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Insulin resistance in glomerular podocytes: Potential mechanisms of induction

Dorota Rogacka1

  • 1Mossakowski Medical Research Institute, Polish Academy of Sciences, Laboratory of Molecular and Cellular Nephrology, Wita Stwosza 63, 80-308, Gdansk, Poland; University of Gdansk, Faculty of Chemistry, Department of Molecular Biotechnology, Wita Stwosza 63, 80-308, Gdansk, Poland.

Archives of Biochemistry and Biophysics
|August 9, 2021
PubMed

Insights

Nutrient overload causes insulin resistance in glomerular podocytes. This impairs glucose uptake by affecting pathways like NADPH oxidase, AMPK, and SIRT1, contributing to diabetic kidney disease.

Area of Science:

  • Nephrology
  • Cellular Biology
  • Metabolic Research

Background:

  • Glomerular podocytes are crucial for kidney filtration and respond to insulin.
  • Insulin resistance in podocytes disrupts glucose uptake, a key factor in diabetic nephropathy.
  • Nutrient overload is increasingly recognized as a driver of podocyte dysfunction.

Purpose of the Study:

  • To review the cellular and molecular mechanisms underlying insulin resistance in glomerular podocytes.
  • To highlight the impact of nutrient overload and diabetic environments on podocyte insulin signaling.
  • To consolidate current understanding of factors contributing to podocyte insulin resistance.

Main Methods:

  • Literature review of recent studies on podocyte insulin resistance.
  • Analysis of molecular pathways affected by high glucose and fatty acids.
  • Examination of signaling cascades including oxidative stress, AMPK, SIRT1, and calcium channels.

Main Results:

  • High glucose induces oxidative stress via NADPH oxidase, reduces AMPK phosphorylation, and decreases SIRT1 activity.
  • Calcium signaling through TRPC6 channels is implicated in regulating insulin sensitivity.
  • Elevated insulin and palmitic acid levels in a diabetic environment promote insulin receptor degradation and insulin resistance.

Conclusions:

  • Multiple cellular and molecular pathways contribute to insulin resistance in podocytes under conditions of nutrient overload and diabetes.
  • Understanding these mechanisms is vital for developing targeted therapies for diabetic kidney disease.
  • Podocyte insulin resistance represents a critical link between metabolic dysfunction and kidney damage.
Keywords:
Diabetic nephropathyFree fatty acidsHigh glucoseInsulin resistancePodocyte

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