Abstract
Monoclonal antibodies of the OKT series were used to identify circulating T lymphocytes (OKT3+), their helper-inducer (OKT4+) and suppressor-cytotoxic (OKT8+) subsets and cells bearing Ia antigen (OKIa+) in 75 patients with thyroid autoimmune disorders, including 14 Graves' disease, 21 myxoedema, 20 asymptomatic thyroiditis, 12 Hashimoto's thyroiditis and eight simple goitre with superimposed thyroiditis. In the whole population of patients, a negative correlation was observed between the percentage of OKT8+ cells and serum free thyroxine levels whatever the type of thyroiditis. The percentage of OKT8+ cells was decreased in Graves' disease and increased in myxoedema while it reversed after adequate treatment of the two diseases. However, a trend to a decrease in the proportion of OKT8+ cells was still observed in treated Graves' disease and in all the other groups of thyroiditis with euthyroidism. The minor modifications observed for OKT3+ and OKT4+ cells were in relation with those of OKT8+ cells. There was an increased percentage of Ia+ cells in Graves' disease and in Hashimoto's thyroiditis partly reflecting the presence of activated lymphocytes. In conclusion, these data suggest first of all a direct influence of serum T4 on the distribution of circulating OKT8+ cells in addition to documenting the heterogeneity of T cell immunoregulatory factors.
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