[Comparison of immunosuppression induced by different doses of cyclophosphamide in normal mice].

OBJECTIVE

To compare the methods for developing immune-suppressed mice models induced by cyclophosphamide (CTX) with different dosages and ways.

METHODS

The mice were assigned to three groups; distilled water were given by gavage daily to the mice in control group; 60 mg/kg of CTX were given by gavage daily to the mice in CTX-1 group; and the mice in CTX-2 group were intraperitoneally injected (ip) with 200 mg/kg bw of CTX one day before the end of the experiment. The experiment lasted for 30 days.

RESULTS

The body weight, spleen weight, the percentage of lymphocytes in peripheral blood, activities of natural killer cells (NK) and cytotoxic T lymphocytes (CTL) and HC50 in CTX-1 group were significantly lower than those in the control group (P < 0.05). The percentage of T lymphocytes in peripheral blood, the percentage of Th and Ts lymphocytes and Th/Ts ratio in CTX-2 group were significantly higher than those in the control group (P < 0.05). Other immunological indices in CTX-2 group were significantly lower than the control group (P < 0.05).

CONCLUSION

A proper immunosuppressed animal model for the functional food evaluating system could be established by gavaging 60 mg/kg bw of CTX for 30 days or by one intraperitoneal injection (ip) of 200 mg/kg. But the former might be more fitted to establish the immunosuppressed model.