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Insulin stimulates glucose transport via protein kinase G type I alpha-dependent pathway in podocytes

Agnieszka Piwkowska1, Dorota Rogacka1, Stefan Angielski1

  • 1Mossakowski Medical Research Centre Polish Academy of Sciences, Laboratory of Molecular and Cellular Nephrology, Gdańsk, Poland.

Biochemical and Biophysical Research Communications
|March 8, 2014
PubMed

Insights

Cyclic-GMP-dependent protein kinase (PKG) plays a role in how podocytes respond to insulin. This finding offers new insights into diabetic podocytopathy (DP) and insulin resistance in kidney cells.

Area of Science:

  • Nephrology
  • Endocrinology
  • Molecular Biology

Background:

  • Diabetic podocytopathy (DP) is a major complication of diabetes.
  • Insulin resistance in podocytes may contribute to DP pathogenesis.
  • Disruptions in protein kinase signaling are implicated in DP.

Purpose of the Study:

  • To investigate the role of cyclic-GMP-dependent protein kinase (PKG) in insulin regulation of glucose transport in podocytes.
  • To determine if PKG activity influences insulin sensitivity in podocyte glucose uptake.

Main Methods:

  • Cultured rat podocytes were used to measure insulin-dependent glucose uptake.
  • PKG activity was modified using pharmacological activators and inhibitors.
  • Biochemical methods included siRNA targeting PKG-Iα and the insulin receptor β subunit.

Main Results:

  • PKG was found to participate in insulin-stimulated glucose transport in podocytes.
  • Modifying PKG activity altered the response of glucose transport to insulin.
  • Findings suggest PKG influences insulin resistance in podocyte glucose transport.

Conclusions:

  • PKG is involved in the regulation of glucose transport by insulin in podocytes.
  • PKG may be a key mediator in the development of insulin resistance in diabetic podocytopathy.
  • These findings provide novel insights into the molecular mechanisms underlying DP.
Keywords:
GlucoseHydrogen peroxideInsulin receptorPodocyteProtein kinase G type I alpha

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