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Semi-Minimal Invasive Method to Induce Myocardial Infarction in Rats and the Assessment of Cardiac Function by an Isolated Working Heart System
Published on: June 11, 2020
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Tetrandrine attenuates left ventricular dysfunction in rats with myocardial infarction
Youyang Wu1, Wei Zhao1, Fanhao Ye1
1Department of Cardiology, The Third Clinical Institute Affiliated to Wenzhou Medical University, Wenzhou, Zhejiang 325000, P.R. China.
Experimental and Therapeutic Medicine
|December 18, 2020
Summary
Tetrandrine treatment improved heart function and reduced cell death in rats with myocardial infarction. This suggests tetrandrine may protect against heart damage by regulating intracellular calcium levels.
Area of Science:
- Cardiovascular Pharmacology
- Myocardial Infarction Research
- Cellular Signaling Pathways
Background:
- Myocardial infarction (MI) leads to left ventricular dysfunction and adverse remodeling.
- Existing treatments have limitations in fully restoring cardiac function post-MI.
- Understanding novel therapeutic targets for post-MI recovery is crucial.
Purpose of the Study:
- To investigate the protective effects of tetrandrine on left ventricular dysfunction and remodeling in a rat model of myocardial infarction.
- To explore the potential mechanisms underlying tetrandrine's cardioprotective actions, focusing on apoptosis and intracellular calcium homeostasis.
Main Methods:
- Establishment of a myocardial infarction model in Sprague-Dawley rats.
- Administration of varying doses of tetrandrine (10, 50, 80 mg/kg) post-MI.
- Assessment of cardiac function via echocardiography (LVIDd, LVIDs, EF%, FS%).
- Histopathological analysis (H&E staining) and apoptosis evaluation (TUNEL staining).
- Biochemical analysis of serum lipids (TG, TC, HDL, LDL).
- Western blot analysis of key intracellular Ca2+ homeostasis-related proteins.
Main Results:
- Tetrandrine significantly alleviated left ventricular dilation (increased LVIDd, LVIDs) and improved systolic function (increased EF%, FS%) in MI rats.
- Histological examination revealed that tetrandrine reduced pathological changes and inhibited myocardial cell apoptosis.
- Tetrandrine treatment favorably modulated serum lipid profiles, decreasing TG, TC, and LDL while increasing HDL.
- Changes in expression of Ca2+ homeostasis proteins were observed, suggesting a role in tetrandrine's mechanism.
Conclusions:
- Tetrandrine demonstrates significant cardioprotective effects, attenuating left ventricular dysfunction and remodeling following myocardial infarction in rats.
- The therapeutic benefits of tetrandrine may be attributed to its ability to inhibit apoptosis and modulate intracellular calcium homeostasis.
- Tetrandrine presents a potential therapeutic agent for managing post-myocardial infarction cardiac complications.
