Abstract

Monocyte function was investigated in second (G 2) and third (G 3) generation pigs selected for high and low antibody and cell-mediated immune responsiveness. In groups of pigs from the high- and low-immune response lines, monocyte release of superoxide anion (O 2 −) was assayed in response to phorbol 12-myristate-13-acetate and expression of the Class II MHC (MHC-II) antigens SLA-DR and SLA-DQ, determined using flow cytometry. Analysis of variance using a linear model demonstrated no significant intergroup differences in O 2 − production by lymphokine-activated monocytes from G 2 pigs. In G 3 pigs, there were no significant intergroup differences in the percentage of MHC-II + cells or in the density of expression of either SLA-DR or SLA-DQ. In individual pigs, monocyte SLA-DR and SLA-DQ expression was similar in terms of the percentage of MHC-II + cells and in the magnitude of MHC-II expression. Litter contributed significantly to variation in monocyte O 2 − production in G 2 pigs ( P ≤ 0.005) and SLA-DQ ( P ≤ 0.01) expression. Although the lines differed significantly in correlates of antibody and cell-mediated immune response, there was no apparent effect of selection for high and low immune responsiveness in swine on monocyte O 2 − production and MHC-II expression.

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