亚洲免费av电影一区二区三区,日韩爱爱视频,51精品视频一区二区三区,91视频爱爱,日韩欧美在线播放视频,中文字幕少妇AV,亚洲电影中文字幕,久久久久亚洲av成人网址,久久综合视频网站,国产在线不卡免费播放

        ?

        miR—21—5p在肺動脈高壓發(fā)病機(jī)制中的調(diào)控作用研究

        2016-12-27 18:05:17張洪亮董天崴張磊藝
        中國醫(yī)藥導(dǎo)報 2016年29期

        張洪亮 董天崴 張磊藝

        [摘要] 目的 研究miR-21-5p在肺動脈高壓發(fā)病中的調(diào)控機(jī)制。 方法 應(yīng)用qRT-PCR方法檢測miR-21-5p在正常人和先天性心臟病伴肺動脈高壓患者血清,以及常氧和缺氧處理肺動脈平滑肌細(xì)胞中的表達(dá);利用Edu滲入法以及劃痕實驗研究miR-21-5p對肺動脈平滑肌細(xì)胞增殖及遷移的影響;應(yīng)用Targetscan軟件進(jìn)行靶基因預(yù)測并在肺動脈平滑肌細(xì)胞中進(jìn)行驗證。 結(jié)果 肺動脈高壓患者血清miR-21-5p水平顯著高于正常人血清(P < 0.001);與常氧相比,缺氧處理肺動脈平滑肌細(xì)胞明顯促進(jìn)miR-21-5p表達(dá)(P < 0.01);miR-21-5p能夠促進(jìn)缺氧條件下的肺動脈平滑肌細(xì)胞增殖、遷移;雙熒光素酶報告系統(tǒng)證明miR-21-5p能夠結(jié)合骨形成蛋白Ⅱ型受體(BMPR2)的3UTR;鑒定miR-21-5p在肺動脈平滑肌細(xì)胞中靶向BMPR2基因。 結(jié)論 miR-21-5p調(diào)控靶基因BMPR2參與肺動脈高壓發(fā)病。

        [關(guān)鍵詞] 肺動脈高壓;microRNA;骨形成蛋白Ⅱ型受體;調(diào)控

        [中圖分類號] R543.2 [文獻(xiàn)標(biāo)識碼] A [文章編號] 1674-4721(2016)10(b)-0012-04

        [Abstract] Objective To reveal the role of miR-21-5p in the development of pulmonary arterial hypertention (PAH). Methods qRT-PCR method was used to detect the expression of miR-21-5p in the serum of healthy donors and patients with PAH associated with congenital heart disease (CHD-PAH), and the pulmonary artery smooth muscle cells (PASMC) exposed to normoxia and hypoxia. The effects of miR-21-5p on hypoxia-induced PASMC proliferation and migration were detected by Edu incorporation and wound assay. The target gene of miR-21-5p was predicted by targetscan and validated by luciferase report assay. Results miR-21-5p level was significantly increased in the serum of CHD-PAH patient as compared with healthy donors (P < 0.001). In addition, the expression of miR-21-5p was significantly induced in PASMC treated by hypoxic as compared with normoxia (P < 0.01). Functional analysis revealed that miR-21-5p significantly enhanced hypoxia-induced PASMC proliferation and migration. Finally, dual-luciferase reporter system proved miR-21-5p could integrate with BMPR2 3UTR, then BMPR2 was identified as a direct target of miR-21-5p. Conclusion The study demonstrates that miR-21-5p is involved in regulating PAH by targeting BMPR2.

        [Key words] Pulmonary arterial hypertension; microRNA; BMPR2; Regulation

        肺動脈高壓是以肺動脈壓力持續(xù)升高、肺血管阻力增加和肺小血管重構(gòu)為特征的肺血管疾病[1]。肺動脈平滑肌細(xì)胞的增殖和遷移,使得肺小動脈內(nèi)徑變細(xì),最終肺動脈阻力增加,壓力升高為其病理學(xué)特征[2-3]。

        microRNA(miRNA)是一類高度保守、長度為20~25個核苷酸的非編碼單鏈小RNA[4]。miRNA通過與靶基因mRNA 3′非翻譯區(qū)(3′-UTR)特異結(jié)合,在轉(zhuǎn)錄后水平對基因進(jìn)行調(diào)控[5]。研究表明,miRNA參與肺動脈高壓的發(fā)生發(fā)展進(jìn)程[6-7]。miRNA通過促進(jìn)肺動脈平滑肌細(xì)胞的分化和抗凋亡效應(yīng)來參與肺動脈高壓的進(jìn)程[8-9]。本研究對miR-21-5p調(diào)控BMPR2參與肺動脈高壓的發(fā)病機(jī)制進(jìn)行初步探索。

        1 材料與方法

        1.1 患者血清標(biāo)本采集

        血清標(biāo)本來源于北京阜外醫(yī)院先天性心臟病伴有肺動脈高壓(CHD-PAH)患者及健康人各24例。肺動脈高壓的診斷標(biāo)準(zhǔn)為在海平面靜息狀態(tài)下右心導(dǎo)管檢查肺動脈收縮壓>4 kPa(30 mmHg)和/或肺動脈平均壓>3.33 kPa(25 mmHg)。血液樣本在室溫下靜置1 h,4℃離心機(jī)3000 r/min離心10 min,上清液保存于-80℃冰箱。

        1.2 miR-21-5p實時熒光定量檢測

        應(yīng)用qRT-PCR檢測試劑盒(深圳盎然生物)進(jìn)行檢測。miRNA經(jīng)加poly A后立即逆轉(zhuǎn)錄反應(yīng)形成cDNA,snoRNA44作為內(nèi)參。每個樣本PCR反應(yīng)做3個復(fù)孔,引物如下:miR-21-5p 5′-GTGCAGGGTCCGAGGTCAGAGCCACCTGGGCAATTTTTTTTTTTCAACAT-3′(RT),5′-TTCGGTAGCTTACAGACTGA-3′(Forward); SNORD44:5′ -GTGCAGGGTCCGAGGTCAGAGCCACCTGGGCAATTTTTTTTTTTAGTCAG-3′(RT),5′-TGGCCTGGATGATGATAAGCA-3′ (Forward)。

        1.3 肺動脈平滑肌細(xì)胞的分離和培養(yǎng)

        人肺動脈平滑肌細(xì)胞(HPASMC)購自美國Science Cell公司,大鼠肺動脈平滑肌原代細(xì)胞(RPASMC)分離自SD大鼠[北京市維通利華實驗動物技術(shù)有限公司,合格證號:SCXK(京)2011-0011]肺動脈。

        1.4 靶基因3-UTR熒光素酶載體及其突變載體的構(gòu)建

        以大鼠的基因組DNA為模板,將pGL3-ccdb載體經(jīng)雙酶切后與基因的3-UTR產(chǎn)物連接。BMPR2的3-UTR突變引物,擴(kuò)增產(chǎn)物連接到雙酶切后的pGL3-ccdb載體,連接后轉(zhuǎn)化酶切鑒定后進(jìn)行測序分析。

        1.5 BMPR2蛋白表達(dá)檢測

        采用Western blot法進(jìn)行蛋白檢測。4%~10%的預(yù)制膠電泳分離蛋白質(zhì),經(jīng)濕轉(zhuǎn)法將蛋白轉(zhuǎn)移至硝酸纖維素膜上,一抗4℃搖床孵育過夜,用Totallab TL100圖像分析軟件對特異條帶進(jìn)行灰度掃描,并用相對灰度值表示蛋白相對含量。一抗?jié)舛确謩e為:抗BMPR2(Abcam)1∶1000,抗β-Tubulin(Santa Cruz)1∶2000;二抗?jié)舛葹?∶2000。

        1.6 細(xì)胞增殖實驗

        根據(jù)試劑盒(廣州銳博生物),接種細(xì)胞于48孔板,加入20 μmol/L EdU繼續(xù)培養(yǎng)24 h后,用4%多聚甲醛室溫固定30 min,0.5%Triton X-100透化10 min,每孔細(xì)胞加入150 μL染色反應(yīng)液反應(yīng)30 min。DNA用1×Hochest (150 μL/孔)染色5 min,在熒光顯微鏡下拍照。

        1.7 細(xì)胞遷移實驗

        細(xì)胞密度達(dá)到90%以上時進(jìn)行劃痕(每組劃3~5個位置),更換成含0.5%FBS的SmGM-2培養(yǎng)基進(jìn)行饑餓處理,并標(biāo)記和拍照,所有細(xì)胞遷移實驗重復(fù)3次。

        1.8 統(tǒng)計學(xué)方法

        采用SPSS 17.0統(tǒng)計學(xué)軟件進(jìn)行數(shù)據(jù)分析,計量資料數(shù)據(jù)用均數(shù)±標(biāo)準(zhǔn)差(x±s)表示,兩組間比較采用t檢驗;以P < 0.05為差異有統(tǒng)計學(xué)意義。

        2 結(jié)果

        2.1 miR-21-5p在CHD-PAH患者血清中及缺氧條件下肺動脈平滑細(xì)胞中的表達(dá)

        RT-PCR檢測結(jié)果顯示:miR-21-5p在CHD-PAH血清中表達(dá)升高,與正常人血清樣本比較,差異有高度統(tǒng)計學(xué)意義(P < 0.001);RPASMC和HPASMC分別在常氧條件下培養(yǎng)48 h以及缺氧條件下分別培養(yǎng)12、24、48 h,收集細(xì)胞后檢測miR-21-5p的表達(dá),結(jié)果顯示缺氧條件下miR-21-5p的表達(dá)升高最明顯,與常氧比較在24 h達(dá)到高峰值(P < 0.001)。

        2.2 miR-21-5p對人肺動脈平滑肌細(xì)胞增殖的影響

        觀察在缺氧條件下分別轉(zhuǎn)染miRNA-control、miR-21-5p mimic、anti-cnotrol、anti-miR-21-5p后對HPASMC增殖影響。從圖2(封四)結(jié)果可見,與對照組相比,過表達(dá)miR-21-5p能促進(jìn)HPASMC增殖(P < 0.01),相反,當(dāng)轉(zhuǎn)染miR-21-5p拮抗物后抑制了HPASMC增殖(P < 0.01)。

        2.3 miR-21-5p在人肺動脈平滑肌細(xì)胞遷移過程中的作用

        實驗表明,在缺氧24 h條件下miR-21-5p具有促進(jìn)HPASMC遷移作用(P < 0.01);應(yīng)用miR-21-5p抑制物缺氧24 h后,anti-21-5p抑制了HPASMC的遷移功能(P < 0.01)。

        2.4 miR-21-5p靶基因預(yù)測及3-UTR熒光素酶報告系統(tǒng)驗證

        TargetScan在線軟件預(yù)測候選靶基因中BMPR2的3-UTR與miR-21-5p結(jié)合位點(圖4A)。雙熒光素酶檢測結(jié)果顯示,過表達(dá)miR-21-5p使野生型BMPR2報告載體熒光素酶活性下降,與野生型對照組比較,差異有高度統(tǒng)計學(xué)意義(P < 0.01),突變的熒光素酶報告基因的活性與對照組比較大致不變(P > 0.05)(圖4B)。

        2.5 miR-21-5p抑制內(nèi)源性BMPR2的表達(dá)

        與對照組比較,轉(zhuǎn)染miR-21-5p mimic組中BMPR2表達(dá)水平明顯上調(diào)(P < 0.001),轉(zhuǎn)染miR-21-5p inhibitor組BMPR2表達(dá)水平明顯降低(P < 0.001)(圖5A、B)。應(yīng)用Western blot檢測BMPR2蛋白表達(dá)水平,結(jié)果顯示,與mimic-control相比,過表達(dá)miR-21-5p BMPR2蛋白表達(dá)下降;抑制miR-21-5p的表達(dá),能使HPASMC中BMPR2蛋白表達(dá)水平上調(diào)(圖5C)。

        3 討論

        既往研究證明miRNA參與肺動脈高壓的發(fā)病機(jī)制[10-11]。本研究檢測肺動脈高壓患者血清及缺氧誘導(dǎo)的肺動脈平滑肌細(xì)胞中miR-21-5p表達(dá)升高,細(xì)胞功能實驗在缺氧條件下miR-21-5p具有促進(jìn)細(xì)胞增殖和遷移功能,應(yīng)用Target scan在線軟件預(yù)測miR-21-5p靶基因為BMPR2,實驗證實miR-21-5p通過靶向BMPR2參與肺動脈高壓的細(xì)胞增殖和血管重構(gòu)過程。

        肺動脈高壓發(fā)病機(jī)制中BMPR2基因突變會引發(fā)肺動脈高壓易感性[12-13]。BMPR2是轉(zhuǎn)錄生長因子-β家族的重要成員,很早就有實驗證實BMPR2基因雜合子突變是肺動脈高壓家族患者人群的重要遺傳易感因素[14]。在肺動脈高壓患者的家族人群檢測結(jié)果顯示:大約有75%的家庭中檢測到BMPR2基因突變[15]。實驗證明,BMPR2和其下游信號途徑在肺血管重構(gòu)中扮演著重要角色,通過激活BMPR2基因阻止細(xì)胞周期從而抑制肺動脈平滑肌細(xì)胞的分化[16-17]。

        microRNA參與肺動脈高壓的調(diào)控機(jī)制已經(jīng)在多個研究中得到證實,miR-145通過靶向BMPR2參與肺動脈高壓[18],抑制miR-20a導(dǎo)致BMPR2下游基因Id-1和Id-2的激活,從而抑制肺動脈平滑肌細(xì)胞的增殖[19]。miR-21在肺動脈高壓的動物模型肺組織中高表達(dá),通過激活RhoB信號途徑促進(jìn)肺動脈高壓的發(fā)生[20]。本研究發(fā)現(xiàn)缺氧條件下,過表達(dá)miR-21-5P具有促進(jìn)肺動脈平滑肌細(xì)胞的遷移和增殖功能。說明在缺氧條件下,miR-21-5p對肺動脈的重構(gòu)過程具有重要的作用。

        本研究只探討了miR-21-5p通過BMPR2基因?qū)PASMC增殖和遷移的影響,Target scan軟件預(yù)測miR-21-5p同時靶向多個靶基因,其他靶基因是否同時參與了肺動脈高壓的調(diào)控需要下一步驗證。

        [參考文獻(xiàn)]

        [1] Leopold JA,Maron BA. Molecular Mechanisms of Pulmonary Vascular Remodeling in Pulmonary Arterial Hypertension [J]. Int J Mol Sci,2016,17(5):761-775.

        [2] Archer SL,Weir EK,Wilkins MR. Basic science of pulmonary arterial hypertension for clinicians:new concepts and experimental therapies [J]. Circulation,2010,121 (18):2045-2066.

        [3] Humbert M,Morrel NW,Archer SL,et al. Cellular and molecular pathobiology of pulmonary arterial hypertension [J]. J Am Coll Cardiol,2004,43(12):108-124.

        [4] Chen CZ,Li L,Lodish,et al. MicroRNAs modulate hematopoietic lineage differentiation [J]. Science,2004,303(56):83–86.

        [5] Bartel DP. MicroRNAs:genomics, biogenesis, mechanism, and function [J]. Cell,2004,116(2):281-297.

        [6] Dang LT,Lawson ND,F(xiàn)ish JE. MicroRNA control of vascular endothelial growth factor signaling output during vascular development [J]. Arterioscler Thromb Vasc Biol,2013,33(2):193-200.

        [7] Joshi SR,McLendon JM,Comer BS,et al. MicroRNAs-control of essential genes: Implications for pulmonary vascular disease [J]. Pulm Circ,2011,1 (3):357-364.

        [8] Brock M,Trenkmann M,Gay RE,et al. Interleukin-6 modulates the expression of the bone morphogenic protein receptor type II through a novel STAT3-microRNA cluster 17/92 pathway [J]. Circ Res,2009,104(10):1184-1191.

        [9] Jin Y,Chen B,Tipple TE,et al. Arginase II is a target of miR-17-5p and regulates miR-17-5p expression in human pulmonary artery smooth muscle cells [J]. Am J Physiol Lung Cell Mol Physiol,2014,307(2):197-204.

        [10] Caruso P,Maclean MR,Khanin R,et al. Dynamic changes in lung microRNA profiles during the development of pulmonary hypertension due to chronic hypoxia and monocrotaline [J]. Arterioscler Thromb Vasc Biol,2010, 30(4):716-723.

        [11] Zeng Y,Liu HT, Gou DM,et al. Hypoxia inducible factor-1 mediates expression of miR-322:potential role in proliferation and migration of pulmonary arterial smooth muscle cells [J].Scientific Repotrs,2015,5(3):12098-120109.

        [12] Jones PL,Cowan KN,Rabinovitch M,et al. Tenascin-C, proliferation and subendothelial fibronectin in progressive pulmonary vascular disease [J]. Am J Pathol,1997, 150(4):1349-1360.

        [13] Malenfant S,Neyron AS,Paulin R,et al. Signal transduction in the development of pulmonary arterial hypertension [J]. Pulm Circ,2013,3(2):278-293.

        [14] Deng Z,Morse JH,Slager SL,et al. Familial primary pulmonary hypertension(gene PPH1)is caused by mutations in the bone morphogenetic protein receptor-II gene [J]. Am J Hum Genet,2000,67(3):737-744.

        [15] Soubrier F,Chung WK,Machado R,et al. Genetics and genomics of pulmonary arterial hypertension [J]. J Am Coll Cardiol,2013,62(25):13-21.

        [16] Wang J,Song Y,Zhang Y,et al. Cardiomyocyte overexpression of miR-27b induces cardiac hypertrophy and dysfunction in mice [J]. Cell Res,2012,22(3):516-527.

        [17] Yang J,Li X,AlLamki RS,et al. Smad-dependent and smad-independent induction of id1 by prostacyclin analogues inhibits proliferation of pulmonary artery smooth muscle cells in vitro and in vivo [J]. Circ Res,2010, 107(2):252-262.

        [18] Caruso P,Dempsie Y,Stevens HC,et al. A Role for miR-145 in Pulmonary Arterial Hypertension:Evidence From Mouse Models and Patient Samples[J]. Circ Res,2012,111(3):290-300.

        [19] Brock M,Samillan VJ,Trenkmann M,et al. AntagomiR directed against miR-20a restores functional BMPR2 signalling and prevents vascular remodelling in hypoxia-induced pulmonary hypertension [J]. European Heart Journal,2014,35(45):3203-3211.

        [20] Parikh VN,Jin RC,Rabello S,et al. MicroRNA-21 Integrates Pathogenic Signaling to Control Pulmonary Hypertension: Results of a Network Bioinformatics Approach [J]. Circulation,2012,125(12):1520-1532.

        (收稿日期:2016-07-13 本文編輯:程 銘)

        精品少妇一区二区三区四区| 国产熟妇人妻精品一区二区动漫| 亚洲一区二区三区日本久久九| 色yeye在线观看| 国产伦奸在线播放免费| 免费a级毛片无码a∨蜜芽试看| 国产卡一卡二卡三| 无码毛片高潮一级一免费| 亚洲图文一区二区三区四区| 麻豆91蜜桃传媒在线观看| 91九色视频在线国产| 亚洲av综合色区| 亚洲男人天堂| 2021最新久久久视精品爱| 国产视频激情视频在线观看| 成人亚洲精品777777| 精品国产三级a在线观看| 日本啪啪一区二区三区| 一区二区三区日本伦理| 国产三级久久久精品麻豆三级| 国产99r视频精品免费观看| 久久免费网站91色网站| 亚洲国产av一区二区三区精品| 蜜桃视频无码区在线观看| 久草午夜视频| 久久精品国产亚洲av试看| 免费人成在线观看视频高潮| 真人与拘做受免费视频| 啪啪网站免费观看| 精品私密av一区二区三区| 樱桃视频影院在线播放| 男女真实有遮挡xx00动态图 | 亚洲热妇无码av在线播放| 成年人一区二区三区在线观看视频| 人成视频在线观看免费播放| 99久久人妻无码精品系列蜜桃 | 成人激情视频一区二区三区| 久久久久高潮综合影院| 成年人干逼视频水好多| 亚洲一区二区三区少妇| 亚洲综合精品一区二区|