Aim: To observe the influence of bondage stress on Th1/Th2 cytokines and growth of tumor in mice bearing S180 tumor cells.
Methods: 2 x 10(6) S180 tumor cells were injected subcutaneously into the murine right oxter,and bondage stress was imposed on mice for 8 hours per day,ten days running. Then T lymphocyte proliferation was detected by MTT colorimetry. IFN-gamma and IL-2 secreted by splenocytes was measured by mitogen-activating lymphoblast assay and macrophage NO production assay. At the same time, the levels of IL-4 and IL-10 in serum were detected by ELISA, and the weight of the tumors and thymuses were measured.
Results: Compared with mice only injected with S180 tumor cells, tumor bearing mice suffered from bondage stress showed decreased T lymphocyte proliferation, thymus index, and levels of IFN-gamma and IL-2, but increased levels of IL-4 and IL-10(P<0.05), and tumor weight (P<0.01).
Conclusion: Bondage stress could aggravate the suppression of cellular immunity in mice bearing S180 tumor and promote the T cells to shift towards Th2 type cells, which may be one of the mechanisms of promoting tumor growth by bondage stress.
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