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Title :Involvement of Protein Kinase D1 in Signal Transduction from the Protein Kinase C Pathway to the Tyrosine Kinase Pathway in Response to Gonadotropin-releasing Hormone
Authors :Higa-Nakamine, Sayomi
Maeda, Noriko
Toku, Seikichi
Yamamoto, Hideyuki
Issue Date :23-Oct-2015
Abstract :The receptor for gonadotropin-releasing hormone (GnRH) belongs to the G protein-coupled receptors (GPCRs), and its stimulation activates extracellular signal-regulated protein kinase (ERK). We found that the transactivation of ErbB4 was involved in GnRH-induced ERK activation in immortalized GnRH neurons (GT1–7 cells). We found also that GnRH induced the cleavage of ErbB4. In the present study, we examined signal transduction for the activation of ERK and the cleavage of ErbB4 after GnRH treatment. Both ERK activation and ErbB4 cleavage were completely inhibited by YM-254890, an inhibitor of G_<q/11> proteins. Down-regulation of protein kinase C (PKC) markedly decreased both ERK activation and ErbB4 cleavage. Experiments with two types of PKC inhibitors, Gö 6976 and bisindolylmaleimide I, indicated that novel PKC isoforms but not conventional PKC isoforms were involved in ERK activation and ErbB4 cleavage. Our experiments indicated that the novel PKC isoforms activated protein kinase D (PKD) after GnRH treatment. Knockdown and inhibitor experiments suggested that PKD1 stimulated the phosphorylation of Pyk2 by constitutively activated Src and Fyn for ERK activation. Taken together, it is highly possible that PKD1 plays a critical role in signal transduction from the PKC pathway to the tyrosine kinase pathway. Activation of the tyrosine kinase pathway may be involved in the progression of cancer.
URL :http://dx.doi.org/10.1074/jbc.M115.681700
Type Local :雑誌掲載論文
ISSN :1083-351X
0021-9258
Publisher :American Society for Biochemistry and Molecular Biology
URI :http://hdl.handle.net/20.500.12000/46586
Citation :Journal of Biological Chemistry Vol.290 no.43 p.25974 -25985
Appears in Collections:Peer-reviewed Journal Articles (Faculty of Medicine)

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