Differentiation of monocytes and polarized M1/M2 macrophages from human induced pluripotent stem cells

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Here, we present a protocol to differentiate induced pluripotent stem cell (iPSC) into adherent hematopoietic progenitors that release floating CD14+ CD45+ monocytes into the culture medium. We describe steps for iPSC expansion, embryoid body (EB) formation, suspension culture, plating EBs, and recurring harvests of monocytes, a.k.a. “monocyte factory.” We then describe detailed procedures for freezing/thawing of monocytes and differentiation into polarized M1 and M2 macrophages. This protocol provides foundation to study iPSC monocytes and their progenies such as macrophages, microglial, and dendritic cells. For complete details on the use and execution of this protocol, please refer to Karlson et al.1 and Panicker et al.2

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