What is the clinical evidence from this study?

Study design: Other. Population: Myocardial infarction. Intervention: Constitutive overexpression of HIF-1alpha vs. Control animals. Primary outcome: Infarct size and cardiac function.

What question did this study set out to answer?

To determine whether constitutive cardiac expression of hypoxia-inducible factor 1-alpha (HIF-1alpha) reduces infarct size and preserves cardiac performance following myocardial infarction.

August 26, 2026Journal of the American College of Cardiology330 citationsOpen Access

Hypoxia-Inducible Factor 1-Alpha Reduces Infarction and Attenuates Progression of Cardiac Dysfunction After Myocardial Infarction in the Mouse

MKMasakuni Kido LDLingling Du CSChristopher C. Sullivan

Key Result

Constitutive overexpression of HIF-1alpha in the murine heart attenuated infarct size and improved cardiac function 4 weeks after myocardial infarction.

Key Points

To determine whether constitutive cardiac expression of hypoxia-inducible factor 1-alpha (HIF-1alpha) reduces infarct size and preserves cardiac performance following myocardial infarction.
Generated transgenic mice constitutively expressing HIF-1alpha under the control of the cardiac-specific alpha-myosin heavy chain promoter alongside non-transgenic control animals.
Induced myocardial infarction via surgical coronary artery ligation and evaluated heart structure and function via serial 2D and M-mode echocardiography over 4 weeks.
Quantified capillary density alongside VEGF and iNOS expression across infarct, peri-infarct, and remote myocardial tissue using molecular and histological analyses.
Constitutive HIF-1alpha overexpression significantly attenuated infarct size and preserved left ventricular systolic performance at 4 weeks post-infarction compared to controls.
Hearts of HIF-1alpha transgenic mice exhibited marked increases in vascular endothelial growth factor (VEGF) and inducible nitric oxide synthase (iNOS) in infarct and peri-infarct regions.
Capillary density in the ischemic border zone was significantly enhanced in transgenic animals, supporting border zone tissue survival and favorable structural remodeling.

Structured PICO

Does constitutive overexpression of HIF-1alpha reduce infarct size and improve cardiac function in a mouse model of myocardial infarction?

Population

Transgenic mice with constitutive HIF-1alpha expression and control animals subjected to myocardial infarction by coronary ligation and followed for 4 weeks.

Intervention

Constitutive overexpression of hypoxia-inducible factor 1-alpha (HIF-1alpha) under the control of the alpha-myosin heavy chain promoter

Comparator

Control animals with myocardial infarction

Outcome

Infarct size and cardiac functionsurrogate

Constitutive overexpression of HIF-1alpha protects against extension of infarction and improves border zone survival in a mouse model of myocardial infarction.

Abstract

OBJECTIVES: The aim of this research was to test whether constitutive expression of hypoxia-inducible factor 1-alpha (HIF-1alpha) influences infarction size and cardiac performance after myocardial infarction. BACKGROUND: A major question in clinical medicine is whether infarction size and border zone remodeling of the heart can be influenced by the overexpression of specific genes in the peri-infarction region. METHODS: We investigated the role of constitutive HIF-1alpha expression in acute myocardial infarction using a transgenic model. Transgenic mice containing the HIF-1alpha gene under the control of the alpha-myosin heavy chain promoter were constructed. Myocardial infarction was produced by coronary ligation in HIF-1alpha transgenic mice and control animals. Extent of infarction was then quantitated by two-dimensional and M-mode echocardiography as well as by molecular and pathologic analysis of heart samples in infarct, peri-infarct, and remote heart regions at serial time points. RESULTS: Constitutive overexpression of HIF-1alpha in the murine heart resulted in attenuated infarct size and improved cardiac function 4 weeks after myocardial infarction. Significantly, we found an increase in both capillary density as well as vascular endothelial growth factor and inducible nitric oxide synthase expression in peri-infarct and infarct regions in the hearts of constitutive HIF-1alpha-expressing animals compared to control animals. CONCLUSIONS: These observations suggest the involvement of HIF-1alpha in myocardial remodeling and peri-infarct vascularization. Our results show that supranormal amounts of this peptide protect against extension of infarction and improve border zone survival in myocardial infarction.

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