李 蕊
(西安外事學(xué)院醫(yī)學(xué)院,西安 710077)
PHB對高糖環(huán)境下的心肌細(xì)胞中活性氧及細(xì)胞凋亡的影響及機(jī)制研究①
李 蕊
(西安外事學(xué)院醫(yī)學(xué)院,西安 710077)
目的探討抗增殖蛋白(PHB)對高糖誘導(dǎo)的H9C2心肌細(xì)胞凋亡的影響以及機(jī)制研究。方法選取pCDNA3-PHB、pCDNA3-NC重組質(zhì)粒轉(zhuǎn)染和高糖干預(yù)心肌細(xì)胞,實驗分為4組:正常對照組(Control組)、高糖刺激組(HG組)、高糖+空載體組(HG+pCDNA3-NC組)、高糖加pCDNA3-PHB重組質(zhì)粒組(HG+pCDNA3-PHB);Western blot檢測細(xì)胞轉(zhuǎn)染后各組細(xì)胞中PHB蛋白、B細(xì)胞淋巴瘤/白血病-2 相關(guān)X 蛋白(Bax)/B 細(xì)胞淋巴瘤/白血病-2(Bcl-2)、剪切的半胱氨酸的天冬氨酸蛋白水解酶-3(c-caspase3)、蛋白激酶B(AKt)、磷酸化蛋白激酶B(p-AKt)蛋白的表達(dá)量,二氫乙啶(DHE)染色法檢測高糖環(huán)境下心肌細(xì)胞內(nèi)的活性氧(ROS)水平,實時熒光定量PCR(qRT-PCR)檢測細(xì)胞中TNF-α mRNA和IL-6 mRNA含量的測定 ,流式細(xì)胞儀檢測細(xì)胞的凋亡率。結(jié)果pCDNA3-PHB重組質(zhì)??墒筆HB表達(dá)量增加;與Control組相比,HG組、HG+pCDNA3-NC組、HG+pCDNA3-PHB組細(xì)胞凋亡率顯著增高(P<0.05);與HG組相比,HG+pCDNA3-NC組細(xì)胞凋亡率變化不顯著(P>0.05);HG+pCDNA3-PHB組細(xì)胞凋亡率明顯降低(P<0.05)。與Control組相比,HG組、HG+pCDNA3-NC組、HG+pCDNA3-PHB組細(xì)胞內(nèi)ROS的水平、TNF-α mRNA、IL-6 mRNA、Bax/Bcl-2的相對表達(dá)量、c-caspase3(P<0.05)蛋白相對表達(dá)量顯著增高;與HG組相比,HG+pCDNA3-NC組細(xì)胞內(nèi)ROS的水平(P>0.05)、TNF-α mRNA(P<0.05)、IL-6 mRNA(P<0.05)、Bax/Bcl-2的相對表達(dá)量(P>0.05)、c-caspase3蛋白相對表達(dá)量(P>0.05)無明顯差異;但pCDNA3-PHB組細(xì)胞中ROS的水平(P<0.05)、TNF-α mRNA(P<0.05)、IL-6 mRNA(P<0.05)、Bax/Bcl-2的相對表達(dá)量(P<0.05)、c-caspase3(P<0.05)蛋白相對表達(dá)量明顯降低。經(jīng)統(tǒng)計分析顯示,各組細(xì)胞中AKt蛋白的相對表達(dá)量無顯著差異(P>0.05)。經(jīng)比較后,HG組、HG+pCDNA3-NC組、HG+pCDNA3-PHB組心肌細(xì)胞中p-AKt蛋白的相對表達(dá)量顯著低于Control組(P<0.05);HG+pCDNA3-NC組心肌細(xì)胞中p-AKt蛋白的相對表達(dá)量與HG組間無顯著差異(P>0.05);但HG+pCDNA3-PHB組心肌細(xì)胞中p-AKt蛋白的相對表達(dá)量明顯高于HG組(P<0.05)。結(jié)論P(yáng)HB過表達(dá)可抑制高糖環(huán)境下H9C2心肌細(xì)胞的凋亡和炎癥反應(yīng),主要是通過調(diào)控PI3K/Akt信號通路、ROS、Bax/Bcl-2、c-caspase3蛋白的水平,為糖尿病心肌病的治療提供新的思路與方法。
PHB;心肌細(xì)胞;ROS;Bax/Bcl-2;c-caspase3;Akt
近年來,機(jī)體自身代謝紊亂逐漸成為影響人類健康的慢性疾病之一,其中以糖尿病最為嚴(yán)重[1,2]。若機(jī)體長期發(fā)生糖代謝異常會引起各種并發(fā)癥,且死亡率極高[3]。糖尿病心肌病(Diabetic cardiomyopathy,DCM)是糖尿病患者常見的并發(fā)癥,主要是由于高糖環(huán)境下導(dǎo)致心肌細(xì)胞受到損傷而導(dǎo)致的增殖、凋亡機(jī)制異常,最終引起心臟功能障礙的一種疾病。糖脂代謝紊亂和氧化應(yīng)激可能是引起糖尿病心肌病的重要原因[4]??乖鲋车鞍?Prohibitin,PHB)普遍存在于線粒體內(nèi)膜上,是進(jìn)化中具有高度保守性的蛋白[5]。據(jù)研究PHB在細(xì)胞代謝、生長、凋亡以及糖尿病等多方面發(fā)揮重要作用[6,7]。PHB發(fā)揮作用主要通過與轉(zhuǎn)錄抑制復(fù)合物和線粒體抗凋亡蛋白相互作用從而調(diào)控細(xì)胞的凋亡[8]。但PHB對糖尿病心肌細(xì)胞功能的影響以及作用機(jī)制尚不完全清楚。因此本實驗通過體外模擬糖尿病心肌細(xì)胞的高糖狀態(tài)研究PHB對H9C2心肌細(xì)胞凋亡的影響以及作用機(jī)制,以期為糖尿病心肌病治療提供新的思路。
1.1材料 H9C2心肌細(xì)胞購自北京北納生物技術(shù)有限公司,胎牛血清(FBS)、胰蛋白酶購自美國Gibco公司;CCK-8檢測試劑盒購自江蘇凱基生物技術(shù)股份有限公司;抗體均購自英國Abcam公司;pCDNA3-PHB過表達(dá)載體購自吉滿生物科技(上海)有限公司;Lipofectamine 2000轉(zhuǎn)染試劑盒購自美國Invitrogen 公司;DHE檢測試劑盒購自上海碧云天生物技術(shù)研究所;細(xì)胞培養(yǎng):H9C2心肌細(xì)胞在5%CO2、37℃的恒溫培養(yǎng)箱中培養(yǎng),待細(xì)胞貼壁后,0.25%胰酶消化,更換新的培養(yǎng)基繼續(xù)培養(yǎng),每2~3 d更換新的培養(yǎng)基。
1.2方法
1.2.1細(xì)胞轉(zhuǎn)染及干預(yù) 細(xì)胞轉(zhuǎn)染:取對數(shù)生長的H9C2心肌細(xì)胞胰酶消化后以5×104個/孔細(xì)胞接種于六孔板中培養(yǎng),待細(xì)胞融合度達(dá)到80%左右時,棄去培養(yǎng)基,PBS清洗,每孔加入10 μl脂質(zhì)體Lipofectamine 2000,室溫靜置5 min,pCDNA3-PHB組加入pCDNA3-PHB重組質(zhì)粒,pCDNA3-NC組加入空載體,Normal組為未作處理的細(xì)胞,以β-actin為內(nèi)參,Western blot 檢測PHB蛋白的相對表達(dá)量。
以高糖對細(xì)胞進(jìn)行干預(yù):實驗分為4組:正常對照組(Control組)、高糖刺激組(HG組)、高糖+空載體組(HG+pCDNA3-NC組)、高糖加pCDNA3-PHB重組質(zhì)粒組(HG+pCDNA3-PHB)。
1.2.2高糖環(huán)境下心肌細(xì)胞中活性氧的測定 使用二氫乙啶(Dihydroethidium,DHE)染色法檢測H9C2心肌細(xì)胞活性氧的表達(dá)情況。取高糖刺激48 h的心肌細(xì)胞置于六孔板中,加入DHE、DMEM細(xì)胞培養(yǎng)基,放入37℃恒溫箱中避光培養(yǎng)30 min,然后緩沖液沖洗3次,熒光顯微鏡下檢測活性氧的水平。
1.2.3流式細(xì)胞儀檢測心肌細(xì)胞的凋亡率 取各組H9C2心肌細(xì)胞,胰酶消化,使細(xì)胞的濃度為1×106個/ml,1 000 r/min離心5 min后棄去上清,緩沖液清洗3次,加入5 μl Annexin V-FITC/PI,流式細(xì)胞儀檢測細(xì)胞的凋亡情況。
1.2.4Western blot檢測Bax/Bcl-2、c-caspase3、AKt、p-AKt蛋白表達(dá)量 取各組細(xì)胞置于EP管中,每管加入300 μl蛋白裂解液,12 000 r/min離心10 min,加入5×SDS上樣緩沖液,沸水煮10 min左右,BCA法測定提取的蛋白質(zhì)濃度。10% SDS-PAGE電泳后轉(zhuǎn)移至PVDF上,5%的脫脂牛奶封閉30 min,加入一抗孵育過夜后TBST清洗3遍,加入二抗孵育 2 h,滴加電化學(xué)發(fā)光顯色液測定灰度值,與內(nèi)參β-actin的灰度值的比值表示目的蛋白的相對表達(dá)量。
1.2.5實時熒光定量PCR(qRT-PCR)檢測細(xì)胞中TNF-α mRNA和IL-6 mRNA含量的測定 按照細(xì)胞提取RNA試劑盒說明書進(jìn)行操作,提取細(xì)胞中的總RNA,瓊脂糖凝膠電泳和紫外分光光度計檢測細(xì)胞完整性和純度,調(diào)整RNA濃度,-80℃保存。采用反轉(zhuǎn)錄試劑盒將所提取的RNA進(jìn)行反轉(zhuǎn)錄。根據(jù)Gene bank上IL-1β和IL-6的序列設(shè)計PCR引物,TNF-α的引物上游序列為5-CATTCCTGCTCGTGGCGGGG-3,下游序列為5-CGACGTGGGCTACG-GGCTTG-3,IL-6的引物上游序列為5-GTCTCGAGC-CCACCAGGAACG-3,下游序列為5-AGGGAAGGCAGTGGCTGTCAAC-3。定量PCR的反應(yīng)程序為預(yù)變性94℃ 3 min;變性94℃ 30 s,退火50℃ 30 s,延伸72℃ 30 s,40 cycle,終延伸72℃ 5 min ,以cDNA為模板,GAPDH為內(nèi)參,實驗重復(fù)3次,取其平均數(shù),用2-ΔΔCt法計算各組mRNA的表達(dá)量。
2.1Western blot檢測PHB蛋白的表達(dá)量 Western blot檢測細(xì)胞轉(zhuǎn)染pCDNA3-PHB和空載質(zhì)粒后PHB蛋白的表達(dá)水平。如圖1、表1所示,pCDNA3-PHB組、pCDNA3-NC組、Normal組蛋白的相對表達(dá)量分別為(1.625±0.249)、(0.762±0.094)、(0.813±0.096);與Normal組相比,pCDNA3-PHB組心肌細(xì)胞中PHB蛋白的相對表達(dá)量明顯增高,具有統(tǒng)計學(xué)意義(P<0.05),pCDNA3-NC組和Normal組間差異不明顯(P>0.05)。
圖1 轉(zhuǎn)染后H9C2心肌細(xì)胞中PHB蛋白的相對表達(dá)量Fig.1 Relative expression of PHB protein in transfected H9C2 cellsNote: 1.Normal group;2.pCDNA3-NC group;3.pCDNA3-PHB group.
GroupsPHBrelativeexpressionNormal0.813±0.096pCDNA3-NC0.762±0.094pCDNA3-PHB1.625±0.2491)
Note:Compared with normal group,1)P<0.05.
2.2PHB對高糖環(huán)境下心肌細(xì)胞中活性氧的影響 二氫乙啶(Dihydroethidium,DHE)染色高糖環(huán)境下心肌細(xì)胞內(nèi)的ROS水平,可通過流式細(xì)胞術(shù)檢測反映,見圖2。如表2所示,Control組中ROS的值為(0.998±0.036),HG組、HG+pCDNA3-NC組、HG+pCDNA3-PHB組的相對值分別為(4.013±0.365)、(4.168±0.401)、(1.963±0.124);經(jīng)統(tǒng)計分析,HG組、HG+pCDNA3-NC組、HG+pCDNA3-PHB組細(xì)胞內(nèi)ROS的水平明顯高于Control對照組,差異具有統(tǒng)計學(xué)意義(P<0.05);HG+pCDNA3-PHB組細(xì)胞內(nèi)ROS的水平顯著低于HG組、HG+pCDNA3-NC組(P<0.05)。
2.3PHB對高糖環(huán)境下的心肌細(xì)胞的凋亡率的影響 流式細(xì)胞術(shù)檢測PHB過表達(dá)對高糖環(huán)境下的H9C2心肌細(xì)胞凋亡率的影響。結(jié)果如圖3、表3所示,Control組、HG組、HG+pCDNA3-NC組、HG+pCDNA3-PHB組細(xì)胞的凋亡率分別為(8.132±0.561)%、(25.385±2.487)%、(26.159±2.169)%、(16.487±1.952)%;與Control組相比,HG組、HG+pCDNA3-NC組、HG+pCDNA3-PHB組心肌細(xì)胞的凋亡指數(shù)顯著增高(P<0.05);與HG+pCDNA3-NC組相比,HG+pCDNA3-PHB組心肌細(xì)胞的凋亡率明顯降低(P<0.05);與HG組相比,HG+pCDNA3-NC組心肌細(xì)胞凋亡率沒有顯著差異(P>0.05),HG+pCDNA3- PHB組可顯著降低心肌細(xì)胞的凋亡率(P<0.05)。
圖2 PHB對高糖環(huán)境下心肌細(xì)胞活性氧(ROS)的影響Fig.2 Effect of PHB to cardiomyocytes reactive oxygen species(ROS) under high glucoseNote: A.Control group;B.HG group;C.HG+pCDNA3-NC group;D.HG+pCDNA3-PHB group.
2.4PHB對高糖環(huán)境下的心肌細(xì)胞中Bax/Bcl-2、c-caspase3、AKt、p-AKt蛋白表達(dá)量的影響 結(jié)果如圖4、表4所示,Control組、HG組、HG+pCDNA3-NC組、HG+pCDNA3-PHB組細(xì)胞中Bax/Bcl-2的相對表達(dá)量分別為(0.462±0.048)、(1.698±0.459)、(1.586±0.874)、(0.823±0.091);剪切的c-caspase3蛋白的相對表達(dá)量分別為(0.985±0.084)、(2.456±0.358)、(2.511±0.478)、(1.652±0.625);蛋白激酶B(AKt)蛋白的相對表達(dá)量分別為(0.991±0.074)、(0.982±0.083)、(0.987±0.086)、(0.979±0.085);磷酸化AKt(p-AKt)蛋白的相對表達(dá)量分別為(2.783±0.464)、(0.974±0.079)、(0.989±0.084)、(1.578±0.365);與Control組相比,HG組、
GroupsROSrelativevalueControl0.998±0.036HG4.013±0.3651)HG+pCDNA3-NC4.168±0.4011)HG+pCDNA3-PHB1.963±0.124
Note:Compared with control group,1)P<0.05.
GroupsApoptoticrateofcardiomyocytes(%)Control8.132±0.561HG25.385±2.4871)HG+pCDNA3-NC26.159±2.1691)HG+pCDNA3-PHB16.487±1.952
Note:Compared with control group,1)P<0.05.
HG+pCDNA3-NC組、HG+pCDNA3-PHB組細(xì)胞中Bax/Bcl-2(P<0.05)、c-caspase3(P<0.05)的相對表達(dá)量顯著增加,p-AKt蛋白的相對表達(dá)量顯著降低(P<0.05);與HG組相比,HG+pCDNA3-NC組心肌細(xì)胞中Bax/Bcl-2、c-caspase3、p-AKt蛋白的相對表達(dá)量差異沒有顯著統(tǒng)計學(xué)意義(P>0.05),但HG+pCDNA3-PHB組細(xì)胞中Bax/Bcl-2和c-caspase3蛋白的相對表達(dá)量顯著降低(P<0.05),p-AKt表達(dá)明顯升高。
2.5qRT-PCR檢測細(xì)胞中TNF-α mRNA和IL-6 mRNA含量的測定 結(jié)果如表5所示,Control組、HG組、HG+pCDNA3-NC組、HG+pCDNA3-PHB組細(xì)胞的TNF-α mRNA為(2.623±0.286)、(5.592±0.550)、(5.650±0.591)、(3.672±0.344);IL-6mRNA為(1.877±0.262)、(4.156±0.480)、(4.298±0.552)、(3.112±0.421)。與Control組相比,HG組、HG+pCDNA3-NC組、HG+pCDNA3-PHB組心肌細(xì)胞的TNF-α mRNA、IL-6 mRNA顯著增高(P<0.05);與HG組相比,HG+pCDNA3-NC組心肌細(xì)胞中TNF-α mRNA、IL-6 mRNA沒有顯著差異(P>0.05),HG+pCDNA3-PHB組可顯著降低心肌細(xì)胞中TNF-α mRNA、IL-6 mRNA的表達(dá)量(P<0.05)。
圖3 PHB對高糖環(huán)境下心肌細(xì)胞凋亡率的影響Fig.3 Effect of PHB to cardiomyocytes apoptosis rate under high glucoseNote: A.Control group;B.HG group;C.HG+pCDNA3-NC group;D.HG+pCDNA3-PHB group.
GroupsProteinrelativeexpressionBax/Bcl-2c-caspase3AKtp-AKtControl0.462±0.0480.985±0.0840.991±0.0742.783±0.464HG1.698±0.4591)2.456±0.3581)0.982±0.0830.974±0.0791)HG+pCDNA3-NC1.586±0.8741)2.511±0.4781)0.987±0.0860.989±0.0841)HG+pCDNA3-PHB0.823±0.0911.652±0.6250.979±0.0851.578±0.365
Note:Compared with control group,1)P<0.05.
圖4 Western blot檢測心肌細(xì)胞Bax/Bcl-2、c-caspase3、AKt、p-AKt蛋白表達(dá)量Fig.4 Expression of Bax/Bcl-2,c-caspase3,AKt and p-AKt protein in cardiomyocytes by Western blotNote: 1.Control group;2.HG group;3.HG+pCDNA3-NC group;4.HG+pCDNA3-PHB group.
GroupsTNF-αIL-6Control2.623±0.2861.877±0.262HG5.592±0.5501)4.156±0.4801)HG+pCDNA3-NC5.650±0.5911)4.298±0.5521)HG+pCDNA3-PHB3.672±0.3443.112±0.421
Note:Compared with Control group,1)P<0.05.
PHB屬于細(xì)胞膜蛋白超家族蛋白之一,在正常人體細(xì)胞中廣泛存在,發(fā)揮多種作用,是一種進(jìn)化保守、表達(dá)廣泛的基因。研究顯示,PHB在細(xì)胞的能量代謝、增殖、凋亡等過程中發(fā)揮重要作用[9,10]。PHB是常見的分子伴侶,可以通過抑制丙酮酸羧化酶的作用,調(diào)控細(xì)胞新陳代謝[11]。研究發(fā)現(xiàn),PHB過表達(dá)可調(diào)節(jié)新陳代謝的氧化磷酸化轉(zhuǎn)化為無氧酵解,降低糖分解,從而改善體內(nèi)糖代謝[12]。PHB可作用于細(xì)胞周期中重要的轉(zhuǎn)錄因子E2F從而抑制細(xì)胞的增殖[13]。同時PHB還可與多種抗凋亡因子結(jié)合從而調(diào)控細(xì)胞的凋亡[11]。成年心肌細(xì)胞屬于非再生型細(xì)胞,無增殖能力,細(xì)胞若長期受損或者凋亡將會導(dǎo)致心肌細(xì)胞丟失,嚴(yán)重影響心室的收縮與舒張功能,是心臟功能障礙的重要原因之一。本實驗發(fā)現(xiàn)高糖環(huán)境可誘導(dǎo)心肌細(xì)胞的凋亡,但PHB過表達(dá)后拮抗高糖促進(jìn)凋亡細(xì)胞的作用,說明PHB的表達(dá)量在一定程度上抑制糖尿病心肌細(xì)胞的凋亡,有助于緩解糖尿病心肌病的惡化。
活性氧(ROS)是機(jī)體受到刺激時產(chǎn)生的一組不穩(wěn)定、含氧的活性分子化合物的統(tǒng)稱,具有較高的化學(xué)活性,對生物體以及細(xì)胞的生理活動起重要的調(diào)節(jié)作用。當(dāng)機(jī)體處于生理狀態(tài)下且無外界刺激時,ROS的分泌量較少,對調(diào)節(jié)細(xì)胞穩(wěn)態(tài)、免疫、信號轉(zhuǎn)導(dǎo)等生理過程有重要作用。有研究證明當(dāng)機(jī)體處于病理狀態(tài)下或者受到某些因素的刺激下,ROS的分泌量增多,可與細(xì)胞內(nèi)蛋白質(zhì)、細(xì)胞器、DNA等分子相互作用,引起細(xì)胞結(jié)構(gòu)和功能障礙,最終導(dǎo)致心肌細(xì)胞受到損傷或者促進(jìn)其凋亡,從而誘導(dǎo)疾病的產(chǎn)生[14]。Fiorini等[15]的研究報道指出高濃度的ROS和抗氧化損傷防御系統(tǒng)的缺陷可促進(jìn)細(xì)胞凋亡,這為藥物誘導(dǎo)ROS的生成治療疾病提供了理論依據(jù)。據(jù)報道ROS可通過介導(dǎo)氧化應(yīng)激反應(yīng)調(diào)節(jié)心肌細(xì)胞的凋亡過程[16]。TNF-α 和IL-6是重要的炎癥介質(zhì),促進(jìn)細(xì)胞增殖和分化,并參與某些自身免疫病的病理損傷。本實驗結(jié)果顯示,高糖環(huán)境可誘導(dǎo)H9C2心肌細(xì)胞中的ROS、TNF-α 、IL-6的生成增多,但PHB過表達(dá)可以改善高糖環(huán)境下ROS、TNF-α 、IL-6的生成,說明PHB可通過調(diào)節(jié)細(xì)胞體內(nèi)的ROS、TNF-α 、IL-6的生成從而影響心肌細(xì)胞的凋亡率,但具體的作用機(jī)制還不完全清楚。
Bax和 Bcl-2是調(diào)控細(xì)胞凋亡過程的重要因子,位于細(xì)胞質(zhì)中,其中Bax促進(jìn)細(xì)胞的凋亡,Bcl-2抑制細(xì)胞的凋亡。當(dāng)細(xì)胞受到損傷時,細(xì)胞內(nèi)信號轉(zhuǎn)導(dǎo)途徑被激活引起促凋亡蛋白Bax的活性,使線粒體膜的通透性增加,大量細(xì)胞色素C穿過膜組織進(jìn)入細(xì)胞質(zhì),激活細(xì)胞凋亡途徑,促進(jìn)細(xì)胞凋亡[17]。但當(dāng)Bax活性增強(qiáng)時,Bcl-2可與其形成異源二聚體減少線粒體膜的通透性,抑制Bax的促凋亡作用[18]。因此二者的比例對細(xì)胞凋亡途徑起到重要作用。c-caspase3是細(xì)胞凋亡途徑的核心蛋白酶,在各種凋亡程序中發(fā)揮關(guān)鍵性作用[19]。根據(jù)多方研究表明機(jī)體異常狀態(tài)下激活磷脂酰肌醇-3-激酶-蛋白激酶B(PI3K/Akt)信號通路[20,21],調(diào)節(jié)其下游的多種效應(yīng)分子從而促進(jìn)細(xì)胞的凋亡。本實驗結(jié)果顯示高糖環(huán)境下心肌細(xì)胞中Bax蛋白、c-caspase3蛋白的表達(dá)量增加,Bcl-2蛋白、p-AKt蛋白的表達(dá)量降低;PHB可通過調(diào)節(jié)高糖環(huán)境下心肌細(xì)胞中Bax/Bcl-2的比值和PI3K/Akt信號通路,降低c-caspase3蛋白的相對表達(dá)量,降低細(xì)胞的凋亡率。
綜上所述,PHB過表達(dá)通過調(diào)控PI3K/Akt信號通路、ROS、Bax/Bcl-2、c-caspase3的表達(dá)量,抑制炎癥反應(yīng),降低心肌細(xì)胞凋亡率,防止DCM進(jìn)一步惡化,為DCM治療新方法的創(chuàng)建提供理論依據(jù)。
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StudyeffectsandmechanismofPHBonreactiveoxygenspeciesandapoptosisincardiomyocytesunderhighglucose
LIRui.
Xi′anExternalAffairsInstituteSchoolofMedicine,Xi′an710077,China
Objective:To investigate the effect and mechanism of PHB on the apoptosis of H9C2 cardiomyocytes under high glucose.MethodsSelect pCDNA3-PHB and pCDNA3-NC recombinant plasmid transfect into cardiomyocytes and effected by high glucose.The experiment were divided into four groups:control group,high glucose group(HG group),high glucose+ empty vector group(HG+ pCDNA3-NC group),high glucose+ pCDNA3-PHB plasmid group(HG+ pCDNA3-PHB group).The expression of PHB,Bax/Bcl-2,c-caspase3,AKt and p-AKt protein after transfected were detected by Western blot.ROS were detected under high glucose by DHE staining.The TNF-α mRNA and IL-6 mRNA were detected by Real-time quantitative PCR(qRT-PCR).Flow cytometry was used to detect the apoptotic rate.ResultsThe recombinant plasmid pCDNA3-PHB could increase the expression of PHB.The apoptotic rate of HG group,HG+ pCDNA3-NC group and HG+ pCDNA3-PHB group were significantly higher than control group(P<0.05).Compared with HG group,the apoptotic rate of HG+ pCDNA3-NC group was not significant(P> 0.05),but that of HG+ pCDNA3-PHB group was significantly lower(P<0.05).The levels of ROS,TNF-α mRNA,IL-6 mRNA,Bax/Bcl-2 and c-caspase3(P<0.05) protein in the HG group,HG+ pCDNA3-NC group,HG+ pCDNA3-PHB group were significantly higher than the control group.Compared with HG group,the level of ROS,TNF-α mRNA,IL-6 mRNA,Bax/Bcl-2 and c-caspase3 (P>0.05)protein in the HG+ pCDNA3-NC group were no significant difference,but the ROS,TNF-α mRNA,IL-6 mRNA、Bax/Bcl-2 and c-caspase3 (P<0.05)protein in the HG+ pCDNA3-PHB group were significantly decreased.Statistical analysis showed that there was no significant difference of AKt protein in each group(P> 0.05).The relative expression of p-AKt protein in HG group,HG+ pCDNA3-NC group and HG+ pCDNA3-PHB group were significantly lower than that in control group(P<0.05),HG+ pCDNA3-NC group was no significantly different than HG group(P> 0.05),However,HG+ pCDNA3-PHB group was significantly higher than HG group(P<0.05).ConclusionPHB overexpression can inhibit the apoptosis of H9C2 cardiomyocytes in high glucose environment,andreduce the inflammatory response by effected the regulation of PI3K/Akt signaling pathway,reduced ROS,Bax/Bcl-2,c-caspase3 protein levels,that give us a new ideas and methods of DCM.
PHB;Cardiomyocytes;ROS;Bax/Bcl-2;c-caspase3;Akt
10.3969/j.issn.1000-484X.2017.12.007
R329.2
A
1000-484X(2017)12-1789-06
①本文受陜西省科技廳社會發(fā)展公關(guān)項目(2016SF-220)資助。
李 蕊(1982年-),女,碩士,副教授,主要從事慢性病防治方面的研究,E-mail:alaalachong@163.com。
[收稿2017-07-14]
(編輯 許四平 劉格格)