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Effects of PACAP on the gene expression of catecholamine synthesizing enzymes.

Research Project

Project/Area Number 06671000
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 内分泌・代謝学
Research InstitutionUniversity of Tsukuba

Principal Investigator

ISOBE Kazumasa  Institute of Clinical Medicine University of Tsukuba, Lectuer, 臨床医学系, 講師 (10151440)

Co-Investigator(Kenkyū-buntansha) NAKAI Toshiaki  Institute of Clinical Medicine University of Tsukuba, Professor, 臨床医学系, 教授 (30049192)
NOMURA Fumio  Institute of Clinical Medicine University of Tsukuba, Assistant Professor, 臨床医学系, 助教授 (80164739)
Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1995: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1994: ¥1,200,000 (Direct Cost: ¥1,200,000)
KeywordsPACAP / mRNA / catecholamine synthesis / adrenal medulla / tyrosine hydroxylase / dopamine-beta-hydroxylase / ドーパミンβヒドロキシラーゼ / カテコラミン合成 / THmRNA / DBHmRNA
Research Abstract

Pituitary adenylate cyclase-activating polypeptide (PACAP), a potent stimulant for catecholamine secretion, stimulated catecholamine production in cultured porcine adrenal medullary chromaffin cells. PACAP induced dose-and time-dependent increases in mRNAs for the catecholamine synthesizing enzymes, tyrosine hydroxylase (TH) and dopamine b-hydroxylase (DBH), with maximal 6-and 4-fold increases occuring at 8 to 16h, respectively. The half-maximally and maximally effective PACAP concentrations for stimulation of TH and DBH gene expression were 0.5 and 0.3 nM,respectively. The TH-protein level also showed an increase over the unstimulated basal level at 16 to 24h in PACAP-stimulated cells.
We previously demonstrated that PACAP activates both phospholipase C and adenylate cyclase in adrenal medullary cells. Addition of forskolin alone induced increases in mRNA expression of both TH and DBH.The phosphodiesterase inhibior 3-isobutyl-1-methylxanthine potentiated the induction of TH and DBH mRNA by PACAP.Addition of the protein kinase C activator phorbol 12-myristate 13-acetate (PMA) also caused increases in TH and DBH mRNA levels. In protein kinase C-downregulated cells pretrearted with PMA for 24h, the stimulatory effect of PACAP on TH and DBH gene expression was diminished. These results suggest that cAMP and protein kinase C mediated the PACAP-induced TH and DBH gene expression. Removal of extracellular Ca2+with EGTA enhanced the PACAP-induced increases in both cellular cAMP and mRNA levels of TH and DBH mRNAs.
In conclusion, the present study indicates that PACAP coordinately up-regulates the gene expression of both TH and DBH by activating the cAMP and protein kinase C signaling pathway, leading to stimulation of catecholamine synthesis, while Ca2+negatively regulates TH and DBH gene expression in adrenal medullaru cells.

Report

(3 results)
  • 1995 Annual Research Report   Final Research Report Summary
  • 1994 Annual Research Report
  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] Kazumasa Isobe, et al: "Pituitary adenylate cyclase-activating polypeptide induces gene expression of the catecholamine synthesizing enzymes, tyrosinde hydroxylase and…" Neuropeptides.(in press). (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Kazumasa Isobe, et al: "Pituitary adenylate cyclase-activating polypeptide induces gene expression of the catecholamine synthesizing enzymes, tyrosinde hydroxylase and…" The annals of the New York Academy of Sciences.(in press). (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Kazumasa Isobe, Nobuyasu Yukimasa, Toshiaki Nakai, and Yoh Takuwa: "Pituitary adenylate cyclase-activating polypeptide induces gene expression of the catecholamine synthesizing enzymes, tyrosinde hydroxylase and dopamine beta-hydroxylase, through3', 5'-cyclic adenosine monophosphate-and protein kinase C dependent mechanisms in cultured porcine adrenal medullary chromaffin cells." Neuropeptides. (in press). (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Kazumasa Isobe, Nobuyasu Yukimasa, Toshiaki Nakai, and Yoh Takuwa: "Pituitary adenylate cyclase-activating polypeptide induces gene expression of the catecholamine synthesizing enzymes, tyrosinde hydroxylase and dopamine beta-hydroxylase, in cultured porcine adrenal medullary chromaffin cells." The annals of the New York Academy of Sciences. (in press). (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Kazumasa Isobe, et al: "Pituitary adenylate cyclase-activating polypeptide induces gene expression of the catecholamine synthesizing enzymes, tyrosinde hydroxylase and..." Neuropeptides. (印刷中). (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] Kazumasa Isobe,et al: "Pituitary adenylate cyclase-activating polypeptide induces gene expression of the catecholamine synthesizing enzymes, tyrosinde hydroxylase and..." The annals of New York Academy of Sciences. (印刷中).

    • Related Report
      1995 Annual Research Report
  • [Publications] Kazumasa Isobe,et al: "Pituitary adenylate cyclase-activating polypeptide induces gene expression of the catecholamine synthesizing enzymes, tyrosinde hydroxylase and..." The annals of New York Academy of Sciences. (印刷中). (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] 磯部 和正: "カテコールアミン合成・分泌の分子生物学的研究-第一報、PACAPの合成系への作用-" 日本内分泌学会雑誌. 70. 265 (1994)

    • Related Report
      1994 Annual Research Report

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Published: 1994-04-01   Modified: 2016-04-21  

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