BACKGROUND: In indomethacin-induced jejunal ulceration in the rat, villi undergo both early microvascular injury and shortening that may involve activation of villous smooth muscle. AIM: This study sought to substantiate light microscopic observations using three-dimensional imaging of early villous architectural changes in response to indomethacin. METHODS: At both 2 and 6 h after oral indomethacin 15 mg/kg or vehicle to groups of rats, the vasculature of the small intestine was visualised by both carbon-ink perfusion/confocal microscopy and injection casting. The mucosa was also examined for lesions by dissection microscopy and scanning electron microscopy. RESULTS: In indomethacin-dosed rats examined by scanning electron microscopy and histology, the mucosa at 2 h showed villous shortening and wrinkling of the surface epithelium without epithelial loss; at 6 h, the mucosa was flattened, often with epithelial loss to expose a 'contracted' villous core. Examination of the 'vasculature in carbon-injected tissues indicated significant reductions of both mucosal height and inter-capillary distance at both 2 and 6 h post-indomethacin. Scanning electron microscopy of injection casts at 2 and 6 h indicated similar changes. These changes were not seen in control tissues. CONCLUSION: Histology, confocal microscopy and scanning electron microscopy support the proposal that villous shortening with disruption of surface capillary architecture are early changes in the ulcerative enteropathy induced by nonsteroidal anti-inflammatory drugs.
BACKGROUND: In indomethacin-induced jejunal ulceration in the rat, villi undergo both early microvascular injury and shortening that may involve activation of villous smooth muscle. AIM: This study sought to substantiate light microscopic observations using three-dimensional imaging of early villous architectural changes in response to indomethacin. METHODS: At both 2 and 6 h after oral indomethacin 15 mg/kg or vehicle to groups of rats, the vasculature of the small intestine was visualised by both carbon-ink perfusion/confocal microscopy and injection casting. The mucosa was also examined for lesions by dissection microscopy and scanning electron microscopy. RESULTS: In indomethacin-dosed rats examined by scanning electron microscopy and histology, the mucosa at 2 h showed villous shortening and wrinkling of the surface epithelium without epithelial loss; at 6 h, the mucosa was flattened, often with epithelial loss to expose a 'contracted' villous core. Examination of the 'vasculature in carbon-injected tissues indicated significant reductions of both mucosal height and inter-capillary distance at both 2 and 6 h post-indomethacin. Scanning electron microscopy of injection casts at 2 and 6 h indicated similar changes. These changes were not seen in control tissues. CONCLUSION: Histology, confocal microscopy and scanning electron microscopy support the proposal that villous shortening with disruption of surface capillary architecture are early changes in the ulcerative enteropathy induced by nonsteroidal anti-inflammatory drugs.
Authors: C Yamamoto; K Kawakubo; K Aoyagi; T Matsumoto; M Iida; S Ibayashi; T Kitazono; K Doi; K Kanamoto; M Fujishima Journal: Dig Dis Sci Date: 2001-01 Impact factor: 3.199
Authors: Kamran Rostami; David Aldulaimi; Geoffrey Holmes; Matt W Johnson; Marie Robert; Amitabh Srivastava; Jean-François Fléjou; David S Sanders; Umberto Volta; Mohammad H Derakhshan; James J Going; Gabriel Becheanu; Carlo Catassi; Mihai Danciu; Luke Materacki; Kamran Ghafarzadegan; Sauid Ishaq; Mohammad Rostami-Nejad; A Salvador Peña; Gabrio Bassotti; Michael N Marsh; Vincenzo Villanacci Journal: World J Gastroenterol Date: 2015-03-07 Impact factor: 5.742
Authors: T Mahmud; S Somasundaram; G Sigthorsson; R J Simpson; S Rafi; R Foster; I A Tavares; A Roseth; A J Hutt; M Jacob; J Pacy; D L Scott; J M Wrigglesworth; I Bjarnason Journal: Gut Date: 1998-12 Impact factor: 23.059