The role of interleukin-6 in inhibition of lung metastasis in subcutaneous tumor-bearing mice.
- K Inoue
- S Okabe
- E Sueoka
- N Sueoka
- T Tabei
- M Suganuma
Affiliations: Endocrinology, Saitama Cancer Center Hospital, Ina, Kitaadachi-gun, Saitama 362-0806, Japan.
- Published online on: January 1, 2000 https://doi.org/10.3892/or.7.1.69
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Metastasis is the most important factor for prognosis in cancer patients, and its occurrence is largely associated with host immune response. We found that the presence of a growing tumor of colon 26, a mouse colon cancer cell line, completely inhibited lung colony formation in a mouse injected with colon 26 intravenously, whereas depletion of effector cells, such as natural killer and T cell subsets, did not affect antimetastasis of colon 26. Since colon 26 releases large amounts of interleukin-6 (IL-6) spontaneously, we studied the association of IL-6 with lung metastasis. Serum IL-6 level increased gradually and reached 12.6 pg/ml five days after inoculation of colon 26 in the back of mice, while at the same time, lung colony formation was inhibited. Moreover, expression of IL-6 mRNA in lung was observed to be associated with elevated serum IL-6 level. We show the first evidence that inhibition of lung metastases in tumor-bearing mice by colon 26 is closely associated with an increase in serum IL-6, but not in cellular immunity.