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Focal adhesion kinase negatively regulates neuronal insulin resistance

Amit Gupta1, Bharti Bisht, Chinmoy Sankar Dey

  • 1Department of Biotechnology, National Institute of Pharmaceutical and Research, Nagar, India.

Biochimica Et Biophysica Acta
|February 28, 2012
PubMed

Insights

Focal adhesion kinase (FAK) negatively regulates insulin signaling in neurons, unlike in other tissues. Reducing FAK improves insulin sensitivity and glucose uptake in nerve cells, revealing a novel therapeutic target.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Biochemistry

Background:

  • Focal adhesion kinase (FAK) is a protein kinase involved in cell survival and cancer.
  • FAK regulates insulin resistance in peripheral tissues like muscle and liver.
  • Its role in neuronal insulin signaling is not well understood.

Purpose of the Study:

  • To investigate the role of FAK in insulin/phosphatidyl inositol 3-kinase (PI3K) signaling in neurons.
  • To determine if FAK acts as a positive or negative regulator of insulin signaling in neuronal cells.

Main Methods:

  • Utilized Neuro-2a (N2A) cells and primary cortical neurons.
  • Induced insulin resistance in N2A cells.
  • Employed RNA interference (RNAi) for FAK gene silencing.
  • Measured insulin/PI3K signaling and glucose uptake.

Main Results:

  • Observed increased FAK tyrosine phosphorylation in insulin-resistant N2A cells.
  • FAK downregulation via RNAi ameliorated impaired insulin/PI3K signaling and glucose uptake in N2A cells.
  • FAK silencing enhanced glucose uptake in primary cortical neurons.

Conclusions:

  • FAK acts as a negative regulator of insulin/PI3K signaling in neurons.
  • This contrasts with FAK's role in peripheral tissues, highlighting cell-type specific functions.
  • Findings suggest caution in using FAK modulators as therapeutics due to differential effects.

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