Protocol for isolating and culturing neonatal murine cardiomyocytes

The isolation and culture of neonatal murine cardiac cells are valuable techniques for studying their properties and molecular mechanisms in response to various treatments or conditions. Here, we present a protocol for isolating a high yield of viable neonatal murine cardiac cells, including functional, beating cardiomyocytes. We describe the steps of heart extraction, washing and pre-digestion, digestion, and cell seeding. We detail procedures for mechanical and enzymatic digestions, conducted in a controlled environment within a cell culture incubator. For complete details on the use and execution of this protocol, please refer to Bongiovanni et al.¹.