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Cellular regeneration as a potential strategy to treat cardiac conduction disorders
Satadru K Lahiri1,2, Mohit M Hulsurkar1,2, Xander Ht Wehrens1,2,3,4,5,6
1Cardiovascular Research Institute.
Abstract:
Loss of atrioventricular conduction system (AVCS) cells due to either inherited or acquired deficits leads to conduction diseases, which can deteriorate into fatal cardiac arrhythmias and sudden death. In this issue of the JCI, Wang et al. constructed a mouse model of atrioventricular block (AVB) by inducing AVCS cell-specific injury using the Cx30.2 enhancer to drive expression of diphtheria toxin fragment A. AVCS cell ablation in adult mice led to irreversible AVB. jkjkIn contrast, AVCS cell injury in neonatal mice was followed by spontaneous recovery in a subset of mice, revealing a limited postnatal time window during which the regeneration of AVCS cells can occur as a result of cellular plasticity. This exciting study paves the way for future research into biological or cellular treatment approaches for cardiac conduction diseases by exploiting the regenerative potential of AVCS cells.
Insights
Cardiac conduction diseases stem from atrioventricular conduction system (AVCS) cell loss. Neonatal mice showed AVCS cell regeneration, suggesting a therapeutic window for cardiac repair.
Area of Science:
- Cardiology
- Regenerative Medicine
- Molecular Biology
Background:
- Loss of atrioventricular conduction system (AVCS) cells causes conduction diseases and fatal arrhythmias.
- Current treatments for cardiac conduction diseases are limited.
Purpose of the Study:
- To investigate the regenerative potential of AVCS cells.
- To establish a mouse model for studying atrioventricular block (AVB).
Main Methods:
- Induced AVCS cell-specific injury using Cx30.2 enhancer-driven diphtheria toxin fragment A expression in mice.
- Compared AVCS cell ablation effects in adult and neonatal mice.
Main Results:
- AVCS cell ablation in adult mice resulted in irreversible atrioventricular block (AVB).
- Neonatal mice with AVCS cell injury exhibited spontaneous recovery, indicating a postnatal regenerative window.
- Cellular plasticity in AVCS cells was observed during this limited postnatal period.
Conclusions:
- A critical postnatal window exists for AVCS cell regeneration.
- This finding opens avenues for biological and cellular therapies for cardiac conduction diseases.
- Exploiting AVCS cell regenerative potential may offer new treatment strategies.
