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Acetazolamide and renal ammoniagenesis.

S K Chapman, M S Hoover

    The American Journal of Physiology
    |March 1, 1978
    PubMed
    Summary

    Acetazolamide does not inhibit key ammonia-producing enzymes like glutaminase or gamma-glutamyl transpeptidase in vitro. This suggests the drug

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    Area of Science:

    • Biochemistry
    • Pharmacology
    • Renal Physiology

    Background:

    • Acetazolamide is known to abolish ammonium excretion in vivo.
    • The precise mechanism for this effect is not fully understood.
    • Ammoniagenesis, the production of ammonia, is a key process in renal acid-base balance.

    Purpose of the Study:

    • To investigate the in vitro effect of acetazolamide on the activity of major ammonia-producing enzymes.
    • To determine if acetazolamide inhibits ammoniagenesis by targeting these enzymes.

    Main Methods:

    • In vitro enzyme assays were performed.
    • Glutaminase, gamma-glutamyl transpeptidase, and D-glutamyltransferase activities were measured.
    • Enzyme activity was assessed at various acetazolamide concentrations (up to 0.2 mM and 1 mM).

    Main Results:

    • Acetazolamide did not alter glutaminase activity at concentrations up to 0.2 mM.
    • Gamma-glutamyl transpeptidase activity remained unchanged with acetazolamide concentrations up to 0.2 mM.
    • D-glutamyltransferase activity was unaffected by acetazolamide concentrations up to 1 mM.

    Conclusions:

    • The observed abolition of ammonium excretion by acetazolamide in vivo cannot be attributed to direct inhibition of these ammonia-producing enzymes.
    • Acetazolamide's effect on ammonium excretion likely involves other, yet unidentified, mechanisms.
    • Further research is needed to elucidate the exact pathway through which acetazolamide impacts renal ammonia handling.

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