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. 1990 Feb;69(2):293–297.

Characterization of long-term cultured bovine CD4-positive and CD8-positive T-cell lines and clones.

H Takamatsu 1, T Collen 1, D L Tucker 1, M S Denyer 1
PMCID: PMC1385604  PMID: 1968428

Abstract

Long-term cultured CD4+ or CD8+ bovine T-cell lines and clones were established. The CD8+ T-cell line and clones had a strong lectin-dependent cytotoxicity, whereas the CD4+ T-cell line did not. Both phenotype cell lines grew in an interleukin-2 (IL-2)-dependent manner and expressed 50,000-55,000 MW and 65,000-75,000 MW proteins associated with a putative IL-2 receptor (IL-2R), as demonstrated by the cross-linking of radioiodinated recombinant human IL-2 (rhIL-2). Additional molecules of 13,000 and 27,000 MW were also observed on CD8+ T cells. The binding of rhIL-2 was blocked by crude bovine IL-2, and Scatchard plot analysis of the binding data showed that both phenotype cells expressed two different affinity IL-2R that had equilibrium dissociation constants of 12-20 pm (3000-6000 sites/cell) and 146-490 pM (16,000-25,000 sites/well). Only IL-2 stimulated DNA synthesis in these cell lines, whereas mitochondrial enzymes activity, protein synthesis and protein secretion were enhanced by IL-2, mitogens and phorbol myristate acetate. The supernatant from mitogen-stimulated CD4+ cells was unable to enhance the DNA synthesis of either the CD4+ or CD8+ lines, whereas both freshly prepared Con A blasts and anti-immunoglobulin-treated bovine B cells showed elevated DNA synthesis under the same conditions.

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Selected References

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