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Related Experiment Videos

p70s6k function is essential for G1 progression

H A Lane1, A Fernandez, N J Lamb

  • 1Friedrich Miescher Institute, Basel, Switzerland.

Nature
|May 13, 1993
PubMed
Summary
This summary is machine-generated.

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The p70s6k kinase is crucial for cell proliferation, regulating protein synthesis and gene expression. Inhibiting p70s6k blocks cell cycle entry, highlighting its role in growth factor signaling.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Cellular proliferation is driven by growth factors, requiring increased protein synthesis.
  • Ribosomal protein S6 (rpS6) phosphorylation is a key regulator of protein synthesis.
  • p70s6k is the primary kinase responsible for rpS6 phosphorylation.

Purpose of the Study:

  • To investigate the role of p70s6k in the mitogenic response.
  • To determine if p70s6k is essential for growth factor-induced cellular proliferation.

Main Methods:

  • Microinjection of quiescent rat embryo fibroblasts with antibodies targeting p70s6k.
  • Assessing serum-induced entry into S phase.
  • Measuring protein synthesis activation and c-fos expression.

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Main Results:

  • Antibodies to p70s6k abolished serum-induced entry into S phase.
  • p70s6k inhibition abrogated protein synthesis and c-fos expression.
  • Inhibition of DNA synthesis occurred even when antibodies were introduced late in G1 phase.

Conclusions:

  • p70s6k is essential for the mitogenic response, controlling protein synthesis and c-fos expression.
  • p70s6k activity is required throughout G1 phase for DNA synthesis.
  • p70s6k represents a critical node in growth factor signaling pathways.