J.Jpn. Surg. Soc.. 91(10): 1524-1533, 1990

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Original article

STUDY ON THE MECHANISM OF TUMOR REGRESSION BY ADOPTIVE IMMUNOCHEMOTHERAPY IN MICE

The mechanism of tumor regression by adoptive immunochemotherapy has been unknown. We examined tumor infiltrating lymphocytes (TILs) and cytokines, using immunohistochemical staining and the histo in situ hybridization (HISH) technique, on Meth A tumor in regression of BALB/c mice. In addition, we examined cytokine activity in the serum of mice with a tumor in regression.
The result of immunohistochemical staining showed that the number of Thy-1⁺cells, Lyt-1⁺cells, OKIa1⁺cells all increased in the tumors in regression compared to those in the tumors in non-regression. However, there were no these TILs in the necrotic part of tumor. This result suggested that TILs released substances which might include cytokines.
A small number of each cytokine mRNA was observed, using HISH with cytokine DNA probes. TNF-α, and-β mRNA were observed in both he tumors in regression and non-regression; while, IFN-β and-γ mRNA were observed only in the tumor in regression.
TNF-α activity in the serum of tumor in regression group was higher than that of he tumor in non-regression group. INF activity in the serum of the tumor in regression group started increasing after adoptive immuno-chemotherapy.
These results show that cytokines as well as TILs have important roles in tumor regression.

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