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Updated: Jun 26, 2026
Analysis of Cardiomyocyte Development using Immunofluorescence in Embryonic Mouse Heart
Published on: March 26, 2015
Intracellular Ionic Remodeling During Fetal Development of Hereditary Cardiomyopathy of the Hamster
Ghassan Bkaily1, Alexandre Normand1, Ashley Jazzar1
1Department of Immunology and Cell Biology, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, QC J1H 5N4, Canada.
Insights
Hereditary cardiomyopathy remodeling begins in fetal development, not postnatally. Early treatment targeting sodium-hydrogen exchanger 1 (NHE-1) may prevent heart failure in hamsters.
Area of Science:
- Cardiovascular Biology
- Developmental Biology
- Genetics
Background:
- Hereditary cardiomyopathy (HCMH) leads to early death.
- Previous studies indicated heart cell remodeling in HCMH occurs postnatally.
- This study investigated if remodeling begins earlier, during fetal development.
Purpose of the Study:
- To test the hypothesis that cardiomyocyte remodeling in hereditary cardiomyopathy of hamsters (HCMH) occurs during fetal development.
- To identify early molecular changes in fetal HCMH cardiomyocytes.
Main Methods:
- Quantitative 3D confocal microscopy.
- Ionic and immunofluorescence techniques.
- Analysis of cardiomyocytes from 15-day-old fetal HCMH and normal hamster (NH) hearts.
Main Results:
- Fetal HCMH cardiomyocytes exhibit increased intracellular calcium, sodium, and reactive oxygen species (ROS).
- Elevated levels of sodium-hydrogen exchanger 1 (NHE-1) were observed in fetal HCMH cardiomyocytes.
- These changes mirror those seen in adult HCMH hearts.
Conclusions:
- Hereditary cardiomyopathy initiates during fetal heart development.
- Targeting NHE-1 early in development could potentially prevent HCMH and subsequent heart failure.
- This suggests a critical window for therapeutic intervention.
Background/Objectives:
The development of hereditary cardiomyopathy associated with early death was known to take place during the patients' lifetime. Previous work showed that remodeling of heart cells in hereditary cardiomyopathy of hamsters (HCMH) took place as early as during postnatal development. The present work tested the hypothesis that cardiomyocyte remodeling in HCMH occurred early in fetal development.
Methods And Results:
Using quantitative 3D confocal microscopy associated with ionic and immunofluorescence, our results showed that, as in the adult heart, cardiomyocytes isolated from 15-day-old fetal HCMH hearts showed an increase in intracellular calcium, sodium, ROS, and sodium-hydrogen exchanger 1 (NHE-1) when compared to age-matched cardiomyocytes of a normal hamster (NH).
Conclusions:
These results demonstrated that hereditary cardiomyopathy occurred during fetal heart development, and that early treatment with an NHE-1 blocker might have prevented the development of hereditary cardiomyopathy and heart failure that occur during the hamsters' lifetime.
