Bactericidal mechanisms of human breast milk leukocytes.

AUTOR(ES)

Johnson, D F

RESUMO

The functional capacity of human breast milk phagocytes was evaluated with both bactericidal and biochemical assays. Acridine orange was used as a vital stain for bacteria to directly visualize phagocytosis and killing. Bactericidal capabilities were further examined by colony count and chemiluminescent methods. Cytocentrifuged specimens stained for myeloperoxidase exhibited enzyme activity in breast milk leukocytes equal to that of peripheral neutrophils. A radioisotopic assay of hexose monophosphate shunt activity demonstrated metabolic activity in breast milk leukocytes greater than that in peripheral blood neutrophils. However, the chemiluminescent response of breast cells was negligible, apparently the result of quenching secondary to fat present in the milk; preincubation of human blood leukocytes with the fatty layer of breast milk produced similar inhibition in the chemiluminescence assay. By most parameters breast milk phagocytes are at least equal to blood neutrophils.

Documentos Relacionados

• Bactericidal capacity of phorbol myristate acetate-treated human polymorphonuclear leukocytes.
• Bactericidal activity of fractionated granule contents from human polymorphonuclear leukocytes.
• Hypersusceptibility of penicillin-treated group B streptococci to bactericidal activity of human polymorphonuclear leukocytes.
• Cooperative complement- and bacterial lectin-initiated bactericidal activity of polymorphonuclear leukocytes.
• Antibiotic proteins of human polymorphonuclear leukocytes.