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A role for the aryl hydrocarbon receptor in cardiac physiology and function as demonstrated by AhR knockout mice

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Abstract

The aryl hydrocarbon receptor (AhR), a ligand activated transcription factor, is the receptor for the polycyclic aromatic hydrocarbons found in tobacco smoke, polychlorinated biphenyls, and the environmental pollutant, dioxin. To better understand the role of the AhR in the heart, echocardiography, invasive measurements of aortic and left ventricular pressures, isolated working heart preparations, as well as morphological and molecular analysis were used to investigate the impact of AhR inactivation on the mouse heart using the AhR knockout as a model. Cardiac hypertrophy is an early phenotypic manifestation of the AhR knockout. Although the knockout animals were not hypertensive at the ages examined, cardiomyopathy accompanied by diminished cardiac output developed. Despite the structural left ventricular remodeling, the hearts of these animals exhibit minimal fibrosis and do not have the expected increases in surrogate molecular markers of cardiac hypertrophy. The anatomic remodeling without typical features of molecular remodeling is not consistent with hypertrophic growth secondary to pressure or volume overload, suggesting that increased cardiomyocyte size may be a direct consequence of the absence of the AhR in this cell type.

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Authors and Affiliations

  1. Department of Pharmacology, SUNY Upstate Medical University, 13210, Syracuse, NY

    Alejandro Vasquez, Xiaomang You, Sharon E. Chase & Karen L. Vikstrom PhD

  2. Department of Pediatrics, SUNY Upstate Medical University, 13210, Syracuse, NY

    Nader Atallah-Yunes & Frank C. Smith

  3. Departments of Microbiology and Immunology, SUNY Upstate Medical University, 13210, Syracuse, NY

    Allen E. Silverstone

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  1. Alejandro Vasquez
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  2. Nader Atallah-Yunes
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  3. Frank C. Smith
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  4. Xiaomang You
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  5. Sharon E. Chase
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Correspondence to Karen L. Vikstrom PhD.

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Vasquez, A., Atallah-Yunes, N., Smith, F.C. et al. A role for the aryl hydrocarbon receptor in cardiac physiology and function as demonstrated by AhR knockout mice. Cardiovasc Toxicol 3, 153–163 (2003). https://doi.org/10.1385/CT:3:2:153

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  • DOI: https://doi.org/10.1385/CT:3:2:153

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