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Serum thymic factor is a humoral factor involved in the differentiation of T cells. In the present study, a radioimmunoassay system for STF was established using a specific antiserum and an iodinated synthetic STF as a tracer. Serum levels of STF-like immunoreactivities were around 30 pg/ml in human, but in contrast to previous reports serum STF levels did not show age-dependent decreases. STF-like immunoreactivities of the thymic gland were lower than those of the liver and kidney in rats. The livers of human and pig contained high STF-like immunoreactivities. The rat thymic gland extract showed three peaks of STF-like immunoreactivity by gel filtration of Sephadex G-25 which corresponded to the eluted position of authentic STF, a larger molecular size, and a smaller molecular size of STF, respectively, while the rat liver extract showed two peaks corresponding to the void volume fraction and to the position of authentic STF, respectively. When this void volume fraction was digested by trypsin, three peaks which corresponded to authentic STF, a larger molecular size, and a smaller molecular size of STF were observed. Present studies suggest that serum thymic factor is produced as a larger STF molecule in the liver and kidney.

Establishment of the specific radioimmunoassay for serum thymic factor(STF).