Modulation of the immune response by plasma protease inhibitors. II. Alpha 2-macroglobulin subunits inhibit natural killer cell cytotoxicity and antibody-dependent cell-mediated cytotoxicity.

Abstract

In two different cytolytic assays, dose-dependent inhibition of antibody-dependent cell-mediated cytotoxicity and natural killing by alpha 2-macroglobulin (alpha 2m) and its subunits was observed. Alpha 2m subunits were approximately four times more inhibitory in both assays than the native alpha 2m molecule on a molar basis. Analysis of trypsin protein… (More)

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