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Related Experiment Videos

Nutrient-responsive mTOR signalling grows on Sterile ground.

Simon J Cook1, Simon J Morley

  • 1Laboratory of Molecular Signalling, The Babraham Institute, Babraham Research Campus, Cambridge, CB22 3AT, UK. simon.cook@bbsrc.ac.uk

The Biochemical Journal
|March 10, 2007
PubMed
Summary
This summary is machine-generated.

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Mitogen-activated protein kinase kinase kinase kinase-3 (MAP4K3) is identified as a novel nutrient-responsive regulator of the mammalian target of rapamycin (mTOR) pathway. This kinase promotes cell growth and may be a potential drug target for cancer therapy.

Area of Science:

  • Cellular Biology
  • Molecular Signaling
  • Biochemistry

Background:

  • Mammalian target of rapamycin (mTOR) controls cell growth by regulating ribosome biogenesis and protein translation.
  • mTOR activity is modulated by growth factors (e.g., insulin/IGF-1) and nutrient availability, particularly amino acids.
  • While the growth factor-regulated mTOR pathway is well-understood, the nutrient-sensing mechanisms remain less clear.

Purpose of the Study:

  • To elucidate the molecular mechanisms underlying nutrient-responsive mTOR signaling.
  • To identify novel components involved in amino acid-sensing pathways that regulate mTOR.
  • To investigate the role of MAP4K3 (also known as GLK) in nutrient-mediated mTOR activation and cell growth.

Main Methods:

  • Assessed the activity of MAP4K3 in response to amino acids and growth factors.

Related Experiment Videos

  • Determined the sensitivity of MAP4K3 activity to rapamycin.
  • Examined the effect of MAP4K3 on the phosphorylation of known mTOR targets (e.g., S6K1).
  • Investigated the impact of MAP4K3 knockdown on cell size.

    • Main Results:

    • MAP4K3 activity is stimulated by amino acids but not by growth factors, and is rapamycin-insensitive, suggesting it acts upstream of mTOR.
    • MAP4K3 is essential for the phosphorylation of mTOR targets like S6K1.
    • Overexpression of MAP4K3 enhances the phosphorylation of these targets.
    • Knockdown of MAP4K3 leads to a reduction in cell size.

    Conclusions:

    • MAP4K3 is a newly identified component of the nutrient-responsive pathway regulating mTOR.
    • MAP4K3 plays a crucial role in promoting cell growth.
    • MAP4K3 represents a potential therapeutic target for inhibiting mTOR signaling in cancer.