摘要 組織型纖溶酶原激活劑(tPA)靜脈溶栓可進(jìn)一步增加腦梗死病人出血轉(zhuǎn)化的發(fā)生率,血腦屏障破壞是出血轉(zhuǎn)化的直接原因。在腦缺血再灌注損傷過程中,tPA進(jìn)一步加劇了氧化應(yīng)激、炎性因子釋放和血管重構(gòu),從而誘導(dǎo)血腦屏障的損傷。保護(hù)血腦屏障完整性、減輕tPA溶栓后出血轉(zhuǎn)化對治療急性腦梗死有重要的臨床意義。中醫(yī)藥具有多成分、多靶點(diǎn)的治療優(yōu)勢,運(yùn)用中醫(yī)藥保護(hù)血腦屏障對臨床預(yù)防溶栓后出血具有較大的潛力。結(jié)合前期研究,綜述近年來tPA溶栓引起血腦屏障滲漏的機(jī)制,以血腦屏障通透性為靶標(biāo)挖掘減少tPA溶栓后出血的中藥資源,以期為臨床提供安全、有效的靜脈溶栓使用策略。
關(guān)鍵詞 腦梗死;組織型纖溶酶原激活劑;出血轉(zhuǎn)化;血腦屏障;中醫(yī)藥;綜述
doi:10.12102/j.issn.1672-1349.2023.24.013
基金項(xiàng)目 國家自然科學(xué)基金項(xiàng)目(No.81960227);海南省重點(diǎn)研發(fā)計(jì)劃(No.ZDYF2019196)
作者單位 1.海南醫(yī)學(xué)院(??? 571199);2.海南省中醫(yī)院臨床研究中心(??? 570203)
通訊作者 顧勇,E-mail:guyongweb@126.com
引用信息 周玉英,顧勇.組織型纖溶酶原激活劑溶栓后出血轉(zhuǎn)化的機(jī)制及中醫(yī)藥防治的研究進(jìn)展[J].中西醫(yī)結(jié)合心腦血管病雜志,2023,21(24):4549-4554.
組織型纖溶酶原激活劑(tissue-type plasminogen activator,tPA)是唯一被美國食品藥品監(jiān)督管理局(FDA)批準(zhǔn)用于治療急性腦梗死的藥物,在發(fā)病一定時(shí)間窗內(nèi)使用可達(dá)到治療效果,tPA溶栓后出血轉(zhuǎn)化發(fā)生率為3%~6%[1],延遲給藥可進(jìn)一步增加出血發(fā)生率[2]。血腦屏障可維持腦部內(nèi)物質(zhì)平衡,其結(jié)構(gòu)破壞是出血轉(zhuǎn)化的關(guān)鍵,是減輕出血轉(zhuǎn)化治療策略的靶點(diǎn)。中醫(yī)藥具有多成分、多靶點(diǎn)的治療優(yōu)勢,在減輕腦缺血再灌注損傷方面有確切的療效[3],運(yùn)用中醫(yī)藥協(xié)同tPA保護(hù)血腦屏障對臨床預(yù)防溶栓后出血具有較大的潛力。通過檢索PubMed、中國知網(wǎng)、萬方、維普等數(shù)據(jù)庫研究文獻(xiàn),結(jié)合前期研究,綜述近10年tPA溶栓引起血腦屏障滲漏的機(jī)制,系統(tǒng)梳理以血腦屏障通透性為靶標(biāo)挖掘減少tPA溶栓后出血的中藥資源,以期為臨床提供安全、有效的靜脈溶栓使用策略。
1 tPA溶栓引起的出血轉(zhuǎn)化與血腦屏障結(jié)構(gòu)破壞的關(guān)系
tPA是一種單鏈糖蛋白,是將無活性纖溶酶原裂解形成纖溶酶,纖溶酶降解血管中的纖維蛋白和部分凝血因子。各國的急性腦梗死治療指南中均推薦,在時(shí)間窗內(nèi)(3.0~4.5 h)優(yōu)先使用tPA靜脈溶栓使堵塞血管再通[4]。然而,部分病人在靜脈溶栓后血流恢復(fù)的同時(shí)常引發(fā)嚴(yán)重的腦缺血再灌注損傷和出血轉(zhuǎn)化[5],主要與tPA加劇血腦屏障損傷有關(guān)。
血腦屏障是血液與腦實(shí)質(zhì)之間的屏障,由腦微血管內(nèi)皮細(xì)胞(BMECs)、膠質(zhì)細(xì)胞、周細(xì)胞、基底膜等組成,具有半通透特性[6]。緊密連接蛋白(tight junction protein,TJP)與BMECs緊密連接,限制多數(shù)血源性物質(zhì)經(jīng)細(xì)胞旁通路進(jìn)入腦實(shí)質(zhì)[7],是維持血腦屏障完整性重要附件。BMECs外層覆蓋基底膜和細(xì)胞外基質(zhì),共同維持血腦屏障的完整性。星形膠質(zhì)細(xì)胞末足完全覆蓋于基底膜并連接神經(jīng)元、血管,保護(hù)緊密連接結(jié)構(gòu)。小膠質(zhì)細(xì)胞在內(nèi)環(huán)境破壞后迅速被激活,介導(dǎo)神經(jīng)炎癥,是炎癥誘導(dǎo)血腦屏障損傷的重要因素。血腦屏障結(jié)構(gòu)被破壞,水分子、紅細(xì)胞及血清成分進(jìn)入腦實(shí)質(zhì),造成腦水腫、出血轉(zhuǎn)化、免疫炎癥反應(yīng)和細(xì)胞毒性堆積,甚至神經(jīng)元死亡[8-10]。
相關(guān)研究表明,血腦屏障滲漏區(qū)域與發(fā)生出血轉(zhuǎn)化存在重疊區(qū)域,MRI等影像檢查可發(fā)現(xiàn)早期血腦屏障破壞,預(yù)測出血轉(zhuǎn)化風(fēng)險(xiǎn)[11-12]。急性腦梗死病人tPA治療之前完成灌注加權(quán)成像采集和梯度回憶回波序列,發(fā)現(xiàn)腦滲透率與出血分級顯著相關(guān)(P<0.01),通過釓積累證實(shí)了tPA溶栓后血腦屏障損傷程度和顱內(nèi)出血程度相關(guān)[13]。因此,血腦屏障滲漏是tPA介導(dǎo)的出血轉(zhuǎn)化關(guān)鍵[14]。
2 tPA引起血腦屏障滲漏的作用機(jī)制
tPA靜脈溶栓加重血腦屏障損傷的機(jī)制復(fù)雜,與氧化應(yīng)激、神經(jīng)炎癥、血管重構(gòu)和基質(zhì)金屬蛋白酶(MMPs)活化密切相關(guān),論述如下。
2.1 tPA與氧化應(yīng)激
tPA促進(jìn)腦缺血再灌注,給血管帶來大量活性氧簇(ROS),氧化血腦屏障結(jié)構(gòu)蛋白,釋放MMP-9,破壞血腦屏障完整性,并引發(fā)腦水腫和顱內(nèi)出血[15-16]。前期研究發(fā)現(xiàn),腦梗死早期釋放到細(xì)胞外的“危險(xiǎn)信號”分子(DAMPs)可激活小膠質(zhì)細(xì)胞,通過多種促炎信號通路,直接或間接引起神經(jīng)損傷[17-18]。在此過程中表達(dá)的誘導(dǎo)型一氧化氮合酶(iNOS)合成一氧化氮(NO),聯(lián)合灌注過程中產(chǎn)生的ROS形成活性氮自由基(RNS),從而激活MMPs,破壞血腦屏障的基質(zhì)與TJP[19],最終導(dǎo)致出血轉(zhuǎn)化。過氧亞硝酸鹽(ONOO-)是由NO結(jié)合超氧離子產(chǎn)生,可激活高通量蛋白盒1(HMGB1),促進(jìn)MMPs釋放,造成血腦屏障滲漏,抑制ONOO-活性可阻止出血轉(zhuǎn)化[20]。tPA裂解N-甲基-D-天冬氨酸(NMDA)受體,加劇缺血后谷氨酸釋放,引起鈣內(nèi)流和細(xì)胞外調(diào)節(jié)蛋白激酶激活,釋放活性氧和MMP-9,加劇神經(jīng)元死亡和出血轉(zhuǎn)化[21]。
2.2 tPA與神經(jīng)炎癥
急性腦梗死后發(fā)生神經(jīng)炎癥,與血腦屏障損傷互為因果[22]。腦缺血再灌注后,小膠質(zhì)細(xì)胞和中性粒細(xì)胞激活,炎性因子釋放,引起神經(jīng)炎癥,加重血腦屏障損傷[23-24]。血腦屏障開放條件下,tPA動(dòng)員免疫因子,增加中性粒細(xì)胞和T細(xì)胞黏附和遷移,加重內(nèi)皮損傷[25],tPA與腦血管內(nèi)皮上的低密度脂蛋白相關(guān)受體1(LRP-1)結(jié)合,上調(diào)HMGB1/Toll樣受體4(TLR4)通路、激活核因子(NF)-κB,介導(dǎo)炎癥反應(yīng),增加MMPs表達(dá),引起血腦屏障滲漏,造成出血轉(zhuǎn)化。有研究發(fā)現(xiàn),阻斷HMGB1的小分子多肽可減輕tPA介導(dǎo)的溶栓出血和血腦屏障破壞[26]。
2.3 tPA與血管重構(gòu)
血管重構(gòu)是促進(jìn)組織血流恢復(fù),減少神經(jīng)細(xì)胞損傷的重要生理改變,但早期的再灌注,微血管結(jié)構(gòu)不穩(wěn)更易產(chǎn)生血腦屏障滲漏。血管內(nèi)皮生長因子(VEGF)和血管生成素是主要血管因子。有研究對6 h后大腦中動(dòng)脈閉塞(MCAO)大鼠延遲注射tPA,發(fā)現(xiàn)TJP降低與血管生成素-2表達(dá)上調(diào)有關(guān)[27]。VEGF可促進(jìn)血管內(nèi)皮細(xì)胞分裂和增殖,研究表明,氧化因子、神經(jīng)炎癥和MMPs均參與VEGF生成,tPA通過結(jié)合星形膠質(zhì)細(xì)胞末足上的血小板衍生生長因子受體α(PDGFRα)激活血小板衍生生長因子(PDGF)-CC,促進(jìn)血管生長,增加血腦通透性,造成出血轉(zhuǎn)化[28]。
2.4 tPA與MMPs
基質(zhì)蛋白水解是血腦屏障滲漏引發(fā)出血轉(zhuǎn)化的關(guān)鍵,MMPs主要來源于中性粒細(xì)胞和小膠質(zhì)細(xì)胞,通過誘導(dǎo)蛋白水解,降解TJP和細(xì)胞外基質(zhì)(ECM)[29-30],直接造成血腦屏障滲漏和出血轉(zhuǎn)化。MMPs激活與氧化應(yīng)激、神經(jīng)炎和血管重構(gòu)有關(guān)[31]。炎性因子如腫瘤壞死因子(TNF)-α、HMGB1、iNOS等均可上調(diào)MMPs表達(dá),MMP-9是觸發(fā)出血轉(zhuǎn)化的關(guān)鍵蛋白酶。有研究以缺血再灌注模型大鼠為研究對象,結(jié)果顯示,缺血和非缺血區(qū)MMP-9表達(dá)均提高(P<0.001),注射tPA同時(shí)使用MMP-9抑制劑,顯著降低了大鼠腦梗死和出血發(fā)生率(P<0.01)[32]。tPA作用血腦屏障損傷導(dǎo)致出血轉(zhuǎn)化機(jī)制見圖1。
3 中醫(yī)藥保護(hù)血腦屏障完整性減少tPA溶栓后的出血轉(zhuǎn)化
中醫(yī)藥應(yīng)用于腦缺血再灌注損傷已有明確報(bào)道[2],多靶點(diǎn)、多效應(yīng)治療為特色優(yōu)勢。中醫(yī)藥在tPA基礎(chǔ)治療上輔助應(yīng)用降低了出血轉(zhuǎn)化發(fā)生率和死亡率。
3.1 中藥單體
中藥是中醫(yī)治療腦梗死出血的重要組成部分,其有效化合物被廣泛研究。丹參酮ⅡA磺酸鈉是丹參酮ⅡA的水溶性衍生物。一項(xiàng)對照、雙盲臨床試驗(yàn)顯示,與tPA聯(lián)合使用降低了MMP-9水平,減少腦出血同時(shí)改善了溶栓病人第10天和第90天神經(jīng)功能[33]。黃芩苷聯(lián)合tPA治療顯著降低了實(shí)驗(yàn)大鼠的ONOO-和MMPs,保護(hù)緊密連接蛋白ZO-1,降低了伊文思藍(lán)滲漏和死亡率[34]。白藜蘆醇通過抑制MMPs活性,改善了延遲注射tPA的病人缺血評分,延長了tPA使用時(shí)間窗[35]。甘草甜素在兩項(xiàng)獨(dú)立的臨床研究中被證實(shí),其可抑制延遲tPA治療產(chǎn)生的ONOO-,從而抑制HBGM1水平和MMPs激活,保護(hù)Claudin-5和Ⅳ型膠原,阻止出血轉(zhuǎn)化[36]。MCAO溶栓大鼠腹腔注射紅景天苷減少了HBMEC損傷,MMP-9活性被抑制,逆轉(zhuǎn)了Claudin-5和occludin減少[37]。
3.2 中藥注射劑
中藥注射劑是中醫(yī)治療的常用劑型。在腦卒中局灶性栓塞造模后4.5 h給予丹紅注射液聯(lián)合tPA治療,降低了血腦屏障通透性、MMP-9、纖溶酶原激活物抑制物-1(PAI-1)和p-選擇素表達(dá),上調(diào)Claudin-5、occludin和ZO-1,認(rèn)為是通過激活Notch-VEGF信號通路,促進(jìn)血管生成,減小腦梗死面積,減輕出血轉(zhuǎn)化[38]。tPA溶栓聯(lián)合銀杏葉注射液可防止血小板聚集,保護(hù)血管內(nèi)皮功能和血腦屏障完整性,提高病人神經(jīng)功能預(yù)后恢復(fù),結(jié)果顯示,治療組總有效率為97.96%,高于對照組的83.67%(P<0.05)[39]。董海等[40]在124例臨床溶栓病人中觀察發(fā)現(xiàn),醒腦靜注射液使用14 d可降低tPA不良反應(yīng),改善病人神經(jīng)功能缺損,總有效率為96.77%,高于對照組的85.48%(P<0.05)。益氣復(fù)脈凍干注射液是生脈散的乙醇提取物,與tPA聯(lián)合使用可減小MCAO大鼠梗死體積,減輕腦水腫和血腦屏障破壞,同時(shí)抑制了NF-κB、MMP-2和MMP-9活性,上調(diào)TJP和抗炎因子表達(dá),保護(hù)血腦屏障的完整性[41]。
3.3 中成藥
中成藥以中藥為原材料,經(jīng)特殊工藝制作改良,因儲存方便,適應(yīng)急需的特點(diǎn)在臨床普遍應(yīng)用。喬天慈等[42]64例氣虛血瘀急性腦梗死病人的臨床觀察,選用靜脈溶栓的對照組基礎(chǔ)上加炙黃芪-水蛭顆粒,療程14 d,結(jié)果顯示,顆粒組減少了出血轉(zhuǎn)化,降低了腦梗死再發(fā)概率,且溶栓后14、90 d神經(jīng)功能改善優(yōu)于對照組。劉濤等[43]80例痰熱腑實(shí)急性腦梗死病人研究顯示,在tPA對照組基礎(chǔ)上給予麝香四黃顆粒治療,療程14 d,第7天、第14天,顆粒組低密度脂蛋白膽固醇(LDL-C)水平顯著降低(P<0.05)。
3.4 中藥復(fù)方
藥物經(jīng)君臣佐使配伍組成復(fù)方,協(xié)同作用發(fā)揮最大療效。安宮牛黃丸在腦梗死大鼠模型中聯(lián)合tPA,清除了過氧亞硝酸鹽和超氧化物活性,通過抑制MMP-9釋放提高了緊密連接蛋白Claudin-5和膠原Ⅳ表達(dá),減少腦出血[44]。桃紅四物湯聯(lián)合tPA顯著降低了缺氧誘導(dǎo)因子(HIF)-1α、TNF-α和iNOS表達(dá),減小腦梗死體積[45]。朱云波等[46]在對照基礎(chǔ)上聯(lián)合血府逐瘀湯治療122例急性腦梗死病人,與對照組相比,MMP-3水平降低,且治療后美國國立衛(wèi)生研究院卒中量表(NIHSS)有效率優(yōu)于對照組(P<0.05),其機(jī)制與提高基質(zhì)金屬蛋白酶抑制劑(TIMP)-1活性、降低MMP-3活性有關(guān)。有研究給予腦梗死大鼠血府逐瘀湯,明顯降低了tPA介導(dǎo)的TNF-α、iNOS、HIF-1活性和Caspase-3表達(dá)及實(shí)驗(yàn)大鼠腦水腫和出血轉(zhuǎn)化發(fā)生率[47]。芪參益氣方聯(lián)合4.5 h的tPA治療降低了氯化鐵誘導(dǎo)的頸動(dòng)脈血栓小鼠的Caveolin-1與MMPs水平,減少小鼠occludin、Claudin-5和基底膜破壞、白細(xì)胞黏附及白細(xì)胞浸潤,改善了神經(jīng)元死亡和出血轉(zhuǎn)化[48]。有研究證實(shí)其成分中的黃芪、丹參、三七提取物按5∶4∶1(T541)比例調(diào)配,單獨(dú)或任意組合均可發(fā)揮腦保護(hù)作用,3種成分聯(lián)合使用可減少延遲tPA引起的血管性水腫和出血[49]。
3.5 針灸
針灸通過作用體表疏通經(jīng)絡(luò),在急癥治療中可快速顯效,效果不亞于藥物治療,針灸與藥物結(jié)合在臨床治療中廣泛應(yīng)用。宋揚(yáng)揚(yáng)[50]將SD大鼠分為假手術(shù)組、模型組、4.5 h溶栓組、針刺+4.5 h溶栓組,觀察醒腦開竅針刺對靜脈溶栓的影響,結(jié)果顯示,針刺聯(lián)合溶栓顯著降低了大鼠腦梗死體積和行為學(xué)評分,保護(hù)了血腦屏障結(jié)構(gòu)蛋白,減少了出血轉(zhuǎn)化(P<0.01),證實(shí)了針灸通過抑制RhoA/ROCK信號通路途徑、提高了腦梗死大鼠延遲溶栓安全性。常思琦[51]動(dòng)物研究顯示,針刺通過促血管新生減輕腦水腫和出血轉(zhuǎn)化,提高靜脈溶栓安全性。姜思媛[52]研究顯示,針刺介入提高SD大鼠6 h溶栓的安全性,保護(hù)血腦屏障完整,減輕腦水腫(P<0.05)。
4 小結(jié)與展望
中醫(yī)藥在抗氧化、抗炎、促進(jìn)血管生成等多項(xiàng)機(jī)制研究中,均顯示了對MMPs,尤其是MMP-9的抑制作用,保護(hù)血腦屏障同時(shí)減少出血轉(zhuǎn)化,體現(xiàn)了中醫(yī)藥多靶點(diǎn)阻止出血轉(zhuǎn)化發(fā)生和神經(jīng)保護(hù)優(yōu)勢。在丹紅注射液的研究中,tPA組用量為5 mg/kg,中藥聯(lián)合組中tPA劑量減少一半,顯示出較好的溶栓效果[38],雖然該研究中未設(shè)計(jì)tPA 5 mg/kg對照,但可說明中藥在增加溶栓效果同時(shí)減少了tPA用量。一項(xiàng)Meta分析系統(tǒng)評價(jià)了中藥參與tPA溶栓的安全性和有效性[53]。關(guān)于中藥減輕tPA不良反應(yīng)的研究發(fā)現(xiàn),通竅活血湯[54]、補(bǔ)陽還五湯[55]等在保護(hù)血腦屏障和減輕出血方面療效確切,盡管這些藥物未與tPA溶栓進(jìn)行對照研究,但研究者認(rèn)為這些藥物存在tPA輔助應(yīng)用價(jià)值。
中醫(yī)藥減少血腦屏障通透性和降低出血轉(zhuǎn)化作用明確,但存在幾個(gè)問題:1)目前臨床觀察中藥效果明確,但機(jī)制報(bào)道較少,在動(dòng)物實(shí)驗(yàn)的機(jī)制探索處于發(fā)展上升階段,臨床研究與實(shí)驗(yàn)機(jī)制研究相互印證、協(xié)同發(fā)展仍需進(jìn)一步探索。2)關(guān)于tPA引起出血的中醫(yī)理論報(bào)道較少,如何從中醫(yī)辨證論治闡明中醫(yī)藥在血腦屏障保護(hù)、減少出血應(yīng)用理論方面有待明確。3)急性腦梗死病情危急、變化快,中藥復(fù)方雖有一定療效,但在有限時(shí)間窗內(nèi),符合臨床需求療效確切的針劑較少。因此,中藥復(fù)方在后期臨床研究中需結(jié)合現(xiàn)代先進(jìn)工藝技術(shù)發(fā)揮更優(yōu)的療效。4)針灸應(yīng)用tPA溶栓治療有確切療效,但現(xiàn)有報(bào)道多為MCAO模型動(dòng)物的醒腦開竅固定穴位的針刺研究,研究形式單一,資料尚少,仍待進(jìn)一步開發(fā)探索。5)個(gè)別實(shí)驗(yàn)認(rèn)為中藥增加了延遲tPA溶栓時(shí)間,文獻(xiàn)中以3 h后注射tPA為延遲溶栓,與國際公認(rèn)4.5 h有所偏差,多數(shù)文獻(xiàn)聯(lián)合中藥、tPA給藥,但未記錄詳細(xì)具體tPA給藥時(shí)間,時(shí)間未統(tǒng)一標(biāo)準(zhǔn)。6)臨床研究試驗(yàn)中缺乏盲法、對照設(shè)計(jì),未體現(xiàn)研究的科學(xué)性和規(guī)范性,影響了文獻(xiàn)參考可信度。今后需要使用更多科學(xué)技術(shù)手段加強(qiáng)中醫(yī)藥對tPA溶栓研究,闡明其分子機(jī)制,嚴(yán)格規(guī)范溶栓時(shí)間標(biāo)準(zhǔn)和試驗(yàn)設(shè)計(jì)等操作,使中醫(yī)藥研究發(fā)展更規(guī)范、科學(xué),為臨床提供科學(xué)、規(guī)范的實(shí)驗(yàn)標(biāo)準(zhǔn),提供安全的溶栓治療。
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(收稿日期:2023-01-17)
(本文編輯薛妮)