What does this research mean for the field?

Exogenous tetrahydrobiopterin (BH4) supplementation attenuates left ventricular remodeling and preserves cardiac function after myocardial infarction by preventing eNOS uncoupling and reducing superoxide generation. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To investigate the role of oxidative stress generated by uncoupled endothelial nitric oxide synthase in left ventricular remodeling after myocardial infarction and assess the impact of tetrahydrobiopterin supplementation.

January 1, 2008Circulation JournalOpen Access

Beneficial Effects of Exogenous Tetrahydrobiopterin on Left Ventricular Remodeling After Myocardial Infarction in Rats The Possible Role of Oxidative Stress Caused by Uncoupled Endothelial Nitric Oxide Synthase

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Why the study?

Does oral tetrahydrobiopterin (BH4) supplementation improve left ventricular remodeling and cardiac function in a rat model of myocardial infarction?

Population

Male Sprague-Dawley rats subjected to left anterior descending coronary artery ligation to produce…

Comparison

Oral tetrahydrobiopterin supplementation… vs Normal chow-treated MI rats, sham-operated rats…

Design

Preclinical

Follow-up

4 weeks

Authors

TMTomoya MasanoKobe Medical Center SKSeinosuke KawashimaASKA Pharmaceutical (Japan)RTRyuji TohKobe University

Discussion

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Implication

Hypothesis-generating for BH4 in post-MI remodeling; clinical trials needed before human translation.

Key Points

To investigate the role of oxidative stress generated by uncoupled endothelial nitric oxide synthase in left ventricular remodeling after myocardial infarction and assess the impact of tetrahydrobiopterin supplementation.
Administered oral tetrahydrobiopterin (BH4) supplementation to rats starting 3 days before coronary artery ligation.
Assessed cardiac superoxide levels, BH4/dihydrobiopterin (BH2) ratios, eNOS dimer/monomer ratios, ventricular dimensions, and cardiac function at 4 weeks post-myocardial infarction.
Untreated post-infarction hearts exhibited increased superoxide generation alongside decreased BH4/BH2 and eNOS dimer/monomer ratios at 4 weeks.
BH4 treatment preserved the BH4/BH2 and eNOS dimer/monomer ratios and suppressed myocardial superoxide production.
BH4-treated rats demonstrated smaller left ventricular dimensions, reduced non-infarcted wall thickness, and preserved cardiac function compared to untreated post-infarction controls.

Structured PICO

Does oral tetrahydrobiopterin (BH4) supplementation improve left ventricular remodeling and cardiac function in a rat model of myocardial infarction?

Population

Male Sprague-Dawley rats (8 weeks of age) subjected to left anterior descending coronary artery (LAD) ligation to produce myocardial infarction.

Intervention

Oral tetrahydrobiopterin (BH4) supplementation (10 mg/kg/day) starting 3 days before coronary artery ligation and continuing for 4 weeks.

Comparator

Normal chow-treated MI rats (control MI rats), sham-operated rats, and tetrahydroneopterin (H4N, 10 mg/kg/day)-treated MI rats.

Outcome

Left ventricular remodeling and cardiac function (assessed by echocardiography and hemodynamics) and superoxide production at 4 weeks after MI.surrogate

Exogenous BH4 supplementation attenuates left ventricular remodeling and preserves cardiac function after myocardial infarction in rats by preventing eNOS uncoupling and reducing oxidative stress.

Limitations

Could not identify the localization of uncoupled eNOS in the heart
Unclear whether eNOS in myocytes also suffers from uncoupling
Role of upregulated iNOS or nNOS after MI was not fully addressed

Cite This Study

Masano et al. (2008) studied this question.

synapsesocial.com/papers/6a1a2cc4db849bfdc47fc9b8 https://doi.org/10.1253/circj.cj-08-0072

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Beneficial Effects of Exogenous Tetrahydrobiopterin on Left Ventricular Remodeling After Myocardial Infarction in Rats The Possible Role of Oxidative Stress Caused by Uncoupled Endothelial Nitric Oxide Synthase

Discussion

Member takes

Implication

Key Points

Structured PICO

Limitations

Cite This Study

Beneficial Effects of Exogenous Tetrahydrobiopterin on Left Ventricular Remodeling After Myocardial Infarction in Rats The Possible Role of Oxidative Stress Caused by Uncoupled Endothelial Nitric Oxide Synthase

Discussion

Member takes

Implication

Key Points

Structured PICO

Limitations

Cite This Study

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