Studies with a monoclonal antibody on the distribution of Thy-1 in the lymphoid and extracellular connective tissues of the dog

Transplantation
J L McKenzie, J W Fabre

Abstract

BALB/c mice were immunized with canine T lymphocytes from lymph node and used in cell fusion experiments to derive monoclonal antibodies to the T lymphocyte surface. The cloned hybrid line F3-20-7 described in this paper was shown to be secreting antibodies directed at canine Thy-1 since (1) the tissue distribution of the antigen corresponded precisely to the tissue distribution expected of canine Thy-1 from previous studies and (2) the antigen purified from F3-20-7 monoclonal antibody affinity columns (a) had the same mobility on sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) as pure rat Thy-1 and (b) could inhibit and assay shown previously to be directed at canine Thy-1 on the basis of cross-reactivity with rat Thy-1. Studies with the fluorescence-activated cell sorter showed that all thymocytes and lymph node T lymphocytes of the dog were Thy-1 positive, establishing that Thy-1 is a T cell marker in the dog, as in the mouse, although the presence of a small percentage of Thy-1-positive B cells could not be entirely excluded. In addition, 15% of the nucleated bone marrow cells were Thy-1 positive, which is similar to the finding in rat bone marrow. Localization studies on frozen sections of skin demonst...Continue Reading

Citations

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