胡家平,莊建新,李勇,余永歡,胡慶紅,賴(lài)銀英,吳安濤
TNF-α和HSP70-2基因多態(tài)性與急性胰腺炎的相關(guān)性研究
胡家平,莊建新△,李勇,余永歡,胡慶紅,賴(lài)銀英,吳安濤
目的探討腫瘤壞死因子(TNF)-α和熱休克蛋白(HSP)70-2基因多態(tài)性與急性胰腺炎(AP)的相關(guān)性。方法運(yùn)用聚合酶鏈?zhǔn)椒磻?yīng)-限制性片段長(zhǎng)度多態(tài)性(PCR-RLFP)檢測(cè)72例AP患者(AP組)和71例正常人(對(duì)照組)的TNF-α及HSP70-2基因多態(tài)性。結(jié)果AP組與對(duì)照組的TNF-α基因型和等位基因比例間差異無(wú)統(tǒng)計(jì)學(xué)意義;AP組中,重型胰腺炎(SAP)和輕型胰腺炎(MAP)的TNF-α基因型和等位基因間差異無(wú)統(tǒng)計(jì)學(xué)意義。TNF-α和HSP70-2基因AA型與GA+GG型患者的白細(xì)胞、C反應(yīng)蛋白(CRP)、淀粉酶、三酰甘油、血糖差異均無(wú)統(tǒng)計(jì)學(xué)意義;AP組的HSP70-2基因GA+GG型患者比例高于對(duì)照組(69.4%vs 49.3%),AP組攜帶的G等位基因比例高于對(duì)照組(46.5%vs 31.7%),差異均有統(tǒng)計(jì)學(xué)意義。AP組中,SAP的GA+GG型比例高于MAP(81.0%vs 53.3%),差異有統(tǒng)計(jì)學(xué)意義;而G等位基因在SAP和MAP間無(wú)明顯差異(P>0.05)。結(jié)論TNF-α基因多態(tài)性與AP不相關(guān),HSP70-2基因多態(tài)性與AP相關(guān),攜帶G等位基因發(fā)生重癥AP的可能性增大,可能是重癥AP的易感因素之一。
腫瘤壞死因子α;HSP70熱休克蛋白質(zhì)類(lèi);胰腺炎;基因多態(tài)性;HSP70-2;多態(tài)性,限制性片斷長(zhǎng)度;聚合酶鏈反應(yīng)
急性胰腺炎(acute pancreatitis,AP)是指多種病因引起的胰酶激活,繼以胰腺局部炎癥反應(yīng)為主要特征,伴或不伴有其他器官功能改變的疾病。臨床上,大多數(shù)AP患者的病程呈自限性,20%~30%的患者臨床過(guò)程兇險(xiǎn),病死率可達(dá)5%~10%[1]。目前其發(fā)病機(jī)制尚未完全闡明,研究發(fā)現(xiàn)在AP早期,胰腺星狀細(xì)胞中的促炎因子表達(dá)上調(diào)[2]。遺傳因子特別是AP相關(guān)的炎癥因子,可能是胰腺損傷甚至是AP嚴(yán)重程度和炎癥進(jìn)展中一個(gè)重要的易感因素。單核苷酸多態(tài)性(single nucleotide polymorphisms,SNPs)數(shù)量巨大,分布廣,目前被認(rèn)為是最有價(jià)值的遺傳標(biāo)記[3]。有研究報(bào)道腫瘤壞死因子(TNF)-α和熱休克蛋白(HSP)70-2基因多態(tài)性與多種炎癥性疾病有關(guān)[4-5],但關(guān)于TNF-α和HSP70-2基因多態(tài)性與AP易感性的相關(guān)研究較少,本研究檢測(cè)TNF-α及HSP70-2的基因多態(tài)性,并探討其與AP的關(guān)系。
1.1 研究對(duì)象選取2012年6月—2013年2月在我院就診的發(fā)病72 h內(nèi)的AP患者72例作為AP組,年齡(54.9± 14.1)歲。診斷標(biāo)準(zhǔn)符合中華醫(yī)學(xué)會(huì)消化病學(xué)分會(huì)胰腺疾病學(xué)組制定標(biāo)準(zhǔn)[1]及中華醫(yī)學(xué)會(huì)外科學(xué)會(huì)胰腺外科學(xué)組制定標(biāo)準(zhǔn)[6]。其中輕型胰腺炎(MAP)30例,重型胰腺炎(SAP)42例。選擇同期我院查體健康人71例為對(duì)照組,年齡(50.6± 13.9)歲。
1.2 TNF-α及HSP70-2基因多態(tài)性檢測(cè)
1.2.1 引物擴(kuò)增采研究對(duì)象外周血3 mL于EDTA抗凝管。采用經(jīng)典苯酚-氯仿提取法從全血中提取基因組DNA,溶解于50 μLTE液中,-20℃冰箱保存。參考文獻(xiàn)[7]及GenBank設(shè)計(jì)引物,由Invitrogen公司合成。TNF-α引物:上游5′-AGGCAATAGGTTTTGAGGGCCAT-3′,下游5′-TCCTCCCTGCTCCGATTCCG-3′,擴(kuò)展片段長(zhǎng)度107 bp;HSP70-2引物:上游5′-CAGCAAAGTCCTTGAGTCCC-3′,下游5′-TCCGAAGGACTGGAGCTCTTG-3′,擴(kuò)展片段長(zhǎng)度2 075 bp。TNF-α和HSP70-2 PCR反應(yīng)體系均為50 μL:取DNA模板1 μL,分別加入TNF-α和HSP70-2引物,然后加入TaqDNA合成酶。擴(kuò)增條件:(1)TNF-α。95℃預(yù)變性5 min;95℃30 s,60℃30 s,72℃45 s,共35個(gè)循環(huán),最后72℃延伸10 min;(2)HSP70-2。94℃預(yù)變性5 min;95℃1 min,60℃1 min,72℃3 min,共35個(gè)循環(huán),最后72℃延伸10 min。
1.2.2 酶切反應(yīng)取10 μLTNF-αPCR產(chǎn)物加入NcoⅠ限制性內(nèi)切酶,10 μL HSP70-2 PCR產(chǎn)物加入PstⅠ限制性內(nèi)切酶,均在37℃恒溫水浴鍋過(guò)夜。于2%瓊脂糖凝膠電泳下分析TNF-α酶切產(chǎn)物,1%瓊脂糖凝膠電泳下分析HSP70-2酶切產(chǎn)物,與標(biāo)準(zhǔn)DNA Marker比對(duì)。
1.3 統(tǒng)計(jì)學(xué)方法應(yīng)用SPSS17.0軟件包進(jìn)行統(tǒng)計(jì)分析,基因型及等位基因頻率采用例(%)表示,組間比較采用χ2檢驗(yàn);計(jì)量資料用或M(P25,P75)表示,組間比較采用t檢驗(yàn)或非參Z檢驗(yàn),P<0.05為差異有統(tǒng)計(jì)學(xué)意義。
2.1 TNF-α、HSP70-2基因PCR產(chǎn)物酶切結(jié)果TNF-α基因PCR產(chǎn)物經(jīng)NcoⅠ酶切后凝膠電泳結(jié)果顯示GG型(87 bp+20 bp,由于20 bp太小無(wú)法顯示,但不影響結(jié)果判定)、GA型(107 bp+87 bp+20 bp,圖中未見(jiàn)此型)和AA型(107 bp);HSP70-2基因PCR產(chǎn)物經(jīng)PstⅠ酶切后凝膠電泳結(jié)果顯示GG型(1 139 bp+936 bp)、GA型(2 075 bp+1 139 bp+ 936 bp)和AA型(2 075 bp),見(jiàn)圖1、2。
Fig.1TNF-α polymorphism in the result of 2%sepharose electrophoresis圖1 TNF-α基因多態(tài)性2%瓊脂糖凝膠電泳結(jié)果
Fig.2HSP70-2 polymorphism in the result of the 1%sepharose electrophoresis圖2 HSP70-2基因多態(tài)性1%瓊脂糖凝膠電泳結(jié)果
2.2 TNF-α基因多態(tài)性與AP易感性的關(guān)系A(chǔ)P組與對(duì)照組的TNF-α基因型和等位基因比例間差異無(wú)統(tǒng)計(jì)學(xué)意義,見(jiàn)表1;AP組中,SAP組和MAP組的TNF-α基因型和等位基因間差異無(wú)統(tǒng)計(jì)學(xué)意義,見(jiàn)表2。
Tab.1Comparison of TNF-α genotype and allele between AP group and control group表1 AP組和對(duì)照組TNF-α基因型和等位基因比較例(%)
Tab.2Comparison of TNF-α genotype and allele between SAP and MAP groups表2 SAP組和MAP組的TNF-α基因型和等位基因比較例(%)
2.3 不同TNF-α基因型患者的有關(guān)臨床檢驗(yàn)參數(shù)比較TNF-α基因AA型與GA+GG型患者的白細(xì)胞、CRP、淀粉酶、三酰甘油、血糖差異均無(wú)統(tǒng)計(jì)學(xué)意義,見(jiàn)表3。
Tab.3Comparison of clinical laboratory parameters between AP patients with different TNF-α genotypes表3 不同TNF-α基因型AP患者的臨床檢驗(yàn)參數(shù)比較
2.4 HSP70-2基因多態(tài)性與AP易感性的關(guān)系A(chǔ)P組的HSP70-2基因GA+GG型患者比例高于對(duì)照組,AP組攜帶的G等位基因比例高于對(duì)照組(均P<0.05),見(jiàn)表4。AP組中,SAP組的GA+ GG型比例高于MAP組;而G等位基因在SAP組和MAP組間無(wú)明顯差異(P>0.05),見(jiàn)表5。
Tab.4Comparison of HSP70-2 genotype and allele between AP group and control group表4 AP組和對(duì)照組HSP70-2基因型和等位基因比較例(%)
2.5 不同HSP70-2基因型患者的有關(guān)臨床檢驗(yàn)參數(shù)比較HSP70-2基因AA型與GA+GG型患者的白細(xì)胞、血糖、CRP、淀粉酶、三酰甘油差異均無(wú)統(tǒng)計(jì)學(xué)意義,見(jiàn)表6。
Tab.5Comparison of HSP70-2 genotype and allele between SAP and MAP groups表5 SAP組和MAP組HSP70-2基因型和等位基因比較例(%)
Tab.6Comparison of clinical laboratory parameters between AP patients with different HSP70-2 genotypes表6 不同HSP70-2基因型AP患者的臨床檢驗(yàn)參數(shù)比較
AP是常見(jiàn)的消化系統(tǒng)疾病之一,是因早期炎癥使胰腺腺泡中的胰酶過(guò)早激活導(dǎo)致自身組織消化的過(guò)程[8],其病理過(guò)程包括水腫、出血和壞死。TNF-α在AP的血清中是可以被檢測(cè)出來(lái)的。在炎癥反應(yīng)早期,TNF-α可以激活中性粒細(xì)胞,促進(jìn)多種炎癥介質(zhì)釋放,在AP的發(fā)生發(fā)展過(guò)程中起重要作用[9]。本研究結(jié)果顯示:AP組與對(duì)照組的TNF-α基因型和等位基因無(wú)明顯差異;輕癥和重癥AP間也無(wú)明顯差異,雖然GG型比例在AP中所占比例較高(72.2%,52/72);且不同基因型的血液檢測(cè)指標(biāo)亦無(wú)明顯差異,提示TNF-α基因的多態(tài)性可能與AP發(fā)病、嚴(yán)重程度及血液指標(biāo)無(wú)關(guān)。與?zhan等[10]、Yang等[11]的研究結(jié)論基本一致。但也有不一致的研究,Balog等[7]研究發(fā)現(xiàn)TNF-α的308A位點(diǎn)基因多態(tài)性是SAP的影響因素,其認(rèn)為基因型檢測(cè)可以預(yù)測(cè)輕重癥AP的過(guò)程和預(yù)后。Dianliang等[12]研究表明TNF-α-308位點(diǎn)多態(tài)性與AP不相關(guān),但與AP的膿毒血癥相關(guān)。以上研究結(jié)果的不同可能與不同種族、地域及樣本量差異有關(guān),尚需開(kāi)展多中心、大樣本的試驗(yàn)進(jìn)行研究。
HSP70-2蛋白作為轉(zhuǎn)換蛋白的分子伴侶,參與受損蛋白質(zhì)的修復(fù),使其恢復(fù)活性,從而在蛋白水平起到預(yù)防、保護(hù)的作用[13],在受到炎癥、受熱、缺血、缺氧或代謝性毒物等因素刺激時(shí),細(xì)胞內(nèi)迅速表達(dá)HSP70-2[14]。本研究結(jié)果顯示:AP組GA+GG型比例高于對(duì)照組;AP組攜帶G等位基因的比例高于對(duì)照組。AP組中SAP的GA+GG型比例高于MAP;而G等位基因在SAP和MAP間無(wú)明顯差異。Balog等[7]研究發(fā)現(xiàn),重癥AP患者攜帶HSP-70-2等位基因G的比例高于輕癥AP患者和健康人群,而具有AA型基因的AP,很少發(fā)展為重癥胰腺炎,HSP70-2等位基因G是急性重癥胰腺炎的危險(xiǎn)因素,與本研究結(jié)果一致。
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(2014-07-15收稿2014-09-02修回)
(本文編輯閆娟)
Polymorphisms of TNF-α gene and HSP70-2 gene in patients with acute pancreatitis
HU Jiaping,ZHUANG Jianxin△,LI Yong,YU Yonghuan,HU Qinghong,LAI Yinying,WU Antao
The First Affiliated Hospital of Nanchang University,Nanchang 330006,China△
ObjectiveTo investigate the association of tumor necrosis factor(TNF)-α,heat shock protein(HSP)70-2 gene polymorphisms and susceptibility of acute pancreatitis(AP).MethodsUsing case-control method,The gene polymorphism of TNF-α and HSP70-2 was detected by PCR-RLFP in 72 patients with AP and 71 healthy controls.Results There were no significant differences in proportion of TNF-α genotype and alleles between AP and control groups(P>0.05). There were no significant differences in TNF-α genotype and alleles between severe acute pancreatitis(SAP)and light acute pancreatitis(MAP)of AP group(P>0.05).There were no significant differences in white blood cell count,C-reactive protein(CRP),amylase,three acyl glycerin and glucose between TNF-a and HSP70-2 gene of AA type and GA+GG type patients(P>0.05).The HSP70-2 genotype GA+GG proportion was significantly higher in AP group than that of control group(69.4%vs 49.3%).The ratio of patients with G allele was significantly higher in AP group than that of control group(46.5% vs 31.7%).The ratio of patients with GA+GG type AP was significantly higher in SAP patients than that of MAP patients of AP group(81.0%vs 53.3%).There was no significant difference in G allele between SAP and MAP patients(P>0.05). ConclusionTNF-α polymorphisms is not associated with acute pancreatitis.There is an association between HSP70-2 polymorphisms and acute pancreatitis.Carrying the G allele increases the possibility of a severe acute pancreatitis,which is one of the genetic susceptibility factors of severe acute pancreatitis.
tumor necrosis factor-alpha;HSP70 heat-shock proteins;pancreatitis;genetic polymorphism;HSP70-2;polymorphism,restriction fragment length;polymerase chain reaction
R576
A
10.3969/j.issn.0253-9896.2015.01.015
江西省科技廳支撐計(jì)劃
南昌大學(xué)第一附屬醫(yī)院普外科五病區(qū)(郵編330006)
胡家平(1967),男,副主任醫(yī)師,副教授,碩士生導(dǎo)師,碩士,主要從事胃腸腫瘤研究
△通訊作者E-mail:zjx136@qq.com