ArticleMethods in molecular biology (Clifton, N.J.)2027
Alkaline Phosphatase Staining of Embryonic Stem Cells.
Article in Methods in molecular biology (Clifton, N.J.), 2027. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Alkaline phosphatase (AP) is a widely utilized histochemical marker for assessing the pluripotent state of embryonic stem (ES) cells. Mouse ES cells maintained in an undifferentiated state exhibit high levels of tissue-nonspecific alkaline phosphatase (TNAP) activity, which sharply declines upon differentiation. AP staining provides a rapid, cost-effective, and reliable method to evaluate ES cell colony morphology, confirm maintenance of pluripotency during routine culture, and monitor the efficiency of differentiation protocols. Here, we describe a detailed protocol for AP staining of mouse ES cells using a chromogenic azo dye coupling method with naphthol AS-BI phosphate substrate and Fast Red Violet LB diazonium salt. This technique produces a vibrant red-purple precipitate in undifferentiated ES cell colonies, while differentiated cells remain unstained, enabling clear visualization and documentation of pluripotency status. The protocol includes optimized fixation conditions that preserve AP enzymatic activity, streamlined staining procedures, and guidelines for image acquisition and interpretation.
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