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Deprecated: Implicit conversion from float 265.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 J+Burn+Care+Res 2016 ; 37 (2): 97-105 Nephropedia Template TP
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Neutrophil Accumulation in the Small Intestine Contributes to Local Tissue Destruction Following Combined Radiation and Burn Injury #MMPMID25501789
Carter SR; Chen MM; Palmer JL; Wang L; Ramirez L; Plackett TP; Gamelli RL; Kovacs EJ
J Burn Care Res 2016[Mar]; 37 (2): 97-105 PMID25501789show ga
Objective: The threat of nuclear disaster makes combined radiation and thermal burn injury (CRI) a relevant topic when discussing modern trauma, as burn injuries are likely to occur with detonation of a conventional nuclear weapon. Previous studies in a murine model have shown that there is a breakdown of the gut epithelium and subsequent bacterial translocation into mesenteric lymph nodes after CRI. This study examines the early innate immune response of the small intestine following CRI. Methods: Using a previously established murine model of 5 - 5.5Gy total body irradiation combined with 15% total body surface area burn, the injury response of the small intestine was examined at 24, 48 and 72hr by visual assessment, myeloperoxidase and cytokine measurement. Results: At 24hr, intestinal damage as measured by villus blunting, crypt debris and decreased mitosis, was apparent in all injury groups but the derangements persisted out to 72hr only with CRI. The prolonged intestinal damage in CRI was accompanied by a 2-fold (p<0.05) elevation in myeloperoxidase activity over sham animals at 48hr and persisted as a 3-fold (p<0.05) elevation at 72hr post-injury. Corresponding levels of KC were 8-fold (p<0.05) higher than sham at 48hr with persistent elevation at 72hr. Conclusions: An enhanced innate immune response, partially mediated by the influx of neutrophils into the gastrointestinal tract is contributing to the hyperinflammatory state seen following CRI. Attenuation of the local gastrointestinal inflammatory response may play a major role in managing victims following nuclear disaster.