[摘要]"骨質(zhì)疏松癥是2型糖尿病最常見(jiàn)的并發(fā)癥之一,發(fā)病率逐年升高已引發(fā)社會(huì)廣泛關(guān)注。骨質(zhì)疏松可導(dǎo)致骨脆性和骨折易感性增加,是糖尿病患者生活質(zhì)量下降的主要原因,也是致殘率居高不下的主因之一。近年來(lái)大量國(guó)內(nèi)外文獻(xiàn)研究表明藥物治療對(duì)糖尿病合并骨質(zhì)疏松癥具有較好的治療作用,本文就藥物治療對(duì)糖尿病合并骨質(zhì)疏松癥患者的臨床療效進(jìn)行綜述。
[關(guān)鍵詞]"2型糖尿病;骨質(zhì)疏松癥;藥物治療
[中圖分類號(hào)]"R587.1""""""[文獻(xiàn)標(biāo)識(shí)碼]"A""""""[DOI]"10.3969/j.issn.1673-9701.2025.06.032
2型糖尿病(type"2"diabetes"mellitus,T2DM)主要特征為胰島素分泌不足和血糖升高,隨病程進(jìn)展可引發(fā)多系統(tǒng)損害,造成神經(jīng)、血管、骨骼等逐漸出現(xiàn)病理變化[1]。骨質(zhì)疏松(osteoporosis,OP)是T2DM的常見(jiàn)并發(fā)癥,是一種骨微結(jié)構(gòu)破壞引起的骨密度(bone"mineral"density,BMD)和質(zhì)量降低的代謝性骨病,涉及骨細(xì)胞吸收、形成功能失衡[2]。
OP相關(guān)骨折嚴(yán)重影響老年人的生活質(zhì)量。因此迫切需要了解降糖藥物影響骨代謝的不同機(jī)制。本文綜述降糖藥物對(duì)糖尿病合并OP的作用機(jī)制和研究進(jìn)展,為未來(lái)探索更高效的防治手段提供參考。
1""發(fā)病機(jī)制
T2DM并發(fā)OP的發(fā)病機(jī)制錯(cuò)綜復(fù)雜,目前明確的機(jī)制主要包括以下幾點(diǎn)。
1.1""高血糖毒性
高血糖直接抑制骨細(xì)胞活性,導(dǎo)致成骨細(xì)胞增殖能力降低并增加凋亡;減少成骨細(xì)胞趨化性,使骨微結(jié)構(gòu)礦化不均勻[3]。持久的高血糖狀態(tài)提高成骨細(xì)胞內(nèi)活性氧水平,抑制堿性磷酸酶(alkaline"phosphatase,ALP)活性,最終減弱骨細(xì)胞活力。此外,高血糖狀態(tài)可引發(fā)晚期糖基化終產(chǎn)物(advanced"glycation"end"products,AGEs)異常蓄積,不僅抑制成骨細(xì)胞分化,還可促進(jìn)生成骨吸收因子[4]。
1.2""胰島素因素
骨組織的生長(zhǎng)、分化受胰島素及其受體的影響和調(diào)節(jié)。正常情況下,胰島素刺激成骨細(xì)胞表面受體激活信號(hào)通路并刺激細(xì)胞DNA合成,誘導(dǎo)細(xì)胞增殖,促進(jìn)骨鈣素和膠原蛋白合成[5]。胰島素樣生長(zhǎng)因子1(insulin-like"growth"factor"1,IGF-1)同樣對(duì)成骨細(xì)胞產(chǎn)生影響,通過(guò)抑制骨膠原降解和促進(jìn)骨基質(zhì)礦化促進(jìn)成骨、維持BMD[6]。
1.3""腎臟病變
糖尿病腎病致腎小球?yàn)V過(guò)功能改變。一方面,尿糖上升和滲透壓增加加快鈣、磷排泄,導(dǎo)致血鈣濃度降低;另一方面,高血糖抑制腎小管離子的再吸收,導(dǎo)致鈣、磷、鎂代謝失衡,進(jìn)一步刺激甲狀旁腺激素(parathyroid"hormone,PTH)分泌,加重骨質(zhì)流失和強(qiáng)度下降[7]。此外,腎臟病變致血肌酐上升,對(duì)1α-羥化酶水平的影響抑制活性維生素D合成,減少腸道鈣吸收和骨合成[8]。
1.4""代謝紊亂
糖尿病代謝紊亂影響糖脂穩(wěn)態(tài),血脂水平與骨折風(fēng)險(xiǎn)相關(guān)。Patsch等[9]研究發(fā)現(xiàn)骨髓脂肪成分改變與脆性骨折和糖尿病有關(guān),脂肪組織釋放脂肪因子和增加骨轉(zhuǎn)換的炎癥因子影響骨細(xì)胞調(diào)節(jié)骨形成。此外,代謝紊亂還導(dǎo)致微量元素及礦物質(zhì)失衡,加劇骨吸收,加速OP。
1.5""炎癥反應(yīng)
高糖環(huán)境可激活多種信號(hào)通路,并產(chǎn)生炎性因子、AGEs等,加劇體內(nèi)炎癥反應(yīng)。炎性細(xì)胞因子不僅可刺激骨髓中破骨細(xì)胞前體的增殖、分化及成熟,加速骨吸收,如腫瘤壞死因子-α(tumor"necrosis"factor-α,TNF-α)[10];還可引起細(xì)胞內(nèi)氧化應(yīng)激。在生理?xiàng)l件下,活性氧參與細(xì)胞內(nèi)信號(hào)傳導(dǎo)并維持細(xì)胞生理功能。然而,高血糖、AGEs和炎癥導(dǎo)致細(xì)胞內(nèi)活性氧異常增加,胰島素分泌及表達(dá)下降,進(jìn)而減少骨形成[11]。
2""藥物治療
T2DM合并OP的治療旨在控制血糖、增加BMD,降低骨折風(fēng)險(xiǎn)。單一OP藥物治療可能無(wú)法達(dá)到預(yù)期效果,因此需考慮聯(lián)合降糖藥物治療。
2.1""雙胍類
二甲雙胍(metformin,MF)是臨床上廣泛使用的雙胍類藥物,可改善胰島素敏感度、提高葡萄糖代謝率、降低血糖[12]。Zheng等[13]研究通過(guò)激活腺苷5'-單磷酸活化蛋白激酶(AMP-activated-protein-"kinase,AMPK)減弱過(guò)氧化物酶體增殖物活化受體-γ(peroxisome"proliferator-activated"receptor"γ,PPARγ)活性,促進(jìn)成骨細(xì)胞分化、增殖及相關(guān)成骨因子的表達(dá)。一項(xiàng)臨床隨機(jī)對(duì)照研究顯示,將MF的日劑量提高3個(gè)月后,T2DM老年男性的腰椎和髖部BMD顯著增加[14]。另一項(xiàng)Meta分析發(fā)現(xiàn)MF治療可降低T2DM患者的骨折風(fēng)險(xiǎn)[15]。盡管部分骨折影響的數(shù)據(jù)存在矛盾,但負(fù)性結(jié)果數(shù)據(jù)較少,不具有普遍性。
2.2""胰高血糖素樣肽-1激動(dòng)劑
胰高血糖素樣肽-1(glucagon-like"peptide-1,GLP-1)可有效控制血糖,具有低風(fēng)險(xiǎn)且治療窗寬的特點(diǎn),是近年關(guān)注的新藥[16]。GLP-1對(duì)骨骼有積極影響,通過(guò)與胰島β細(xì)胞上的GLP-1受體結(jié)合,刺激胰島素分泌,增強(qiáng)骨代謝調(diào)控。GLP-1受體還介導(dǎo)BMSCs向成骨分化,為骨骼修復(fù)與重建提供重要支持[17]。Xie等[18]研究發(fā)現(xiàn)GLP-1激動(dòng)劑增加骨密度的同時(shí)可有效維護(hù)骨健康。GLP-1可有效緩解臨床癥狀,顯著降低骨折等嚴(yán)重并發(fā)癥風(fēng)險(xiǎn),為患者長(zhǎng)期健康提供有力保障。
2.3""鈉-葡萄糖協(xié)同轉(zhuǎn)運(yùn)蛋白2
鈉–葡萄糖協(xié)同轉(zhuǎn)運(yùn)蛋白2(sodium-dependent"glucose"transporters"2,SGLT-2)抑制劑通過(guò)阻斷葡萄糖轉(zhuǎn)運(yùn)蛋白,減少腎臟葡萄糖重吸收并促進(jìn)其排泄,可獨(dú)立于胰島素作用之外降低血糖[19]。SGLT-2抑制劑可調(diào)節(jié)骨代謝,但機(jī)制尚存爭(zhēng)議。SGLT-2在高糖環(huán)境下維持胰島功能,保護(hù)胰島β細(xì)胞免受過(guò)度刺激,有利于發(fā)揮胰島素對(duì)骨代謝的正向作用[20]。但SGLT-2抑制劑有可能引起滲透性利尿及直立性低血壓,導(dǎo)致脫水并增加跌倒和骨折風(fēng)險(xiǎn)。
趙宇潔等[21]納入100例老年糖尿病患者的研究發(fā)現(xiàn),SGLT-2組患者與非SGLT-2組患者治療后的BMD無(wú)顯著差異,表明SGLT-2對(duì)OP影響不大。Lee等[22]開(kāi)展的隊(duì)列研究顯示,SGLT-2抑制劑較其他降糖藥物更易加劇椎骨骨折風(fēng)險(xiǎn),尤其是對(duì)老年女性患者。總之,SGLT-2抑制劑與骨折風(fēng)險(xiǎn)增加無(wú)顯著相關(guān)性,但需謹(jǐn)慎使用以防骨健康潛在風(fēng)險(xiǎn)。
2.4""磺酰脲類
磺酰脲類降血糖藥物通過(guò)與胰島β細(xì)胞上的磺酰脲類受體結(jié)合促進(jìn)胰島素分泌,快速有效降低血糖,安全性良好[23]。磺酰脲類藥物對(duì)OP的影響存在爭(zhēng)議;其可激活磷脂酰肌醇-3激酶通路,增加成骨細(xì)胞增殖分化[24];但亦可加速骨代謝相關(guān)酶作用,增加骨鈣鹽的流失,加快OP發(fā)生。Tsai等[25]在一項(xiàng)納入161項(xiàng)研究的Meta分析中發(fā)現(xiàn),磺酰脲類較安慰劑具有更好的骨折保護(hù)效果,效果優(yōu)于噻唑烷二酮類(thiazolidinedione,TZD)及二肽基肽酶4(dipeptidyl"peptidase"4,DPP-4)抑制劑。然而,Zhang等[26]研究顯示磺酰脲類藥物可增加T2DM患者骨折概率。需注意的是,多數(shù)研究認(rèn)為磺酰脲類藥物對(duì)骨代謝呈中性,但老年患者用藥后低血糖風(fēng)險(xiǎn)較高,易導(dǎo)致跌倒和骨折。磺酰脲類藥物對(duì)骨代謝影響的臨床研究較少,需嚴(yán)格掌控適應(yīng)證后使用。
2.5""TZD
TZD是口服降糖藥,其作用機(jī)理涉及PPARγ,可增強(qiáng)外周組織對(duì)胰島素的敏感度[27]。TZD作為PPARγ家族核受體的選擇性激動(dòng)劑,主要通過(guò)活化PPARγ抑制成骨細(xì)胞分化并增加骨調(diào)節(jié)蛋白的生成[28]。此外,PPARγ的激活還影響骨代謝相關(guān)激素、細(xì)胞因子水平,對(duì)骨組織產(chǎn)生間接負(fù)面影響。動(dòng)物實(shí)驗(yàn)表明TZD可促進(jìn)小鼠破骨細(xì)胞形成,導(dǎo)致骨質(zhì)丟失并損害骨微結(jié)構(gòu)。該類藥物增加骨折風(fēng)險(xiǎn),并降低腰椎、全髖部和前臂BMD[29]。一項(xiàng)關(guān)于吡格列酮的Meta分析表明,TZD可顯著降低髖關(guān)節(jié)和腰椎等部位BMD[30]。目前,多數(shù)證據(jù)表明TZD對(duì)骨骼有破壞作用,尤其是對(duì)女性及骨折風(fēng)險(xiǎn)較高的患者,應(yīng)謹(jǐn)慎使用。
2.6""DPP-4抑制劑
DPP-4抑制劑可結(jié)合二肽基肽酶的活性部位,短時(shí)間內(nèi)抑制DPP-4活性,從而提高GLP水平,刺激胰島素釋放,實(shí)現(xiàn)降低血糖的效果[31]。DPP-4抑制劑通過(guò)提升機(jī)體內(nèi)GLP-1的濃度,對(duì)骨代謝產(chǎn)生積極影響[32]。GLP-1可刺激成骨細(xì)胞的增殖,并顯著降低骨鈣的吸收速度,有效維護(hù)骨形成過(guò)程。Huang等[33]進(jìn)行的Meta分析顯示,接受DPP-4抑制劑治療的患者BMD有所上升,且OP風(fēng)險(xiǎn)降低。中國(guó)臺(tái)灣開(kāi)展的回顧性隊(duì)列研究表明,DPP-4抑制劑藥物可預(yù)防骨折,且效果與累計(jì)劑量呈正相關(guān)[34]。由此可見(jiàn),DPP-4抑制劑可有效改善患者的骨代謝水平,為糖尿病合并OP的治療提供新選擇。
2.7""胰島素
胰島素與骨質(zhì)及軟骨的形成密切相關(guān)。胰島素與成骨細(xì)胞上的胰島素受體結(jié)合后,展現(xiàn)出促進(jìn)骨合成的代謝作用;即成骨細(xì)胞與胰島素受體底物-1及胰島素受體底物-2相互作用,激發(fā)骨生成過(guò)程[35]。盡管胰島素被認(rèn)為可促進(jìn)骨組織的合成代謝,但目前并未觀察到胰島素對(duì)OP有明顯改善作用,甚至一些研究顯示其可能增加骨折風(fēng)險(xiǎn)。Zhang等[36]進(jìn)行的Meta分析發(fā)現(xiàn),接受胰島素治療的患者OP性骨折的風(fēng)險(xiǎn)更高,但這一結(jié)果受多因素影響。一項(xiàng)對(duì)比MF、胰島素和磺酰脲類藥物的觀察性研究顯示,除MF外,其余兩組藥物均增加髖部骨折風(fēng)險(xiǎn)[37]。使用胰島素的患者病程更長(zhǎng)和(或)血糖控制較差,并伴有并發(fā)癥,進(jìn)一步增加骨折風(fēng)險(xiǎn)。若能積極預(yù)防低血糖的發(fā)生,胰島素治療可帶來(lái)雙重益處。
3""小結(jié)
糖尿病合并OP給患者帶來(lái)沉重負(fù)擔(dān)。及早干預(yù)、控制病程已成為臨床治療的重中之重。這不僅關(guān)乎患者的健康狀況,更對(duì)其未來(lái)的生活質(zhì)量產(chǎn)生深遠(yuǎn)影響。本綜述闡釋疾病的發(fā)病機(jī)制,總結(jié)分析相關(guān)藥物特點(diǎn),旨在為未來(lái)預(yù)防和個(gè)體化治療提供新的思路,提高治療效果并減少不良反應(yīng)。
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:2024–08–11)
(修回日期:2025–02–13)