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Area of Science:

  • Cardiovascular Science
  • Mitochondrial Biology
  • Oxidative Stress Research

Background:

  • Mitochondrial damage is a key factor in cardiac disease progression.
  • Proinflammatory cytokines, like tumor necrosis factor (TNF), induce oxidative stress, contributing to cardiac dysfunction.
  • The specific role of TNF-induced superoxide in damaging left ventricular (LV) mitochondria requires further elucidation.

Purpose of the Study:

  • To investigate if TNF-induced superoxide (O(2)(*)(-)) impairs mitochondrial respiratory complex I activity in the left ventricle (LV).
  • To assess the impact of TNF on mitochondrial ROS production, ATP synthesis, and oxygen consumption in cardiac tissue.

Main Methods:

  • Utilized electron paramagnetic resonance (EPR) with an oxygen label to measure O(2)(*)(-), oxygen consumption, and ROS production in isolated rat LV mitochondria.
  • Administered TNF, apocynin (an NADPH oxidase inhibitor), and Tempol (an antioxidant) to adult male Sprague-Dawley rats.
  • Analyzed LV tissue and isolated mitochondria for oxidative stress markers and mitochondrial function.

Main Results:

  • TNF treatment significantly increased total LV ROS production compared to controls.
  • Apocynin and Tempol treatments attenuated TNF-induced LV ROS production.
  • Mitochondrial ROS production was significantly elevated in TNF and TNF+Apocynin groups, but not in the TNF+Tempol group, compared to controls.
  • TNF led to reduced expression of complex I subunits, depleted ATP synthesis, and decreased oxygen consumption.

Conclusions:

  • TNF alters the cellular redox state, increasing mitochondrial superoxide production.
  • This increased mitochondrial superoxide production leads to impaired respiratory complex I activity, reduced ATP synthesis, and decreased oxygen consumption.
  • These effects result in mitochondrial damage and subsequent left ventricular (LV) dysfunction.