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Establishment and characterization of an experimental model of coronary thrombotic microembolism in rats
1Department of Cardiology, Puai Hospital, Huazhong University of Science and Technology, Wuhan, Hubei Province, China. yegu2003cn@163.com
Abstract:
To establish a model of coronary thrombotic microembolism in rats, either automicrothrombotic particulates (CM group) or saline control (SHAM group) was injected into temporarily clamped aortas of male Sprague-Dawley rats. After automicrothrombotic particulate injection, serum c-troponin I and von Willebrand factor levels, the no-flow area as evaluated by Thioflavin S, myocardial leukocyte infiltration levels, myocardial expressions of tumor necrosis factor alpha and interleukin-6, the percentage of arterioles obstructed by thrombosis, and myocardial fibrosis were all significantly increased whereas cardiac function as evaluated by echocardiography and hemodynamic measurements were significantly reduced compared with the sham group. Thus, aortic automicrothrombotic particulate injection could induce coronary microembolism in rats, and this model could be of value in improving the understanding of pathophysiology of coronary microembolism.
Insights
Researchers developed a rat model for coronary microembolism using automicrothrombotic particulates. This model effectively simulates microembolic events, aiding the study of coronary microembolism pathophysiology.
Area of Science:
- Cardiovascular Research
- Experimental Pathology
- Animal Models
Background:
- Coronary microembolism is a significant cause of myocardial ischemia.
- Existing models may not fully recapitulate the complexity of thrombotic microembolic events.
- Understanding the pathophysiology is crucial for developing effective treatments.
Purpose of the Study:
- To establish and validate a novel rat model of coronary thrombotic microembolism.
- To investigate the pathological and functional consequences of induced coronary microembolism.
- To provide a tool for future research into microembolic disease.
Main Methods:
- Induction of microembolism via aortic injection of automicrothrombotic particulates in Sprague-Dawley rats.
- Control group received saline injection (SHAM group).
- Assessment of myocardial injury markers, inflammatory responses, thrombosis, fibrosis, and cardiac function.
Main Results:
- Automicrothrombotic particulate injection significantly increased serum c-troponin I and von Willebrand factor.
- Elevated myocardial leukocyte infiltration, pro-inflammatory cytokine expression (TNF-α, IL-6), and fibrosis were observed.
- Significant reduction in cardiac function and increased arteriolar thrombosis confirmed microembolic effects.
Conclusions:
- Aortic injection of automicrothrombotic particulates successfully induces coronary microembolism in rats.
- The established model demonstrates key pathological and functional changes associated with microembolism.
- This model is valuable for advancing the understanding of coronary microembolism pathophysiology.
