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Lipid peroxidation regulates podocyte migration and cytoskeletal structure through redox sensitive RhoA signaling

Claudia Kruger1, Susan J Burke2, J Jason Collier3

  • 1Oxidative Stress and Disease Laboratory, Pennington Biomedical Research Center, 6400 Perkins Rd, Baton Rouge, 70808 LA, USA.

Redox Biology
|March 17, 2018
PubMed

Insights

Lipid radicals, a form of oxidative stress, harm kidney podocytes by disrupting their structure and function. This damage, mediated by RhoA signaling, contributes to chronic kidney disease progression in diabetes and obesity.

Area of Science:

  • Nephrology
  • Oxidative Stress Biology
  • Cellular Physiology

Background:

  • Podocyte loss is a hallmark of chronic kidney diseases (CKD) associated with obesity and diabetes.
  • Current treatments for hyperglycemia and hypertension do not prevent podocyte depletion, indicating other contributing factors.
  • Oxidative stress is implicated in CKD, but the specific mechanisms by which free radicals impact podocyte physiology remain unclear.

Purpose of the Study:

  • To investigate the effects of lipid radicals, a major product of lipid peroxidation and oxidative stress in diabetes, on podocyte function.
  • To elucidate the signaling pathways through which lipid radicals influence podocyte homeostasis.

Main Methods:

  • Investigated the impact of lipid radicals on podocyte migration and F-actin fiber integrity.
  • Utilized genetic manipulation by mutating redox-sensitive cysteines in RhoA to assess their role in mediating lipid radical effects.

Main Results:

  • Lipid radicals were found to inhibit podocyte migration and induce the loss of F-actin fibers.
  • These detrimental effects on podocyte homeostasis were mitigated by mutating the redox-sensitive cysteines of RhoA, implicating this signaling pathway.
  • Lipid peroxidation-derived radicals directly impact podocyte function via redox-sensitive RhoA signaling.

Conclusions:

  • Lipid radicals play a significant role in podocyte dysfunction in the context of increased lipid peroxidation.
  • The findings suggest that lipid radicals, through RhoA signaling, can lead to pathogenic consequences for kidney physiology in diseases like diabetes and obesity.
  • Targeting lipid peroxidation or its downstream signaling may offer novel therapeutic strategies for preventing podocyte loss in CKD.
Keywords:
Chronic kidney diseaseCysteineLipid peroxidationPodocyteReactive lipidsRhoA

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