Atrial natriuretic peptide increases inflammation, infarct size, and mortality after experimental coronary occlusion

Aiilyan K. Houng, Rachel A. McNamee, Attila Kerner, Pallavi Sharma, Almois Mohamad, Jonathan Tronolone, Guy Reed

Research output: Contribution to journalArticle

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Abstract

Acute coronary artery occlusion triggers the release of atrial natriuretic peptide (ANP) from the heart. ANP affects vasodilation, natriuresis, and inflammation, but the integrated biological effects of ANP on myocardial infarction are unknown. To elucidate these effects, the left anterior coronary artery was ligated in anesthetized, ANP-deficient (ANP -/-) and congenic wild-type (ANP +/+) mice. The survival of ANP -/- mice was markedly better (56%) at 30 days postinfarction than the survival of ANP +/+ mice (20%, P < 0.01). Surviving mice were comparable initially, but ANP -/- mice developed more cardiac hypertrophy (P < 0.001) and had lower contractility indexes 30 days after infarction (P < 0.05). An analysis 24 h after coronary occlusion showed that ANP -/- mice had smaller infarcts than ANP +/+ mice (62.6 ±; 12.1 vs. 100.8 ±; 3.8%, P < 0.001) adjusted for comparable areas at risk for ischemia. The administration of ANP to ANP -/- mice via osmotic minipumps significantly enlarged infarct size to levels comparable with those observed in ANP +/+ mice (P < 0.05). There was no difference in neutrophil migration into the noninfarcted myocardium of ANP -/- mice undergoing actual versus sham-operated coronary occlusion. By comparison, after coronary occlusion, the neutrophil infiltration into the myocardium was enhanced in ANP +/+ (P < 0.0005) and ANP -/- mice administered ANP (P < 0.0005). The expression of P-selectin, a molecule that mediates neutrophil adhesion, was significantly greater after coronary occlusion in the vasculature of ANP +/+ or ANP -/- mice treated with ANP than in ANP -/- mice (P < 0.002). Taken together, these results indicate that ANP increases P-selectin, neutrophil infiltration, infarct size, and mortality following experimental coronary occlusion.

Original languageEnglish (US)
JournalAmerican Journal of Physiology - Heart and Circulatory Physiology
Volume296
Issue number3
DOIs
StatePublished - Mar 1 2009

Fingerprint

Coronary Occlusion
Atrial Natriuretic Factor
Inflammation
Mortality
P-Selectin
Neutrophil Infiltration
Coronary Vessels
Myocardium
Neutrophils

All Science Journal Classification (ASJC) codes

  • Physiology
  • Physiology (medical)
  • Cardiology and Cardiovascular Medicine

Cite this

Atrial natriuretic peptide increases inflammation, infarct size, and mortality after experimental coronary occlusion. / Houng, Aiilyan K.; McNamee, Rachel A.; Kerner, Attila; Sharma, Pallavi; Mohamad, Almois; Tronolone, Jonathan; Reed, Guy.

In: American Journal of Physiology - Heart and Circulatory Physiology, Vol. 296, No. 3, 01.03.2009.

Research output: Contribution to journalArticle

Houng, Aiilyan K. ; McNamee, Rachel A. ; Kerner, Attila ; Sharma, Pallavi ; Mohamad, Almois ; Tronolone, Jonathan ; Reed, Guy. / Atrial natriuretic peptide increases inflammation, infarct size, and mortality after experimental coronary occlusion. In: American Journal of Physiology - Heart and Circulatory Physiology. 2009 ; Vol. 296, No. 3.
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abstract = "Acute coronary artery occlusion triggers the release of atrial natriuretic peptide (ANP) from the heart. ANP affects vasodilation, natriuresis, and inflammation, but the integrated biological effects of ANP on myocardial infarction are unknown. To elucidate these effects, the left anterior coronary artery was ligated in anesthetized, ANP-deficient (ANP -/-) and congenic wild-type (ANP +/+) mice. The survival of ANP -/- mice was markedly better (56{\%}) at 30 days postinfarction than the survival of ANP +/+ mice (20{\%}, P < 0.01). Surviving mice were comparable initially, but ANP -/- mice developed more cardiac hypertrophy (P < 0.001) and had lower contractility indexes 30 days after infarction (P < 0.05). An analysis 24 h after coronary occlusion showed that ANP -/- mice had smaller infarcts than ANP +/+ mice (62.6 ±; 12.1 vs. 100.8 ±; 3.8{\%}, P < 0.001) adjusted for comparable areas at risk for ischemia. The administration of ANP to ANP -/- mice via osmotic minipumps significantly enlarged infarct size to levels comparable with those observed in ANP +/+ mice (P < 0.05). There was no difference in neutrophil migration into the noninfarcted myocardium of ANP -/- mice undergoing actual versus sham-operated coronary occlusion. By comparison, after coronary occlusion, the neutrophil infiltration into the myocardium was enhanced in ANP +/+ (P < 0.0005) and ANP -/- mice administered ANP (P < 0.0005). The expression of P-selectin, a molecule that mediates neutrophil adhesion, was significantly greater after coronary occlusion in the vasculature of ANP +/+ or ANP -/- mice treated with ANP than in ANP -/- mice (P < 0.002). Taken together, these results indicate that ANP increases P-selectin, neutrophil infiltration, infarct size, and mortality following experimental coronary occlusion.",
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