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    Biochem Biophys Res Commun. 2001 Aug 17;286(2):274-80.

    Downregulation of phospholipase C delta3 by cAMP and calcium.

    Lin FG, Cheng HF, Lee IF, Kao HJ, Loh SH, Lee WH.

    Source

    Graduate Institute of Life Sciences, National Defense Medical Center, Taipei, Taiwan.

    Abstract

    Four different isoforms of mammalian phospholipase C delta (PLCdelta) have been described. PLCdelta1, the best-understood isoform, is activated by an atypical GTP-binding protein. It has been suggested that it is a calcium signal amplifier. However, very less is known about other subtypes, including PLCdelta3. Therefore, in the present study, we examined the expression of PLCdelta3 in different human tissues. Moreover, the cellular underlying regulation for PLCdelta3 was studied in different cell lines. Our study showed that the mRNA and protein levels differed significantly among human tissues. The human PLCdelta3 gene was composed of 15 exons and 1 putative cAMP response element in the 5'-end promoter region. PLCdelta3 mRNA expression was downregulated by cAMP and calcium in both the human normal embryonic lung tissue diploid WI38 cell line and the glioblastoma/astrocytoma U373 cell line. However, mRNA expression showed no impact by PKC activators or inhibitors. This study shows the human PLCdelta3 expression pattern and is the first report that PLCdelta3 gene expression is downregulation by cAMP and calcium.

    Copyright 2001 Academic Press.

    PMID:
    11500033
    [PubMed - indexed for MEDLINE]

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