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CT-1-CP-induced ventricular electrical remodeling in mice
Shu-Fen Chen1, Tao-Zhi Wei2, Li-Ya Rao3
1Central Clinical Laboratory, Affiliated Hospital of Hainan Medical University, Haikou, 570102, China.
Summary
The carboxyl-terminal polypeptide of Cardiotrophin-1 (CT-1-CP) alters cardiac electrical activity in mice, prolonging action potentials and affecting ventricular repolarization with chronic exposure. This peptide influences cardiac conductivity, suggesting adaptive remodeling.
Area of Science:
- Cardiovascular Physiology
- Cardiac Electrophysiology
- Molecular Cardiology
Background:
- Cardiotrophin-1 (CT-1) plays a role in cardiac development and adaptation.
- The carboxyl-terminal polypeptide of CT-1 (CT-1-CP) has not been extensively studied for its chronic effects on cardiac electrical properties.
- Understanding peptide-induced cardiac remodeling is crucial for developing targeted therapies.
Purpose of the Study:
- To investigate the chronic effects of CT-1-CP on ventricular electrical remodeling in a mouse model.
- To analyze changes in electrocardiogram (ECG) intervals and epicardial monophasic action potentials (MAPs) following CT-1-CP administration.
- To determine the impact of CT-1-CP on cardiac conductivity and repolarization dynamics.
Main Methods:
- Synthesized CT-1-CP was administered via intraperitoneal injection to Kunming mice over 1, 2, 3, and 4 weeks.
- Epicardial MAPs and lead II ECG signals were recorded synchronously.
- Analysis included ECG intervals (RR, PR, QRS, QT), QT dispersion (QTd), MAP amplitude (Am), maximum upstroke velocity (Vmax), and action potential durations (APDs) at various repolarization phases (APD30, APD50, APD70, APD90).
Main Results:
- CT-1-CP administration led to significant prolongation of the PR segment and QRS complex, and a decrease in QT and QTc intervals, but increased QT dispersion.
- Epicardial MAP recordings showed increased MAP amplitude, Vmax, and prolonged APDs, particularly in the middle to final repolarization phases (APD50, APD70, APD90), with effects intensifying over time.
- QT dispersion decreased over time in CT-1-CP treated groups after chest opening, contrasting with the control group.
Conclusions:
- Chronic exposure to CT-1-CP induces significant alterations in cardiac electrical properties, including changes in ventricular conduction and repolarization.
- The observed effects suggest an adaptive remodeling process in response to CT-1-CP, characterized by enhanced action potential amplitude and duration.
- CT-1-CP's influence on cardiac electrophysiology warrants further investigation for potential therapeutic or detrimental implications in cardiovascular health.
