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WNK3激酶高表達(dá)對(duì)白介素-1β誘導(dǎo)HEK293細(xì)胞凋亡的保護(hù)作用

2016-04-06 02:11王德選葉曉華余靈芳林洪洲莊捷秋楊青鄭雯潔
關(guān)鍵詞:激酶培養(yǎng)液腎臟

王德選,葉曉華,余靈芳,林洪洲,莊捷秋,楊青,鄭雯潔

(溫州醫(yī)科大學(xué)附屬第二醫(yī)院育英兒童醫(yī)院 小兒腎內(nèi)科,浙江 溫州 325027)

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WNK3激酶高表達(dá)對(duì)白介素-1β誘導(dǎo)HEK293細(xì)胞凋亡的保護(hù)作用

王德選,葉曉華,余靈芳,林洪洲,莊捷秋,楊青,鄭雯潔

(溫州醫(yī)科大學(xué)附屬第二醫(yī)院育英兒童醫(yī)院 小兒腎內(nèi)科,浙江 溫州 325027)

[摘 要]目的:觀察WNK3激酶高表達(dá)對(duì)白介素-1β(IL-1β)誘導(dǎo)人胚腎細(xì)胞(HEK293細(xì)胞)凋亡的作用。方法:HEK293細(xì)胞分為3組:Vector+NS組、Vector+IL-1β組和WNK3+IL-1β組。Vector+NS組、Vector+IL-1β組轉(zhuǎn)染對(duì)照Vector,WNK3+IL-1β組轉(zhuǎn)染W(wǎng)NK3。藥物干預(yù)時(shí),Vector+NS組加入等量0.9%氯化鈉溶液,Vector+IL-1β組、WNK3+IL-1β組加入10 ng/mL IL-1β。分別于培養(yǎng)0、12、24、36和48 h時(shí),采用CCK-8試劑盒檢測(cè)細(xì)胞活性。孵育0、18、36 h時(shí)應(yīng)用Western blot法檢測(cè)Caspase-3、cleaved Caspase-3、Caspase-9、cleaved Caspase-9等凋亡蛋白。在IL-1β干預(yù)0、30、60 min時(shí)采用Western blot法檢測(cè)JNK通路蛋白。結(jié)果:Vector+IL-1β組在給藥后細(xì)胞活性逐漸下降,在48 h達(dá)到最低值,WNK3+IL-1β組下降幅度較緩和,與同時(shí)間點(diǎn)Vector+IL-1β組比較細(xì)胞活性回升,在48 h時(shí)差異有統(tǒng)計(jì)學(xué)意義(P<0.01)。IL-1β孵育后cleaved Caspase-3和cleaved Caspase-9表達(dá)量增加。與36 h的Vector+IL-1β組比較,WNK3+IL-1β組的cleaved Caspase-3顯著減少,2組的cleaved Caspase-9在18 h及36 h時(shí)差異亦存在統(tǒng)計(jì)學(xué)意義(P<0.05)。WNK3轉(zhuǎn)染后p-JNK的表達(dá)水平較未轉(zhuǎn)染W(wǎng)NK3組的上升幅度降低(P<0.05)。結(jié)論:IL-1β誘導(dǎo)HEK293細(xì)胞活性下降,而轉(zhuǎn)染W(wǎng)NK3質(zhì)??梢杂行孓D(zhuǎn)部分細(xì)胞活性。WNK3激酶通過減少JNK的磷酸化抑制Caspase途徑的活化,減少細(xì)胞凋亡,起到在不利條件下保護(hù)腎臟細(xì)胞的作用。

[關(guān)鍵詞]WNK3;JNK;白介素-1β;腎臟;凋亡

腎臟是維持水和電解質(zhì)平衡的重要臟器,但也極易受到缺血低氧、藥物等各種因素的影響,進(jìn)而引起腎臟不同細(xì)胞的功能受損,甚至細(xì)胞凋亡或壞死。WNKs激酶[with no lysis(K)kinase]是一種新型絲氨酸/蘇氨酸蛋白激酶家族。研究提示W(wǎng)NKs激酶構(gòu)成了一些新的信號(hào)通路,涉及人體各種離子轉(zhuǎn)運(yùn)體和通道的調(diào)節(jié)[1]。WNK3激酶是WNKs 4個(gè)家族成員之一,可在細(xì)胞水平上調(diào)節(jié)鈉氯共轉(zhuǎn)運(yùn)子(Na+-Cl--contransporter,NCC)的表達(dá),而腎臟的NCC主要分布于遠(yuǎn)曲小管,是腎小管重吸收鈉離子的通道蛋白之一[2]。目前國內(nèi)外研究[3-4]多傾向于抑制WNK3激酶,進(jìn)而減少腎臟對(duì)鈉離子的吸收,以達(dá)到控制高血壓的目的。但也有研究[5-6]顯示W(wǎng)NK3激酶可能對(duì)某些細(xì)胞的凋亡有一定的保護(hù)作用,如子宮頸癌細(xì)胞、神經(jīng)細(xì)胞元細(xì)胞等,因此,過度抑制WNK3激酶表達(dá)可能會(huì)帶來一些負(fù)效應(yīng)。WNK3激酶對(duì)人腎臟細(xì)胞的凋亡有無保護(hù)作用,目前鮮見相關(guān)報(bào)道。本研究主要觀察WNK3對(duì)白介素-1β(IL-1β)誘導(dǎo)HEK293細(xì)胞凋亡的影響。

1 材料和方法

1.1材料 HEK293細(xì)胞(人胚腎細(xì)胞)為上海長(zhǎng)征醫(yī)院梅長(zhǎng)林教授惠贈(zèng)。空白對(duì)照質(zhì)粒pCMV-HAVector、重組實(shí)驗(yàn)質(zhì)粒pCMV-HA-WNK3均由美國EMORY大學(xué)腎內(nèi)科蔡暉教授惠贈(zèng)。IL-1β(recombinant human IL-1beta,200-01B)購自Peprotech。CCK-8分析試劑盒購于日本Dojindo Laboratories。Caspase-9(可同時(shí)檢測(cè)cleaved Caspase-9)、Caspase-3、cleaved Caspase-3抗體、p-JNK、t-JNK等抗體均為美國Cell Signal Technology產(chǎn)品。羊抗兔和羊抗鼠二抗購自美國Jackson ImmunoResearch。DMEM、OPTI-MEM培養(yǎng)基為美國Gibco公司產(chǎn)品。胎牛血清購自杭州四季青公司。Lipofectamine 2000為Invitrogen公司產(chǎn)品。其余試劑均為市售分析純。

1.2CCK-8法檢測(cè)不同干預(yù)條件下HEK293細(xì)胞活性

1.2.1細(xì)胞培養(yǎng):HEK293細(xì)胞接種于培養(yǎng)皿中,在含10%胎牛血清、100 U/mL青霉素和100 μg/mL鏈霉素的DMEM培養(yǎng)液中傳代培養(yǎng)。細(xì)胞培養(yǎng)箱條件為37 ℃,5% CO2及飽和濕度。每2 d更換培養(yǎng)液。取對(duì)數(shù)生長(zhǎng)期細(xì)胞用于實(shí)驗(yàn)。

1.2.2細(xì)胞分組及轉(zhuǎn)染:取對(duì)數(shù)生長(zhǎng)期的HEK293細(xì)胞懸液傳代于φ6 cm培養(yǎng)皿(分為Vector+NS組、Vector+IL-1β組、WNK3+IL-1β組),根據(jù)Lipofectamine 2000試劑盒操作步驟,待細(xì)胞生長(zhǎng)密度在40%時(shí)按表1劑量進(jìn)行質(zhì)粒DNA轉(zhuǎn)染。轉(zhuǎn)染4 h后換成正常培養(yǎng)液。

表1 細(xì)胞分組及質(zhì)粒DNA轉(zhuǎn)染劑量表

1.2.3CCK-8法測(cè)定細(xì)胞活性:細(xì)胞轉(zhuǎn)染4 h后換成正常培養(yǎng)液繼續(xù)培養(yǎng)20 h,細(xì)胞以1×104個(gè)細(xì)胞/每孔的密度重新接種于96孔板,參考預(yù)實(shí)驗(yàn)及文獻(xiàn)[7]用藥劑量,加藥組培養(yǎng)液為DMEM+10% FBS+10 ng/mL IL-1β,每孔100 μL;對(duì)照組培養(yǎng)液為等量DMEM+10% FBS。于37 ℃孵箱中孵育0、12、24、36 和48 h時(shí),換成10 μL CCK-8+100 μL DMEM正常培養(yǎng)液(每個(gè)時(shí)間點(diǎn)設(shè)5個(gè)復(fù)孔)。以加入等量CCK-8溶液、藥物以及細(xì)胞培養(yǎng)液,但不含細(xì)胞的孔作為空白對(duì)照。在37 ℃細(xì)胞培養(yǎng)箱內(nèi)繼續(xù)孵育1.5 h(避光)。使用酶標(biāo)儀測(cè)定每孔的吸光度值(OD值),測(cè)定波長(zhǎng)為450 nm。細(xì)胞活力(%)=[A(加藥)-A(空白)]/[A(0加藥)-A(空白)]×100。A(加藥):加有CCK8溶液、細(xì)胞和藥物溶液的孔的吸光度。A(空白):加有CCK8溶液和培養(yǎng)基而沒有細(xì)胞的孔的吸光度。A(0加藥):沒有藥物溶液,但加有細(xì)胞、CCK-8溶液的孔的吸光度。

1.3WNK3激酶對(duì)不同干預(yù)條件下HEK293細(xì)胞形態(tài)學(xué)的影響 取1×104的HEK293細(xì)胞懸濁液傳代于3 盤φ6 cm培養(yǎng)皿,轉(zhuǎn)染方案同1.2.2,轉(zhuǎn)染后20 h再次以1×104懸液分別接種于3盤φ6 cm培養(yǎng)皿,使藥物干預(yù)時(shí)3盤細(xì)胞密度相同,加藥方案見表1。0 h 和36 h時(shí)在光學(xué)倒置顯微鏡下觀察細(xì)胞形態(tài)學(xué)變化。

1.4Western blot法測(cè)定WNK3激酶過表達(dá)對(duì)HEK293細(xì)胞凋亡蛋白及JNK蛋白的影響

1.4.1細(xì)胞干預(yù)及蛋白收集:細(xì)胞分組及轉(zhuǎn)染方案同1.2.2,每組3盤,于孵箱中孵育0、18、36 h時(shí)收集細(xì)胞蛋白檢測(cè)Caspase系列凋亡蛋白。另重新按上述方案?jìng)鞔稗D(zhuǎn)染3組細(xì)胞,在IL-1β干預(yù)0、30、60 min時(shí)收集細(xì)胞,裂解后檢測(cè)JNK蛋白。

1.4.2Western blot法測(cè)定:預(yù)冷PBS洗滌細(xì)胞3次,轉(zhuǎn)入EP管,加入RIPA細(xì)胞裂解液。置于冰上裂解30 mim。12 000 r/min低溫離心20 min,吸取上清液至另一離心管。取20 μL用作蛋白定量檢測(cè),其余蛋白作變性處理。方法如下:用80 ℃水浴預(yù)熱1 份6×Loading Buffer后,與5份蛋白樣品充分混勻,將混合物于100 ℃中煮沸5 min,以變性蛋白。每孔40 μg蛋白樣品。10%聚丙烯酰胺凝膠蛋白電泳時(shí),每孔加入40 μg蛋白樣品。濃縮膠電壓設(shè)定為70 mV,分離膠電壓升至120 mV。冰浴下恒流300 mA轉(zhuǎn)膜(PVDF膜)90 min,依次孵育一抗(4 ℃過夜,一抗稀釋濃度均為1:1 000)、二抗(室溫,2 h,稀釋濃度1:12 000),ECL顯色。根據(jù)蛋白不同選擇相應(yīng)的曝光時(shí)間,使用凝膠圖像處理系統(tǒng)對(duì)目的條帶的分子量和凈光密度值進(jìn)行分析。以上所有實(shí)驗(yàn)重復(fù)3次。

1.5統(tǒng)計(jì)學(xué)處理方法 數(shù)據(jù)分析采用統(tǒng)計(jì)學(xué)軟件SPSS20.0。所有定量資料以±s表示。定量資料多組間比較采用ONE-WAY ANOVA;多重比較,方差齊性采用LSD檢驗(yàn),方差不齊采用Dunnett T3檢驗(yàn)。兩因素的分析采用析因分析。P<0.05為差異有統(tǒng)計(jì)學(xué)意義。

2 結(jié)果

2.1CCK-8法檢測(cè)WNK3過表達(dá)對(duì)IL-1β干預(yù)下HEK293細(xì)胞活性的影響 結(jié)果顯示,Vector+NS組予等量0.9%氯化鈉溶液干預(yù)0~48 h,細(xì)胞活性變化差異無統(tǒng)計(jì)學(xué)意義(P>0.05)。而Vector+IL-1β組在給予10 ng/mL IL-1β后細(xì)胞活性即開始逐漸下降,在24 h時(shí),與同組0 h時(shí)比較差異有統(tǒng)計(jì)學(xué)意義(P<0.05),在48 h時(shí)達(dá)到最低值(P<0.01)。WNK3+IL-1β組下降幅度較緩和,在36和48 h時(shí)與同組0 h時(shí)比較差異有統(tǒng)計(jì)學(xué)意義(均P<0.05),但與同時(shí)間點(diǎn)Vector+IL-1β組比較細(xì)胞活性有所回升,在48 h時(shí)差異有統(tǒng)計(jì)學(xué)意義(P<0.01),見表2。

表2 IL-1β誘導(dǎo)HEK293細(xì)胞不同時(shí)間點(diǎn)的活性(n=6,±s,%)

2.2WNK3過表達(dá)對(duì)IL-1β干預(yù)下HEK293細(xì)胞形態(tài)的影響 結(jié)果顯示,在0 h相同接種密度前提下,Vector+IL-1β組36 h細(xì)胞密度明顯比Vector+NS組低,其細(xì)胞伸張程度較低,部分細(xì)胞形態(tài)接近圓形,細(xì)胞內(nèi)空泡較多。WNK3+IL-1β組細(xì)胞密度較Vector+IL-1β組增高,細(xì)胞內(nèi)空泡減少,且部分細(xì)胞呈橢圓形或梭性。見圖1。

2.3WNK3過表達(dá)對(duì)IL-1β誘導(dǎo)HEK293細(xì)胞凋亡各時(shí)間點(diǎn)相關(guān)凋亡蛋白表達(dá)的影響 結(jié)果顯示:Vector+ NS組在等量0.9%氯化鈉溶液干預(yù)過程中Caspase-3變化差異無統(tǒng)計(jì)學(xué)意義(P>0.05),未檢測(cè)到剪切后的Caspase-3及Caspase-9。而Vector+IL-1β組在給藥后18 h Caspase-9和Caspase-3表達(dá)量開始逐漸下降,干預(yù)開始即檢測(cè)到較為顯著的cleaved Caspase-9,18 h到達(dá)高峰,36 h略有下降,同時(shí)在36 h時(shí)檢測(cè)到較為顯著的cleaved Caspase-3。與36 h的Vector+IL-1β組比較,WNK3+IL-1β組的cleaved Caspase-3顯著減少(蛋白條帶灰度量化值815.80±63.44 vs 350.33±51.52,P<0.01),2組的cleaved Caspase-9在18 h(791.96±92.26 vs 349.88±97.40)及36 h(308.89±45.76 vs 103.98±36.03)時(shí)差異有統(tǒng)計(jì)學(xué)意義(均P<0.05)。見圖2。

圖1 WNK3過表達(dá)對(duì)IL-1β干預(yù)下HEK293細(xì)胞形態(tài)的影響(×200,箭頭示細(xì)胞內(nèi)空泡)

圖2 IL-1β誘導(dǎo)HEK細(xì)胞凋亡過程中Caspase-3及Caspase-9蛋白變化

2.4WNK3過表達(dá)對(duì)HEK293細(xì)胞凋亡中JNK通路的影響 結(jié)果顯示:Vector+NS組在等量0.9%氯化鈉溶液干預(yù)1 h內(nèi)沒有檢測(cè)到顯著的磷酸化JNK(p-JNK),IL-1β干預(yù)后,Vector+IL-1β組p-JNK在30 min開始顯著增加。與Vector+IL-1β組比較,WNK3轉(zhuǎn)染后p-JNK的表達(dá)水平在30 min(1 068.67±60.29 vs 603.33±70.94)和60 min(1 183.12±142.91 vs 775.50±107.48)顯著降低(均P<0.05),見圖3。

圖3 IL-1β誘導(dǎo)HEK細(xì)胞凋亡過程JNK通路蛋白變化

3 討論

IL-1β屬多肽類生長(zhǎng)因子,主要由單核細(xì)胞和巨噬細(xì)胞產(chǎn)生,它能直接啟動(dòng)凋亡的細(xì)胞內(nèi)過程,具有強(qiáng)烈的誘發(fā)細(xì)胞凋亡作用[8]。故本實(shí)驗(yàn)選取IL-1β作為激活MAPKS通路及促進(jìn)細(xì)胞內(nèi)源性凋亡的誘導(dǎo)劑,觀察WNK3對(duì)IL-1β誘導(dǎo)的細(xì)胞凋亡有無保護(hù)作用。CCK-8結(jié)果顯示IL-1β能促使HEK293細(xì)胞的活性下降,而轉(zhuǎn)染W(wǎng)NK3可以有效逆轉(zhuǎn)細(xì)胞活性。細(xì)胞形態(tài)學(xué)觀察提示W(wǎng)NK3過表達(dá)有利于細(xì)胞增殖和細(xì)胞形態(tài)的維持。

WNK3在體內(nèi)參與腎臟鈉離子的吸收、細(xì)胞骨架形成、細(xì)胞凋亡及腫瘤細(xì)胞的侵襲轉(zhuǎn)移等[9-10]。既往研究表明轉(zhuǎn)染W(wǎng)T(野生型)-WNK3質(zhì)粒的子宮頸癌細(xì)胞,在actinomycin-D誘導(dǎo)凋亡處理下的存活時(shí)間顯著長(zhǎng)于沒有轉(zhuǎn)染W(wǎng)T-WNK3質(zhì)粒的子宮頸癌細(xì)胞,表明WNK3可延長(zhǎng)細(xì)胞存活時(shí)間,延緩細(xì)胞凋亡[5]。除此之外,有學(xué)者報(bào)道Lingo-1受體能通過抑制WNK3的活性而促進(jìn)神經(jīng)細(xì)胞的凋亡,推斷WNK3在神經(jīng)細(xì)胞中也具有抗凋亡作用[6]。

細(xì)胞凋亡的外源性途徑的活化是通過特定的死亡配體與細(xì)胞表面的死亡受體相互作用而介導(dǎo)的,可招募胞質(zhì)中的procaspase-8,使其通過自身剪切而活化,激活下游的效應(yīng)Caspase,如:Caspase-3、Caspase-6等,以剪切胞漿和核底物,誘導(dǎo)細(xì)胞發(fā)生凋亡。凋亡的內(nèi)源性途徑主要通過線粒體介導(dǎo),當(dāng)細(xì)胞受到應(yīng)激刺激時(shí),一些促凋亡蛋白如Bcl-2等從線粒體被釋放入胞漿,與凋亡激活因子Apaf-1結(jié)合,將Caspase-9前體活化,繼而誘導(dǎo)下游Caspase-3 及Caspase-7的活化,引發(fā)凋亡程序[11-12]。因此,Caspase-3是兩條途徑的下游共同關(guān)鍵調(diào)控凋亡蛋白。本研究結(jié)果顯示,在10 ng/mL的IL-1β誘導(dǎo)下,HEK293細(xì)胞中剪切后的Caspase-9和Caspase-3顯著上調(diào),Caspase-3的剪切體在36 h、Caspase-9剪切體在18 h時(shí)表達(dá)增強(qiáng)達(dá)到高峰,而cleaved Caspase-9在IL-1β誘導(dǎo)36 h時(shí)表達(dá)反而有一定的降低,這可能是細(xì)胞在凋亡晚期時(shí),Caspase已經(jīng)執(zhí)行完任務(wù),其生理功能開始降解,細(xì)胞大多進(jìn)入凋亡晚期的情況有關(guān)。這說明IL-1β可以通過內(nèi)源性途徑誘導(dǎo)HEK293細(xì)胞發(fā)生凋亡。WNK3過表達(dá)主要通過凋亡的內(nèi)源性途徑,抑制Caspase-9前體活化,并使下游Caspase-3活化減少,使相關(guān)凋亡蛋白表達(dá)程度下降,起到一定的抗凋亡作用。

JNK信號(hào)通路是MAPK中重要的通路之一。JNK通路的激活與多種系統(tǒng)的促凋亡作用有關(guān)。其中一條途徑是通過磷酸化c-Jun和ATF-2激活轉(zhuǎn)錄因子AP-1,引起FasL表達(dá)增強(qiáng),促進(jìn)細(xì)胞凋亡。另一途徑是通過磷酸化Bcl-2和Bcl-xL,促進(jìn)線粒體釋放細(xì)胞色素C,從而激活Caspase級(jí)聯(lián)反應(yīng),導(dǎo)致細(xì)胞凋亡[13]。本研究中IL-1β激活HEK293細(xì)胞的JNK,引起Caspase級(jí)聯(lián)反應(yīng),最終導(dǎo)致細(xì)胞凋亡。WNK3過表達(dá)主要通過抑制JNK磷酸化,減少Caspase-3、Caspase-9的剪切激活,減輕腎臟細(xì)胞凋亡程度,提升HEK293細(xì)胞在外界不利因素刺激下的存活率。

總之,WNK3激酶可抑制HEK293細(xì)胞的JNK磷酸化,通過Caspase途徑減少腎臟細(xì)胞凋亡。雖然目前國際上主流觀點(diǎn)認(rèn)為WNK3主要負(fù)責(zé)腎臟鈉離子的吸收,與高血壓的發(fā)生發(fā)展有關(guān),主要關(guān)注如何對(duì)其進(jìn)行下調(diào)[14-16],但本研究也顯示W(wǎng)NK3具有保護(hù)腎臟細(xì)胞在不利條件下的生存能力,故建議在調(diào)控過程中避免對(duì)其進(jìn)行過度抑制,以免影響腎臟細(xì)胞生存能力。

參考文獻(xiàn):

[1]ZHOU B,WANG D,FENG X,et al.WNK4inhibits NCC protein expression through MAPK ERK1/2 signaling pathway[J].Am J Physiol Renal Physiol,2012,302(5):F533-539.

[2]CHENG L,WU Q,KORTENOEVEN M L,et al.A systems level analysis of vasopressin-mediated signaling networks in kidney distal convoluted tubule cells[J].Sci Rep,2015,5(4):12829.

[3]GLOVER M,O’SHAUGHNESSY K M.SPAK and WNK kinases:a new target for blood pressure treatment?[J].Curr Opin Nephrol Hypertens,2011,20(1):16-22.

[4]MCDONOUGH A A.Mechanisms of proximal tubule sodium transport regulation that link extracellular fl uid volume and blood pressure[J].Am J Physiol Regul Integr Comp Physiol,2010,298(4):R851-861.

[5]VERíSSIMO F,SILVA E,MORRIS J D,et al.Protein kinase WNK3increases cell survival in a caspase-3-dependent pathway[J].Oncogene,2006,25(30):4172-4182.

[6]ZHANG Z H,XU X H,XIANG Z H,et al.LINGO-1 receptor promotes neuronal apoptosis by inhibiting WNK3kinase activity[J].J Biol Chem,2013,288(17):12152-12160.

[7]王玉,李曉玫,王海燕.白介素-1β通過JNK/p38信號(hào)轉(zhuǎn)導(dǎo)通路調(diào)控腎系膜細(xì)胞表達(dá)α-平滑肌肌動(dòng)蛋白[J].生理學(xué)報(bào),2002,54(3):244-250.

[8]WANG L,GAI P,XU R,et al.Shikonin protects chondrocytes from interleukin-1beta-induced apoptosis by regulating PI3K/Akt signaling pathway[J].Int J Clin Exp Pathol,2015,8(1):298-308.

[9]徐寧,王德選.WNK3激酶與腎小管鈉離子轉(zhuǎn)運(yùn)[J].國際泌尿系統(tǒng)雜志,2015,35(1):123-126.

[10]LAGNAZ D,ARROYO J P,CHáVEZ-CANALES M,et al.WNK3abrogates the NEDD 4-2-mediated inhibition of the renal Na+-Cl-cotransporter[J].Am J Physiol Renal Physiol,2014,307 (3):F275-286.

[11]ZAMAN S,WANG R,GANDHI V.Targeting executioner procaspase-3 with the procaspase activating compound BPAC-1 induces apoptosis in multiple myeloma cells[J].Exp Hematol,2015,S0301-472X(15):531-537.

[12]SINGLA N,DHAWAN D K.Zinc down regulates Apaf-1-dependent Bax/Bcl-2 mediated caspases activation during aluminium induced neurotoxicity[J].Biometals,2015,28(1):61-73.

[13]CAO J,CHEN J,XIE L,et al.Protective properties of sesamin against fl uoride-induced oxidative stress and apoptosis in kidney of carp (Cyprinus carpio) via JNK signaling pathway[J].Aquat Toxicol,2015,167:180-190.

[14]OI K,SOHARA E,RAI T,et al.A minor role of WNK3in regulating phosphorylation of renal NKCC2 and NCC cotransporters in vivo[J].Biol Open,2012,1(2):120-127.

[15]PACHECO-ALVAREZ D,VAZQUEZ N,CASTANEDABUENO M,et al.WNK3-SPAK interaction is required for the modulation of NCC and other members of the SLC12 family[J].Cell Physiol Biochem,2012,29:291-302.

[16]HAAS B R,CUDDAPAH V A,WATKIN S,et al.With-No-Lysine Kinase 3(WNK3) stimulates glioma invasion by regulating cell volume[J].Am J Physiol Cell Physiol,2011,301(5):1150-1160.

(本文編輯:丁敏嬌)

·論 著·

The protective effect of WNK3kinase on apoptosis in HEK293 cell induced by interleukin-1β

WANG Dex-uan,YE Xiaohua,YU Lingfang,LIN Hongzhou,ZHUANG Jieqiu,YANG Qing,ZHENG Wenjie.Department of Pediatrics,the Second Affi liated & Yuying Children’s Hospital of Wenzhou Medical University,Wenzhou,325027

Abstract:Objective:To observe the effect of high expression of WNK3on apoptosis in HEK293 cells induced by interleukin-1β.Methods:The HEK293 cells were divided into 3 groups (Vector+NS group,Vector+IL-1β group and WNK3+IL-1β group),then tansfection was performed.Liposome 2000 was added to the 1stand 2ndgroup with PCMV-HA-Vector as the blank and negative control respectively; WNK3was added to the 3rdgroup.After treated with 10 ng/mL IL-1β (the 2ndand 3rdgroup) or the same amount of normal saline (the 1stgroup),the CCK8 analysis was performed for the detection of cell activity after incubation for 0 h,12 h,24 h,36 h and 48 h at 37 ℃ respectively.Cell proteins were collected after 0 h,18 h and 36 h incubation respectively for detection of Caspase-3,Cleaved Caspase-3,Caspase-9,Cleaved Caspase-9.In addition,cell protein were collected 0 min,30 min and 60 min after the treatment of IL-1β for JNK detection.Results:No signifi cant difference of cell activity was observed in the Vector+NS group within 48 h.In the Vector+IL-1β group,cell activity began to decline soon after administration.Signifi cant difference could be found after 24 h and the cell activity reached the lowest at 48 h (P<0.01).Cell activity of WNK3+IL-1β group declined in a moderate manner and the signifi cant difference appeared at 36 h and 48 h when comparing with that at 0 h in the same group (both P<0.05).However,in comparison with the Vector+IL-1β group at the same time point,cell activity of WNK3+IL-1β group was still a little higher and the signifi cant difference could be observed at 48 h (P<0.01).The expression of Caspase-9 and Caspase-3 began to decline 18 h after the administration with an increasing peak of cleaved Caspase-9 which decreased slightly at 36 h.An obvious cleaved Caspase-3 could also be observed 36 h after thebook=2,ebook=6administration.In the WNK3+IL-1β group,the decline of Caspase-3 was more moderate when comparing with that in the Vector+IL-1β group.A small quantity of cleaved Caspase-3 could be detected and showed an statistical signifi cance in comparison with that of the same group at 0 h (P<0.05) with the WNK3; the expression of p-JNK declined but t-JNK did not change.Conclusion:IL-1β may decrease activity of HEK293 cells while transfection of WNK3may partly reverse this affection of IL-1β.The over expression of WNK3may inhibit the activation of JNK pathways induced by IL-1β,decrease the activation of Caspase pathway to reduce apoptosis,and fi nally protect the kidney cells under adverse conditions.

Key words:WNK3; JNK; IL-1β; kidney; apoptosis

通信作者:鄭雯潔,副主任醫(yī)師,Email:wzwjzheng@sina.com。

作者簡(jiǎn)介:王德選(1977-),男,浙江蒼南人,主治醫(yī)師,博士。

基金項(xiàng)目:國家自然科學(xué)基金青年基金資助項(xiàng)目(81200513);錢江人才項(xiàng)目(2011R10049);溫州市科技局科研基金資助項(xiàng)目(H20110014)。

收稿日期:2015-07-10

[中圖分類號(hào)]S941.42

[文獻(xiàn)標(biāo)志碼]A

DOI:10.3969/j.issn.2095-9400.2016.01.001

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