國家衛生研究院 NHRI:Item 3990099045/4030
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    題名: Caveolin-1 facilitates cyclooxygenase-2 protein degradation
    作者: Chen, SF;Liou, JY;Huang, TY;Lin, YS;Yeh, AL;Tam, K;Tsai, TH;Wu, KK;Shyue, SK
    貢獻者: Institute of Cellular and Systems Medicine
    摘要: Cyclooxygenase-2 (COX-2) plays major roles in diverse physiological and pathological processes such as inflammation and tumorigenesis. Transcriptional control of COX-2 has been extensively investigated and characterized, but its post-translational control is less clear. Here, we report a novel mechanism by which COX-2 is degraded. Protein levels of caveolin-1 (Cav-1) and COX-2 showed an inverse relation in colon cancer cell lines. COX-2 proteins in lung and colon tissues were higher in Cav-1 null mice than in wild-type mice. RNAi knockdown of Cav-1 increased COX-2 protein level and decreased ubiquitinated COX-2 accumulation. In addition, deletion of the carboxy (C)-terminus of COX-2, which contains a unique 19-amino acid segment compared with COX-1, resulted in reduced Cav-1 binding and attenuated COX-2 degradation. COX-1 and green fluorescence protein containing the C-terminus of COX-2 resulted in enhanced degradation. Our findings suggest that Cav-1 binds COX-2 in endoplasmic reticulum (ER) and carries it for degradation via ER associated degradation. The C-terminal region of COX-2 is required for Cav-1 binding and degradation. These results indicate a novel function of Cav-1 in controlling COX-2 expression, which may regulate physiological functions and have tumor suppression effects.
    日期: 2010-02-02
    關聯: Journal of Cellular Biochemistry. 2010 Feb 2;109(2):356-362.
    Link to: http://dx.doi.org/10.1002/jcb.22407
    JIF/Ranking 2023: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=NHRI&SrcApp=NHRI_IR&KeyISSN=0730-2312&DestApp=IC2JCR
    Cited Times(WOS): https://www.webofscience.com/wos/woscc/full-record/WOS:000274471400010
    Cited Times(Scopus): http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=74949124651
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