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Metformin: Restraining Nucleocytoplasmic Shuttling to Fight Cancer and Aging

Jorge Iván Castillo-Quan1, T Keith Blackwell1

  • 1Research Division, Joslin Diabetes Center, Boston, MA 02215, USA; Department of Genetics and Harvard Stem Cell Institute, Harvard Medical School, Boston MA 02115, USA.

Cell
|December 17, 2016
PubMed

Insights

Metformin extends lifespan and inhibits growth by activating ACAD10. This occurs through a novel pathway where metformin causes the GTPase RagC to be excluded from the nucleus, inhibiting mTORC1.

Area of Science:

  • Cell biology
  • Genetics
  • Metabolism

Background:

  • Metformin is a widely used drug for type 2 diabetes.
  • Its effects on aging and growth are not fully understood.
  • The mechanistic target of rapamycin complex 1 (mTORC1) pathway is crucial for cell growth and metabolism.

Purpose of the Study:

  • To elucidate the molecular mechanism by which metformin influences lifespan and growth.
  • To identify key molecular players in metformin's action.

Main Methods:

  • Experiments were conducted using the model organism *C. elegans*.
  • Human cell lines were utilized for in vitro studies.
  • Investigated the role of GTPase RagC and transcriptional target ACAD10.

Main Results:

  • Metformin treatment led to the nuclear exclusion of the GTPase RagC.
  • This nuclear exclusion resulted in the activation of ACAD10.
  • ACAD10 activation was found to inhibit the mTORC1 pathway.

Conclusions:

  • Identified a novel pathway linking metformin to lifespan extension and growth inhibition.
  • The mechanism involves the regulation of ACAD10 via RagC nuclear exclusion and subsequent mTORC1 inhibition.

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