Expression of interleukin 6 in brain and colon of rats with TNBS-induced colitis.
OBJECTIVE
To characterise expression of interleukin 6 (IL-6), a potent proinflammatory cytokine, in the occurrence and development of inflammatory bowel disease (IBD) and investigate its effect on neuroimmunomodulation and immune homeostasis regulation.


METHODS
In this study, rats with colitis induced by trinitrobenzene sulfonic acid (TNBS) were sacrificed on days 3, 7, 14, 21 and 28 after induction. In the controls, the TNBS was just replaced by equivalent amount of phosphate buffered solution (PBS, 0.01 mol/L). IL-6 mRNA expression in brain and colon tissues in each phase was evaluated by real-time reverse transcription-polymerase chain reaction, and cellular localisation and protein level of IL-6 was determined by immunohistochemistry.


RESULTS
At day 7, mRNA expression of IL-6 was significantly higher in the colon and brain of IBD rats than that of the controls. The protein level was also significantly higher in colon, hypothalamus and cerebral cortex of IBD rats compared with the controls. So there are similar temporal trends in IL-6 mRNA expression and protein levels in all positions with a persistent increase to a peak at day 7, followed by a decline and gradual return to normal levels.


CONCLUSIONS
These results revealed that changes in IL-6 expression in brain and colon tissues occur in different phases of IBD. Therefore, we propose that the nerve centre regulates and controls the occurrence and development of IBD via IL-6.
Wang
Kai
K
Jilin Provincial Key Laboratory of Animal Embryo Engineering, College of Animal Science and Veterinary Medicine, Jilin University, 5333 Xi'an Avenue, Changchun 130062, Jilin Province, China.
Yuan
Chuan-Ping
CP
Wang
Wei
W
Yang
Zhan-Qing
ZQ
Cui
Wei
W
Mu
Lian-Zhi
LZ
Yue
Zhan-Peng
ZP
Yin
Xiu-Ling
XL
Hu
Zhong-Ming
ZM
Liu
Ju-Xiong
JX
D000818:Animals; D001483:Base Sequence; D001921:Brain / Q000276:immunology; D003092:Colitis / Q000139:chemically induced / Q000235:genetics* / Q000276:immunology*; D003106:Colon / Q000201:enzymology / Q000276:immunology / Q000473:pathology; D017931:DNA Primers / Q000235:genetics; D004195:Disease Models, Animal; D005260:Female; D015870:Gene Expression; D006801:Humans; D015212:Inflammatory Bowel Diseases / Q000209:etiology; D015850:Interleukin-6 / Q000235:genetics* / Q000378:metabolism; D015213:Neuroimmunomodulation; D009195:Peroxidase / Q000378:metabolism; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D051381:Rats; D017208:Rats, Wistar; D014302:Trinitrobenzenesulfonic Acid / Q000633:toxicity
D017931:DNA Primers; D015850:Interleukin-6; D012333:RNA, Messenger; D014302:Trinitrobenzenesulfonic Acid; D009195:Peroxidase
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