細胞蛋白質量關系著生物的生存

<p class="MsoNormal"><span style="mso-spacerun:'yes';font-family:宋體;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:'Times New Roman';font-size:9.0000pt;mso-font-kerning:1.0000pt;"><font face="宋體">在衰老過程中生物維持蛋白質量的能力會逐漸下降，受損蛋白和錯誤折疊蛋白的累積起來會造成細胞死亡和細胞功能故障。阿爾茨海默癥、帕金森癥、亨廷頓舞蹈病等神經退行性疾病就與蛋白質控減弱有關。</font></span><span style="mso-spacerun:'yes';font-family:宋體;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:'Times New Roman';font-size:9.0000pt;mso-font-kerning:1.0000pt;"><o:p></o:p></span></p> <p class="MsoNormal"><span style="mso-spacerun:'yes';font-family:宋體;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:'Times New Roman';font-size:9.0000pt;mso-font-kerning:1.0000pt;">&nbsp;</span></p> <p class="MsoNormal"><span style="mso-spacerun:'yes';font-family:宋體;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:'Times New Roman';font-size:9.0000pt;mso-font-kerning:1.0000pt;"><font face="宋體">人多能干細胞能夠無限復制同時維持未分化狀態，這就需要避免蛋白體系有任何不平衡。幫助蛋白折疊的分子伴侶，在蛋白質控中起到了至關重要的作用。</font>TRiC/CCT<font face="宋體">復合體負責折疊大約</font><font face="Calibri">10%</font><font face="宋體">的細胞蛋白。</font></span><span style="mso-spacerun:'yes';font-family:宋體;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:'Times New Roman';font-size:9.0000pt;mso-font-kerning:1.0000pt;"><o:p></o:p></span></p> <p class="MsoNormal"><span style="mso-spacerun:'yes';font-family:宋體;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:'Times New Roman';font-size:9.0000pt;mso-font-kerning:1.0000pt;"><font face="宋體">我們通過研究多能干細胞的蛋白質控，發現這個復合體受到亞基</font>CCT8<font face="宋體">的調控。調節</font><font face="Calibri">CCT8</font><font face="宋體">可以在體細胞組織增強</font><font face="Calibri">TRiC/CCT</font><font face="宋體">復合體的裝配和活性，進而延長線蟲模型的壽命，延緩老年病的發生。</font></span><span style="mso-spacerun:'yes';font-family:宋體;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:'Times New Roman';font-size:9.0000pt;mso-font-kerning:1.0000pt;"><o:p></o:p></span></p> <p class="MsoNormal"><span style="mso-spacerun:'yes';font-family:宋體;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:'Times New Roman';font-size:9.0000pt;mso-font-kerning:1.0000pt;"><font face="宋體">這項研究表明，表達關鍵亞基</font>CCT8<font face="宋體">足以促進整個體系的裝配，增強蛋白質量和延伸壽命。研究人員將在小鼠中測試自己的發現，希望進一步理解老年病，矯正與蛋白功能障礙有關的缺陷。</font></span><span style="mso-spacerun:'yes';font-family:宋體;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:'Times New Roman';font-size:9.0000pt;mso-font-kerning:1.0000pt;"><o:p></o:p></span></p> <p class="MsoNormal"><span style="mso-spacerun:'yes';font-family:宋體;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:'Times New Roman';font-size:9.0000pt;mso-font-kerning:1.0000pt;">&nbsp;</span></p> <p class="MsoNormal"><span style="mso-spacerun:'yes';font-family:宋體;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:'Times New Roman';font-size:9.0000pt;mso-font-kerning:1.0000pt;">線粒體是細胞內的能源工廠，負責為細胞提供必要能源，也在信號傳導、細胞死亡和細胞生長中起關鍵作用。近年來，越來越多的證據將線粒體功能障礙與衰老、神經退行性疾病關聯起來，比如阿爾茨海默癥、帕金森病和亨廷頓舞蹈病。研究團隊在雜志上發表文章指出，線粒體是大腦退化的關鍵。</span><span style="mso-spacerun:'yes';font-family:宋體;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:'Times New Roman';font-size:9.0000pt;mso-font-kerning:1.0000pt;"><o:p></o:p></span></p> <p class="MsoNormal"><span style="mso-spacerun:'yes';font-family:宋體;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:'Times New Roman';font-size:9.0000pt;mso-font-kerning:1.0000pt;">&nbsp;</span><span style="mso-spacerun:'yes';font-family:宋體;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:'Times New Roman';font-size:9.0000pt;mso-font-kerning:1.0000pt;"><o:p></o:p></span></p> <p class="MsoNormal"><span style="mso-spacerun:'yes';font-family:宋體;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:'Times New Roman';font-size:9.0000pt;mso-font-kerning:1.0000pt;">蛋白質形成往往需要分子伴侶的幫助，確保自己折疊成為正確的結構</span><span style="mso-spacerun:'yes';font-family:宋體;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:'Times New Roman';font-size:9.0000pt;mso-font-kerning:1.0000pt;">，</span><span style="mso-spacerun:'yes';font-family:宋體;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:'Times New Roman';font-size:9.0000pt;mso-font-kerning:1.0000pt;">不過，人們一直不清楚分子伴侶在膜蛋白成熟中起到了怎樣的作用。去年九月，瑞士巴塞爾大學和蘇黎世聯邦理工的研究團隊發現了分子伴侶的新功能。他們的研究顯示，分子伴侶能夠穩定未成熟的細菌膜蛋白，協助它插入到細菌的外膜。</span><span style="mso-spacerun:'yes';font-family:宋體;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:'Times New Roman';font-size:9.0000pt;mso-font-kerning:1.0000pt;"><o:p></o:p></span></p>