VPS34泛素化機(jī)制研究及其與阿爾茲海默病關(guān)系探討
發(fā)布時間:2020-07-01 10:29
【摘要】:VPS34(Vacuolar protein-sorting 34)在自噬和內(nèi)體轉(zhuǎn)運中發(fā)揮了重要的作用。在AD患者腦組織及其病理模型鼠APP/PS1小鼠腦組織中,VPS34激酶活性降低,并且VPS34會影響APP內(nèi)吞轉(zhuǎn)運。提示VPS34與AD發(fā)病機(jī)制有關(guān)。我們推測VPS34泛素化會改變其蛋白水平。但是,我們研究發(fā)現(xiàn)VPS34泛素化并不影響其蛋白水平。使用泛素野生型質(zhì)粒及其各位點突變質(zhì)粒與VPS34瞬時共轉(zhuǎn)染HEK293細(xì)胞,發(fā)現(xiàn)VPS34可以發(fā)生各種類型的多聚泛素化修飾。泛素野生型及各突變位點質(zhì)粒轉(zhuǎn)染HEK393細(xì)胞,內(nèi)源性VPS34蛋白水平?jīng)]有改變。并且,我們發(fā)現(xiàn)VPS34既可以通過蛋白酶體也可以溶酶體途徑降解,使用蛋白酶體抑制劑MG132或溶酶體抑制劑氯喹的干預(yù)下,VPS34蛋白水平在12和18小時沒有改變,但在24小時明顯升高,表明VPS34在18小時內(nèi)相對穩(wěn)定。在6、12月齡APP/PS1小鼠腦組織中,Vps34蛋白水平保持不變,但是VPS34的泛素化水平明顯降低,表明VPS34的泛素化和蛋白水平的改變在APP/PS1小鼠中不一致。這些結(jié)果表明VPS34泛素化修飾不改變其蛋白水平。
【學(xué)位授予單位】:重慶醫(yī)科大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2019
【分類號】:R749.16
【圖文】:
⑹ 取上述 DNA 模板,配置反應(yīng)體系,跑 PCR,PCR 程序為 95℃ 5min,95℃15S 60℃ 15S 72℃ 20 S,72℃ 10min,PCR 體系為:Taq mix 2* 10ul滅菌雙蒸水 6 ul引物 F/R 2ul鼠尾 DNA 2ul⑺ 配置 1.5%瓊脂糖膠:0.5* TBE 100ml瓊脂糖 1.5ggoldview 5ul入微波爐高火 2min,取出,待溫度降至 60-70℃左右倒入制膠模具。⑻ 上樣,按順序加入 100bp DNA maker,PCR 產(chǎn)物。電泳 120 V,30min。于Fusion 成像顯影,350bp 與 608bp 均有條帶即為 APP/PS1 雙轉(zhuǎn)小鼠。
圖 1 泛素化修飾不改變 VPS34 蛋白水平Figure1 Ubiquitnation does not alter Vps34 protein levels(A) Representative Western blots of HA-tagged ubiquitin (top) and Flag-tagged VPS34 (bottn HEK293 cells co-transfected with VPS34 and ubiquitin constructs WT, K0, K6, K11, K29, K48 and K63, respectively.After 44 h of transfection, cells were treated with MG132 (20 M) for efore harvest. (B) Representative Western blots of HA-tagged ubiquitin (top) and Flag-taggPS34 (bottom) in cell extracts immunoprecipitated by Flag-Vps34 antibody. Samples were takrom A. (C) Representative Western blots of ubiquitin (HA-tag) in HEK293 cells transienxpressing vector, or ubiquitin constructs WT, K0, K6, K11,K27,K29, K33, K48 and Kespectively. Cells were treated with MG132 (20 M) for 4 h before sample was harvested. (epresentative Western blots (top) and quantification (bottom) of endogenous Vps34 in sampaking from C.
【學(xué)位授予單位】:重慶醫(yī)科大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2019
【分類號】:R749.16
【圖文】:
⑹ 取上述 DNA 模板,配置反應(yīng)體系,跑 PCR,PCR 程序為 95℃ 5min,95℃15S 60℃ 15S 72℃ 20 S,72℃ 10min,PCR 體系為:Taq mix 2* 10ul滅菌雙蒸水 6 ul引物 F/R 2ul鼠尾 DNA 2ul⑺ 配置 1.5%瓊脂糖膠:0.5* TBE 100ml瓊脂糖 1.5ggoldview 5ul入微波爐高火 2min,取出,待溫度降至 60-70℃左右倒入制膠模具。⑻ 上樣,按順序加入 100bp DNA maker,PCR 產(chǎn)物。電泳 120 V,30min。于Fusion 成像顯影,350bp 與 608bp 均有條帶即為 APP/PS1 雙轉(zhuǎn)小鼠。
圖 1 泛素化修飾不改變 VPS34 蛋白水平Figure1 Ubiquitnation does not alter Vps34 protein levels(A) Representative Western blots of HA-tagged ubiquitin (top) and Flag-tagged VPS34 (bottn HEK293 cells co-transfected with VPS34 and ubiquitin constructs WT, K0, K6, K11, K29, K48 and K63, respectively.After 44 h of transfection, cells were treated with MG132 (20 M) for efore harvest. (B) Representative Western blots of HA-tagged ubiquitin (top) and Flag-taggPS34 (bottom) in cell extracts immunoprecipitated by Flag-Vps34 antibody. Samples were takrom A. (C) Representative Western blots of ubiquitin (HA-tag) in HEK293 cells transienxpressing vector, or ubiquitin constructs WT, K0, K6, K11,K27,K29, K33, K48 and Kespectively. Cells were treated with MG132 (20 M) for 4 h before sample was harvested. (epresentative Western blots (top) and quantification (bottom) of endogenous Vps34 in sampaking from C.
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