The therapeutic efect of berberine on pathological changes of skin in rats with atopic dermatitis based on the Pl3K/Akt/NF- ΠκB signaling pathway
JIANG Su,LI Dongxia,LYU Xinxiang, CUI Yanhong,LYULiting
Departmentof Dermatologyand Venereology,Afliated HospitalofInerMongolia Medical University, Hohhot O050,Chi
Abstract:ObjectiveTo explore the therapeutic mechanismof berberine inatopic dermatitis (AD)rats basedon PI3K/ Akt/NF-kappa B signaling pathway.MethodsSixty adult male Wistarrats were randomlydivided into the blank group (normal rats), the control group (AD model, 50mg/kg berberine treatment) and the experimental group (AD model, 200mg/kg berberinetreatment),with2Orats ineachgroup.Thelevelsof interleukin-4(IL-4),interleukin-13(IL-13)andtumor necrosis factor- α (TNF- α )were determined by enzyme-linked immunosorbent assay (ELISA) at1d,7 dand14d of intervention. The protein levels of PI3K,p-PI3K,Akt,p-Akt and NF- κI 3p65 were detected by Western blot assay. Pathologicalchangesofratskintissue wereanalyzedbyHEstaining.ResultsAfterinterventionfor1d,7dand14d, serum levels of IL-4,IL-13,TNF- ∝ and PI3K,p-PI3K,Akt,p-Akt and NF-kappa B p65 were higherin the control group than those intheblank group( Plt;0.05 ).Afterinterventionfor7dand14d,thelevelsof theabove indicatorswerelower in the experimental group than those in the control group ( Plt;0.05 ).After14 days of intervention,compared with the blank group,theskintissue ofrats inthecontrol groupand theexperimental groupshowedobvious pathologicalchanges,including thickening of epidermis layer,excesive keratinization of the stratum corneum,thickening of spinous layer anda large infiltrationof inflammatorycelsindermis.Thepathologicaldamageofratskin tissue was significantlyallviated inthe experimental group.ConclusionBerberinecan inhibittheactivationof PI3K/Akt/NF-kappa Bsignaling pathway,reduce serum level of inflammatory factors and reduce pathological damage of skin tissue in AD rats.
Keywords:dermatitis,atopic;berberine;phosphatidylinositol3-kinases;protooncogeneproteinsc-akt;NF-kappaB; cytokines; skin tissue
特應(yīng)性皮炎(atopicdermatitis,AD)是一種以皮膚干燥、慢性瘙癢和復(fù)發(fā)性炎癥為特征的慢性炎癥性皮膚病1。隨著環(huán)境因素變化及生活方式改變,AD全球發(fā)病率呈顯著上升趨勢(shì)[2]。當(dāng)前臨床主要采用藥物治療(如糖皮質(zhì)激素、免疫抑制劑),物理治療(紫外線療法),中醫(yī)藥治療(口服中藥、針灸)等綜合干預(yù)措施,但仍具有治療抵抗率高、易復(fù)發(fā)等問題。黃連素(Berberine)是從黃連、黃柏等藥用植物中提取的異喹啉類生物堿。既往研究證實(shí)其具有抗炎、抗菌、免疫調(diào)節(jié)及抗腫瘤等多重藥理作用[3],在銀屑病、濕疹等炎癥性皮膚病治療中展現(xiàn)出潛在價(jià)值,但其對(duì)AD的具體作用機(jī)制尚未完全闡明。磷脂酰肌醇3激酶(PI3K)/蛋白激酶B(Akt)/核因子 κB 中 [NF-κB 信號(hào)通路作為調(diào)控細(xì)胞增殖、分化、調(diào)亡及炎癥反應(yīng)的關(guān)鍵通路[4,其異常激活與AD皮膚屏障破壞、Th2型免疫偏移等病理過(guò)程密切相關(guān)[5]。本研究通過(guò)構(gòu)建AD大鼠模型,探討黃連素對(duì)AD大鼠的治療作用,并基于 PI3K/Akt/NF-κB 信號(hào)通路揭示其潛在的分子機(jī)制。
1材料與方法
1.1實(shí)驗(yàn)材料
1.1.1實(shí)驗(yàn)動(dòng)物SPF級(jí)成年雄性Wistar大鼠60只,11\~12周齡,體質(zhì)量 210~254g ,購(gòu)自上海懿尚生物科技有限公司,實(shí)驗(yàn)動(dòng)物生產(chǎn)許可證號(hào):SCXK(滬)2022-0011,使用許可證號(hào):SYXK(滬)2022-0029。大鼠均在溫度 (22±2)°C 、相對(duì)濕度50%~60% ,人工光照黑暗循環(huán) 12h/12h 的SPF級(jí)環(huán)境下進(jìn)行飼養(yǎng),大鼠自由攝取食水,適應(yīng)性飼養(yǎng)7d后進(jìn)行實(shí)驗(yàn)。本研究經(jīng)過(guò)本院倫理委員會(huì)批準(zhǔn)[編號(hào):(2024)倫審第(35)號(hào)]。
1.1.2主要試劑與儀器黃連素(溶于 0.5% 羥甲基纖維素鈉溶液,北京索萊寶科技有限公司);卵清蛋白(OVA,美國(guó)Sigma-Aldrich);氫氧化鋁凝膠(杭州萬(wàn)景新材料有限公司,國(guó)藥準(zhǔn)字H33021601,規(guī)格 100g) ;白細(xì)胞介素(IL)-4、IL-13、腫瘤壞死因子 -α(TNF-α 酶聯(lián)免疫吸附試驗(yàn)(ELISA)試劑盒(上海酶聯(lián)生物科技有限公司);抗體試劑包括PI3K抗體(美國(guó)CST)、 -PI3K抗體(英國(guó)Abcam)、Akt抗體(美國(guó)Santa Cruz Biotechnology) ??p-Akt 抗體(美國(guó)BDBiosciences)和NI
抗體(美國(guó)CST)。Westernblot電泳儀(美國(guó)伯樂生物醫(yī)學(xué)有限公司);光學(xué)顯微鏡(日本奧林巴斯);低溫高速離心機(jī)(山東博科保育科技股份有限公司,TGL-16E);質(zhì)譜流式儀(美國(guó)富魯達(dá)公司,PLR-386);紫外可見分光光度計(jì)(南京貝登醫(yī)療股份有限公司,UV-5100型);自動(dòng)脫水機(jī)(德國(guó)徠卡公司,ASP300S);石蠟包埋機(jī)(德國(guó)徠卡公司,HistoCoreAcadiH);恒溫培養(yǎng)箱(上海?,敼荆珼PX.9082)。
1.2實(shí)驗(yàn)方法
1.2.1構(gòu)建AD模型(1)制備OVA混懸液: 100μg 0VA 粉末與 2mg 氫氧化鋁凝膠混合,加入無(wú)菌生理鹽水或?qū)S镁彌_液,經(jīng)渦旋震蕩制備成均質(zhì)穩(wěn)定混懸液。(2)腹腔注射致敏:取40只大鼠進(jìn)行建模,將大鼠腹部朝上固定,腹腔注射100μg0VA 混懸液,觀察大鼠的反應(yīng),若出現(xiàn)嚴(yán)重的過(guò)敏反應(yīng)或其他異常情況,及時(shí)給予抗過(guò)敏藥物或進(jìn)行急救。(3)制備 1% OVA溶液:取適量OVA粉末,用無(wú)菌生理鹽水或特定的溶劑充分溶解后制成 1% 的OVA溶液。(4)背部涂抹激發(fā):
于首次致敏后的第15天暴露大鼠背部皮膚并使用無(wú)菌棉簽均勻涂抹 1%OVA 溶液 (50μL/cm2) ,每日1次,連續(xù)7d。(5)實(shí)驗(yàn)監(jiān)測(cè)與評(píng)估:記錄每日進(jìn)食量、飲水量及搔抓頻率,致敏24h 后檢測(cè)血清IgE水平,處死大鼠后取其皮膚組織進(jìn)行HE染色,觀察真皮層炎性細(xì)胞浸潤(rùn)及淋巴濾泡壞死等病理特征。建模成功需同時(shí)滿足如下3項(xiàng)標(biāo)準(zhǔn): 10min 持續(xù)搔抓超過(guò)25次、血清 IgEgtrsim200μg/L 和組織病理學(xué)典型改變。
1.2.2分組與給藥方法采用隨機(jī)數(shù)字表法將60只大鼠分為空白組、對(duì)照組、實(shí)驗(yàn)組,每組20只。空白組僅予以適應(yīng)性喂養(yǎng),不做任何處理;對(duì)照組、實(shí)驗(yàn)組大鼠在成功構(gòu)建AD模型后分別給予低( 50mg/kg 高 200mg/kg) 劑量黃連素灌胃治療,7d內(nèi)給藥3次,干預(yù)14d,共給藥6次。
1.2.3ELISA法檢測(cè)血清IL-4、IL-13、TNF- σ?∝ 水平分別于干預(yù)1d、7d和14d時(shí),采集大鼠空腹尾靜脈血,以 3200r/min 離心 10min (半徑 10cm 后獲取血清,采用ELISA法測(cè)定血清IL-4、IL-13、TNF- α∝α∝ 水平,按照試劑盒說(shuō)明進(jìn)行操作。
1.2.4Westernblot 檢測(cè) PI3K、p-PI3K、Akt、p-Akt、 NF-κB p65 蛋白表達(dá)水平于干預(yù)1d、7d和14d時(shí),按照1.2.3中的方法分別獲取血清,提取血清中蛋白,使用BCA法檢測(cè)蛋白質(zhì)量。蛋白樣本經(jīng)過(guò) 10% SDS-聚丙烯酰胺凝膠電泳分離,按凝膠面積以 0.65mA/cm2 恒流電轉(zhuǎn)移 1.5h ,將蛋白自凝膠轉(zhuǎn)移至PVDF膜上。使用 5% 脫脂奶粉封閉膜,2h后在膜上加入1:1000 稀釋的兔抗人PI3K、p-PI3K、Akt、p-Akt、NF- κB p65,4 ℃孵育過(guò)夜。洗膜后加入 1:2000 稀釋的辣根過(guò)氧化物酶標(biāo)記的羊抗兔IgG二抗,孵育 1.5h ,使用ECL化學(xué)發(fā)光試劑盒對(duì)膜進(jìn)行顯影,并分析蛋白灰度值,以 β -actin作為內(nèi)參,實(shí)驗(yàn)重復(fù)3次。
1.2.5HE染色觀察大鼠皮膚組織病理變化干預(yù)14d后,分別對(duì)各組大鼠背部皮膚進(jìn)行圖像采集以觀察皮膚狀態(tài),并切取皮膚病變組織樣本。樣本經(jīng) 10% 中性福爾馬林緩沖液固定 24~48h 后,依次進(jìn)行梯度乙醇脫水、二甲苯透明及石蠟包埋處理,制備 3~5μm 厚切片。采用HE染色法進(jìn)行病理分析,具體流程包括:切片脫蠟復(fù)水、蘇木精染色 5min 、鹽酸乙醇分化、伊紅復(fù)染 2min ,最后經(jīng)梯度乙醇脫水及二甲苯透明處理,置于光學(xué)顯微鏡下( ×200 觀察組織病理學(xué)變化。
1.3統(tǒng)計(jì)學(xué)方法采用SPSS26.0軟件進(jìn)行數(shù)據(jù)分析。計(jì)量資料以均數(shù) 標(biāo)準(zhǔn)差
表示,不同時(shí)點(diǎn)多組間比較采用重復(fù)測(cè)量設(shè)計(jì)的方差分析。 Plt;0.05 為差異有統(tǒng)計(jì)學(xué)意義。
2結(jié)果
2.13組血清炎性因子水平比較3組大鼠干預(yù)不同時(shí)點(diǎn)血清IL-4、IL-13、TNF- σ?α∝ 水平差異均有統(tǒng)計(jì)學(xué)意義,且組間與干預(yù)時(shí)間存在交互效應(yīng)( (Plt; 0.05)。干預(yù) 1d,7d,14d 時(shí),對(duì)照組和實(shí)驗(yàn)組血清IL-4、IL-13、TNF- ∝ 水平均高于空白組 (Plt;0.05) 。干預(yù)1d時(shí),實(shí)驗(yàn)組血清IL-4、IL-13、TNF- 水平與對(duì)照組差異均無(wú)統(tǒng)計(jì)學(xué)意義( (Pgt;0.05 ;干預(yù) 7d 、14d時(shí),實(shí)驗(yàn)組血清IL-4、IL-13、TNF- σ∝ 水平均低于對(duì)照組 (Plt;0.05 ,見表1。
2.23組大鼠PI3K ?p? -PI3K、Akt、p-Akt、NF- κB p65蛋白表達(dá)水平比較建模后干預(yù)不同時(shí)點(diǎn)3組PI3K、p-PI3K、Akt、p-Akt、NF- κB p65蛋白表達(dá)水平差異均有統(tǒng)計(jì)學(xué)意義,且組間與干預(yù)時(shí)間存在交互效應(yīng) (Plt;0.05 )。干預(yù)1d時(shí),對(duì)照組和實(shí)驗(yàn)組PI3K、p-PI3K、Akt、p-Akt、 蛋白表達(dá)水平均高于空白組 (Plt;0.05 ,實(shí)驗(yàn)組各蛋白表達(dá)水平與對(duì)照組差異無(wú)統(tǒng)計(jì)學(xué)意義(
。干預(yù)7d、14d時(shí),對(duì)照組PI3K、p-PI3K、Akt、p-Akt、NF-κB p65蛋白表達(dá)水平均高于空白組 (Plt;0.05) ;實(shí)驗(yàn)組除干預(yù)7d時(shí)Akt及干預(yù) 14d 時(shí)
-PI3K、NF- κB p65蛋白表達(dá)水平與空白組差異無(wú)統(tǒng)計(jì)學(xué)意義外,其余蛋白表達(dá)水平均高于空白組 (Plt;0.05) ;實(shí)驗(yàn)組各蛋白表達(dá)水平均低于對(duì)照組 (Plt;0.05 ,見表2。
2.33組大鼠皮膚組織的病理變化治療14d時(shí),皮膚組織病理檢查結(jié)果顯示,空白組大鼠皮膚組織結(jié)構(gòu)完整,表皮層薄,角質(zhì)層正常,無(wú)炎性細(xì)胞浸潤(rùn);對(duì)照組和實(shí)驗(yàn)組大鼠皮膚組織出現(xiàn)明顯的病理改變,表皮層增厚,角質(zhì)層過(guò)度角化,棘層肥厚,真皮層有大量炎性細(xì)胞浸潤(rùn);與對(duì)照組相比,實(shí)驗(yàn)組大鼠皮膚組織的病理?yè)p傷明顯減輕,表皮層厚度、角質(zhì)層角化程度、棘層肥厚程度以及炎性細(xì)胞浸潤(rùn)程度均有所改善,見圖1、2。
3討論
AD作為一種慢性炎癥性皮膚病,其病理機(jī)制與免疫系統(tǒng)異?;罨芮邢嚓P(guān)[6]。PI3K/Akt/NF- σκB 信號(hào)通路通過(guò)調(diào)控細(xì)胞增殖、分化、凋亡及炎癥反應(yīng),在AD病理過(guò)程中發(fā)揮關(guān)鍵作用,因此被視為潛在治療靶點(diǎn)[]。黃連素可通過(guò)抑制PI3K/Akt/NF- σκB 信號(hào)通路發(fā)揮抗炎作用,如一些AD動(dòng)物模型的研究結(jié)果表明,黃連素能夠顯著減輕皮膚炎癥反應(yīng),降低促炎細(xì)胞因子表達(dá)水平,并改善皮膚病理改變;其作用機(jī)制可能包括直接抑制PI3K活性,進(jìn)而阻斷Akt磷酸化及 NF-κB 核轉(zhuǎn)位,減少炎癥介質(zhì)的產(chǎn)生[8-9]。此外,黃連素還可能通過(guò)抑制Th2細(xì)胞活化、調(diào)控細(xì)胞因子釋放等其他信號(hào)通路,在AD治療中呈現(xiàn)多靶點(diǎn)作用特性[10]。目前關(guān)于黃連素治療AD的研究仍處于探索階段,其臨床療效和安全性尚需通過(guò)系統(tǒng)的實(shí)驗(yàn)研究與臨床試驗(yàn)進(jìn)一步驗(yàn)證,相關(guān)分子機(jī)制也有待深入闡明。
有研究表明,AD的發(fā)生與多種炎性因子相關(guān),其中血清IL-4、IL-13和TNF- α?∝ 水平升高是其重要特征[]。本研究結(jié)果顯示,,黃連素能夠顯著改善AD大鼠的皮膚癥狀,降低血清炎性因子IL-4、IL-13和TNF- α?∝ 水平,減輕皮膚組織病理?yè)p傷,與既往研究結(jié)果一致。IL-4和IL-13主要由Th2細(xì)胞分泌,可通過(guò)促進(jìn)B細(xì)胞產(chǎn)生IgE介導(dǎo)過(guò)敏反應(yīng)和炎癥進(jìn)程[12];TNF- σ?α∝ 則作為關(guān)鍵促炎因子,進(jìn)一步加劇炎癥反應(yīng)。黃連素能夠顯著降低這些炎性因子的水平,其機(jī)制可能包括:抑制炎性細(xì)胞活化及炎性因子釋放,調(diào)節(jié)免疫細(xì)胞功能,并減少Th2細(xì)胞分化與IL-4、IL-13的分泌[13-14]
PI3K/Akt/NF- κB 信號(hào)通路在炎癥反應(yīng)中起關(guān)鍵調(diào)控作用。本研究結(jié)果顯示,對(duì)照組AD大鼠PI3K、p-PI3K、Akt、p-Akt、NF- σκB p65蛋白表達(dá)水平均高于空白組,而實(shí)驗(yàn)組經(jīng)黃連素干預(yù)14d后,PI3K、p-PI3K、Akt、p-Akt、NF- κB p65蛋白表達(dá)水平明顯低于對(duì)照組。提示在AD中,PI3K/Akt/NF- κB 信號(hào)通路被異常激活,PI3K激活后可磷酸化Akt并促使其活化,活化的Akt進(jìn)一步激活下游 NF-κB ,最終促進(jìn)炎性因子表達(dá)及炎癥反應(yīng)增強(qiáng)[15]。而黃連素可通過(guò)抑制PI3K活性,減少Akt磷酸化,從而阻斷NF-κB 的激活過(guò)程[16]。 NF-κB 是調(diào)控炎性因子基因表達(dá)的關(guān)鍵轉(zhuǎn)錄因子,黃連素通過(guò)降低 NF-κB p65表達(dá)水平,可直接減少炎性因子的產(chǎn)生[17-18]。此外,黃連素對(duì)AD大鼠皮膚癥狀的顯著改善及組織病理?yè)p傷的減輕作用,可能與其調(diào)節(jié)血清炎性因子水平和PI3K/Akt/NF- κB 信號(hào)通路相關(guān)蛋白表達(dá)有關(guān)[19]。血清炎性因子水平的降低可有效緩解皮膚瘙癢、紅斑、丘疹等炎癥癥狀;而抑制PI3K/Akt/NF- σκB 信號(hào)通路的激活可減少炎性因子基因表達(dá),降低炎癥反應(yīng)程度,從而減輕皮膚組織的病理?yè)p傷。另有研究表明,黃連素可能通過(guò)清除氧自由基、緩解氧化應(yīng)激進(jìn)一步改善皮膚組織的損傷[20]
綜上所述,黃連素對(duì)AD具有一定治療作用,其可降低血清IL-4、IL-13、TNF- ∝ 水平及PI3K、p-PI3K、Akt、p-Akt、NF- σκB p65蛋白表達(dá)水平,其機(jī)制可能是通過(guò)抑制 PI3K/Akt/NF-κB 信號(hào)通路來(lái)發(fā)揮作用的。黃連素具有來(lái)源廣泛、價(jià)格低廉、不良反應(yīng)小等優(yōu)點(diǎn),為AD的治療提供了新的思路和方法,未來(lái)的研究可以進(jìn)一步深入探討黃連素的作用機(jī)制,優(yōu)化給藥方案,提高治療效果。
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