Key result
An efficient protocol using low-concentration collagenase and preplating successfully isolated high-purity primary cardiomyocytes from adult zebrafish hearts that can be cultured for up to 4 weeks.
Why the study?
Primary cardiomyocytes could serve as an alternative tool for studying the intrinsic mechanisms of cardiovascular disease in vitro in adult zebrafish, prompting the development of an efficient isolation protocol.
This study provides an efficient and reproducible protocol for isolating and culturing high-purity primary cardiomyocytes from adult zebrafish for in vitro cardiovascular research.
May enable in vitro studies of zebrafish cardiac regeneration; leaves open translation to mammalian models.
Zebrafish is a popular animal model in regeneration studies due to their ability to regenerate the heart. Primary cardiomyocytes could be an alternative tool for studying the intrinsic mechanisms of cardiovascular disease in vitro . Thus, our objective is to develop an efficient protocol to isolate primary cardiomyocytes from zebrafish hearts. Low concentration of digestive enzyme (0.5 mg/mL collagenase type II) was utilized in our protocol to obtain single-cell suspension. The ventricles were fragmented, mechanically pipetted, and constantly shaken to ensure adequate contact between the tissues and the enzyme. Preplating the cell suspension onto culture plates for 2 h helped remove cardiac fibroblasts. The purity of isolated cells was validated by flow cytometry analysis of transgenic zebrafish with cardiomyocyte-specific expression of enhanced green fluorescent protein (EGFP) or endothelial cell-specific expression of mCherry. Quantitative real-time PCR analysis revealed a high level of the purity, with cardiac fibroblasts, endothelial cells, and epicardial cell markers scarcely detected in the purified cells. Altogether, this study established a reproducible protocol for isolating primary cardiomyocytes with high purity and activity from adult zebrafish hearts that can be cultured in vitro for up to 4 weeks. This protocol provides a valuable tool for studying the intrinsic mechanisms of cardiovascular disease in vitro using primary cardiomyocytes.
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Zhang et al. (2023) studied Cardiovascular disease (in vitro model). Isolation and culture protocol for primary cardiomyocytes was evaluated on Purity and activity of isolated primary cardiomyocytes. An efficient protocol using low-concentration collagenase and preplating successfully isolated high-purity primary cardiomyocytes from adult zebrafish hearts that can be cultured for up to 4 weeks.
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