Induction and regulation of human interleukin 2 gene expression: Significance of protein kinase C activation

Yusei Yamamoto, Takafumi Ohmura, Kazuyoshi Kawakami, Kaoru Onoue, Hiroyoshi Hidaka

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

Phytohemagglutinin (PHA) and a tumor-promoting phorbol ester, 12-0-tetrade-canoylphorbol-13-acetate (TPA) act synergistically to induce interleukin 2 (DL2) mRNA in human lymphocytes in vitro. The induction was inhibited by a potent inhibitor of protein kinase C (C-kinase), 1-(5-isoquinolinylsulfonyI)-2-methylpipera-zine (H-7) at less than 10 μM. H-7 inhibited C-kinase activity itself in lymphocytes at the same range of the concentration but did not interfere with the translocation of C-kinase from the cytosol to the membrane fraction of the lymphocytes induced by TPA. H-7 is also known to inhibit cAMP-dependent protein kinase (A-kinase) and cGMP-dependent protein kinase (G-kinase). However, the lymphocytes cultured with dibutyryl cAMP or dibutyryl cGMP could not be activated to produce IL2 mRNA. These results show that activation of C-kinase but not A-kinase and G-kinase is necessary in signal transduction for IL2 gene expression. Prostaglandin E,, which is known to elevate intracellular cAMP level, also inhibited IL2 mRNA induction in the lymphocytes stimulated with PHA and TPA. Addition of a-methylornithine and methylglyoxal bis (guanyl hydrazone), which inhibit polyamine synthesis, did not affect the induction of IL2 mRNA in the lymphocytes stimulated with PHA and TPA, indicating that polyamine synthesis is not necessary for IL2 mRNA induction.

Original languageEnglish
Pages (from-to)333-340
Number of pages8
JournalJournal of biochemistry
Volume100
Issue number2
DOIs
Publication statusPublished - 1986 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology

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