Effect of bone marrow-derived monocytes transfected with RNA of mouse colon carcinoma on specific antitumor immunity.
OBJECTIVE
To investigate the effect of bone marrow-derived monocytes transfected with RNA of CT-26 (a cell line of mouse colon carcinoma) on antitumor immunity.


METHODS
Mouse bone marrow-derived monocytes were incubated with mouse granulocyte macrophage colony stimulating factor (mGM-CSF) in vitro, and the purity of monocytes was detected by flow cytometry. Total RNA of CT-26 was obtained by TRIzol's process, and monocytes were transfected by TransMessenger in vitro. The activity of cytotoxic T lymphocytes (CTL) in vivo was estimated by the modified lactate dehydrogenase (LDH) release assay. Changes of tumor size in mice and animal's survival time were observed in different groups.


RESULTS
Monocytes from mouse bone marrow were successfully incubated, and the positive rate of CD11b was over 95%. Vaccination of the monocytes transfected with total RNA induced a high level of specific CTL activity in vivo, and made mice resistant to the subsequent challenge of parental tumor cells. In vivo effects induced by monocytes transfected with total RNA were stronger than those induced by monocytes pulsed with tumor cell lysates.


CONCLUSIONS
Antigen presenting cells transfected with total RNA of CT-26 can present endogenous? tumor antigens, activate CTL, and effectively induce specific antitumor immunity.
Chu
Xiao-Yuan
XY
Department of Oncology, Nanjing General Hospital of PLA, Nanjing 210002, Jiangsu Province, China. zxy_6906@tom.com
Chen
Long-Bang
LB
Zang
Jing
J
Wang
Jing-Hua
JH
Zhang
Qun
Q
Geng
Huai-Cheng
HC
D000818:Animals; D000938:Antigen-Presenting Cells / Q000502:physiology; D000951:Antigens, Neoplasm / Q000235:genetics / Q000276:immunology; D001854:Bone Marrow Cells / Q000166:cytology; D002478:Cells, Cultured; D003110:Colonic Neoplasms / Q000276:immunology* / Q000628:therapy*; D015316:Genetic Therapy / Q000379:methods; D007167:Immunotherapy / Q000379:methods; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D009000:Monocytes / Q000166:cytology / Q000502:physiology* / Q000637:transplantation*; D012334:RNA, Neoplasm / Q000276:immunology*; D014162:Transfection
D000951:Antigens, Neoplasm; D012334:RNA, Neoplasm