Expressions of intestinal NF-kappaB, TNF-alpha, and IL-6 following traumatic brain injury in rats.
BACKGROUND
NF-kappaB regulates a large number of genes involved in the inflammatory response to critical illness, but it is not well known if and how NF-kappaB is activated in the gut following traumatic brain injury (TBI) and what is the role of cytokine-mediated inflammation in the pathogenesis of acute gut mucosal injury.


METHODS
Male Wistar rats were randomly divided into control and TBI groups, each of which was subgrouped at hours 3, 12, 24, and 72 and on day 7. Parietal brain contusion was produced by a free-falling weight on the exposed dura of the right parietal lobe. NF-kappaB binding activity in jejunal tissue was measured using EMSA and the concentrations of TNF-alpha and IL-6 were detected using ELISA.


RESULTS
NF-kappaB binding activity in the jejunum was significantly increased at 3 h following TBI, was maximal at 72 h, and remained elevated by 7 days postinjury. TNF-alpha and IL-6 concentrations were also significantly increased by 3 h postinjury, but peaked at 24 h and remained elevated on Day 7 postinjury.


CONCLUSIONS
TBI induced a rapid and persistent up-regulation of NF-kappaB and proinflammatory cytokines in the gut, which may play an important role in the pathogenesis of acute gut mucosal injury mediated by inflammation.
Hang
Chun-Hua
CH
Department of Neurosurgery, Clinical School of Medicine, Jinling Hospital, Nanjing University, Nanjing, China. hang1965@public1.ptt.js.cn
Shi
Ji-Xin
JX
Li
Jie-Shou
JS
Li
Wei-Qin
WQ
Wu
Wei
W
D000208:Acute Disease; D000818:Animals; D001835:Body Weight; D001930:Brain Injuries / Q000150:complications / Q000276:immunology* / Q000378:metabolism; D004751:Enteritis / Q000209:etiology / Q000276:immunology / Q000378:metabolism; D015850:Interleukin-6 / Q000378:metabolism*; D007583:Jejunum / Q000276:immunology* / Q000378:metabolism; D008297:Male; D016328:NF-kappa B / Q000378:metabolism*; D009460:Neurologic Examination; D051381:Rats; D017208:Rats, Wistar; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism*
D015850:Interleukin-6; D016328:NF-kappa B; D014409:Tumor Necrosis Factor-alpha