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Publication type: Journal Article
Document type: Full Paper

Year: 1993

Author(s): Hirt, W; Saalmüller, A; Reddehase, MJ

Title: Expression of gamma/delta T cell receptors in porcine thymus.

Source: Immunobiology (188), 1-2 70-81.


Authors Vetmeduni Vienna:

Saalmüller Armin


Abstract:
Swine possess an extraordinarily high number of T lymphocytes with the phenotype CD4-CD8- in peripheral blood as well as in lymphoid tissues. This subpopulation is subdivided into at least four subsets defined by the expression of CD2 and three biochemically distinct gamma/delta T cell receptors. The four subsets differ largely in their pattern of lymphoid homing in that CD2- subsets, historically referred to as null lymphocytes, predominate in the circulating pool, whereas CD2+ subsets are enriched in lymphoid tissues. Here we document the expression of all three types of gamma/delta T cell receptors by CD4-CD8- porcine thymocytes, which provides the first evidence for a thymic origination of all subsets of porcine gamma/delta T lymphocytes. The biochemical analysis shows that three distinct gamma-chains form disulfide-bonded cell surface heterodimers with a common delta-chain and that glycosylation of all chains is already completed within the thymus. Surprisingly, CD2- subsets, which are known to be enriched among thymic emigrants and which numerically predominate in peripheral blood, are underrepresented in the thymus, suggesting a high export rate.

Keywords Pubmed: Aging - immunology : Animals - immunology : Antigens, CD2 - immunology : Antigens, CD4 - analysis : Antigens, CD8 - analysis : Antigens, Differentiation, T-Lymphocyte - analysis : Antigens, Surface - analysis : Electrophoresis, Polyacrylamide Gel - analysis : Flow Cytometry - analysis : Phenotype - analysis : Receptors, Antigen, T-Cell, alpha-beta - biosynthesis : Receptors, Immunologic - analysis : Swine - analysis : T-Lymphocyte Subsets - immunology : T-Lymphocytes - immunology : Thymus Gland - growth & development

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