Cytotoxic effectors in human peripheral blood mononuclear cells induced by a mannoprotein complex of Candida albicans: a comparison with interleukin 2-activated killer cells.

Abstract:

:In this study, the major histocompatibility complex-unrestricted cytotoxic effectors elicited in human peripheral blood mononuclear cells (PBMC) by a mannoprotein (MP) component from the cell wall of the human indigenous microorganism Candida albicans have been compared with those obtained by stimulation with interleukin 2. (Interleukin 2-activated killer cells: LAK). It has been found that MP-induced lytic effectors were substantially similar to LAK in potency, target specificity, and type of precursor/effector cells. In both cases, natural killer (NK)-susceptible and NK-resistant targets as well as fresh tumor (glioma) cells were efficiently killed by a population of effectors showing a predominant CD3-, CD16+ phenotype. However, the precursors of MP-induced killers were highly sensitive to the lysosomotropic toxic drug L-leucine methyl ester (Leu-OME) whereas the generation of LAK cells was unaffected by this drug. The Leu-OME sensitivity of MP-induced cytotoxicity generation was not due to a nonspecific effect on antigen-presenting cells or inhibition of cell proliferation. In addition, the generation of MP-induced killer cells was totally abrogated by treatment with CD16 antibodies and complement, whereas a minor but significant fraction of LAK precursors was not susceptible to the above treatment. These results indicate that a defined component(s) of the cell wall of C. albicans has some properties of biological response modifiers in cultures of human PBMC in vitro.

journal_name

Cell Immunol

journal_title

Cellular immunology

authors

Ausiello CM,Palma C,Spagnoli GC,Piazza A,Casciani CU,Cassone A

doi

10.1016/0008-8749(89)90033-6

subject

Has Abstract

pub_date

1989-07-01 00:00:00

pages

349-59

issue

2

eissn

0008-8749

issn

1090-2163

pii

0008-8749(89)90033-6

journal_volume

121

pub_type

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