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. 1997 Sep;92(1):45–52. doi: 10.1046/j.1365-2567.1997.00308.x

Differential expression of CD8 epitopes amongst porcine CD8-positive functional lymphocyte subsets.

H Yang 1, R M Parkhouse 1
PMCID: PMC1363980  PMID: 9370923

Abstract

The swine is a useful model for immunobiological studies as it has a highly heterogeneous lymphocyte pool, containing several subsets not easily accessible in humans and rodents. In particular, the CD8-positive (CD8+) cells contain a variety of lymphocyte subsets, such as alpha beta-T cells, gamma delta-T cells, CD4 CD8 double-positive (DP) cells and natural killer (NK) cells. In order to define these subsets further, we have selected four monoclonal antibodies (mAb) with differential reactivity on CD8+ cells. Thus, mAb CD8.1 (PPT20) bound to CD8hi and CD8lo subpopulations in a similar way to the conventional anti-CD8. The mAb CD8.2 (PPT21), though binding to all of the CD8+ cells, reacted preferably with CD8hi. Two other mAb, CD8.3 (PPT22) and CD8.4 (PPT23), were specific for CD8hi alpha beta-T-cell subpopulation. These results, complemented by immunoprecipitation, co-modulation and enzyme-linked immunosorbent assay experiments, suggest that CD8.1 and CD8.2 react putatively with the CD8 alpha-chain and CD8.3 and CD8.4 with the CD8 beta-chain. Tissue distribution studies revealed that CD8+ thymocytes and peripheral CD8hi alpha beta-T cells expressed both putative CD8 alpha- and beta-chains while peripheral CD4+ CD8+ alpha beta-T cells, CD8lo gamma delta-T cells and NK cells expressed only putative CD8 alpha-chain. Functional studies indicated that the CD8hi alpha beta-T and CD8lo gamma delta-T cells were effector cells in the CD3-redirected cytotoxicity.

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Selected References

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