摘要:目的 探究帕金森?。≒D)患者血清硫氧還蛋白1(Trx1)、程序性細(xì)胞死亡因子4(PDCD4)、水通道蛋白4(AQP4)水平與認(rèn)知功能的關(guān)系。方法 選取145例PD患者(PD組)為研究對(duì)象,依據(jù)簡(jiǎn)易智能狀態(tài)檢查量表(MMSE)將患者分為認(rèn)知功能障礙(CI)組(43例)和無CI組(102例),再取同期105例健康者作為對(duì)照組。收集患者的臨床資料并進(jìn)行分析;酶聯(lián)免疫吸附試驗(yàn)檢測(cè)血清中Trx1、PDCD4、AQP4表達(dá);Pearson法分析PD患者血清中Trx1、PDCD4、AQP4水平與CI評(píng)分的相關(guān)性;多因素Logistic回歸分析PD患者發(fā)生CI的影響因素;受試者工作特征(ROC)曲線分析血清Trx1、PDCD4、AQP4水平對(duì)PD患者發(fā)生CI的預(yù)測(cè)價(jià)值。結(jié)果 PD組血清Trx1、AQP4水平低于對(duì)照組,PDCD4水平高于對(duì)照組(P<0.05)。CI組患者PD病程、PDCD4水平均高于無CI組(P<0.05),體質(zhì)量指數(shù)、受教育年限、MMSE評(píng)分、蒙特利爾認(rèn)知評(píng)估量表(MoCA)評(píng)分、Trx1、AQP4低于無CI組(P<0.05)。PD組患者血清Trx1、AQP4水平與MMSE、MoCA評(píng)分呈正相關(guān),血清PDCD4水平與MMSE、MoCA評(píng)分呈負(fù)相關(guān)(P<0.05)。PD病程長(zhǎng)、PDCD4水平升高是PD患者發(fā)生CI的危險(xiǎn)因素,Trx1、AQP4水平升高是PD患者發(fā)生CI的保護(hù)因素(P<0.05)。血清Trx1、PDCD4、AQP4水平以及聯(lián)合預(yù)測(cè)PD患者發(fā)生CI的曲線下面積(AUC)分別為0.820、0.741、0.831和0.932,聯(lián)合預(yù)測(cè)優(yōu)于各自單獨(dú)預(yù)測(cè)。結(jié)論 PD患者血清Trx1、AQP4、PDCD4與認(rèn)知功能密切相關(guān),三者聯(lián)合對(duì)PD患者發(fā)生CI的預(yù)測(cè)價(jià)值較高。
關(guān)鍵詞:帕金森??;認(rèn)知功能障礙;硫氧還蛋白質(zhì)類;凋亡調(diào)節(jié)蛋白質(zhì)類;水通道蛋白質(zhì)4;程序性細(xì)胞死亡因子4
中圖分類號(hào):R742 文獻(xiàn)標(biāo)志碼:A DOI:10.11958/20241632
Abstract: Objective To explore the relationship between serum thioredoxin 1 (Trx1), programmed cell death factor 4 (PDCD4), aquaporin 4 (AQP4) expression and cognitive function in patients with Parkinson's disease (PD). Methods A total of 145 PD patients (PD group) were selected as the study subjects, and patients were divided into the cognition impairment (CI) group 43 cases and the no CI group (102 cases) according to the mini-mental state examination (MMSE). Another 105 healthy subjects in the same period were taken as the control group. General patient data were collected and analyzed. The serum expression of Trx1, PDCD4 and AQP4 were detected by ELISA. The correlation between serum levels of Trx1, PDCD4 and AQP4 in PD patients and CI score were analyzed by Pearson method. Multivariate Logistic regression was used to analyze influencing factors of CI in PD patients. The predictive values of serum Trx1, PDCD4 and AQP4 levels for the occurrence of CI in PD patients were analyzed by receiver operating characteristic (ROC) curve. Results Serum levels of Trx1 and AQP4 were lower in the PD group than those of the control" group, and PDCD4 was higher in the PD group than that of the control group (P<0.05). In the CI group, PD duration and PDCD4 levels were higher than those of the no CI group (P<0.05), and BMI, years of education, MMSE score, MoCA score, Trx1 and AQP4 were lower than those in the no CI group (P<0.05). In the PD group, serum Trx1 and AQP4 levels were positively correlated with MMSE and MoCA scores, and serum PDCD4 levels were negatively correlated with MMSE and MoCA scores (P<0.05). The long course of disease and increased PDCD4 levels were risk factors for CI in PD patients, while increased Trx1 and AQP4 levels were protective factors for CI in PD patients (P<0.05). Serum Trx1, PDCD4, AQP4 levels and the combined AUC for predicting CI in PD patients were 0.820, 0.741, 0.831 and 0.932, respectively, and the combined prediction was better than the respective prediction alone. Conclusion Serum Trx1, AQP4 and PDCD4 are closely related to cognitive function, and the combination of the three has high predictive value for CI in PD patients.
Key words: Parkinson disease; cognitive dysfunction; thioredoxins; apoptosis regulatory proteins; aquaporin 4; programmed cell death factor 4
帕金森病(Parkinson's disease,PD)是除阿爾茨海默病以外的較常見的神經(jīng)系統(tǒng)退行性疾病,多發(fā)生于老人,且我國的發(fā)病率較高[1-2]。認(rèn)知功能障礙(cognitive impairment,CI)是PD的常見并發(fā)癥,PD患者在記憶力及注意力等方面的表現(xiàn)明顯弱于同年齡的無PD者,且隨病情的加重最終會(huì)演變?yōu)榘V呆[3-4]。血清硫氧還蛋白1(thioredoxin 1,Trx1)是一種小分子蛋白,主要參與細(xì)胞內(nèi)的氧化還原反應(yīng),能夠抵抗氧化應(yīng)激過程對(duì)細(xì)胞造成的損傷,且對(duì)于預(yù)測(cè)腦梗死患者出現(xiàn)CI具有重要價(jià)值[5-6]。程序性細(xì)胞死亡因子4(programmed cell death factor 4,PDCD4)是一種抑癌基因,其編碼的蛋白能夠阻斷靶基因的翻譯過程,在炎癥、肥胖、心血管疾病的發(fā)生發(fā)展中起重要作用,同時(shí)PDCD4水平升高能加重腦損傷,且與腦小血管病患者CI關(guān)系密切[7]。水通道蛋白4(AQP4)是一種跨膜通道蛋白,在控制腦內(nèi)水平衡、抑制神經(jīng)細(xì)胞凋亡、調(diào)節(jié)突觸可塑性以及維持血腦屏障中具有重要作用,且與癲癇患兒認(rèn)知功能密切相關(guān)[8]。但目前鮮見上述3種因子與PD患者認(rèn)知功能關(guān)系的研究。因此,本研究將探討PD患者血清Trx1、PDCD4、AQP4水平與認(rèn)知功能的關(guān)系,分析其作為PD患者發(fā)生CI預(yù)測(cè)指標(biāo)的價(jià)值,為臨床預(yù)防及治療該疾病提供幫助。
1 對(duì)象與方法
1.1 研究對(duì)象 選取2023年1月—2024年6月在本院神經(jīng)外科就診的145例PD患者(PD組)作為研究對(duì)象,其中男77例,女68例,年齡44~83歲,平均(67.23±8.28)歲。PD患者Hoehn-Yahr分期[9]:Ⅲ期48例、Ⅳ期59例、Ⅴ期38例。再取同期105例體檢健康者作為對(duì)照組,其中男55例,女50例,年齡43~86歲,平均(67.54±8.24)歲。PD組和對(duì)照組性別(χ2=0.013)、年齡(t=0.293)比較,差異均無統(tǒng)計(jì)學(xué)意義。
1.2 納入及排除標(biāo)準(zhǔn) 納入標(biāo)準(zhǔn):(1)診斷符合《中國帕金森病的診斷標(biāo)準(zhǔn)(2016版)》[10]。(2)臨床資料完整。排除標(biāo)準(zhǔn):(1)顱腦外傷者。(2)腦卒中者。(3)有腦部手術(shù)史。(4)既往存在藥物濫用史。(5)嚴(yán)重感染及惡性腫瘤者。(6)有先天性心臟病和自身免疫病等疾病。本研究已通過倫理委員會(huì)批準(zhǔn)(2023-00209),且所有患者或其監(jiān)護(hù)人簽署了知情同意書。
1.3 臨床資料收集 收集研究中涉及的所有受試者臨床資料,包括年齡、性別、體質(zhì)量指數(shù)(BMI)、吸煙史、飲酒史、家族史、受教育年限、PD病程以及總膽固醇(TC)、三酰甘油(TG)、低密度脂蛋白膽固醇(LDL-C)、高密度脂蛋白膽固醇(HDL-C)及Hoehn-Yahr分期。
1.4 認(rèn)知功能評(píng)分 使用簡(jiǎn)易智能狀態(tài)檢查量表(mini-mental state examination,MMSE)[11]對(duì)PD患者的認(rèn)知功能進(jìn)行評(píng)分。評(píng)分標(biāo)準(zhǔn)如下:從時(shí)間定向力、地點(diǎn)定向力、即刻記憶、注意力及計(jì)算力、延遲記憶、語言、視空間7個(gè)方面進(jìn)行評(píng)分,共計(jì)30項(xiàng),通過1項(xiàng)得1分。另采用蒙特利爾認(rèn)知評(píng)估量表(Montreal cognitive assessment,MoCA)收集PD患者的MoCA評(píng)分,評(píng)分越高代表認(rèn)知能力越好[12]。由于受教育年限與CI相關(guān),因此將受教育年限0~9年者,總評(píng)分加2分,受教育年限9年以上者總評(píng)分加1分;根據(jù)校正后受教育年限所得MoCA評(píng)分將患者分為CI組(0~24分,43例)和無CI組(>24~30分,102例)。
1.5 血清Trx1、PDCD4、AQP4水平檢測(cè) 采用酶聯(lián)免疫吸附試驗(yàn)(ELISA)檢測(cè)血清Trx1、PDCD4、AQP4水平。PD組采集入院24 h內(nèi)空腹血樣,健康者采集清晨空腹血樣。血樣收集完成后使用高速離心機(jī)進(jìn)行離心,收集上層血清。參照購買的PDCD4、AQP4 ELISA試劑盒(菲恩生物)和Trx1 ELISA試劑盒(Abcam)說明書步驟加樣,后使用酶標(biāo)儀檢測(cè)標(biāo)準(zhǔn)品和待測(cè)樣本在450 nm處的吸光度,繪制標(biāo)準(zhǔn)曲線并以此計(jì)算各樣本Trx1、PDCD4、AQP4水平。
1.6 統(tǒng)計(jì)學(xué)方法 采用SPSS 21.0分析數(shù)據(jù),符合正態(tài)分布的計(jì)量資料用[[x] ±s
]表示,2組間比較采用t檢驗(yàn);計(jì)數(shù)資料用例(%)表示,組間比較采用χ2檢驗(yàn);Pearson法分析PD患者血清Trx1、PDCD4、AQP4水平與CI評(píng)分的相關(guān)性;多因素Logistic回歸分析PD患者發(fā)生CI的影響因素;受試者工作特征(ROC)曲線分析血清Trx1、PDCD4、AQP4水平及三者聯(lián)合對(duì)PD患者發(fā)生CI的預(yù)測(cè)價(jià)值。P<0.05為差異有統(tǒng)計(jì)學(xué)意義。
2 結(jié)果
2.1 PD患者與對(duì)照組血清Trx1、PDCD4、AQP4水平比較 PD組血清Trx1、AQP4水平低于對(duì)照組,PDCD4水平高于對(duì)照組(P<0.01),見表1。
2.2 不同認(rèn)知功能PD患者臨床資料及血清Trx1、PDCD4、AQP4水平比較 見表2。2組年齡、性別、吸煙史、飲酒史、家族史、Hoehn-Yahr分期、TG、TC、HDL-C、LDL-C比較差異無統(tǒng)計(jì)學(xué)意義(P>0.05);CI組PD病程、PDCD4水平高于無CI組(P<0.05),BMI、受教育年限、MMSE評(píng)分、MoCA評(píng)分、Trx1、AQP4水平低于無CI組(P<0.05)。
3 討論
PD的病理特征表現(xiàn)為黑質(zhì)致密部多巴胺能神經(jīng)細(xì)胞受損,殘存神經(jīng)細(xì)胞中出現(xiàn)帶有α-突觸核蛋白的路易小體[13-15]。PD發(fā)病機(jī)制較為復(fù)雜,氧化應(yīng)激、神經(jīng)炎癥、蛋白質(zhì)錯(cuò)誤折疊和聚集及線粒體損傷都可能與PD的發(fā)生和發(fā)展有關(guān)[4]。CI是PD患者中較常見的一種非運(yùn)動(dòng)癥狀。研究表明,PD患者中有25%~30%在疾病發(fā)作時(shí)即存在認(rèn)知缺陷,50%在患病3~5年認(rèn)知功能下降,75%在患病10年內(nèi)會(huì)進(jìn)展為癡呆[3,16]。因此,及早對(duì)PD患者的CI情況作出判斷并進(jìn)行針對(duì)性預(yù)防和治療,對(duì)改善認(rèn)知功能狀況十分重要。
Trx1屬于硫氧還蛋白家族成員,是一種重要的類趨化因子,可以清除氧化應(yīng)激過程中產(chǎn)生的活性氧以發(fā)揮保護(hù)細(xì)胞的作用。有研究報(bào)道,Trx1可以通過調(diào)控白細(xì)胞介素6、腫瘤壞死因子α等多種炎性細(xì)胞因子控制機(jī)體的炎癥反應(yīng)[17]。另有研究發(fā)現(xiàn),Trx1在腦梗死患者血清中的水平降低,且發(fā)生CI的腦梗死患者血清Trx1水平明顯低于認(rèn)知正常者[18]。本研究發(fā)現(xiàn),CI組患者Trx1低于無CI組,表明Trx1水平與PD及其CI的發(fā)生相關(guān),推測(cè)Trx1可能通過清除氧化應(yīng)激的代謝產(chǎn)物來改善腦組織的缺血缺氧狀況,進(jìn)而減輕患者CI[19]。另外,ROC曲線分析顯示Trx1單獨(dú)預(yù)測(cè)PD患者發(fā)生CI的敏感度較高,但特異度較低,當(dāng)Trx1水平低于7.97 μg/L時(shí),應(yīng)密切關(guān)注患者的認(rèn)知狀況。
PDCD4屬于蛋白酪氨酸磷酸酶家族成員,編碼基因位于人體的第10號(hào)染色體,編碼469個(gè)氨基酸,分子質(zhì)量約為17.0 ku[6,20]。研究發(fā)現(xiàn),PDCD4在腦小血管病患者及其合并CI的患者中水平均異常升高,且PD患者中高水平PDCD4可以通過阻斷細(xì)胞自噬導(dǎo)致多巴胺能神經(jīng)元損傷[6,21]。這與本研究中PD患者PDCD4變化趨勢(shì)一致,提示PDCD4與PD及其合并CI組患者關(guān)系密切,其可能是預(yù)測(cè)PD患者發(fā)生CI的重要指標(biāo)。本研究ROC曲線分析發(fā)現(xiàn)PDCD4單獨(dú)檢測(cè)對(duì)PD患者發(fā)生CI具有一定的預(yù)測(cè)價(jià)值,臨界值為47.73 μg/L。
AQP4又稱水孔蛋白,主要存在于人體的腎臟中,其具有易化星形膠質(zhì)細(xì)胞的遷移、控制腦內(nèi)水分的流動(dòng)以及改變神經(jīng)系統(tǒng)興奮性等功能[22]。有研究表明,癲癇患兒體內(nèi)AQP4水平降低,且發(fā)生CI的癲癇患兒水平更低[8]。本研究中,PD組血清AQP4水平低于對(duì)照組,且發(fā)生CI的患者血清AQP4低于無CI組,表明AQP4水平同樣反映了PD患病以及PD患者發(fā)生CI的情況。已有研究證實(shí),低水平AQP4使鉀離子清除時(shí)間延長(zhǎng),降低了神經(jīng)系統(tǒng)的興奮性,并通過調(diào)控神經(jīng)炎癥反應(yīng)和血腦屏障通透性增加了CI發(fā)生的風(fēng)險(xiǎn)[8]。ROC曲線分析發(fā)現(xiàn)AQP4單獨(dú)預(yù)測(cè)PD患者發(fā)生CI的AUC為0.831,敏感度為93.02%,臨界值為39.55 μg/L,說明AQP4有可能成為預(yù)測(cè)PD患者發(fā)生CI的血清學(xué)指標(biāo)。
基于上述單指標(biāo)預(yù)測(cè)分析結(jié)果,本研究同時(shí)進(jìn)行了聯(lián)合分析,結(jié)果顯示聯(lián)合預(yù)測(cè)效能更高。此外,本研究還發(fā)現(xiàn),CI組患者BMI和PD病程與無CI組相比差異明顯,故提示可以通過收集患者一般資料信息對(duì)其進(jìn)行初步風(fēng)險(xiǎn)評(píng)估。
綜上所述,與健康者比較,PD患者的血清Trx1、AQP4水平降低,PDCD4水平升高,且三者與認(rèn)知功能密切相關(guān),三者聯(lián)合對(duì)PD患者發(fā)生CI的預(yù)測(cè)價(jià)值較高。但由于本研究使用樣本量較少,后續(xù)仍需繼續(xù)增加樣本量,對(duì)所得結(jié)果進(jìn)一步驗(yàn)證。
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(2024-10-23收稿 2024-11-27修回)
(本文編輯 李國琪)