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Renal Glomerular Mitochondria Function in Salt-Sensitive Hypertension.

Mark Domondon1, Iuliia Polina1, Anna B Nikiforova1,2

  • 1Department of Medicine, Division of Nephrology, Medical University of South Carolina, Charleston, SC, United States.

Frontiers in Physiology
|March 3, 2020
PubMed
Summary

Salt-sensitive hypertension damages kidney glomeruli through impaired mitochondria function. This study in Dahl SS rats reveals defective glomerular mitochondria, leading to podocyte loss and proteinuria, suggesting a new therapeutic target.

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Area of Science:

  • Nephrology
  • Mitochondrial Biology
  • Cardiovascular Research

Background:

  • Salt-sensitive hypertension is linked to early proteinuria and podocyte loss.
  • Mitochondrial dysfunction is a potential contributor to glomerular damage in hypertension.

Purpose of the Study:

  • To investigate the role of mitochondrial dysfunction in glomerular damage in salt-sensitive hypertension.
  • To test the hypothesis that impaired glomerular mitochondria contribute to SS hypertension-induced kidney damage.

Main Methods:

  • Utilized Dahl SS rats fed normal salt (NS) or high salt (HS) diets for 21 days.
  • Assessed mitochondrial function using Seahorse assays on isolated glomeruli.
  • Examined mitochondrial structure and reactive oxygen species production via TEM and confocal imaging.

Main Results:

  • High salt diet induced hypertension, renal hypertrophy, glomerulosclerosis, and fibrosis.
  • Mitochondrial respiration (basal, maximal, spare capacity) was significantly reduced in HS group glomeruli.
  • Glomerular mitochondria from HS rats showed structural abnormalities and heightened H2O2 response.

Conclusions:

  • Glomerular mitochondria are functionally and structurally impaired in salt-sensitive hypertension.
  • Mitochondrial defects in glomeruli may drive podocyte loss and proteinuria.
  • Targeting the glomerular-mitochondria axis offers a potential therapeutic strategy for hypertensive glomerulosclerosis.