Oxidative stress and myocardial remodeling in chronic mitral regurgitation

James D. Gladden, Mustafa I Ahmed, Silvio H. Litovsky, Chun G. Schiros, Steven G. Lloyd, Himanshu Gupta, Thomas S. Denney, Victor Darley-Usmar, David C. McGiffin, Louis J. Dell'Italia

Research output: Contribution to journalArticleResearchpeer-review

14 Citations (Scopus)

Abstract

Mechanisms of left ventricular (LV) dysfunction in isolated mitral regurgitation (MR) are not well understood. Vasodilator therapy in other forms of LV dysfunction reduces LV wall stress and improves LV function; however, studies in isolated MR show no beneficial effect on LV remodeling using vasodilator drugs or renin-angiotensin system blockade. Therefore, the search for new therapies that improve LV remodeling and function in isolated MR is clinically significant. Recent work in the authors' laboratory has demonstrated increased oxidants from a number of sources including the enzyme xanthine oxidase (XO) in the LV of patients with isolated MR. In addition to being a major source of reactive oxygen species, XO is linked to bioenergetic dysfunction because its substrates derive from adenosine triphosphate catabolism. Correspondingly, there was also evidence of aggregates of small mitochondria in cardiomyocytes, which is generally considered a response to bioenergetic deficit in cells. Future studies are required to determine whether XO and persistent oxidative stress are causative in maladaptive LV remodeling and offer potential therapeutic targets in ameliorating LV damage in patients with isolated MR.

Original languageEnglish
Pages (from-to)114-119
Number of pages6
JournalThe American Journal of the Medical Sciences
Volume342
Issue number2
DOIs
Publication statusPublished - Aug 2011
Externally publishedYes

Keywords

  • Left ventricular function
  • Mitral regurgitation
  • Oxidative stress
  • Xanthine oxidase

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