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外側(cè)蒼白球注射鐵死亡誘導(dǎo)劑對小鼠運動行為的影響

2024-08-22 00:00:00王娟李暉宋寧謝俊霞
關(guān)鍵詞:小鼠

[摘要]目的探討外側(cè)蒼白球(GPe)立體定位注射鐵死亡誘導(dǎo)劑RSL3或Erastin對小鼠運動行為的影響。方法將8周齡雄性C57BL/6小鼠隨機分為對照組8只、實驗組24只(Erastin組12只、RSL3組12只)。借助腦立體定位注射技術(shù),實驗組小鼠GPe雙側(cè)注射200 nL的RSL3或Erastin(濃度為10 μmol/L),對照組小鼠注射等體積生理鹽水。兩周后,采用步態(tài)分析實驗檢測小鼠的運動能力,采用免疫印跡法檢測小鼠GPe中長鏈酯酰輔酶A合成酶4(ACSL4)和谷胱甘肽過氧化物酶4(GPX4)的表達。結(jié)果與對照組相比,Erastin組和RSL3組小鼠的擺動速度均升高,RSL3組小鼠的最大接觸面積、腳印面積和步幅長度均發(fā)生明顯改變,差異均有顯著性(F=5.433~7.486,q=4.039~5.446,P<0.05)。Erastin組和RSL3組小鼠GPe中GPX4表達水平均明顯下降,而RSL3組小鼠GPe中ACSL4表達水平明顯升高,差異均有統(tǒng)計學(xué)意義(F=6.207、19.740,q=3.847~7.735,P<0.01)。結(jié)論小鼠GPe立體定位注射鐵死亡誘導(dǎo)劑RSL3或Erastin兩周后可發(fā)生鐵死亡,運動行為增強。

[關(guān)鍵詞]蒼白球;鐵死亡;立體定位技術(shù);移動;小鼠,近交C57BL

[中圖分類號]R322.81;R329.2[文獻標志碼]A[文章編號]2096-5532(2024)03-0317-05

doi:10.11712/jms.2096-5532.2024.60.048[開放科學(xué)(資源服務(wù))標識碼(OSID)]

[網(wǎng)絡(luò)出版]https://link.cnki.net/urlid/37.1517.R.20240424.0943.005;2024-04-2417:07:50

Effect of stereotactic injection of a ferroptosis inducer in the external segment of globus pallidus on motor behavior in miceWANG Juan, LI Hui, SONG Ning, XIE Junxia (Department of Physiology and Pathophysiology, School of Basic Medicine, Qingdao University Medical College, Qingdao 266071, China)

[Abstract]ObjectiveTo investigate the effect of stereotactic injection of the ferroptosis inducer RSL3 or Erastin in the external segment of the globus pallidus (GPe) on the motor behavior of mice. MethodsMale C57BL/6 mice, aged 8 weeks, were randomly divided into control group with 8 mice and experimental group with 24 mice (12 mice in Erastin group and 12 mice in RSL3 group). By means of the stereotactic injection technique, the mice in the experimental group were injected with 200 nL RSL3 or Erastin (with a concentration of 10 μmol/L) into the bilateral GPe, and thosein the control group were injected with an equal volume of normal saline. After two weeks, gait analysis was used to observethe motor behavior of mice, and Western blot was used to measure the protein expression levels of long-chain acyl-CoA synthetase 4 (ACSL4) and glutathione peroxidase 4 (GPX4) in mouse GPe. ResultsCompared with the control group, the Erastin group and the RSL3 group had a significant increase in the swing speed of mice, and the RSL3 group had significant changes in maximum contact area, footprint area, and stride length (F=5.433-7.486,q=4.039-5.446,Plt;0.05). Compared with the control group, the Erastin group and the RSL3 group had a significant reduction in the protein expression level of GPX4 in the GPe of mice, and the RSL3 group had a significant increase in the protein expression level of ACSL4 (F=6.207,19.740;q=3.847-7.735;Plt;0.01). ConclusionStereotactic injection of the ferroptosis inducer RSL3 or Erastin in the GPe of mice can induce ferroptosis after two weeks, with enhanced motor behavior of mice.

[Key words]globus pallidus; ferroptosis; stereotactic techniques; locomotion; mice, inbred C57BL

帕金森病(PD)是一種常見的神經(jīng)退行性疾病,其患病率隨著年齡的增長而上升[1]。PD的神經(jīng)病理學(xué)標志是黑質(zhì)(SN)致密部(SNc)出現(xiàn)多巴胺能神經(jīng)元丟失,以及路易小體的形成。PD被認為是一種多系統(tǒng)疾病,其臨床主要表現(xiàn)為運動遲緩、靜息性震顫、僵直、姿勢和步態(tài)改變等運動癥狀,以及嗅覺減退、便秘、體位性低血壓、記憶喪失、抑郁、疼痛和睡眠障礙等非運動癥狀[1-2]。蒼白球(GP),又稱為舊紋狀體,分為內(nèi)側(cè)蒼白球(GPi)和外側(cè)蒼白球(GPe),位于基底神經(jīng)節(jié)的中心位置。GPe內(nèi)95%的神經(jīng)元為γ-氨基丁酸抑制性神經(jīng)元,是基底神經(jīng)節(jié)的主要輸出核團,在間接通路中連接紋狀體與丘腦底核,在運動功能調(diào)節(jié)方面發(fā)揮重要作用[3]。在PD中GPe功能障礙幾乎與所有的運動和非運動癥狀有關(guān)。鐵死亡是鐵依賴性的脂質(zhì)過氧化驅(qū)動的一種獨特的細胞死亡方式[4]。Erastin和RSL3是兩種經(jīng)典的鐵死亡誘導(dǎo)劑。Erastin通過抑制Xc-系統(tǒng),促進細胞對胱氨酸的攝取減少,從而降低細胞內(nèi)還原型谷胱甘肽(GSH)的水平;可以改變線粒體外膜的通透性,其作用靶點是電壓依賴性陰離子通道(VDACs);還可以通過調(diào)節(jié) ACSL4 來刺激脂質(zhì)過氧化[5-11]。RSL3是另一種鐵死亡誘導(dǎo)劑[12],它不依賴于VDACs或Xc-系統(tǒng),而是通過與 GPX4 的結(jié)合導(dǎo)致后者失去活性,因此一般認為GPX4參與 RSL3 誘導(dǎo)的鐵死亡,導(dǎo)致脂質(zhì)過氧化物的積累增加[13-17]。在PD的體外和體內(nèi)模型中,鐵死亡已被證明是一種普遍的細胞死亡方式[18-19]。PD病人雖然存在蒼白球鐵沉積,但尚無研究報道是否存在鐵死亡,GPe鐵死亡是否與運動行為相關(guān)更無從可知[20]。本研究通過GPe立體定位注射鐵死亡誘導(dǎo)劑RSL3或Erastin探究其對小鼠運動行為影響。

1材料和方法

1.1實驗材料

1.1.1實驗動物與飼養(yǎng)SPF級雄性C57BL/6小鼠,8周齡,體質(zhì)量(21±2)g,購自江蘇集萃藥康生物科技股份有限公司。將小鼠飼養(yǎng)于可自由飲水取食、室溫(20±2)℃、濕度(50±5)%、晝夜循環(huán)光照(12 h/12 h)的清潔環(huán)境中。動物實驗符合青島大學(xué)動物倫理學(xué)要求。

1.1.2主要試劑及來源Erastin購自美國Sigma公司,RSL3購自美國Selleck公司,ACSL4、GPX4一抗均購自英國abcam公司, Rabbit-Anti-β-actin一抗購自中國博奧森公司,Goat-Anti-Rabbit IgG二抗購自中國愛必信公司。

1.2實驗方法

1.2.1動物分組與處理將小鼠隨機分為對照組(8只)和實驗組(Erastin組12只、RSL3組12只)。用異氟烷對小鼠進行全身麻醉,然后將其固定在腦立體定位儀上。將小鼠顱腦背側(cè)皮膚切開,以體積分數(shù)0.03的過氧化氫溶液從顱骨表面擦洗,直至顱縫和前后囟清晰可見。調(diào)整確定坐標(右側(cè)GPe立體定位坐標為前囟后0.35 mm、右旁開2.05 mm、深度3.70 mm)后,采用微量注射泵在兩側(cè)GPe注射200 nL生理鹽水或鐵死亡誘導(dǎo)劑(RSL3或Erastin,濃度均為10 μmol/L),流量為0.5 nL/s,注射結(jié)束后留針10 min再緩慢退針。注射兩周后對小鼠進行行為學(xué)檢測。

1.2.2步態(tài)分析實驗通過Cat Walk(Noldus)自動化步態(tài)測試,對小鼠的運動量和運動協(xié)調(diào)性進行評價。采用爪印的長度或?qū)挾取⒆τ∨c玻璃板的接觸面積、接觸壓強和步長等靜態(tài)參數(shù),還有擺動速度、站立時間、站立指數(shù)、懸空時間和行走周期時間等動態(tài)參數(shù),評估運動能力。以正常步態(tài)比例、雙足側(cè)向間距、支撐力等為指標,評價運動協(xié)調(diào)能力及姿態(tài)穩(wěn)定性。在收集數(shù)據(jù)時,要保證每只小鼠收集到最少3個有效循環(huán),系統(tǒng)會自動地對所有參數(shù)進行記錄,并取其平均值進行統(tǒng)計分析。

1.2.3免疫印跡法檢測鐵死亡相關(guān)蛋白ACSL4與GPX4的表達行為學(xué)檢測結(jié)束后,處死小鼠,取新鮮的GPe并測定其質(zhì)量。將 RIPA蛋白裂解液加入組織樣品中(每毫克25 μL),機械破碎后將其放置在冰面上30 min,使其完全裂解。然后,以4 ℃、12 000 r/min離心25 min,取出上清,用 BCA蛋白定量試劑盒對其進行測定。將處理好的蛋白樣本進行聚丙烯酰胺凝膠電泳后轉(zhuǎn)PVDF膜(0.45 μm)。用50 g/L脫脂奶粉在室溫下封閉2 h,然后分別加入一抗GPX4 (1∶5 000)、ACSL4 (1∶5 000)和β-actin(1∶10 000)在4 ℃下孵育過夜,再加入山羊抗兔二抗(1∶10 000)室溫孵育1 h。采用 ECL法進行顯影。使用 Image J軟件進行條帶灰度值計算,并以目標蛋白與內(nèi)參照β-actin條帶灰度值之比為指標計算GPX4和ACSL4的相對表達量。

1.3統(tǒng)計學(xué)處理

應(yīng)用Prism 6軟件進行統(tǒng)計學(xué)分析。計量資料數(shù)據(jù)以±s表示,多組均數(shù)比較采用單因素方差分析(One-Way ANOVA),組間兩兩比較使用Turkey法。以P<0.05表示差異有統(tǒng)計學(xué)意義。

2結(jié)果

2.1鐵死亡誘導(dǎo)劑對小鼠運動行為影響

與對照組相比,Erastin組小鼠的右前肢擺動速度升高(F=5.433,q=4.039,P<0.05),右前肢步幅長度增加(F=7.486,q=3.693,P<0.05)。與對照組相比,RSL3組小鼠的右前肢的擺動速度升高、步幅長度增加(F=5.433、7.486,q=4.286、5.446,P<0.05、0.01),左前肢的擺動速度、身體速度均升高(F=4.106、4.745,q=3.966、4.329,P<0.05),右前肢的最大接觸面積和腳印長度均明顯增加(F=6.540、6.465,q=4.286、5.012,P<0.01),右前肢最小強度明顯減小(F=7.281,q=5.397,P<0.01),右后肢的身體速度升高、步幅長度增加(F=3.467、4.111,q=3.715、3.728,P<0.05),左后肢的身體速度升高、步幅長度增加(F=6.242、9.873,q=4.838、6.093,P<0.01、0.001)。見表1。

2.2鐵死亡誘導(dǎo)劑對GPe中ACSL4與GPX4蛋白表達影響

與對照組相比,Erastin組小鼠GPe中GPX4表達下降(F=6.207,q=3.847,P<0.05),ACSL4表達水平不變(F=19.740,q=1.419,Pgt;0.05)。與對照組相比較,RSL3組小鼠GPe中GPX4的表達水平明顯下降(F=6.207,q=4.618,P<0.05),ACSL4的表達水平則明顯升高(F=19.740,q=7.735,P<0.01)。見圖1。

3討論

正常生理狀態(tài)下,基底神經(jīng)節(jié)中鐵含量豐富,以GP和SN鐵含量最高,且隨年齡增長而累積[21-24]。在PD疾病狀態(tài)下,隨著磁共振成像技術(shù)的進步,越來越多的證據(jù)表明SN中的鐵含量高于正常[25]。有證據(jù)表明,PD病人SN中的鐵含量與運動障礙相關(guān)[26]。有研究應(yīng)用磁敏感定量成像(QSM)技術(shù),分析早期PD組和晚期PD組病人的腦鐵含量,發(fā)現(xiàn)PD不同階段鐵積累呈區(qū)域進行性模式,SNc的鐵沉積只在疾病的早期階段受到影響,而黑質(zhì)網(wǎng)狀部、紅核和GP,特別是GPi部分,則在疾病的晚期階段受到影響[27]。除了SN,在PD病人中GP鐵含量也升高[28]。特發(fā)性快速眼動睡眠行為障礙(iRBD)是神經(jīng)退行性疾病的早期征象。QSM評估iRBD病人SN中的鐵含量增加,但是沒有發(fā)現(xiàn)GP中的鐵含量增加,這就說明PD病人GP鐵沉積可能是相對較晚的疾病特征[29]。

GPe是基底神經(jīng)節(jié)運動回路間接通路的關(guān)鍵組成部分,是連接紋狀體到丘腦底核的關(guān)鍵[30-32]。最近的研究表明,GPe中的小清蛋白(PV)神經(jīng)元直接投射到黑質(zhì)網(wǎng)狀部,與小鼠的運動能力直接相關(guān),并可激活基底神經(jīng)節(jié)中的多種核團,包括丘腦底核和GPi。運用化學(xué)遺傳方法特異性滅活PV神經(jīng)元時,神經(jīng)元自發(fā)放電頻率和小鼠運動功能明顯降低,但是小鼠的逆轉(zhuǎn)學(xué)習(xí)不受影響。在6-羥多巴胺誘導(dǎo)的PD模型小鼠中,利用光遺傳技術(shù)特異性激活GPe的PV神經(jīng)元可以顯著提高小鼠在開闊場實驗中的運動速度,提示其運動能力增強[33]。PV神經(jīng)元是GPe占GABA神經(jīng)元比例最高的神經(jīng)元類型,快速高頻放電的特性使其呈現(xiàn)高代謝需求,因此對氧化應(yīng)激特別敏感[34]。有研究報道,在PD病人的尸檢腦組織和6-羥多巴胺誘導(dǎo)的PD模型小鼠中,GPe中PV神經(jīng)元的數(shù)量減少[35-36]。我們推測,PD時GPe鐵沉積很可能通過誘導(dǎo)鐵死亡造成PV神經(jīng)元活動異常從而參與PD運動障礙。

本文實驗結(jié)果表明,在GPe立體定位注射鐵死亡誘導(dǎo)劑RSL3或Erastin兩周后,GPX4蛋白表達水平明顯下降,提示GPe中發(fā)生鐵死亡,但行為學(xué)檢測結(jié)果顯示小鼠運動行為增強。注射RSL3兩周后,ACSL4蛋白的表達水平明顯升高,而Erastin組GPe中ACSL4蛋白沒有變化。其原因可能是兩種藥物的作用靶點以及機制不同,Erastin主要是抑制Xc-系統(tǒng),作用靶點在VDACs,而RSL3主要是與GPX4結(jié)合。有研究表明,在神經(jīng)退行性變初期神經(jīng)元興奮性增加[35-37]。我們推測,GPe注射鐵死亡誘導(dǎo)劑后小鼠運動能力增強,可能與GPe神經(jīng)元興奮性增加有關(guān),代表了GPe神經(jīng)元損傷的初期。本實驗中所使用的鐵死亡誘導(dǎo)劑濃度較低、時間較短,雖然在小鼠的GPe中誘導(dǎo)了明顯的鐵死亡,但此時該腦區(qū)某些神經(jīng)元興奮性卻是升高的而不是降低的,隨著鐵死亡誘導(dǎo)劑濃度增加或者時間的延長可能會損傷神經(jīng)元而導(dǎo)致運動障礙。

綜上所述,本研究進一步證實了GPe與小鼠運動行為相關(guān),為臨床上GPe神經(jīng)元活動異常與PD運動障礙提供了新的實驗證據(jù)。

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(本文編輯于國藝)

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