ANTIMYCOBACTERIAL ACTIVITY OF LECITHIN-CHOLESTEROL LIPOSOMES IN THE PRESENCE OF PHOSPHOLIPASE A<SUB>2</SUB>

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  • KONDO EIKO
    <I>Department of Tuberculosis National Institute of Health</I>
  • KANAI KOOMI
    <I>The First Department of Bacteriology, National Institute of Health</I>

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  • Antimycobacterial activity of lecithin-cholesterol liposomes in the presence of phospholipase A2
  • Antimycobacterial activity of lecithin

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Description

Tubercle bacilli were preincubated with lecithin-cholesterol liposomes to be subsequently exposed to phospholipase A2. After further incubation in the environment of acidic buffer, viable units in the final mixture were enumerated by inoculating the serial dilutions of an aliquot onto Kirchner agar medium containing horse serum in 5%. Another aliquot was used for lipid analyses to confirm hydrolysis of lecithin. In addition to this bactericidal type of experiments, bacteriostatic tests were also conducted with Kirchner semi-solid agar medium, into which liposome-treated bacilli were inoculated with the enzyme at a time. Various natural and synthetic lecithins different in constituent fatty acids were employed. The results indicated that toxic fatty acids released from lecithin acted to kill the bacilli or to inhibit their growth.

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