摘要
Objective: To investigate the antitumor effect of the IL 6 gene modified erythroleukemia cells combined with low dose cyclophosphamide (Cy) and low dose IL 2 Methods: Mice inoculated with FBL 3 IL 6 in combination with low dose IL 2 and low dose cyclophosphamide (Cy) Results: Mice received combined therapy of FBL 3 IL 6, IL 2 and Cy developed tumors most slowly and survived much longer when compared with mice in control groups, with 5 out of 8 leukemia bearing mice being tumor free 100 days after the combined treatment To further explain the mechanism of the antitumor effects by the combined therapy It was found that combined therapy with low dose Cy, low dose IL 2 and FBL 3 IL 6 achieved maximal cytotoxic effects of nature killer cells and specific cytotoxic T lymphocytes, increased production IL 2, TNF and GM CSF from spleen lymphocytes in tumor bearing mice Vaccination with the FBL3 IL 6 also enhanced the cytotoxic activity of the peritoneal macrophages The results demonstrated that administration of low dose Cy and low dose IL 2 in combination with IL 6 gene modified leukemia vaccine could elicit potent anti leukemia effects, and the mechanisms involved in the antitumor process may include the induction of specific and nonspecific antitumor immunity, reversal of T suppressor cells that mediated local immuno suppression in tumor bearing mice Conclusion: The combined therapy with cytokine gene modified tumor vaccine, low dose of Cy and IL 2 might be a promising approach for the treatment of leukemia
Objective: To investigate the antitumor effect of the IL 6 gene modified erythroleukemia cells combined with low dose cyclophosphamide (Cy) and low dose IL 2 Methods: Mice inoculated with FBL 3 IL 6 in combination with low dose IL 2 and low dose cyclophosphamide (Cy) Results: Mice received combined therapy of FBL 3 IL 6, IL 2 and Cy developed tumors most slowly and survived much longer when compared with mice in control groups, with 5 out of 8 leukemia bearing mice being tumor free 100 days after the combined treatment To further explain the mechanism of the antitumor effects by the combined therapy It was found that combined therapy with low dose Cy, low dose IL 2 and FBL 3 IL 6 achieved maximal cytotoxic effects of nature killer cells and specific cytotoxic T lymphocytes, increased production IL 2, TNF and GM CSF from spleen lymphocytes in tumor bearing mice Vaccination with the FBL3 IL 6 also enhanced the cytotoxic activity of the peritoneal macrophages The results demonstrated that administration of low dose Cy and low dose IL 2 in combination with IL 6 gene modified leukemia vaccine could elicit potent anti leukemia effects, and the mechanisms involved in the antitumor process may include the induction of specific and nonspecific antitumor immunity, reversal of T suppressor cells that mediated local immuno suppression in tumor bearing mice Conclusion: The combined therapy with cytokine gene modified tumor vaccine, low dose of Cy and IL 2 might be a promising approach for the treatment of leukemia
