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Extracellular matrix internalization links nutrient signalling to invasive migration.

Elena Rainero1

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Extracellular matrix proteins, like integrins, are internalized by cells and activate the mechanistic target of rapamycin (mTOR) pathway. This suggests the extracellular matrix can serve as a nutrient source, especially when other nutrients are scarce.

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Area of Science:

  • Cell biology
  • Molecular biology
  • Biochemistry

Background:

  • Integrins mediate cell-extracellular matrix (ECM) interactions, connecting the ECM to the actin cytoskeleton.
  • Integrins are internalized and can be recycled or degraded.
  • Integrins can be endocytosed with their ECM ligands.

Purpose of the Study:

  • To review how extracellular protein endocytosis influences the mechanistic target of rapamycin (mTOR) pathway.
  • To explore the hypothesis that ECM components can act as nutrient sources.

Main Methods:

  • Literature review focusing on integrin endocytosis and mTOR pathway activation.
  • Analysis of studies investigating extracellular protein uptake and cellular metabolism.

Main Results:

  • Extracellular protein (including ECM) endocytosis impacts mTOR pathway activation.
  • mTOR pathway activation is a key regulator of cell metabolism and growth.

Conclusions:

  • ECM components may function as nutrient sources, particularly under nutrient-depleted conditions.
  • Cellular uptake of ECM proteins has implications for cell metabolism and survival.