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Effects of iron deprivation or chelation on DNA damage in experimental colitis

  • Original Article
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International Journal of Colorectal Disease Aims and scope Submit manuscript

Abstract

Background and aims

In inflammatory bowel diseases iron contributes to the formation of DNA adducts through the production of hydroxyl radicals. The aim of our study was to evaluate the effects of dietary or pharmacological iron deprivation in an experimental model of colitis in the rat and its potential protective effect against DNA damage.

Methods

Colitis was induced in rats by intracolonic instillation of dinitrobenzene sulphonic acid. Rats were assigned to an iron-deprived diet or to desferrioxamine preceding the induction of colitis. The severity of colitis was assessed by the presence of bloody diarrhea, colonic macroscopic damage score, body-weight variations and the amount of DNA colonic adducts. Hepatic and colonic iron concentrations were measured.

Results

Treated rats experienced less diarrhea and did not lose weight in comparison to untreated animals. The macroscopic damage score was significantly reduced in the iron-deprived diet for the 5-week group (P=0.03). Liver and colonic iron levels were significantly more reduced in the iron-deprived groups than in the standard diet group (P<0.03 and P<0.01 after a 3- and 5-week iron-deprived diet, respectively). DNA adduct formation was significantly reduced in the groups deprived of iron for 5 weeks (P<0.001) or treated with desferrioxamine (P<0.01).

Conclusions

The degree of colitis caused by DNBS is macroscopically improved by dietary iron deprivation and to a lesser extent by pharmacological chelation; genomic damage is reduced by dietary iron deprivation or chelation, and this may have clinical implications on cancer prevention.

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Acknowledgements

The authors thank Mrs. M. Minotto and Mrs. C. Carlotto for their technical assistance. This work was supported in part by MIUR 60% 2000.

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Authors and Affiliations

  1. Department of Surgical and Gastroenterological Sciences, University of Padua, Via Giustiniani 2, 35128, Padova, Italy

    M. Barollo, R. D’Incà, M. Scarpa, V. Medici, R. Cardin, I. Angriman & G. C. Sturniolo

  2. Department of Internal Medicine and Medical Therapy, University of Messina, Messina, Italy

    W. Fries

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  1. M. Barollo
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  2. R. D’Incà
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  3. M. Scarpa
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  4. V. Medici
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  8. G. C. Sturniolo
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Correspondence to G. C. Sturniolo.

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M. Barollo and R. D’Incà contributed equally to this paper

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Barollo, M., D’Incà, R., Scarpa, M. et al. Effects of iron deprivation or chelation on DNA damage in experimental colitis. Int J Colorectal Dis 19, 461–466 (2004). https://doi.org/10.1007/s00384-004-0588-2

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  • DOI: https://doi.org/10.1007/s00384-004-0588-2

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