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Differentiated Mouse Adipocytes in Primary Culture: A Model of Insulin Resistance
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Molecular mechanism of insulin resistance

Samir Bhattacharya1, Debleena Dey, Sib Sankar Roy

  • 1Cellular and Molecular Endocrinology Laboratory, Department of Zoology, School of Life Science, Visva-Bharati (A Central University), Santiniketan 731 235, India. smrbhattacharya@yahoo.co.in

Journal of Biosciences
|April 17, 2007
PubMed

Insights

Free fatty acids, like palmitate, contribute to insulin resistance by reducing insulin receptor (IR) expression. This occurs via PDK1-independent phosphorylation of PKC(eta), impacting type 2 diabetes development.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Endocrinology

Background:

  • Free fatty acids are implicated in insulin resistance and type 2 diabetes.
  • The precise molecular mechanisms driving this process remain incompletely understood.

Purpose of the Study:

  • To elucidate the mechanism by which fatty acids induce insulin resistance.
  • To identify key molecular players involved in the regulation of insulin receptor gene expression.

Main Methods:

  • Investigated the effect of palmitate on insulin receptor (IR) gene expression.
  • Examined the role of PDK1-independent phosphorylation of PKC(eta) in this process.

Main Results:

  • Palmitate was found to inhibit insulin receptor (IR) gene expression.
  • This inhibition leads to decreased IR protein levels in target cells.
  • PDK1-independent phosphorylation of PKC(eta) was identified as a key mediator.

Conclusions:

  • Fatty acids, specifically palmitate, can induce insulin resistance through downregulation of insulin receptor gene expression.
  • The PKC(eta) pathway plays a critical role in mediating fatty acid-induced insulin resistance.

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