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Updated: Jun 4, 2026

Whole Mount in Situ Hybridization of E8.5 to E11.5 Mouse Embryos
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Staining mouse embryos for alkaline phosphatase activity.

Andras Nagy, Marina Gertsenstein, Kristina Vintersten

    CSH Protocols
    |March 2, 2011
    PubMed
    Summary
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    This study details a method to visualize human placental alkaline phosphatase (AP) activity in transgenic mice. Heat inactivation removes endogenous AP, allowing visualization of heat-stable human placental AP on cell surfaces.

    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Genetics

    Background:

    • Alkaline phosphatase (AP) is an enzyme with various isoforms.
    • Human placental alkaline phosphatase (hPAP) is a specific AP isoform with unique properties.
    • Visualizing enzyme activity in transgenic models is crucial for understanding gene expression and function.

    Purpose of the Study:

    • To describe a reliable protocol for visualizing human placental alkaline phosphatase (AP) activity in transgenic mice.
    • To enable the study of hPAP expression patterns and localization within a living organism.
    • To differentiate between endogenous AP activity and introduced hPAP activity.

    Main Methods:

    • Development of a protocol for visualizing human placental alkaline phosphatase (AP) activity.

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  • Utilizing transgenic mice engineered to express hPAP.
  • Employing heat inactivation to eliminate endogenous AP activity.
  • Performing AP activity staining localized to the cell surface.

    • Main Results:

    • The protocol successfully visualizes human placental alkaline phosphatase (AP) activity.
    • AP activity staining is specifically localized to the cell surface.
    • Heat inactivation effectively eliminates endogenous AP activity while preserving heat-stable hPAP activity.

    Conclusions:

    • This protocol provides a robust method for detecting hPAP activity in transgenic mice.
    • The technique allows for precise spatial localization of hPAP expression.
    • This method is valuable for research involving transgenic models and AP enzyme activity.