,瓊脂糖購(gòu)自上海生工生物工程公司。瓊脂糖凝膠回收試劑盒及pGEMTeasy試劑盒(含T4 DNA連接酶)系Qbiogene公司產(chǎn)品。常規(guī)試劑:異丙醇、乙醇、氯仿、Tris粉、EDTA等系國(guó)產(chǎn)分析純?cè)噭。OligodT15,βactin引物:上游5′TGACGGTCAGGTCATCACTATCGGCAATGA3′,下游5′TTGATCTTCATGGTG(AGC) TAGGAGCGAGGGCA 3′,由上海生工生物工程公司合成。ICAM1引物:上游5′AGGTGGCCGGCCAGCTTATA3′,下游5′CCTGTCCCGGGATAGGTTCA3′,由北京奧科生物技術(shù)有限責(zé)任公司合成。