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The functions for Ras/Ral signaling cascade

Research Project

Project/Area Number 10671109
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field General surgery
Research InstitutionFukui Medical University

Principal Investigator

YAMAGUCHI Akio  Fukui Medical University, First Department of Surgery, Professor, 医学部, 教授 (10174608)

Project Period (FY) 1998 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥2,600,000 (Direct Cost: ¥2,600,000)
Fiscal Year 1999: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1998: ¥1,300,000 (Direct Cost: ¥1,300,000)
KeywordsReps / Ral / RalBPl / small GTPase / RalBP1 / Ra1 / Ra1BP1 / EGFR
Research Abstract

Ras proteins have the capacity to influence a wide variety of cellular processes, including cell cycle control, induction of differentiation, rearrangement of the actin cytoskelton, and apoptosis. We identify another potential binding partner for RalBP1. This protein has an Eps homology (EH) domain and becomes tyrosine-phosphorylated in response to EGF signaling. RalBP1 associated Eps domain-containing protein (Reps) may mediate an additional function of RalBP1. In addition, Reps has the capacity to form a complex with the SH3 domains of the adapter proteins Crk and Grb2, which may link Reps to an EGF-responsive tyrosine kinase. Reps may coordinate the cellular actions of activated EGF receptors and Ral-GTPase.
And we investigated the contribution of the Ral-GEF signaling pathway to NGF-induced differentiation of PC12cells. Ral-GEF signaling opposed the actions of Raf and PI3 kinase signaling. Constitutive elevation of Ral-GEF activity suppressed neurite outgrowth and cell cycle arrest induced by NGF, whereas constitutive inhibition of Ral-GEF activity enhanced the rate of NGF-induced neurite outgrowth and cell cycle exit.
The ratio of activities among Ras effectors and their temporal regulation may be important determinants for cell fate decision between proliferation and differentiation.

Report

(3 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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