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Updated: Feb 21, 2026
Author Spotlight: Real-Time Measurements of Calcium and Contractility Parameters in Human Induced Pluripotent Stem Cell-Derived Cardiomyocytes
Published on: May 26, 2023
Simultaneous Measurement of Contraction and Calcium Transients in Stem Cell Derived Cardiomyocytes
A Ahola1, R-P Pölönen2, K Aalto-Setälä2,3
1BioMediTech Institute and Faculty of Biomedical Sciences and Engineering, Tampere University of Technology, Korkeakoulunkatu 10, 33720, Tampere, Finland. antti.l.ahola@tut.fi.
We developed a new method to simultaneously measure cardiomyocyte contraction and calcium transients using video microscopy. This technique offers a powerful, non-invasive tool for studying cardiac function and disease in induced pluripotent stem cell-derived cardiomyocytes (iPSC-CMs).
Area of Science:
- Cardiology
- Stem Cell Biology
- Biophysics
Background:
- Induced pluripotent stem cell-derived cardiomyocytes (iPSC-CMs) are vital for in vitro disease modeling and drug discovery.
- Traditional functional characterization relies on electrophysiology or fluorescent dyes, with limited simultaneous ionic and mechanical assessments.
- Video microscopy offers non-invasive analysis of cardiomyocyte motion, but integration with calcium imaging is challenging due to motion artifacts.
Purpose of the Study:
- To present a novel protocol for simultaneous, video-based measurement of cardiomyocyte contraction and calcium transients.
- To validate the accuracy of this method against established techniques.
- To demonstrate the utility of this approach in patient-specific iPSC-CMs for disease modeling.
Main Methods:
- Developed a protocol for simultaneous video microscopy of contraction and Fluo-4 calcium imaging in iPSC-CMs without image correction.
- Assessed method accuracy by evaluating the impact of fluorescence and background light on measurements.
- Applied the method to compare contraction-calcium dynamics in catecholaminergic polymorphic ventricular tachycardia patient-specific iPSC-CMs and healthy controls.
Main Results:
- Successfully acquired simultaneous data on both ionic (calcium) and mechanical (contraction) activity.
- Validated that the simultaneous method yields comparable data to combined individual measurements.
- Demonstrated the method's ability to reveal contraction-calcium relationships and measure transient time intervals in disease models.
Conclusions:
- The presented protocol enables simultaneous, non-invasive assessment of cardiomyocyte biomechanics and calcium dynamics.
- This integrated approach provides a valuable new tool for cardiac research, disease modeling, and drug development.
- The method shows potential for expansion to other fluorescent reporters beyond calcium dyes.
