國家衛生研究院 NHRI:Item 3990099045/2160
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    題名: Stimulation of c-Rel transcriptional activity by PKA catalytic subunit beta
    其他題名: Stimulation of c-Rel transcriptional activity by PKA catalytic subunit ß
    作者: Yu, SH;Chiang, WC;Shih, HM;Wu, KJ
    貢獻者: Division of Molecular and Genomic Medicine
    摘要: Nuclear factor kappaB (NF-kappaB) is a eukaryotic transcription factor which responds to different extracellular signals. It is involved in immune response, inflammation, and cell proliferation. Increased expression of c-Rel (or its viral homolog v-Rel), one component of the NF-kappaB factors, induces tumorigenesis in different systems. The activity of NF-kappaB can be regulated by protein kinase A (PKA) in a cAMP-independent manner. Our previous results showed that c-MYC induces the activity of PKA by inducing the transcription of the gene encoding the PKA catalytic subunit beta (PKA-Cbeta). Constitutive expression of PKA-Cbeta in Rat1a cells induces their transformation. Here we show that CREB is unlikely to be a phosphorylation target of PKA-Cbeta as characterized by different cell lines. Electrophoretic mobility shift assays showed that c-Rel is present as a significant component of the NF-kappaB factors in c-MYC overexpressing status. The transcriptional activity of c-Rel was significantly stimulated by PKA-Cbeta. Coactivators p300/CBP are at least partially responsible for the enhanced activation mediated by c-Rel and PKA-Cbeta. Interaction between c-Rel and PKA-Cbeta was demonstrated using coimmunoprecipitation assays. Immunoprecipitation-in vitro phosphorylation assays showed the direct phosphorylation of c-Rel by PKA-Cbeta. These results indicate that c-Rel is a reasonable phosphorylation target of PKA-Cbeta, and that the transcriptional activity of c-Rel is stimulated by PKA-Cbeta possibly through the interaction with p300/CBP.
    關鍵詞: Genetics & Heredity;Medicine, Research & Experimental
    日期: 2004-09
    關聯: Journal of Molecular Medicine. 2004 Sep;82(9):621-628.
    Link to: http://dx.doi.org/10.1007/s00109-004-0559-7
    JIF/Ranking 2023: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=NHRI&SrcApp=NHRI_IR&KeyISSN=0946-2716&DestApp=IC2JCR
    Cited Times(WOS): https://www.webofscience.com/wos/woscc/full-record/WOS:000224274700008
    Cited Times(Scopus): http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=4744346709
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