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Ras in signal transduction.

T Satoh1, Y Kaziro

  • 1DNAX Research Institute, Palo Alto, CA 94304.

Seminars in Cancer Biology
|August 1, 1992
PubMed
Summary
This summary is machine-generated.

Ras protein, a key signal transducer, is activated by tyrosine kinases. Its active form (Ras.GTP) triggers diverse cellular responses like proliferation and differentiation, though downstream targets remain unclear.

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Area of Science:

  • Molecular Biology
  • Cell Signaling

Background:

  • Ras protein functions as a GTP-binding signal transducer in various cell types, including fibroblasts, lymphocytes, myeloid cells, and neurons.
  • Activation of Ras is crucial for cellular responses to external stimuli.

Purpose of the Study:

  • To elucidate the role of tyrosine kinases in Ras protein activation.
  • To understand the signaling pathways mediating Ras activation.
  • To explore the downstream effects and cellular phenotypes resulting from active Ras.GTP.

Main Methods:

  • The study focuses on the known interactions and regulatory mechanisms of Ras protein.
  • It reviews the involvement of tyrosine kinases, GDP/GTP exchange regulators, and GTPase stimulatory proteins in the Ras signaling pathway.
  • Phenotypic outcomes of Ras.GTP activation are discussed in relation to cell types.

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Main Results:

  • Tyrosine kinases, associated with receptors, are critical for Ras activation by extracellular signals.
  • GDP/GTP exchange regulators and GTPase stimulatory proteins mediate signals from kinases to Ras.
  • Active Ras.GTP induces varied cellular phenotypes, including proliferation, transformation, activation, and differentiation.

Conclusions:

  • Ras protein is a central mediator of signal transduction pathways.
  • The precise primary target of active Ras.GTP and the mechanisms determining downstream cellular phenotypes require further investigation.