Borderzone contractile dysfunction is transiently attenuated and left ventricular structural remodeling is markedly reduced following reperfused myocardial infarction in inducible nitric oxide synthase knockout mice.

Borderzone contractile dysfunction is transiently attenuated and left ventricular structural remodeling is markedly reduced following reperfused myocardial infarction in inducible nitric oxide synthase knockout mice. Research Abstract Details 

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Borderzone contractile dysfunction is transiently attenuated and left ventricular structural remodeling is markedly reduced following reperfused myocardial infarction in inducible nitric oxide synthase knockout mice. Abstract Text:

Wesley D Gilson,Frederick H Epstein,Zequan Yang,Yaqin Xu,Konkal-Matt R Prasad,Marie-Claire Toufektsian,Victor E Laubach,Brent A French,

OBJECTIVES: We sought to determine the effect of inducible nitric oxide synthase (iNOS) expression on regional contractile function and left ventricular (LV) remodeling after reperfused myocardial infarction (MI). BACKGROUND: Inducible nitric oxide synthase is known to contribute to global LV dysfunction after a large MI, but the mechanisms underlying this dysfunction remain unclear. METHODS: We used immunohistochemistry to investigate the distribution of iNOS expression in wild-type (WT) and iNOS knockout (KO) mice early (day 1) and late (day 28) after reperfused MI. We also used serial cardiac magnetic resonance imaging at baseline and at 1, 7, and 28 days after MI to assess LV volumes, ejection fraction (EF), regional circumferential strain (E(cc)), and day 1 infarct size. RESULTS: At baseline, LV volumes and EF were similar between groups. Day 1 infarct size was also similar between groups. Immunohistochemistry revealed that iNOS expression was abundant throughout the heart in WT mice on day 1 after MI, particularly near the infarct borderzone. On day 7 after MI, E(cc) in KO mice was significantly improved in some borderzone sectors compared with WT. The LV volumes were significantly lower in KO mice at days 7 and 28 compared with WT. The EF on days 7 and 28 was significantly higher in KO mice compared with WT. The circumferential extent of wall thinning was also significantly reduced in KO versus WT mice at days 7 and 28. CONCLUSIONS: Expression of iNOS contributes importantly to post-infarction contractile dysfunction and subsequent LV remodeling, suggesting new strategies to combat heart failure resulting from large MI.

Borderzone contractile dysfunction is transiently attenuated and left ventricular structural remodeling is markedly reduced following reperfused myocardial infarction in inducible nitric oxide synthase knockout mice. Publishing Authors By Initials

WD Gilson,FH Epstein,Z Yang,Y Xu,KM Prasad,MC Toufektsian,VE Laubach,BA French,

For similar circulatory and respiratory physiology: cardiovascular physiology: cardiovascular physiologic processes: ventricular function: ventricular remodeling research abstracts see: circulatory and respiratory physiology: cardiovascular physiology: cardiovascular physiologic processes: ventricular function: ventricular remodeling research

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Borderzone contractile dysfunction is transiently attenuated and left ventricular structural remodeling is markedly reduced following reperfused myocardial infarction in inducible nitric oxide synthase knockout mice. Journal Published:

PUBLICATION TYPE: Research Support, N.I.H., Extr

Journal: Journal of the American College of Cardiology

VOLUME: 50

Page Numbers: 1799-807

Journal Abbreviation: J. Am. Coll. Cardiol.

ISSN: 1558-3597

DAY: 30

MONTH: Oct

YEAR: 2007

Borderzone contractile dysfunction is transiently attenuated and left ventricular structural remodeling is markedly reduced following reperfused myocardial infarction in inducible nitric oxide synthase knockout mice. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 8301365

Borderzone contractile dysfunction is transiently attenuated and left ventricular structural remodeling is markedly reduced following reperfused myocardial infarction in inducible nitric oxide synthase knockout mice. Keywords Mesh Terms:

KEYWORDS: Ventricular Remodeling

MESH TERMS: physiology

Chemical & Substance for Abstract: Borderzone contractile dysfunction is transiently attenuated and left ventricular structural remodeling is markedly reduced following reperfused myocardial infarction in inducible nitric oxide synthase knockout mice. Information

Substance Name: Nitric Oxide Synthase Type II

Registry Number: EC 1.14.13.39

Grant and Affiliation Information for Borderzone contractile dysfunction is transiently attenuated and left ventricular structural remodeling is markedly reduced following reperfused myocardial infarction in inducible nitric oxide synthase knockout mice.

AFFILIATION: Department of Biomedical Engineering, University of Virginia, Charlottesville, Virginia 22903, USA.

Country: United States

AGENCY: United States NHLBI

GRANT: R01-HL69494

ACRONYM: HL

MEDLINETA: J Am Coll Cardiol

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