Immunotherapy of established murine squamous cell carcinoma using fused dendritic-tumor cell hybrids.
OBJECTIVE
To investigate the therapeutic efficacy of fused dendritic-tumor cell hybrids against murine squamous cell carcinoma (SCC).


METHODS
Squamous cell carcinoma VII is a poorly immunogenic murine SCC tumor in C3H/HEN (H-2(K)) mice. Subdermal tumors were established by inoculation in the mid abdomen of mice. Tumor diameters were measured with a Vernier caliper and used as an indication of treatment efficacy. Survival studies were performed on mice with 3-day pulmonary metastasis or subdermal tumors. Dendritic cells were generated from bone marrow and cultured for 8 days. Dendritic cells were harvested and mixed with cultured tumor cells in a 1:1 ratio. Cell fusion was achieved by exposing the cell mixture to an alternate electrical current to bring cells into alignment and close together, followed by a short direct electrical current pulse.


METHODS
Female C3H/HEN mice aged 8 to 12 weeks.


METHODS
Mice with 3-day established SCCVII tumors were vaccinated by inguinal intranodal injection of fusion cells (0.3 x 10(6) per side). To support the development of antitumor immunity, mice were given adjuvant injections intraperitoneally. Anti-OX40R monoclonal antibodies or interleukin 12 were used. Treatment groups included no treatment, anti-OX40R monoclonal antibodies or adjuvant IL-12 alone, fusion cells alone, and fusion cells with adjuvant treatment.


METHODS
Tumor size and overall survival.


RESULTS
Mice treated with adjuvant treatment or fusion cells alone did not show a statistical difference in tumor growth when compared with controls. In contrast, fusion cells with adjuvant treatment demonstrated a significant decrease in tumor size when compared with nontreated mice (P < .001). Treatment with fusion cells also resulted in increased survival in the pulmonary metastasis and subdermal tumor models.


CONCLUSIONS
Immunotherapy with fused dendritic-tumor cell hybrids can significantly affect 3-day established sSCC VII tumor growth.
Lee
Walter T
WT
Center for Surgery Research and Head and Neck Institute, Cleveland Clinic, Cleveland Ohio 44195, USA. wlee_ccf@yahoo.com
Tamai
Hidemasa
H
Cohen
Peter
P
Teker
Aysenur Meric
AM
Shu
Suyu
S
D000818:Animals; D002294:Carcinoma, Squamous Cell / Q000628:therapy*; D002459:Cell Fusion; D003713:Dendritic Cells / Q000276:immunology*; D004195:Disease Models, Animal; D005260:Female; D006822:Hybrid Cells; D007167:Immunotherapy; D051379:Mice; D008809:Mice, Inbred C3H; D014407:Tumor Cells, Cultured / Q000276:immunology*