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Structure-function activity of azasterols and nitrogen-containing steroids

J J Kabara, D L Holzschu, D P Catsoulacos

    Lipids
    |October 1, 1976
    PubMed
    Summary

    Nitrogen-containing steroids inhibited bacterial and yeast growth, suggesting they act as membrane effectors rather than solely impacting sterol metabolism. These findings offer new insights into azasteroid mechanisms of action.

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    Area of Science:

    • Biochemistry
    • Microbiology
    • Medicinal Chemistry

    Background:

    • Nitrogen-containing steroids are known to interfere with sterol metabolism.
    • Previous research indicates these compounds can inhibit various metabolic pathways.

    Purpose of the Study:

    • To investigate the antimicrobial activity of 39 nitrogen-containing steroids.
    • To explore the structure-activity relationship of azasteroids concerning their biological effects.
    • To elucidate the mechanism of action of these compounds, particularly their impact on membrane function.

    Main Methods:

    • Antimicrobial susceptibility testing against gram-negative bacteria, gram-positive bacteria, and yeast.
    • Structure-function analysis to correlate chemical structure with observed biological activity.

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  • Hypothesis generation based on observed inhibition patterns and known biochemical pathways.

    • Main Results:

    • Significant inhibition of bacterial and yeast growth was observed across various nitrogen-containing steroids.
    • Low minimal inhibitory concentrations (MICs) were noted for sterol-producing yeast.
    • Bacterial growth inhibition occurred despite bacteria lacking sterols, challenging the sterol metabolism inhibition hypothesis.
    • No clear correlation was found between biological activity and hypocholesterolemic effects.

    Conclusions:

    • Azasteroids may function primarily as membrane effectors, disrupting cellular processes.
    • Observed effects on mitochondria, such as altered adenosine triphosphate levels or dehydrogenase activity, are proposed as a key mechanism.
    • The impact on sterol metabolism might be a secondary consequence rather than the primary mode of action for these compounds.