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Signaling to the ribosome in cancer--It is more than just mTORC1

Katherine M Hannan1, Elaine Sanij, Nadine Hein

  • 1Growth Control and Differentiation Program, Peter MacCallum Cancer Centre, St. Andrews Place, East Melbourne, VIC, Australia.

IUBMB Life
|March 2, 2011
PubMed

Insights

Dysregulated protein synthesis, controlled by the ribosome, drives tissue overgrowth diseases. The PI3K/AKT/mTORC1 pathway is key to ribosome regulation in health and disease, offering therapeutic targets.

Area of Science:

  • Molecular Biology
  • Cellular Biology
  • Disease Pathogenesis

Background:

  • Dysregulation of protein synthesis is linked to diseases involving tissue overgrowth, such as cancer and cardiac hypertrophy.
  • The ribosome is a central regulator of protein synthesis, integrating signals from key growth pathways like RAS, MYC, and PI3K.
  • Coordinated control of ribosome synthesis and function is crucial for regulating cell growth and maintaining homeostasis.

Purpose of the Study:

  • To review the role of the PI3K/AKT/mammalian target of rapamycin complex 1 (mTORC1) pathway in ribosome regulation.
  • To explore the interplay between PI3K/AKT/mTORC1, RAS, and MYC pathways in controlling protein synthesis.
  • To discuss the therapeutic potential of targeting this regulatory network in disease.

Main Methods:

  • Literature review and synthesis of existing research on protein synthesis regulation.
  • Analysis of signaling pathways involved in ribosome biogenesis and function.
  • Examination of the connection between pathway dysregulation and disease phenotypes.

Main Results:

  • The PI3K/AKT/mTORC1 pathway plays a critical role in controlling ribosome biogenesis and protein synthesis rates.
  • Convergence of RAS, MYC, and PI3K signaling pathways on the ribosome ensures coordinated cell growth.
  • Aberrant activation of these pathways contributes to pathological tissue overgrowth.

Conclusions:

  • The PI3K/AKT/mTORC1 pathway is a key mediator of ribosome function in both physiological and pathological conditions.
  • Understanding the crosstalk between growth signaling pathways and ribosome regulation offers insights into disease mechanisms.
  • Targeting the PI3K/AKT/mTORC1 network presents a promising therapeutic strategy for diseases characterized by excessive tissue growth.

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