Effects of cytokine-induced kill cell (CIK) and IL-2 on the secretion of thyroxine by thyroid papillary carcinoma / 解放军医学杂志

ABSTRACT

Objective To investigate the therapeutic mechanisms for differentiated thyroid cancer by using CIK and IL-2, to find out the better adjunctive clinical therapies for thyroid cancer patients after operation, and to evaluate the effects of cytokine-induced kill cell (CIK) and IL-2 on the secretion of thyroxine by thyroid papillary carcinoma. Methods The samples of thyroid papillary carcinoma were taken from the excised tissues of patient with thyroid cancer, and then dispersed with collagenase and trypsin for culturing. The carcinoma cells were then seeded in 24-well cell culture plates at 37℃, 5% CO2 and 95% humidity for 3 days. At the fourth day, the cells in the wells were separately stimulated four times with different dosage of CIK and IL-2, and the stimulation lasted for 72 hours each time. 12 days later, the solution of T3, T4 was detected with radio-immunity kits, TSH was detected with immuno-radiation kits, and the cell proliferation was detected with mono-nuclear cell direct cytotoxicity assay. Results The thyroid cancer cells did not respond to IL-2 in median and low concentrations, but responded to IL-2 in a higher concentration which may depress the secretary function of thyroid cancer cells. IL-2 of high concentrations can obviously decrease the hormone secretion, such as Thyroxine and Thyrotropin, of papillary carcinoma, and improve the CIK's ability of killing cancer. CIK can kill the cancer cells only when companied with IL-2. Conclusion IL-2 of high concentrations can't inhibit the proliferation of thyroid cancer cells, but can depress the secretary function of thyroid cancer cells, which is different from the killing mechanism of CIK.