Oxidative modification of mitochondrial respiratory complexes in response to the stress of Trypanosoma cruzi infection

Jian Jun Wen, Nisha Garg

Research output: Contribution to journalArticle

60 Citations (Scopus)

Abstract

Previously, we have shown deficiencies in the activities of the mitochondrial respiratory complexes and reduced mitochondrial ATP generation capacity in chagasic hearts infected by Trypanosoma cruzi. In this study, we determined whether the oxidative stress that occurs in response to T. cruzi infection contributes to the catalytic impairment of respiratory complexes and to subsequent mitochondrial dysfunction in murine myocardium. Our data show that oxidative injuries, as determined by the levels of lipid peroxides and protein carbonyls, are incurred in cardiac mitochondria as early as 3 days postinfection and persist throughout the infection and disease. The individual components of the respiratory complexes were separated by two-dimensional, blue-native gel electrophoresis, and carbonyl adducts were detected by Western blotting. We observed substantial carbonylation of the specific subunits of mitochondrial respiratory complexes in infected murine hearts. Of note is the oxidative modification of NDUFS1, NDUFS2, and NDUFV1, which form the catalytic core of the CI complex; UQCRC1, UQCRC2, and UQCRQ, the subunits of the core subcomplex, and UQCRH and CYC1, which form the cyt c 1 subcomplex of CIII; and a γ chain that is essential for ATP synthesis by CV complex. The extent of oxidative modifications of the subunits correlated with the catalytic defects of the respiratory complexes in the infected myocardium. Taken together, our data demonstrate that respiratory complexes are oxidatively damaged in response to the stress of T. cruzi infection. These data also suggest involvement of the specific susceptibility of the protein subunits, and not generalized mitochondrial oxidative damage in respiratory chain impairment of chagasic hearts.

Original languageEnglish (US)
Pages (from-to)2072-2081
Number of pages10
JournalFree Radical Biology and Medicine
Volume37
Issue number12
DOIs
StatePublished - Dec 15 2004

Fingerprint

Trypanosoma cruzi
Myocardium
Adenosine Triphosphate
Infection
Carbonylation
Mitochondria
Oxidative stress
Lipid Peroxides
Protein Subunits
Electron Transport
Electrophoresis
Catalytic Domain
Oxidative Stress
Western Blotting
Gels
Defects
Wounds and Injuries
Proteins

Keywords

  • Chagasic disease
  • Endogenous mitochondrial oxidative stress
  • Free radicals
  • Mitochondrial dysfunction
  • Protein carbonyls
  • Respiratory complexes
  • Trypanosoma cruzi

ASJC Scopus subject areas

  • Medicine(all)
  • Toxicology
  • Clinical Biochemistry

Cite this

Oxidative modification of mitochondrial respiratory complexes in response to the stress of Trypanosoma cruzi infection. / Wen, Jian Jun; Garg, Nisha.

In: Free Radical Biology and Medicine, Vol. 37, No. 12, 15.12.2004, p. 2072-2081.

Research output: Contribution to journalArticle

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