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Cardiomyocytes differentiated in vitro from embryonic stem cells developmentally express cardiac-specific genes and
V A Maltsev1, A M Wobus, J Rohwedel
1Institut für Pflanzengenetik und Kulturpflanzenforschung, Gatersleben, Freie Universität Berlin, Germany.
Circulation Research
|August 1, 1994
Summary
Embryonic stem cell-derived cardiomyocytes exhibit distinct ionic channel profiles and action potentials during differentiation, mirroring early cardiac development. This provides a valuable in vitro model for cardiac research and drug testing.
Area of Science:
- Stem Cell Biology
- Cardiovascular Research
- Developmental Biology
Background:
- Pluripotent embryonic stem cells (ES cells) offer a promising source for generating cardiomyocytes in vitro.
- Understanding the electrophysiological properties of differentiating cardiomyocytes is crucial for studying cardiac development.
Purpose of the Study:
- To characterize the electrophysiological properties of cardiomyocytes derived from D3 ES cells during differentiation.
- To investigate the expression of cardiac-specific genes during ES cell differentiation.
- To establish a reliable in vitro model for studying early cardiac development and for pharmacological/toxicological assessments.
Main Methods:
- Whole-cell patch-clamp technique to analyze ionic currents and action potentials.
- Enzymatic isolation of cardiomyocytes at various differentiation stages.
- Reverse transcription polymerase chain reaction (RT-PCR) to assess gene expression.
- ES cell transfection with a LacZ reporter construct to confirm gene expression patterns.
Main Results:
- Early-stage cardiomyocytes showed K+ and L-type Ca2+ currents but lacked Na+ currents.
- Intermediate-stage cardiomyocytes additionally expressed cardiac-specific Na+ and K+ currents.
- Terminally differentiated cardiomyocytes exhibited increased Ca2+ channel density and diverse K+ currents.
- Gene expression analysis revealed synchronous transcription of alpha- and beta-cardiac myosin heavy chain (MHC) genes with contractions.
- Distinct cell populations with properties of sinus node, atrium, and ventricle were identified based on ionic channel expression.
Conclusions:
- ES cell-derived cardiomyocytes recapitulate key aspects of early cardiac development.
- The characterized ionic channel profiles and action potentials allow for the distinction of various cardiac cell types in vitro.
- This model is suitable for investigating cardiac development and for in vitro pharmacological and toxicological studies.