Aggravation of Myocardial Ischemia upon Particulate Matter Exposure in Atherosclerosis Animal Model.

The health problems caused by air pollution (especially particulate pollution) are getting more and more attention, especially among cardiovascular disease patients, which aggravates complicated disorders and causes poor prognosis. The simple myocardial ischemia (MI) or particulate matter (PM) exposure model is unsuitable for such studies of diseases with multiple causes. Here, a method for constructing a composite model combining PM exposure, atherosclerosis, and myocardial ischemia has been described. ApoE-/- mice were fed with a high-fat diet for 16 weeks to develop atherosclerosis, tracheal instillation of PM standard suspension was performed to simulate the pulmonary exposure of PM, and the left anterior descending coronary artery was ligated one week after the last exposure. Tracheal instillation of PM can simulate acute lung exposure while significantly reducing the cost of the experiment; the classic left anterior descending artery ligation with noninvasive tracheal intubation and a new auxiliary expansion device can ensure the animal's survival rate and reduce the difficulty of the operation. This animal model can reasonably simulate the patient's pathological changes of myocardial infarction aggravated by air pollution and provide a reference for the construction of animal models related to studies involving diseases with multiple causes.