[Effect of lipopolysaccharide on antitumor activity of mouse kupffer cells in vitro].
OBJECTIVE
Kupffer cells (KCs) in the liver constitute the largest group of macrophages with strong immune functions. This study was to investigate the effect of lipopolysaccharide (LPS) on antitumor activity of mouse KCs in vitro.


METHODS
KCs were isolated from the mouse liver by enzyme digestion, and co-cultured with mouse colon cancer cell line CT26 at different effector/target (KCs:CT26) ratios. The inhibitory effect of KCs on the proliferation of CT26 cells at different effector/target ratios, or at a ratio of 10:1 with treatment of LPS was measured by WST-8 colorimetric assay.


RESULTS
The inhibition rate of CT26 cell proliferation was increased along with ascending effector/target ratios: the inhibition rates were 7.86%, 13.37%, 15.51%, 18.86%, 18.79%, 19.24%, and 19.98% when the effector/target ratios were 1:1, 2:1, 5:1, 10:1, 20:1, 50:1, and 100:1, respectively. At an effector/target ratio of 10:1, the inhibitory effect of KCs on CT26 cell proliferation was enhanced by LPS: the inhibition rates were 16.86%, 21.1%, 25.64%, 28.38%, 26.78%, 33.38%, and 38.7% when treated with 0.001, 0.01, 0.1, 1, 10, 100, and 1,000 microg/ml LPS, respectively.


CONCLUSIONS
LPS may activate KCs in vitro, and enhance its antitumor activity as well.
Zhou
Zhi-Wei
ZW
State Key Laboratory of Oncology in South China, Guangzhou, Guangdong, 510060, PR China. zhouzhiw@pub.guangzhou.gd.cn
Wan
De-Sen
DS
Sun
Xiao-Dong
XD
Wang
Guo-Qiang
GQ
Fang
Yu-Jing
YJ
Pan
Zhi-Zhong
ZZ
D000818:Animals; D045744:Cell Line, Tumor; D049109:Cell Proliferation; D002478:Cells, Cultured; D018920:Coculture Techniques; D003110:Colonic Neoplasms / Q000473:pathology*; D007728:Kupffer Cells / Q000166:cytology / Q000187:drug effects* / Q000502:physiology*; D008070:Lipopolysaccharides / Q000494:pharmacology*; D051379:Mice
D008070:Lipopolysaccharides