Live-Cell Imaging of the Contractile Velocity and Transient Intracellular Ca Fluctuations in Human Stem Cell-Derived Cardiomyocytes

Overview

Journal Cells

Publisher MDPI

Specialties Biochemistry
Biophysics
Cell Biology
Molecular Biology

Date 2022 Apr 23

PMID 35455960

Authors

Aviseka Acharya

Harshal Nemade

Krishna Rajendra Prasad

Khadija Khan

Jurgen Hescheler

Nick Blackburn

Ruth Hemmersbach

Symeon Papadopoulos

Agapios Sachinidis

Affiliations

Soon will be listed here.

Abstract

Live-cell imaging techniques are essential for acquiring vital physiological and pathophysiological knowledge to understand and treat heart disease. For live-cell imaging of transient alterations of [Ca] in human cardiomyocytes, we engineered human-induced pluripotent stem cells carrying a genetically-encoded Ca-indicator (GECI). To monitor sarcomere shortening and relaxation in cardiomyocytes in real-time, we generated a α-cardiac actinin (ACTN2)-copepod (cop) green fluorescent protein (GFP)-human-induced pluripotent stem cell line by using the CRISPR-Cas9 and a homology directed recombination approach. The engineered human-induced pluripotent stem cells were differentiated in transgenic GECI-enhanced GFP-cardiomyocytes and ACTN2-copGFP-cardiomyocytes, allowing real-time imaging of [Ca] transients and live recordings of the sarcomere shortening velocity of ACTN2-copGFP-cardiomyocytes. We developed a video analysis software tool to quantify various parameters of sarcoplasmic Ca fluctuations recorded during contraction of cardiomyocytes and to calculate the contraction velocity of cardiomyocytes in the presence and absence of different drugs affecting cardiac function. Our cellular and software tool not only proved the positive and negative inotropic and lusitropic effects of the tested cardioactive drugs but also quantified the expected effects precisely. Our platform will offer a human-relevant in vitro alternative for high-throughput drug screenings, as well as a model to explore the underlying mechanisms of cardiac diseases.

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