Abstract
Although numerous advancements made in the field of human health have resulted in reduced deaths due to cardiovascular diseases (CVD), many patients with cardiac disease show no established risk. Therefore, other unknown factors may be responsible for the pathophysiology of CVD. Out of 350,000 sudden cardiac deaths each year in the United States, 60,000 deaths have been related to air pollution, suggesting a detrimental role of environmental pollutants in the development of CVD. The present study tested our hypothesis that chronic ozone exposure enhances the sensitivity to ischemia–reperfusion (I/R) injury in isolated perfused hearts. Sprague-Dawley rats were continuously exposed for 8 h/day for 28 and 56 days to filtered air or 0.8 ppm ozone. Isolated hearts were subjected to 30 min of global ischemia followed by 60 min of reperfusion. Cardiac function after I/R measured as left ventricular developed pressure (LVDP), +dP/dt, –dP/dt, and left ventricular end diastolic pressure (LVEDP) was significantly decreased and increased respectively in ozone-exposed I/R hearts compared to I/R hearts exposed to filtered air. The enhanced sensitivity to I/R injury upon ozone exposure was associated with increased myocardial TNF-α levels and lipid peroxidation and decreased myocardial activities of superoxidase dismutase (SOD) and IL-10. These data suggest that ozone-induced sensitivity to myocardial I/R injury may be due to promoting levels of oxidative stress as well as inflammatory mediators.
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Acknowledgments
This work was supported by grants from Texas A&M Health Science Center (TAMHSC), Texas A&M University Kingsville (TAMUK) and US Environmental Protection Agency. We thank Dr. Kuruvilla John and Mr. Don Marek from the Department of Environmental Engineering at TAMUK for their technical support and advice. We are also grateful to TAMUK-Ronald McNair Scholars—Miss Patricia Hinojosa and Mr. Daniel Diaz, TAMHSC-Pharm D student—Ms. BaAimee Nguyen and the King High School-AP Biology Student—Mr. Vishal Sethi for laboratory assistance.
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Perepu, R.S.P., Garcia, C., Dostal, D. et al. Enhanced death signaling in ozone-exposed ischemic-reperfused hearts. Mol Cell Biochem 336, 55–64 (2010). https://doi.org/10.1007/s11010-009-0265-4
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DOI: https://doi.org/10.1007/s11010-009-0265-4