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[The pancreatic lipase/colipase system].

G Müller

    Zeitschrift Fur Die Gesamte Innere Medizin Und Ihre Grenzgebiete
    |July 15, 1984
    PubMed
    Summary

    Pancreatic lipase aids fat digestion but bile salts inhibit it. Colipase protein counteracts this bile salt inhibition, restoring lipase activity for efficient fat breakdown.

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    Area of Science:

    • Biochemistry
    • Enzymology

    Context:

    • Pancreatic lipase is crucial for triglyceride hydrolysis at lipid-water interfaces.
    • Bile acid salts physiologically inhibit pancreatic lipase adsorption and activity.
    • Colipase acts as a cofactor, binding to both bile acids and lipase.

    Purpose:

    • To elucidate the mechanism of bile acid inhibition on pancreatic lipase.
    • To investigate the role of colipase in overcoming bile acid-induced inhibition.
    • To characterize the kinetics of pancreatic lipase-mediated lipolysis.

    Summary:

    • Pancreatic lipase facilitates triglyceride digestion, but its function is impaired by bile acid salts.
    • Colipase binds to bile acid-covered surfaces and pancreatic lipase, effectively neutralizing bile acid inhibition.
    • This interaction restores lipase activity, enabling efficient lipolysis, which is further characterized by product activation and biphasic kinetics.

    Impact:

    • Understanding these interactions is vital for comprehending fat digestion and absorption.
    • The findings have implications for managing conditions involving pancreatic insufficiency or maldigestion.
    • Highlights the critical role of colipase in maintaining digestive enzyme function under physiological conditions.

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