Abstract
Interleukin-1 is a potent inhibitor of thyroglobulin and cAMP production in human thyroid cells and the inhibitory effect is enhanced by tumor necrosis factor-alpha and interferon-gamma. In the present study secondary cultures of human thyroid cells produced interleukin-6 and the production was significantly increased after exposure of the cells to recombinant interleukin-1 alpha and -1 beta. This increase was dose-dependent and concomitant of the IL-1 induced decrease in cAMP and thyroglobulin production. Both tumor necrosis factor-alpha and -beta also augmented interleukin-6 production, but less potently than interleukin-1. Interferon-gamma did not affect the production of interleukin-6. The rat thyroid cell line FRTL-5 produced interleukin-6 spontaneously, and the production was enhanced after addition of recombinant interleukin-1 beta. A pathogenetic role of interleukin-6 in autoimmune thyroid disease is suggested.
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