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in gut mucosal changes after severe burn
Shriners Hospitals for Children and Department of Surgery, University of Texas Medical Branch, Galveston, Texas 77550
Gut epithelial
cell death by apoptosis is increased in the gut epithelium
after severe burn associated with mucosal atrophy. We hypothesized that
tumor necrosis factor (TNF)-
-TNF receptor (TNFR) interaction
activates apoptosis in small bowel mucosal cells after severe
burn. C57BL6 mice received a 30% total body surface area scald burn
and were treated with neutralizing anti-TNF-
. The proximal small
bowel was assessed for mucosal atrophy. Proliferation and
apoptosis of mucosal cells were assessed by proliferative cell
nuclear antigen-immunostaining and terminal deoxyuridine nick-end
labeling assay, respectively. Mucosal height and mucosal cell number
decreased after burn. Anti-TNF-
-treated mice showed significantly
less mucosal atrophy. Proliferation of intestinal cells was not changed
with burn or anti-TNF-
treatment. An over threefold increase in
apoptotic cell number was seen after burn, which was diminished by
anti-TNF-
treatment. Changes in gut mucosal homeostasis after severe
burn are affected, in part, by the activation of apoptosis by
TNF-
-TNFR interaction.
small bowel mucosa; mucosal atrophy; tumor necrosis factor-
; apoptosis; proliferation
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