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Related Experiment Videos

Alkaline phosphatase expression in human chorionic villi.

G Novelli, F Mannello, E V Cosmi

    Experimental Cell Biology
    |January 1, 1987
    PubMed
    Summary
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    Researchers identified two distinct alkaline phosphatase types in chorionic villi, each with two isoforms. This finding aids in understanding genetic control and potential early fetal diagnosis of hypophosphatasia.

    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Genetics

    Background:

    • Alkaline phosphatase (ALP) is a crucial enzyme involved in various physiological processes.
    • Understanding ALP isoforms in early development is vital for diagnosing genetic disorders.

    Purpose of the Study:

    • To investigate the physicochemical properties and electrophoretic mobility of alkaline phosphatase in chorionic villi.
    • To identify and characterize distinct types and isoforms of alkaline phosphatase in trophoblast cells.

    Main Methods:

    • Selective inactivation and inhibition studies (thermal stability, urea, EDTA, L-amino acid inhibition).
    • Polyacrylamide gel electrophoresis (PAGE) at pH 6.0 and 9.5.
    • Analysis of electrophoretic mobility and enzyme activity.

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    Main Results:

    • Evidence for two distinct types of alkaline phosphatase in trophoblast cells: one unique to chorionic villi and another also found in term placenta.
    • Both types exhibit two isoforms, observable via PAGE.
    • Differential inactivation and inhibition patterns distinguish the ALP types.

    Conclusions:

    • The study confirms the presence of unique and shared alkaline phosphatase types in chorionic villi.
    • Characterization of these isoforms provides insights into early fetal development and genetic control.
    • Potential application in first-trimester diagnosis of infantile hypophosphatasia using ALP analysis.