[摘要]目的探究慢性1-甲基-4-苯基-1,2,3,6-四氫吡啶(MPTP)誘導(dǎo)帕金森病(PD)模型小鼠黑質(zhì)(SN)和外側(cè)蒼白球(GPe)腦區(qū)星形膠質(zhì)細(xì)胞、小膠質(zhì)細(xì)胞數(shù)目及鐵沉積的變化。方法將健康雄性8周齡C57BL/6小鼠隨機(jī)分成對照組和MPTP組,MPTP組小鼠腹腔注射MPTP(18 mg/kg體質(zhì)量),對照組給予等體積生理鹽水,每周2次,持續(xù)5周。通過爬桿實(shí)驗(yàn)檢測小鼠運(yùn)動(dòng)功能,組織免疫熒光染色檢測酪氨酸羥化酶(TH)神經(jīng)元、星形膠質(zhì)細(xì)胞和小膠質(zhì)細(xì)胞數(shù)目,普魯士藍(lán)鐵染色(Perl’s-DAB)檢測鐵沉積。結(jié)果與對照組相比,MPTP組小鼠爬桿轉(zhuǎn)頭時(shí)間明顯增加,差異有統(tǒng)計(jì)學(xué)意義(t=2.42,P<0.05);SN中TH神經(jīng)元數(shù)目減少,星形膠質(zhì)細(xì)胞和小膠質(zhì)細(xì)胞數(shù)目增加,鐵陽性細(xì)胞數(shù)增加,差異均有統(tǒng)計(jì)學(xué)意義(t=3.82~4.83,P<0.05);GPe中小膠質(zhì)細(xì)胞數(shù)目顯著增多(t=2.54,P<0.05),星形膠質(zhì)細(xì)胞和鐵陽性細(xì)胞數(shù)目無變化。結(jié)論MPTP誘導(dǎo)的PD小鼠模型建模成功。模型鼠SN膠質(zhì)細(xì)胞激活和鐵沉積均增多,而GPe中僅有小膠質(zhì)細(xì)胞激活增多。
[關(guān)鍵詞]帕金森病;鐵;1-甲基-4-苯基-1,2,3,6-四氫吡啶;蒼白球;黑質(zhì);小神經(jīng)膠質(zhì)細(xì)胞;星形細(xì)胞;小鼠,近交C57BL
[中圖分類號(hào)]R742.5;R591.1[文獻(xiàn)標(biāo)志碼]A[文章編號(hào)]2096-5532(2024)03-0350-05
doi:10.11712/jms.2096-5532.2024.60.097[開放科學(xué)(資源服務(wù))標(biāo)識(shí)碼(OSID)]
[網(wǎng)絡(luò)出版]https://link.cnki.net/urlid/37.1517.R.20240729.1543.001;2024-07-3014:35:18
Changes in glial cell activation and iron deposition in the externalglobus pallidus of mice with Parkinson’s diseaseLI Mengyu, MA Xizhen, XIE Junxia, SONG Ning(Department of Physiology and Pathophysiology, School of Basic Medicine, Qingdao University Medical College, Qingdao 266071, China)
[Abstract]ObjectiveTo investigate the changes inastrocytes, microglial cells, and iron deposition in the substantia nigra (SN) and the externalglobus pallidus (GPe) in a mouse model of Parkinson’s disease (PD) induced by 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP). MethodsHealthy male C57BL/6 mice, aged 8 weeks, were randomly divided into control group and MPTP group. The mice in the MPTP group were intraperitoneally injected with MPTP at a dose of 18 mg/kg body weight, while those in the control group were given an equal volume of normal saline, twice a week for 5 weeks. The pole test was used to measure the motor function of mice; immunofluorescent staining was used to measure the numbers of tyrosine hydroxylase (TH) neurons, astrocytes, and microglial cells; Prussian blue iron staining was used to observe iron deposition. ResultsCompared with the control group, the MPTP group had a significant increase in the time to turn around (t=2.42,Plt;0.05), a significant reduction in the number of TH neurons and significant increases in the numbers of astrocytes, microglial cells, and iron-positive cells in the SN (t=3.82-4.83,Plt;0.05), and a significant increase in the number of microglial cells in the GPe (t=2.54,Plt;0.05), but there were no significant changes in the numbers of astrocytes and iron-positive cells in the GPe. ConclusionThe mouse model of PD induced by MPTP is successfully established. There are increases in glial cell activation and iron deposition in the SN of model mice, while there is only an increase in microglial cell activation in the GPe.
[Key words]Parkinson disease; iron; 1-methyl-4-phenyl-1, 2, 3, 6-tetrahydropyridine; globus pallidus; substantia nigra; microglia; astrocytes; mice, inbred" C57BL
帕金森?。≒D)是一種主要包括運(yùn)動(dòng)遲緩和靜止性震顫等臨床表現(xiàn)的神經(jīng)退行性疾病,其發(fā)病率隨年齡增長而升高[1-3]。PD的神經(jīng)病理學(xué)標(biāo)志是黑質(zhì)(SN)致密部(SNc)表現(xiàn)出多巴胺能神經(jīng)元丟失,以及路易小體形成[3]。慢性神經(jīng)炎癥是PD的主要特征[4]。PD病人SN區(qū)存在著小膠質(zhì)細(xì)胞和星形膠質(zhì)細(xì)胞激活,且存在著鐵沉積[5-6]。除了SN,蒼白球(GP)也是鐵代謝的關(guān)鍵腦區(qū)[7]。PD病人GP鐵含量顯著高于健康對照[6,8]。蒼白球外側(cè)部(GPe)是中央基底神經(jīng)節(jié)核團(tuán)。GPe神經(jīng)元具有調(diào)節(jié)或維持正在進(jìn)行的動(dòng)作的能力。此外,GPe神經(jīng)元參與了非運(yùn)動(dòng)功能,包括學(xué)習(xí)、睡眠以及對感覺和獎(jiǎng)勵(lì)線索的處理等[9-13]。GPe神經(jīng)元種類復(fù)雜[14-15]。在1-甲基-4-苯基-1,2,3,6-四氫吡啶(MPTP)制備的PD小鼠模型中,對SN膠質(zhì)細(xì)胞的激活與鐵沉積研究較多,但GPe是否存在膠質(zhì)細(xì)胞的激活和鐵沉積并沒有報(bào)道。本研究采用慢性MPTP模型來模擬PD的發(fā)病進(jìn)程,探究PD狀態(tài)下GPe的炎癥反應(yīng)與鐵沉積變化。
1材料與方法
1.1實(shí)驗(yàn)材料
1.1.1動(dòng)物來源及飼養(yǎng)SPF級(jí)8周齡C57BL/6小鼠,由江蘇集萃藥康公司提供。小鼠飼養(yǎng)在自由飲水取食、晝夜光照循環(huán)(12 h/12 h)、室溫(20±2)℃、濕度(50±5)%的動(dòng)物室,1周后開始實(shí)驗(yàn)。實(shí)驗(yàn)動(dòng)物使用符合青島大學(xué)醫(yī)學(xué)部倫理委員會(huì)動(dòng)物倫理學(xué)要求。
1.1.2主要試劑及來源MPTP購自美國Sigma公司,神經(jīng)膠質(zhì)酸性蛋白(GFAP)抗體、離子鈣結(jié)合銜接分子-1(IBA-1)抗體均購于美國Cell Signaling Technology公司,酪氨酸羥化酶(TH)抗體、山羊抗兔熒光二抗均購于美國Thermo Fisher Scientific公司。
1.2實(shí)驗(yàn)方法
1.2.1動(dòng)物分組及處理將27只小鼠隨機(jī)分為對照組(13只)和MPTP組(14只)。 MPTP組小鼠腹腔注射質(zhì)量濃度為1.8 g/L的 MPTP(18 mg/kg體質(zhì)量),對照組腹腔注射等體積生理鹽水,每周2次,持續(xù)5周。
1.2.2小鼠爬桿實(shí)驗(yàn)采用瑞沃德(RWD)公司提供的小鼠爬桿裝置進(jìn)行實(shí)驗(yàn)。爬桿為直徑 0.8 cm、長 50.0 cm、頂端帶有直徑 3.0 cm 的圓球的木桿,表面以醫(yī)用膠帶纏繞防滑。整個(gè)裝置置于塑料盒中,實(shí)驗(yàn)開始前用新墊料鋪于底部,并沒過底座。實(shí)驗(yàn)前1 d,對小鼠進(jìn)行適應(yīng)性訓(xùn)練,正式實(shí)驗(yàn)時(shí)將小鼠放置于桿頂端,頭部朝上,記錄小鼠掉頭時(shí)間,取3次實(shí)驗(yàn)平均值進(jìn)行統(tǒng)計(jì)分析。
1.2.3腦組織免疫熒光染色取小鼠腦組織使用冷凍切片機(jī)(Leica,CM1950))進(jìn)行切片。切片之前將機(jī)器預(yù)冷至-20 ℃,將腦組織用包埋劑 OCT(SakuraFinetek)包埋并固定,切成厚度為20 μm 的腦片。將腦片置于40 g/L甲醛溶液中固定10 min;PBS(0.01 mol/L)漂洗3次,每次10 min;用PBST稀釋的體積分?jǐn)?shù)0.05驢血清溶液封閉腦片1 h,隨后將腦片置于使用封閉液配制的一抗(TH(1∶1 000),IBA-1(1∶200),GFAP(1∶300))中,并置于4 ℃搖床上孵育過夜;PBS(0.01 mol/L)漂洗3次,每次10 min;加入二抗室溫避光搖床孵育2 h,隨后在每孔中加入DAPI染色液50 μL繼續(xù)孵育5 min;PBS(0.01 mol/L)漂洗3次,每次10 min。將腦片平鋪至潔凈的病理防脫載玻片上,適當(dāng)干燥后用體積分?jǐn)?shù)0.70甘油封片,用Olympus 數(shù)字病理切片掃描系統(tǒng)觀察并掃描。分別計(jì)數(shù)每個(gè)高倍視野(400倍)內(nèi)SN區(qū)和GPe區(qū)TH、IBA-1和GFAP陽性細(xì)胞總數(shù)并取平均值。
1.2.4普魯士藍(lán)鐵染色(Perl’s-DAB)實(shí)驗(yàn)將小鼠腦片置于40 g/L甲醛溶液中固定5 min,去離子水漂洗 30 s;置于以等體積混合的20 g/L亞鐵氰化鉀溶液與20 g/L的HCl溶液室溫?fù)u床孵育30 min;PBS(0.01 mol/L)漂洗2次,每次5 min;體積分?jǐn)?shù)0.03的 H2O2-甲醇溶液室溫?fù)u床孵育20 min,以封閉內(nèi)源性過氧化氫酶;用PBS(0.01 mol/L)漂洗腦片2次,每次5 min;然后將小鼠腦片置于DAB顯色液中避光顯色10 min,用雙蒸水終止顯色;將腦片平鋪至潔凈的病理防脫載玻片上,完全干燥后用中性樹膠封片。用Olympus數(shù)字病理切片掃描系統(tǒng)在明場顯微鏡下進(jìn)行觀察并掃描。分別計(jì)數(shù)每個(gè)高倍視野(400倍)內(nèi)SN區(qū)和GPe區(qū)的鐵染色陽性細(xì)胞數(shù)目并取平均值。
1.3統(tǒng)計(jì)學(xué)處理
采用Prism 9軟件進(jìn)行統(tǒng)計(jì)學(xué)分析。計(jì)量資料數(shù)據(jù)以±s表示,兩組均數(shù)比較采用獨(dú)立樣本t檢驗(yàn)。以P<0.05為差異有統(tǒng)計(jì)學(xué)意義。
2結(jié)果
2.1兩組小鼠運(yùn)動(dòng)功能和SN區(qū)TH陽性神經(jīng)元計(jì)數(shù)比較
爬桿實(shí)驗(yàn)結(jié)果顯示,與對照組小鼠的掉頭時(shí)間(1.66±0.51)s比較,MPTP組的(2.12±0.48)s明顯增加,差異有統(tǒng)計(jì)學(xué)意義(t=2.42,P<0.05)。運(yùn)動(dòng)行為學(xué)實(shí)驗(yàn)結(jié)果表明,MPTP組小鼠出現(xiàn)運(yùn)動(dòng)功能障礙。免疫熒光染色檢測結(jié)果表明,與對照組小鼠SN區(qū)TH陽性神經(jīng)元總數(shù)(8 383.00±865.16)相比,MPTP組的(6 443.00±470.71)顯著減少,差異有統(tǒng)計(jì)學(xué)意義(t=4.83,P<0.05)。提示PD小鼠模型造模成功。
2.2兩組小鼠SN區(qū)星形膠質(zhì)細(xì)胞、小膠質(zhì)細(xì)胞和鐵沉積比較免疫熒光染色結(jié)果表明,與對照組小鼠SN區(qū)GFAP(200.00±67.94)和IBA-1(243.10±16.32)陽性細(xì)胞總數(shù)相比,MPTP組小鼠的GFAP(329.00±47.30)和IBA-1(293.10±25.31)顯著升高,差異有統(tǒng)計(jì)學(xué)意義(t=3.82、4.07,P<0.05)。提示MPTP誘導(dǎo)的PD小鼠模型SN區(qū)星形膠質(zhì)細(xì)胞和小膠質(zhì)細(xì)胞被激活。Perl’s-DAB染色表明,與對照組小鼠SN區(qū)鐵陽性細(xì)胞數(shù)目(2 087.00±277.12)相比,MPTP組的(2 743.00±238.18)顯著增多,差異有統(tǒng)計(jì)學(xué)意義(t=4.40,P<0.05)。提示MPTP誘導(dǎo)的PD模型小鼠SN區(qū)出現(xiàn)鐵沉積。見圖1。
2.3兩組小鼠GPe區(qū)星形膠質(zhì)細(xì)胞、小膠質(zhì)細(xì)胞和鐵沉積比較
免疫熒光染色結(jié)果表明,與對照組小鼠GPe區(qū)IBA-1陽性細(xì)胞平均數(shù)(16.15±2.48)相比,MPTP組的(19.63±2.27)明顯升高,差異有統(tǒng)計(jì)學(xué)意義(t=2.54,P<0.05)。提示GPe區(qū)小膠質(zhì)細(xì)胞被激活。MPTP組小鼠GPe區(qū)GFAP陽性細(xì)胞數(shù)目與對照組比較,差異無顯著性(t=1.35,P>0.05)。提示GPe區(qū)星形膠質(zhì)細(xì)胞未被激活。Perl’s-DAB染色表明,MPTP組小鼠GPe區(qū)鐵陽性細(xì)胞數(shù)目與對照組相比,差異無顯著性(t=0.03,P>0.05)。提示MPTP誘導(dǎo)的PD模型小鼠GPe區(qū)并未出現(xiàn)鐵沉積。見圖2。
3討論
在PD病人的SN中小膠質(zhì)細(xì)胞激活先于神經(jīng)元丟失,小膠質(zhì)細(xì)胞激活可以加重神經(jīng)炎癥,進(jìn)一步加劇神經(jīng)元丟失,小膠質(zhì)細(xì)胞激活可促進(jìn)PD神經(jīng)變性的進(jìn)展[16-18]。有研究證明,GPe中的小清蛋白陽性神經(jīng)元向黑質(zhì)網(wǎng)狀部具有直接投射,這種投射與小鼠的運(yùn)動(dòng)能力直接相關(guān),并可以激活基底神經(jīng)節(jié)中的核團(tuán)[11]。同時(shí),SN的多巴胺能神經(jīng)元可以投射到GPe[19]。本文研究結(jié)果表明,SN多巴胺能神經(jīng)元損傷時(shí),該腦區(qū)的小膠質(zhì)細(xì)胞和星形膠質(zhì)細(xì)胞被激活,同時(shí)GPe小膠質(zhì)細(xì)胞也被激活。已有文獻(xiàn)報(bào)道,細(xì)胞內(nèi)鐵過載可加重內(nèi)毒素或神經(jīng)毒素對小膠質(zhì)細(xì)胞的激活[20-21],且特別容易受到鐵過載誘導(dǎo)的鐵死亡的影響[22]。正常人腦組織中,GP鐵含量較高[23-25]。我們推測,可能是由于GPe鐵含量較高,所以當(dāng)SN神經(jīng)元損傷時(shí),其投射至GPe的末梢受損,致小膠質(zhì)細(xì)胞容易被激活。星形膠質(zhì)細(xì)胞現(xiàn)在被認(rèn)為是神經(jīng)退行性疾病中的關(guān)鍵參與者[26-28]。相對于小膠質(zhì)細(xì)胞,星形膠質(zhì)細(xì)胞對鐵的敏感性更低[22]。這可能是GPe未出現(xiàn)星形膠質(zhì)細(xì)胞激活的原因之一。
磁共振成像技術(shù)顯示,快速眼動(dòng)睡眠行為障礙病人檢測中僅SN發(fā)現(xiàn)鐵含量升高,SN中鐵沉積增加[6]。隨著疾病發(fā)展,在其他大腦區(qū)域也出現(xiàn)鐵沉積增加,包括殼核、GP等[8,29]。最新研究表明,在多巴胺能神經(jīng)元喪失之前,神經(jīng)炎癥首先發(fā)生在黑質(zhì)-紋狀體系統(tǒng)中,并同時(shí)出現(xiàn)鐵沉積[20]。無論是在PD病人中還是在動(dòng)物模型中,GPe鐵沉積都要晚于SN鐵沉積。本文僅在SN中觀察到了鐵沉積,而并未在GPe中觀察到鐵沉積。我們推測,本文PD模型小鼠GPe未出現(xiàn)鐵沉積可能是由于造模時(shí)間較短,尚未引起GPe明顯的鐵沉積。小膠質(zhì)細(xì)胞在SN中比其他腦區(qū)分布更豐富,與神經(jīng)炎癥密切相關(guān),這導(dǎo)致神經(jīng)元的區(qū)域特異性易感性[30-31]。這可能也是為什么SN更容易出現(xiàn)鐵沉積,而GPe不容易出現(xiàn)鐵沉積的原因之一。我們推測,延長造模時(shí)間可能會(huì)造成GPe鐵沉積。
綜上所述,經(jīng)典慢性MPTP小鼠PD模型可以引起GPe中小膠質(zhì)細(xì)胞的激活,不能引起星形膠質(zhì)細(xì)胞的激活和鐵沉積。后續(xù)會(huì)更換PD小鼠模型或延長造模時(shí)間,進(jìn)行更深入的機(jī)制研究。本實(shí)驗(yàn)結(jié)果為研究模擬PD晚期時(shí)GPe膠質(zhì)細(xì)胞激活和鐵沉積提供了新的理論基礎(chǔ),為進(jìn)一步探討GPe腦區(qū)在PD發(fā)病機(jī)制中的作用提供了一定的實(shí)驗(yàn)依據(jù)。
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