Phenyl-α-tert-butyl-nitrone and Benzonidazole Treatment Controlled the Mitochondrial Oxidative Stress and Evolution of Cardiomyopathy in Chronic Chagasic Rats

Jian Jun Wen, Shivali Gupta, Zhangjun Guan, Monisha Dhiman, David Condon, Charles Lui, Nisha Jain Garg

Research output: Contribution to journalArticlepeer-review

67 Scopus citations


Objectives: The purpose of this study was to determine the pathological importance of oxidative stress-induced injurious processes in chagasic heart dysfunction. Background: Trypanosoma cruzi-induced inflammatory pathology and a feedback cycle of mitochondrial dysfunction and oxidative stress may contribute to Chagas disease. Methods: Sprague-Dawley rats were infected with T. cruzi and treated with phenyl-α-tert-butylnitrone (PBN), an antioxidant, and/or benzonidazole (BZ), an antiparasitic agent. We monitored myocardial parasite burden, oxidative adducts, mitochondrial complex activities, respiration, and adenosine triphosphate synthesis rates, and inflammatory and cardiac remodeling responses during disease development. The cardiac hemodynamics was determined for all rats. Results: Benzonidazole (not PBN) decreased the parasite persistence and immune adverse events (proinflammatory cytokine expression, β-nicotinamide adenine dinucleotide phosphate oxidase and myeloperoxidase activities, and inflammatory infiltrate) in chronically infected hearts. PBN ± BZ (not BZ alone) decreased the mitochondrial reactive oxygen species level, oxidative adducts (malonyldialdehyde, 4-hydroxynonenal, carbonyls), hypertrophic gene expression (atrial natriuretic peptide, B-type natriuretic peptide, α-skeletal actin), and collagen deposition and preserved the respiratory chain efficiency and energy status in chronically infected hearts. Subsequently, LV dysfunction was prevented in PBN ± BZ-treated chagasic rats. Conclusions: BZ treatment after the acute stage decreased the parasite persistence and inflammatory pathology. Yet, oxidative adducts, mitochondrial dysfunction, and remodeling responses persisted and contributed to declining cardiac function in chagasic rats. Combination treatment (PBN + BZ) was beneficial in arresting the T. cruzi-induced inflammatory and oxidative pathology and chronic heart failure in chagasic rats.

Original languageEnglish (US)
Pages (from-to)2499-2508
Number of pages10
JournalJournal of the American College of Cardiology
Issue number22
StatePublished - Jun 1 2010


  • Chagas disease
  • Trypanosoma cruzi
  • antioxidant
  • benzonidazole
  • mitochondrial oxidative stress

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine


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