Abstract
Thymus lymphocyte subsets in uraemic rats were studied using monoclonal antibodies. Severe and moderate uraemia was induced in rats, and sham-operated and normal rats were used as the controls. As a result, the weight of the thymus decreased in uraemic rats. As for lymphocyte subsets, the frequency of W3/25+OX8+ decreased and those of W3/25-OX8-, W3/25+OX8- and W3/25- OX8+ relatively increased in uraemic rats. All these changes were more significant in severely uraemic than in moderately uraemic rats. When thymosin fraction 5 (TF5) was administered to severely uraemic rats, the weight of the thymus increased and the lymphocytes subsets normalized. These results suggest that uraemia may cause a maturational impairment of thymus lymphocytes by the depression of thymic hormone secretion.
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