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Am J Physiol Gastrointest Liver Physiol 291: G938-G949, 2006. First published June 22, 2006; doi:10.1152/ajpgi.00090.2006
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HORMONES AND SIGNALING

Intestinal barrier failure during experimental necrotizing enterocolitis: protective effect of EGF treatment

Jessica A. Clark,1 Sarah M. Doelle,1 Melissa D. Halpern,1 Tara A. Saunders,1 Hana Holubec,2 Katerina Dvorak,2 Scott A. Boitano,2,3 and Bohuslav Dvorak1,2

Departments of 1Pediatrics and Steele Children’s Research Center, 2Cell Biology and Anatomy, and 3Physiology, University of Arizona, Tucson, Arizona

Submitted 24 February 2006 ; accepted in final form 19 May 2006

Necrotizing enterocolitis (NEC) is the most common intestinal disease of premature infants. Although increased mucosal permeability and altered epithelial structure have been associated with many intestinal disorders, the role of intestinal barrier function in NEC pathogenesis is currently unknown. We investigated the structural and functional changes of the intestinal barrier in a rat model of NEC. In addition, the effect of EGF treatment on intestinal barrier function was evaluated. Premature rats were divided into three groups: dam fed (DF), formula fed (NEC), or fed with formula supplemented with 500 ng/ml EGF (NEC + EGF); all groups were exposed to asphyxia/cold stress to develop NEC. Intestinal permeability, goblet cell density, mucin production, and composition of tight junction (TJ) proteins were evaluated in the terminal ileum, the site of NEC injury, and compared with the proximal jejunum, which was unaffected by NEC. Animals with NEC had significantly increased intestinal paracellular permeability compared with DF pups. Ileal goblet cell morphology, mucin production, and TJ composition were altered in animals with NEC. EGF treatment significantly decreased intestinal paracellular permeability, increased goblet cell density and mucin production, and normalized expression of two major TJ proteins, occludin and claudin-3, in the ileum. In conclusion, experimental NEC is associated with disruption of the intestinal barrier. EGF treatment maintains intestinal integrity at the site of injury by accelerating goblet cell maturation and mucin production and normalizing expression of TJ proteins, leading to improved intestinal barrier function.

intestinal permeability; tight junctions; rat; epidermal growth factor


Address for reprint requests and other correspondence: B. Dvorak, Dept. of Pediatrics, Univ. of Arizona, 1501 N. Campbell Ave., PO Box 245073, Tucson, AZ 85724-5073 (e-mail: dvorakb{at}peds.arizona.edu)




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