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Riboflavin deficiency: early effects on post-weaning development of the duodenum in rats

Published online by Cambridge University Press:  09 March 2007

Catherine A Yates ,
Gareth S. Evans  and
Hilary J. Powers
Catherine A Yates
Affiliation:
The Institute of Child Health, Sheffield Children's Hospital, Sheffield S5 7AU, UK
Gareth S. Evans
Affiliation:
The Institute of Child Health, Sheffield Children's Hospital, Sheffield S5 7AU, UK
Hilary J. Powers*
Affiliation:
The Centre for Human Nutrition, The University of Sheffield, The Northern General Hospital, Sheffield S5 7AU, UK
*
*Corresponding author: Dr. H. J. Powers, fax +44 114 261 0112, email [email protected]
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Abstract

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The aim of this present study was to identify the earliest point at which riboflavin deficiency affects post-weaning bowel development in rats. After weaning, eighty Wistar rats were weight-matched as pairs, one animal being fed a normal synthetic diet and the other being fed the same diet but deficient in riboflavin. Body weight, feeding and rates of growth were monitored and eight pairs of animals were taken for analysis at 45, 69, 93, 117 and 141 h. Riboflavin status was monitored by determining the erythrocyte glutathione reductase activation coefficient (EGRAC), and hepatic flavins were measured by a fluorescence assay. Changes to the number and dimensions of villi and crypts in the duodenum were determined, as well as crypt division (bifurcation) and the DNA synthesis index of the crypt epithelium by bromodeoxyuridine (BrdU) labelling. Riboflavin deficiency was established in the experimental rats, as demonstrated by a significant increase in EGRAC after 45 h (P<0·001) and decreased liver flavins after 96 h (P<0·001). After 96 h a significant increase in the size and cellularity of the crypts (P<0·001 in both cases) was seen in these riboflavin-deficient animals, with a decreased incidence of bifurcating crypts and of BrdU-labelled cells. No changes to villus number or size were observed. The present study has demonstrated that developmental changes to the duodenal crypt arise shortly after circulating riboflavin measurements show evidence of deficiency. These changes primarily affect cell proliferation and crypt bifurcation, and precede long-term changes such as the reduction of villus number.

Keywords

Riboflavin deficiencyDuodenumProliferationMorphogenesis
Type
Research Article
Information
British Journal of Nutrition , Volume 86 , Issue 5 , November 2001 , pp. 593 - 599
Copyright
Copyright © The Nutrition Society 2001

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