International Journal of Colorectal Disease

, Volume 22, Issue 12, pp 1523–1529 | Cite as

Role of l-glutamine and glycine supplementation on irradiated colonic wall

  • Cristina F. Diestel
  • Ruy G. Marques
  • Francisco Lopes-Paulo
  • Daurita Paiva
  • Nara L. Horst
  • Carlos Eduardo R. Caetano
  • Margareth C. Portela
Original Article

Abstract

Background and aims

Radiotherapy is frequently used for cancer treatment, but it may be associated with several complications. Thus, this study aimed to evaluate the role of l-glutamine and/or glycine supplementation on the colonic wall in rats submitted to abdominal radiation.

Materials and methods

Sixty adult Wistar rats were randomly divided into six groups: I—healthy, II (control)—irradiated rats without amino acid supplementation, III—irradiated rats with glycine supplementation, IV—irradiated rats with l-glutamine supplementation, V—irradiated rats with glycine supplementation 7 days before irradiation and with l-glutamine supplementation 7 days after irradiation, and VI—irradiated rats with l-glutamine supplementation 7 days before irradiation and with glycine supplementation 7 days after irradiation. Abdominal irradiation was employed with a dose of 1,000 cGy on the eighth day of the experiment. All animals underwent laparotomy on the 15th day for resection of a colonic segment for stereologic analysis. Parametric and nonparametric tests were used for statistical analysis, with the level of significance set at p ≤ 0.05.

Results

Control animals (group II) presented a significantly smaller total volume of colonic wall when compared to animals of groups I, III, IV, V, and VI. There was a significant increase in mucosal layer volume in the animals of group IV compared to animals of groups I, II, and III.

Conclusions

Our findings suggest that l-glutamine and/or glycine supplementation is beneficial for the repair of the colonic wall of rats, but l-glutamine, with its trophic effects on the colonic mucosa, seems to exhibit better results.

Keywords

Glutamine Glycine Radiotherapy Colitis Nutrition 

Notes

Acknowledgments

The authors wish to thank Dr. Rafael Daher and Dr. Afrâneo Akreman, University Center of Cancer Control—Pedro Ernesto University Hospital—Rio de Janeiro State University, for their support with the irradiation procedure, and Prof. Waldemar Silva Costa, Anatomy Department—Biology Institute Roberto Alcântara Gomes—Rio de Janeiro State University, for his support with stereological analysis. This work was partially supported by a grant from Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ), Brazil.

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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • Cristina F. Diestel
    • 1
  • Ruy G. Marques
    • 1
    • 2
  • Francisco Lopes-Paulo
    • 1
  • Daurita Paiva
    • 1
  • Nara L. Horst
    • 1
  • Carlos Eduardo R. Caetano
    • 1
  • Margareth C. Portela
    • 1
  1. 1.Laboratory of Experimental Surgery, Department of General SurgeryRio de Janeiro State UniversityRio de JaneiroBrazil
  2. 2.Rio de JaneiroBrazil

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