Abstract:

BACKGROUND: Dendritic cell is an ideal carrier of tumor antigen due to the presenting function and the promotion of T cell proliferation. How to obtain large numbers of dendritic cells is important for producing tumor vaccine.
OBJECTIVE: To induce, culture, amplify and cryopreserve dendritic cells derived from mouse bone marrow, then compare the biological characters of cryopreserved dendritic cells with the fresh dendritic cells, than find an effective method to obtain and store large numbers of dendritic cells.
METHODS: Dendritic cells from mouse bone marrow cells were induced, cultured and amplified in complete medium with recombinant mouse granulocyte-macrophage colony-stimulating factor (rmGM-CSF) (10 μg/L) and recombinant mouse interleukin 4 (rmIL-4) (5 μg/L). On day 6, the dendritic cells were frozen in complete medium with dimethyl sulphoxide. After thawing, lipopolysaccharide was added to induce the maturation. At last, large number of mature dendritic cells was obtained. Then the viability, morphology, dendritic cells markers and mixed lymphocyte reaction were compared between the thawed cells and fresh cells.
RESULTS AND CONCLUSION: After thawing, the recovery rate of cells was (82.2±4.73)%. The survival cells became mature dendritic cells induced by lipopolysaccharide. Compared with fresh dendritic cells, there was no significant difference in morphology, dendritic cells markers and mixed lymphocyte reaction. Results suggest that there was no significant difference in biological characters between frozen-thawed dendritic cells and fresh dendritic cells. To store dendritic cells through cryopreservation can avoid repeating culture in different times and can obtain large numbers of dendritic cells.