Chronic Co-Administration of Sepiapterin and l-Citrulline Ameliorates Diabetic Cardiomyopathy and Myocardial Ischemia/Reperfusion Injury in Obese Type 2 Diabetic Mice

Shelley L. Baumgardt, Mark Paterson, Thorsten M. Leucker, Juan Fang, David X. Zhang, Zeljko J. Bosnjak, David C. Warltier, Judy R. Kersten, Zhi Dong Ge*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

Diabetic heart disease is associated with tetrahydrobiopterin oxidation and high arginase activity, leading to endothelial nitric oxide synthase dysfunction. Sepiapterin (SEP) is a tetrahydrobiopterin precursor, and l-citrulline (l-Cit) is converted to endothelial nitric oxide synthase substrate, l-arginine. Whether SEP and l-Cit are effective at reducing diabetic heart disease is not known. The present study examined the effects of SEP and l-Cit on diabetic cardiomyopathy and ischemia/reperfusion injury in obese type 2 diabetic mice. Methods and Results-Db/db and C57BLKS/J mice at 6 to 8 weeks of age received vehicle, SEP, or l-Cit orally alone or in combination for 8 weeks. Cardiac function was evaluated with echocardiography. Db/db mice displayed hyperglycemia, obesity, and normal blood pressure and cardiac function compared with C57BLKS/J mice at 6 to 8 weeks of age. After vehicle treatment for 8 weeks, db/db mice had reduced ejection fraction, mitral E/A ratio, endothelium-dependent relaxation of coronary arteries, tetrahydrobiopterin concentrations, ratio of endothelial nitric oxide synthase dimers/monomers, and nitric oxide levels compared with vehicle-treated C57BLKS/J mice. These detrimental effects of diabetes mellitus were abrogated by co-administration of SEP and l-Cit. Myocardial infarct size was increased, and coronary flow rate and ±dP/dt were decreased during reperfusion in vehicle-treated db/db mice subjected to ischemia/reperfusion injury compared with control mice. Co-administration of SEP and l-Cit decreased infarct size and improved coronary flow rate and cardiac function in both C57BLKS/J and db/db mice. Conclusions-Co-administration of SEP and l-Cit limits diabetic cardiomyopathy and ischemia/reperfusion injury in db/db mice through a tetrahydrobiopterin/endothelial nitric oxide synthase/nitric oxide pathway.

Original languageEnglish (US)
JournalCirculation: Heart Failure
Volume9
Issue number1
DOIs
StatePublished - Jan 1 2016

Keywords

  • Diabetic cardiomyopathy
  • ischemia reperfusion injury
  • nitric oxide synthase
  • tetrahydrobiopterin
  • type 2 diabetes mellitus

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine

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