AIM: To investigate the effects of exogenous; melatonin on bacterial translocation and apoptosis in a rat ulcerative colitis model. METHODS: Rats were randomly assigned to three groups: group I : control, group II : experimental colitis, group III : colitis plus melatonin treatment. On d 11 after colitis, plasma tumor necrosis factor-alpha, portal blood endotoxin levels, colon tissue myeloperoxidase and caspase-3 activity were measured. Bacterial translocation was quantified by blood, lymph node, liver and spleen culture. RESULTS: We observed a significantly reduced incidence of bacterial translocation to the liver, spleen, mesenteric lymph nodes, portal and systemic blood in animals treated with melatonin. Treatment with melatonin significantly decreased the caspase-3 activity in colonic tissues compared to that in trinitrobenzene sulphonic acid-treated rats (16.11 +/- 2.46 vs 32.97 +/- 3.91, P < 0.01). CONCLUSION: Melatonin has a protective effect on bacterial translocation and apoptosis. (C) 2008 WJG, All rights reserved.