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Green tea extract catechin improves internal cardiac muscle relaxation in RCM mice
Xiaoqin Wang1,2, Zhengyu Zhang2, Gang Wu1
1Department of Pediatric Cardiology, West China Second University Hospital, Sichuan University, Chengdu, Sichuan, 610041, China.
Insights
Green tea extract catechin effectively treats diastolic dysfunction in a mouse model of restrictive cardiomyopathy. This treatment improves heart muscle compliance and reduces rigidity caused by troponin mutations.
Area of Science:
- Cardiology
- Pharmacology
- Molecular Biology
Background:
- Diastolic dysfunction involves impaired heart relaxation and filling, often seen in hypertension, diabetes, and cardiomyopathies.
- Restrictive cardiomyopathy (RCM) is characterized by stiffening of the heart muscle.
- A novel RCM mouse model with troponin mutations was developed to study human RCM.
Purpose of the Study:
- To investigate the effects of green tea extract catechin on diastolic dysfunction in an RCM mouse model.
- To analyze ventricular muscle dynamics and pressure changes during systole and diastole.
Main Methods:
- A micro-catheter was inserted into the left ventricle of RCM mice.
- RCM mice were treated with green tea extract catechins.
- Ventricular muscle internal dynamics and pressure were measured.
Main Results:
- Green tea catechin treatment improved ventricular compliance in RCM mice.
- The treatment reduced internal muscle rigidity linked to myofibril hypersensitivity to Ca(2+).
- Diastolic dysfunction was corrected by the green tea extract.
Conclusions:
- Green tea extract catechin demonstrates efficacy in correcting diastolic dysfunction.
- The treatment improves intrinsic compliance of ventricular muscle in RCM.
- This highlights a potential therapeutic strategy for RCM caused by troponin mutations.
Background:
Diastolic dysfunction refers to an impaired relaxation and an abnormality in a heart's filling during diastole while left ventricular systolic function is preserved. Diastolic dysfunction is commonly observed in patients with primary hypertension, diabetes and cardiomyopathies such as hypertrophic cardiomyopathy or restrictive cardiomyopathy. We have generated a restrictive cardiomyopathy (RCM) mouse model with troponin mutations in the heart to mimic the human RCM patients carrying the same mutations.
Results:
In the present study, we have investigated the ventricular muscle internal dynamics and pressure developed during systole and diastole by inserting a micro-catheter into the left ventricle of the RCM mice with or without treatment of desensitizer green tea extracts catechins. Our results demonstrate that green tea catechin is able to correct diastolic dysfunction in RCM mainly by improving ventricular compliance and reducing the internal muscle rigidity caused by myofibril hypersensitivity to Ca(2+).
Conclusion:
Green tea extract catechin is effective in correcting diastolic dysfunction and improving ventricular muscle intrinsic compliance in RCM caused by troponin mutations.
