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MitoTEMPO Prevents Oxalate Induced Injury in NRK-52E Cells via Inhibiting Mitochondrial Dysfunction and Modulating

Jiaqiao Zhang1, Qing Wang1, Chuou Xu2

  • 1Department and Institute of Urology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China.

Oxidative Medicine and Cellular Longevity
|January 25, 2017
PubMed

Insights

MitoTEMPO, a mitochondria-targeted antioxidant, protects kidney cells from oxalate-induced injury by reducing oxidative stress and improving mitochondrial function. This suggests MitoTEMPO as a potential therapeutic for hyperoxaluria and kidney stones.

Area of Science:

  • Nephrology
  • Biochemistry
  • Cell Biology

Background:

  • Hyperoxaluria is a major risk factor for kidney stones (urolithiasis).
  • Oxalate-induced kidney injury involves oxidative stress and mitochondrial dysfunction.
  • MitoTEMPO is a mitochondria-targeted antioxidant with potential protective effects.

Purpose of the Study:

  • To investigate the protective effects of MitoTEMPO against oxalate-mediated injury in renal epithelial cells (NRK-52E).
  • To determine if MitoTEMPO inhibits mitochondrial dysfunction and modulates oxidative stress induced by oxalate.

Main Methods:

  • MitoSOX Red assay for mitochondrial reactive oxygen species (mtROS).
  • Measurement of mitochondrial membrane potential (Δψm) and ATP synthesis.
  • Western blot analysis for NADPH oxidase components (Nox4, Nox2, p22) and inflammatory markers (IL-6, OPN).

Main Results:

  • MitoTEMPO pretreatment reduced lactate dehydrogenase (LDH) and malondialdehyde (MDA) release.
  • MitoTEMPO significantly decreased oxalate-induced mtROS generation.
  • MitoTEMPO restored mitochondrial membrane potential and ATP synthesis disrupted by oxalate.
  • MitoTEMPO modulated Nox4 and p22 expression and reduced IL-6 and osteopontin (OPN) levels.

Conclusions:

  • MitoTEMPO protects renal cells against oxalate-induced injury.
  • The protective mechanism involves inhibiting mitochondrial dysfunction and oxidative stress.
  • MitoTEMPO shows promise as a therapeutic agent for oxalate-induced kidney injury and urolithiasis.

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