[摘要]"膝骨關(guān)節(jié)炎(knee"osteoarthritis,KOA)是一種常見的以膝關(guān)節(jié)發(fā)生退行性改變?yōu)榛A(chǔ)的關(guān)節(jié)疾病,并伴隨有半月板損傷、滑膜炎癥、髕骨軟化、韌帶損傷等,目前KOA的確切發(fā)病機(jī)制尚未明確?;|(zhì)金屬蛋白酶–9(matrix"metalloproteinase–9,MMP–9)及其特異性抑制劑組織金屬蛋白酶抑制物可降解細(xì)胞外基質(zhì),在KOA進(jìn)程中發(fā)揮重要作用。本文旨在探討MMP–9在KOA中的作用機(jī)制,并分析其作為治療靶點(diǎn)的潛力,綜合分析中醫(yī)藥對(duì)MMP–9的調(diào)控作用。
[關(guān)鍵詞]"膝骨關(guān)節(jié)炎;基質(zhì)金屬蛋白酶–9;軟骨降解;中醫(yī)藥
[中圖分類號(hào)]"R274.9""""""[文獻(xiàn)標(biāo)識(shí)碼]"A""""""[DOI]"10.3969/j.issn.1673-9701.2025.13.025
膝骨關(guān)節(jié)炎(knee"osteoarthritis,KOA)是骨關(guān)節(jié)炎(osteoarthritis,OA)的常見形式,有較高的發(fā)病率和致殘率,且患病率隨著人口老齡化和預(yù)期壽命的增長(zhǎng)逐年上升[1]。KOA的發(fā)病機(jī)制復(fù)雜,涉及滑膜炎癥、軟骨及軟骨下骨退變、關(guān)節(jié)炎癥、血管生成、骨質(zhì)增生等,肥胖、年齡、創(chuàng)傷等因素可通過多種途徑加劇滑膜炎癥、軟骨退變和骨重塑等病理過程,最終導(dǎo)致關(guān)節(jié)疼痛、僵硬和活動(dòng)障礙,嚴(yán)重影響患者的日常生活功能[2]。KOA發(fā)病時(shí)促炎與抗炎介質(zhì)分泌失衡,導(dǎo)致軟骨降解或變性,骨重塑(骨贅形成)或其他炎性改變(滑膜炎)最終使關(guān)節(jié)內(nèi)的形態(tài)學(xué)改變[3-4]。機(jī)械負(fù)荷可通過激活Hippo信號(hào)通路激活核因子–κB(nuclear"factor–κB,NF–κB)信號(hào)通路,誘導(dǎo)炎癥和細(xì)胞外基質(zhì)(extracellular"matrix,ECM)降解[5]。近年來研究發(fā)現(xiàn)某些基質(zhì)金屬蛋白酶(matrix"metalloproteinase,MMP)特別是MMP–9及其特異性抑制劑組織金屬蛋白酶抑制物(tissue"inhibitor"of"metalloproteinase–1,TIMP–1)對(duì)KOA的發(fā)生發(fā)展有重要影響[6]。本文旨在探討MMP–9在KOA發(fā)生發(fā)展中的作用機(jī)制,并深入分析MMP–9作為治療靶點(diǎn)的潛力,評(píng)估中醫(yī)藥對(duì)MMP–9的調(diào)控作用,為未來KOA的治療研究提供參考。
1""MMP-9的結(jié)構(gòu)與功能調(diào)節(jié)
MMP–9是一種重要的MMP,在軟骨降解和關(guān)節(jié)炎癥中發(fā)揮重要作用,可降解各種ECM成分,如膠原蛋白、蛋白聚糖和彈性蛋白,導(dǎo)致軟骨退化和破壞[7]。MMP家族包括膠原酶、明膠酶、基質(zhì)溶素和膜型MMP等,可降解ECM各種蛋白組分,參與炎癥細(xì)胞引起的組織破壞,還作為效應(yīng)分子參與炎癥反應(yīng)[8-9]。MMP–9又稱明膠酶B,是明膠酶的主要成分之一,可調(diào)節(jié)ECM重塑,參與骨重塑過程[10-11]。
生理?xiàng)l件下MMP/TIMP的相對(duì)平衡是ECM降解的關(guān)鍵。TIMP–1通過與MMP–9前體形成復(fù)合物抑制其活化;或與激活后的MMP–9結(jié)合,使其失去活性[12]。MMP水平升高及與TIMP之間的動(dòng)態(tài)失衡是KOA發(fā)病的重要機(jī)制[13]。
2""MMP-9誘發(fā)和加重KOA的作用機(jī)制
MMP–9作為參與KOA進(jìn)程的關(guān)鍵蛋白水解酶,其表達(dá)失調(diào)直接影響軟骨基質(zhì)成分的平衡,過度表達(dá)可促進(jìn)Ⅱ型膠原的降解,破壞關(guān)節(jié)軟骨ECM的合成與降解之間的平衡,并與KOA的發(fā)病機(jī)制密切相關(guān)。此外,MMP–1、MMP–2等其他MMP的過度表達(dá)也可能參與KOA的進(jìn)程。
2.1""軟骨降解
MMP–9可通過多種途徑參與軟骨降解過程。""①能夠直接降解Ⅱ型膠原和蛋白聚糖,導(dǎo)致軟骨的退化和破壞[14];②通過蛋白水解的方式,激活其他MMP,如激活MMP–13啟動(dòng)軟骨降解,或激活炎癥信號(hào)通路(如NF–κB),增加軟骨破壞,協(xié)同加重軟骨的降解,破壞軟骨細(xì)胞功能,形成惡性循環(huán)[15];③在機(jī)械應(yīng)力作用下,激活促分裂原活化的蛋白質(zhì)激酶(mitogen-activated"protein"kinase,MAPK)、NF–κB和Wnt信號(hào)通路來調(diào)節(jié)MMP–9的表達(dá)和活性,促進(jìn)ECM降解,同時(shí),軟骨的力學(xué)特性改變,增加關(guān)節(jié)對(duì)機(jī)械應(yīng)力的敏感度,加劇機(jī)械應(yīng)力對(duì)軟骨的損傷,促進(jìn)KOA的發(fā)展[16];④遺傳因素可影響MMP–9的表達(dá)水平、活性及對(duì)機(jī)械應(yīng)力的敏感度,從而影響KOA的發(fā)生發(fā)展[17]。如攜帶MMP–9-1562T等位基因的個(gè)體,MMP–9表達(dá)和活性增加,KOA風(fēng)險(xiǎn)增加[18]。攜帶-66T等位基因的個(gè)體,TIMP–1表達(dá)和活性降低,削弱對(duì)MMP的抑制作用,加速軟骨降解。此外,MMP–9和TIMP–1的基因多態(tài)性破壞MMP/TIMP的平衡,加劇KOA的發(fā)展。
2.2""炎癥反應(yīng)
MMP–9可通過激活NF–κB、MAPK信號(hào)通路促進(jìn)炎癥介質(zhì)如白細(xì)胞介素–1β(interleukin–1β,IL–1β)和腫瘤壞死因子–α(tumour"necrosis"factor–α,TNF–α)釋放,促進(jìn)關(guān)節(jié)腔內(nèi)的炎癥反應(yīng)[19-20]。同時(shí)MMP–9也參與招募免疫細(xì)胞,釋放更多炎癥因子,進(jìn)一步促進(jìn)軟骨降解和骨質(zhì)破壞,加重KOA的炎癥反應(yīng)[21-22]。此外,IL–1β、TNF–α等主要炎癥因子又可促進(jìn)軟骨細(xì)胞和滑膜細(xì)胞中的MMP–9表達(dá),形成正反饋循環(huán),加劇KOA的炎癥反應(yīng)。
2.3""血管生成
MMP–9可促進(jìn)血管生成。一方面,MMP–9通過調(diào)控MAPK和磷脂酰肌醇3激酶/蛋白激酶B等信號(hào)通路,刺激血管內(nèi)皮生長(zhǎng)因子表達(dá),促進(jìn)血管內(nèi)皮細(xì)胞的增殖、遷移和管腔形成,提供新生血管的形成途徑[23-24];另一方面,MMP–9影響生長(zhǎng)因子如骨形態(tài)發(fā)生蛋白(bone"morphogenetic"protein,BMP)、轉(zhuǎn)化生長(zhǎng)因子–β和成纖維細(xì)胞生長(zhǎng)因子的活性,從而影響骨重塑及軟骨細(xì)胞的增殖、分化和代謝,加劇軟骨的降解和骨質(zhì)破壞,并在KOA進(jìn)程中加劇炎癥反應(yīng)[25-26]。在KOA進(jìn)程中,血管生成導(dǎo)致炎癥細(xì)胞浸潤(rùn)和炎癥因子釋放增加,加劇關(guān)節(jié)炎癥;新生血管又為關(guān)節(jié)腔提供更多的血液供應(yīng),進(jìn)一步加重軟骨降解和骨質(zhì)破壞。
2.4""骨重塑
MMP–9參與骨重塑,既可促進(jìn)骨形成,也可促進(jìn)骨吸收[27]。①促進(jìn)骨形成:MMP–9通過降解基質(zhì),釋放生長(zhǎng)因子,激活骨祖細(xì)胞,提供充足的血液供應(yīng);同時(shí)調(diào)控骨骼發(fā)育相關(guān)的Wnt和BMP信號(hào)通路,促進(jìn)骨形成[28]。②促進(jìn)骨吸收:MMP–9激活破骨細(xì)胞,降解包括Ⅰ型膠原蛋白在內(nèi)的骨基質(zhì),促進(jìn)破骨細(xì)胞的附著和骨吸收;并調(diào)控骨骼重塑相關(guān)的NF–κB受體激活蛋白配體/NF–κB受體激活蛋白/護(hù)骨因子信號(hào)通路,促進(jìn)骨吸收[29]。在KOA中,MMP–9活性的增加可促進(jìn)骨吸收和骨贅形成,加重癥狀。
MMP–9由關(guān)節(jié)軟骨中的單核細(xì)胞和巨噬細(xì)胞分泌,其表達(dá)水平與KOA的嚴(yán)重程度呈正相關(guān),并隨著軟骨磨損加重而升高。MMP–9可降解α1抗胰蛋白酶,保持中性粒細(xì)胞彈性蛋白酶活性,加強(qiáng)MMP-13活性,促進(jìn)炎癥進(jìn)展[30]。中性粒細(xì)胞彈性蛋白酶的水平和活性可反映疾病的狀態(tài)和嚴(yán)重程度。研究發(fā)現(xiàn)膿毒性膝關(guān)節(jié)炎中MMP–9表達(dá)顯著高于無菌性炎癥(風(fēng)濕性關(guān)節(jié)炎、OA),且感染性滲出液中的MMP–9/TIMP–1比值升高[31-32]。微陣列數(shù)據(jù)集分析發(fā)現(xiàn)MMP–9和Ⅲ型膠原蛋白α1鏈?zhǔn)荗A的潛在生物標(biāo)記物,其表達(dá)水平可被IL–1β上調(diào)[33]。大鼠糖尿病OA模型中,關(guān)節(jié)腔內(nèi)MMP–9的過度表達(dá)加重病理形態(tài)學(xué)變化[34]。TNF–α和前列腺素E2均能使MMP–9表達(dá)升高,MMPs/TIMP–1比例失衡,加重軟骨基質(zhì)破壞,參與KOA的進(jìn)程[32]。
3""MMP-9在KOA中的研究進(jìn)展及中醫(yī)藥調(diào)控
3.1""MMP-9的表達(dá)水平
血清中的MMP–9主要來源于軟骨、滑膜及血管內(nèi)皮細(xì)胞等,其水平升高反映機(jī)體軟骨降解和炎癥反應(yīng)的活躍程度。研究表明KOA患者關(guān)節(jié)液中MMP–9的含量明顯高于正常人,且KOA越嚴(yán)重,關(guān)節(jié)液中MMP–9的含量越高[35]。在KOA早期階段,軟骨組織中MMP–9表達(dá)開始上調(diào),并隨著KOA的進(jìn)展不斷加重,形成惡性循環(huán),進(jìn)一步加速軟骨降解。同時(shí),滑膜組織中的MMP–9水平也顯著升高,進(jìn)一步加重滑膜炎癥,促進(jìn)軟骨降解。因此,MMP-9表達(dá)水平可作為KOA診斷和預(yù)后評(píng)估的參考標(biāo)準(zhǔn),但仍需更多臨床研究驗(yàn)證。
3.2""MMP-9在KOA中的中醫(yī)藥調(diào)控
中醫(yī)藥在KOA的防治中展現(xiàn)出獨(dú)特的優(yōu)勢(shì),強(qiáng)調(diào)從整體出發(fā),調(diào)整機(jī)體陰陽平衡和氣血運(yùn)行,改善關(guān)節(jié)微環(huán)境,抑制軟骨降解。研究發(fā)現(xiàn)中醫(yī)藥可通過多種途徑干預(yù)MMP–9的表達(dá)和活性,防治KOA。①抑制MMP–9表達(dá):活血化瘀類中藥丹參、紅花等通過抑制MMP–9表達(dá)減緩軟骨基質(zhì)降解。丹參可通過抑制NF–κB信號(hào)通路激活,減少M(fèi)MP–9轉(zhuǎn)錄和表達(dá)[36];紅花的主要成分紅花黃素可調(diào)控NF–κB和MAPK信號(hào)通路,降低MMP–9表達(dá)[37]。清熱解毒類中藥金銀花、蒲公英等可抑制炎癥反應(yīng),抑制MMP–9表達(dá)。金銀花提取物可通過抑制TNF–α、IL–1β等促炎因子釋放,減少M(fèi)MP–9表達(dá)[38];蒲公英提取物可抑制巨噬細(xì)胞活化,減少炎癥細(xì)胞浸潤(rùn),降低MMP–9表達(dá)[39]。熟地黃、枸杞子等補(bǔ)肝腎的中藥可改善軟骨細(xì)胞代謝,抑制MMP–9表達(dá)[40]。黃芪提取物在體外干預(yù)實(shí)驗(yàn)中下調(diào)MMP–9表達(dá),減緩ECM分解,保護(hù)軟骨延緩KOA進(jìn)展[41]。②調(diào)節(jié)MMP–9的活性:一些中藥單體如姜黃素等可通過抑制血管生成和滑膜增生,調(diào)節(jié)相關(guān)信號(hào)通路,發(fā)揮保護(hù)軟骨下骨的作用[42];中藥提取物黃芪多糖等可抑制Toll樣受體4/NF–κB"p65信號(hào)通路激活,改善KOA的軟骨降解、氧化應(yīng)激和炎癥反應(yīng),減輕關(guān)節(jié)損傷[43]。中藥蠲痹膠囊可顯著降低兔血清中MMP–9含量,減少軟骨基質(zhì)降解,達(dá)到改善關(guān)節(jié)功能的目的[44]。
研究發(fā)現(xiàn)多種中藥成分如姜黃素、白藜蘆醇、熊果酸、丹皮酚、綠原酸等可通過抑制NF–κB、MAPK信號(hào)通路從而抑制MMP–9表達(dá)[45-48];此外,黃芪多糖、三七皂苷等可改善關(guān)節(jié)微環(huán)境、促進(jìn)軟骨細(xì)胞修復(fù)[49]。呂娜等[50]發(fā)現(xiàn)針刺聯(lián)合艾灸治療可降低KOA患者的MMP–9、TIMP–1含量和MMP–9/TIMP–1比值。然而,目前關(guān)于中醫(yī)藥對(duì)MMP–9調(diào)控作用的臨床研究仍較少,且樣本量有限,還需進(jìn)一步的研究驗(yàn)證這些結(jié)果。
4""MMP-9在KOA中的治療潛力
研究發(fā)現(xiàn)MMP–9/MMP–14軸可作為對(duì)骨損耗疾病狀態(tài)進(jìn)行干預(yù)的潛在靶標(biāo),靶向該軸可同時(shí)阻斷MMP–9的酶解作用和炎癥放大效應(yīng),為KOA提供多靶點(diǎn)治療策略[51]。針對(duì)MMP–9在KOA中的治療策略主要包括:①小分子抑制劑[52]:通過直接抑制MMP–9活性,減少軟骨基質(zhì)降解和緩解炎癥反應(yīng)。GM6001[53-54]、Marimastat和Batimastat等在體外實(shí)驗(yàn)中顯示出顯著的抑制作用,但臨床應(yīng)用中存在如骨骼肌疼痛和肝臟毒性等不良反應(yīng),中醫(yī)藥中的活性成分可通過調(diào)控MMP–9的轉(zhuǎn)錄或翻譯途徑,為開發(fā)低毒高效的抑制劑提供新思路。②單克隆抗體:MED13404可阻斷MMP–9活性及炎癥信號(hào)通路,目前還處于臨床試驗(yàn)階段,初步結(jié)果表明可緩解關(guān)節(jié)軟骨退化。聯(lián)合中醫(yī)藥的輔助作用可增強(qiáng)其療效并減輕不良反應(yīng)。③基因治療:使用反義寡核苷酸或siRNA沉默MMP–9表達(dá),從轉(zhuǎn)錄水平抑制其合成,可阻斷軟骨基質(zhì)降解。聯(lián)合中醫(yī)藥可增強(qiáng)基因載體的靶向性,提高其安全性。④生物抑制劑:如IL–1抑制劑和TNF–α抑制劑,阻斷炎癥因子信號(hào)通路可間接降低MMP–9表達(dá),中醫(yī)藥與之聯(lián)用可通過多途徑協(xié)同降低MMP–9表達(dá),增強(qiáng)治療效果。此外,中藥本身含有豐富的抗炎成分,多種傳統(tǒng)草藥和復(fù)方已被證實(shí)能有效降低MMP–9水平,其作用機(jī)制可能涉及調(diào)節(jié)炎癥反應(yīng)、促進(jìn)軟骨修復(fù)及抑制關(guān)節(jié)退變等多個(gè)方面,與非甾體抗炎藥和糖皮質(zhì)激素相比,中醫(yī)藥展現(xiàn)出更溫和且全面的治療特點(diǎn)[55]。未來需進(jìn)一步研究這些治療策略的有效性和安全性,并針對(duì)MMP–9開發(fā)更安全、更高效的抑制劑,同時(shí)可考慮聯(lián)合其他治療方法,如抗炎藥物、生長(zhǎng)因子等,達(dá)到更好的治療效果。
5""總結(jié)與展望
MMP–9在KOA的發(fā)生發(fā)展中發(fā)揮重要作用,是潛在的治療靶點(diǎn),針對(duì)MMP–9的治療策略如MMP–9抑制劑和基因治療有望為KOA患者帶來新的治療選擇。同時(shí),中醫(yī)藥在調(diào)控MMP–9方面具有獨(dú)特的優(yōu)勢(shì),未來可將MMP–9作為治療KOA的重要靶點(diǎn),結(jié)合中醫(yī)藥的優(yōu)勢(shì),開發(fā)更有效和精準(zhǔn)的治療方法。此外,還應(yīng)深入研究MMP–9在KOA病理生理學(xué)中的具體作用機(jī)制及與其他治療靶點(diǎn)之間的相互作用,并建立更有效的診斷和預(yù)后模型。
利益沖突:所有作者均聲明不存在利益沖突。
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(收稿日期:2024–12–26)
(修回日期:2025–04–17)