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Bactericidal activity of rat leucocytic extracts. I. Antibacterial spectrum and the subcellular localization of the

M FISHMAN, M S SILVERMAN

    The Journal of Experimental Medicine
    |June 1, 1957
    PubMed

    Insights

    Rat polymorphonuclear leucocyte extracts exhibit potent bactericidal effects, primarily from their mitochondrial fraction. This extract effectively combats both Gram-positive and Gram-negative bacteria, with greater efficacy against Gram-positive strains.

    Area of Science:

    • Microbiology
    • Cell Biology
    • Immunology

    Background:

    • Polymorphonuclear leucocytes (PMNs) are crucial immune cells involved in bacterial clearance.
    • Understanding the specific bactericidal components within PMNs can lead to novel antimicrobial strategies.

    Purpose of the Study:

    • To investigate the bactericidal activity of rat polymorphonuclear leucocyte extracts.
    • To identify the cellular fraction responsible for the observed antimicrobial effects.

    Main Methods:

    • Rat polymorphonuclear leucocytes were extracted using ultrasonic vibration.
    • The bactericidal activity of the total extract and its fractions against various bacteria was assessed.

    Main Results:

    • The total extract of rat polymorphonuclear leucocytes demonstrated bactericidal activity against Staphylococcus aureus.
    • Bactericidal activity was predominantly localized within the mitochondrial fraction of the leucocytes.
    • The mitochondrial extract proved effective against a range of Gram-positive (e.g., M. aureus, beta-Streptococci) and Gram-negative bacteria (e.g., Shigella dysenteriae, Salmonella enteritidis).
    • Gram-positive bacteria were more susceptible to the mitochondrial extract's bactericidal effects.

    Conclusions:

    • Mitochondrial fractions of rat polymorphonuclear leucocytes possess significant bactericidal properties.
    • These findings suggest a potential role for leucocyte mitochondria in innate immunity and bacterial defense.
    Keywords:
    BACTERIA/effect of drugs onLEUKOCYTESMITOCHONDRIAPHAGOCYTOSIS

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