Variable response to probiotics in two models of experimental colitis in rats

Oren Shibolet*, Fanny Karmeli, Rami Eliakim, Erwin Swennen, Patrizia Brigidi, Paulo Gionchetti, Massimo Campieri, Sara Morgenstern, Daniel Rachmilewitz

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

112 Scopus citations

Abstract

Background and Aim: Clinical and experimental data suggest an important role for intestinal microflora in the pathogenesis of inflammatory bowel disease, and probiotics have been shown to ameliorate pouchitis. We evaluated the effect of different preparations of probiotic bacteria on experimental colitis in rats. Methods: Rats were treated daily intra-gastrically with two probiotic preparations, VSL#3 or Lactobacillus strain GG (LGG), 7 days before induction of colitis and for another week thereafter. Colitis was induced by intracolonic administration of either dinitrobenzene sulfonic acid (DNBS) or iodoacetamide. Rats were killed 7 days after induction of colitis, the colon isolated, washed, weighed, lesion area measured, and mucosa processed for determination of myeloperoxidase (MPO) and nitric oxide synthase (NOS) activities and prostaglandin E2 (PGE2) generation. Results: In rats cotreated with VSL#3 or LGG and iodoacetamide, there was a significant decrease in the lesion area, 98 ± 37 mm2 and 142 ± 43 mm2 , respectively, as compared with 342 ± 66 mm2 in the control group. Colonic wet weight significantly decreased to 1.3 ± 0.1 g/10 cm and 1.4 ± 0.1 g/10 cm, respectively, as compared with 1.7 ± 0.1 g/10 cm. There was also a significant decrease in PGE2 generation, MPO, and NOS activities in the VSL#3 and LGG treatment groups. Presence of VSL#3 bacteria in the rat's colon was confirmed by culture and polymerase chain reaction (PCR) amplification. Neither probiotic preparation had an effect on the extent of colonic damage in DNBS-induced colitis. Conclusion: Both VSL#3 and LGG significantly ameliorated colitis induced by the sulfhydryl-blocker iodoacetamide, but had no effect on the immune-mediated DNBS-induced colitis. The results suggest a possible role for sulfhydryl compounds in the protective effect of probiotic bacteria, and support their use in patients with inflammatory bowel disease.

Original languageEnglish
Pages (from-to)399-406
Number of pages8
JournalInflammatory Bowel Diseases
Volume8
Issue number6
DOIs
StatePublished - Nov 2002
Externally publishedYes

Keywords

  • Experimental colitis
  • Inflammatory bowel disease
  • Probiotics

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