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《單側(cè)黑質(zhì)紋狀體通路損毀改變腹側(cè)蒼白球的神經(jīng)活動》由會員上傳分享,免費在線閱讀,更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫。
1、單側(cè)黑質(zhì)紋狀體通路損毀改變腹側(cè)蒼白球的神經(jīng)活動作者:張巧俊,楊慧麗,顏虹,藺雪梅,向莉,劉健【摘要】 目的觀察單側(cè)黑質(zhì)紋狀體通路損毀對大鼠腹側(cè)蒼白球(ventralpallidum,VP)神經(jīng)元電活動的影響。方法采用在體細胞外記錄方法研究正常大鼠和帕金森病(Parkinsonsdisease,PD)大鼠VP神經(jīng)元放電頻率和放電形式的變化。結(jié)果對照組大鼠VP神經(jīng)元的平均放電頻率為(16.1±1.2)Hz(n=41);2周和4周PD組大鼠VP神經(jīng)元的平均放電頻率分別是(9.3±0.8)Hz(n=43)和(8.6±1.0)Hz(n=47),與對照組相比,V
2、P神經(jīng)元的平均放電頻率顯著減低(P均<0.001),但兩PD模型組之間VP神經(jīng)元的平均放電頻率無明顯差異(P>0.05)。在對照組大鼠,規(guī)則放電的神經(jīng)元占44%(18/41),不規(guī)則放電的神經(jīng)元占52%(21/41),爆發(fā)式放電的神經(jīng)元僅占4%(2/41);在2周和4周PD模型組大鼠,具有規(guī)則、不規(guī)則和爆發(fā)式放電的VP神經(jīng)元的百分比分別為14%(6/43)、47%(20/43)、39%(17/43)和17%(8/47)、49%(23/47)、34%(16/47),2周和4周PD組大鼠VP中爆發(fā)式放電的神經(jīng)元明顯多于對照組(P均<0.01
3、),而兩PD模型組之間VP神經(jīng)元的放電形式未見顯著性差異(P>0.05)。結(jié)論單側(cè)黑質(zhì)紋狀體通路損毀誘發(fā)大鼠VP神經(jīng)元的放電頻率降低,具有爆發(fā)式放電的神經(jīng)元增多,這種變化可能與伏核VP的抑制性神經(jīng)傳遞增強有關(guān)。14【關(guān)鍵詞】腹側(cè)蒼白球;帕金森??;電生理學(xué);大鼠 ABSTRACT:ObjectiveToinvestigatethechangesinneuronalactivityoftheratventralpallidum(VP)followingunilaterallesionofthenigroatriatalpathway.Methods
4、ThechangesinthefiringfrequencyandfiringpatternofVPneuronswereexaminedwithextracellularrecordingmethodsincontrolandParkinsonsdisease(PD)rats.ResultsTheresultsshowedthatthemeanfiringfrequencyofVPneuronsincontrolratswas(16.1±1.2)Hz(n=41).InPDrats,themeanfiringfrequencyofVPneuronsaf
5、terunilaterallesionofthenigroatriatalpathwayatweek2and4was(9.3±0.8)Hz(n=43)and(8.6±1.0)Hz(n=47),respectively.ThemeanfiringfrequencyofVPneuronsofPDratsatweek2and4wassignificantlydecreasedwhencomparedtothatofcontrolrats(allP<0.001).However,therewasnosignificantdifferenceinthemea
6、nfiringfrequencyofVPneuronsofPDratsatweek2and4(P>0.05).Concerningthefiringpattern,44%(18/41)ofVPneuronsfiredregularly,52%(21/41)exhibitedirregularityand4%firedinburstsincontrolrats.InPDrats,14%(6/43)ofVPneuronsfiredregularly,47%(20/43)irregularlyand39%inburstsatweek2;1417%(8/4
7、7)ofVPneuronsfiredregularly,49%(23/47)irregularlyand34%(16/47)inburstsatweek4,respectively.ThepercentageofPDratsneuronfiringinburstsatweek2and4wassignificantlyhigherthanthatincontrolrats(allP<0.01),butthedifferenceinPDratsfiringpatternbetweenweek2and4didnotreachasignificantl
8、evel(P>0.05).ConclusionUnilaterallesi