Neonatology
Postnatal Proximodistal Development of the Small Bowel Mucosal Mass in Growing RatsButs J.-P. · de Meyer R.Laboratory of Experimental Teratology and Medical Genetics and Department of Pediatrics, University of Louvain, Brussels, Belgium
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Article / Publication Details
Published online: September 17, 2009
Issue release date: 1981
Number of Print Pages: 8
Number of Figures: 0
Number of Tables: 0
ISSN: 1661-7800 (Print)
eISSN: 1661-7819 (Online)
For additional information: https://www.karger.com/NEO
Abstract
The development of the duodenal, jejunal, and ileal mucosal mass was studied in five groups of rats killed at different ages during growth. After sacrifice, the small bowel was removed from the pylorus through the ileocecal valve, measured and divided into three equal segments (A, B, C). Gut weight, mucosal weight, DNA, protein, and sucrase activity were determined in each segment. For each segment, results of all mucosal mass parameters expressed per centimeter of gut length markedly increased during weaning (15–30 days), and at 40 days of age they were similar to those obtained in adult animals. A proximal to distal gradient of gut weight was present at birth and increased during lactation. However, the proximodistal gradients of mucosal weight and mucosal DNA per centimeter of length remained constant in all groups studied. The intestinal gradient of sucrase activity was absent at birth and in lactating rats (17 days), but was similar in rats of 30, 40, and 100 days of age. It is concluded that mucosal hyperplasia which occurs in rats at weaning equally develops in the proximal, mid, and distal small bowel.
© 1981 S. Karger AG, Basel
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Article / Publication Details
Published online: September 17, 2009
Issue release date: 1981
Number of Print Pages: 8
Number of Figures: 0
Number of Tables: 0
ISSN: 1661-7800 (Print)
eISSN: 1661-7819 (Online)
For additional information: https://www.karger.com/NEO
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