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• W1964397788 abstract "The effect of propylthiouracil (PTU) on the lytic activity of complement in rat serum was investigated in vivo. Rats (180+/-10 g) were treated daily by gavage with PTU doses of 1-50 mg/200 g body weight for time intervals ranging from 1 to 30 days. Serum classical pathway (CP) and alternative pathway (AP) activities were determined 24 h after the last dose. A single dose of 50 mg/200 g body weight was administered to additional groups and the animals were sacrificed after periods of 1-48 h. The results showed a relatively small reduction ( approximately 30%) in CP activity, evident only in animals treated with 50 mg of PTU for three weeks. However, a clear and opposite effect of PTU, an increase in lytic activity reaching values up to 180% of controls, was observed on AP activity. This effect was seen at all PTU doses used, and occurred within 4 days of treatment with the highest dose. Maximum activity was observed at intermediate intervals, depending on the PTU dose, with a return to control levels occurring after the longer periods of treatment. The lytic activity of serum from animals treated with a single PTU dose of 50 mg/200 g body weight and sacrificed 1-48 h after dosing did not differ from controls. Serum levels of thyroid hormone (triiodo L-thyronine, T3, and thyroxine, T4) were determined in representative groups of treated animals (injected with 5 mg of PTU/200 g body weight/day). These were either undetectable or considerably lower than those of controls. The serum PTU levels of these rats increased for up to 22 days, reaching values of 2-4 microg/ml.PTU is described in the literature as a modulator of both cellular immune responses and antibody production. Upon complement activation fragments of complement components bind to immune complexes and to specific receptors on cells of the immune system. Thus, alteration in AP activity caused by PTU treatment suggests a possible mechanism by which the drug exerts its modulatory effect. Increased complement AP activity might affect events as antigen presentation and hence the onset and course of the immune response." @default.
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• W1964397788 date "2000-01-01" @default.
• W1964397788 modified "2023-09-26" @default.
• W1964397788 title "The effect of the antithyroid drug propylthiouracil on the alternative pathway of complement in rats" @default.
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• W1964397788 doi "https://doi.org/10.1016/s0192-0561(99)00061-2" @default.
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