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Intestinal development in the suckling rat: effect of insulin on the maturation of villus and crypt cell functions.

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Buts, Jean-Paul [UCL] Dekeyser, Nadine [UCL] Dive, Charles [UCL]

The influence of insulin on the postnatal development of intestinal functions linked to villus cells (sucrase, lactase, maltase and aminopeptidase) and crypt cells (secretory component of immunoglobulins, SC) has been studied in suckling and weanling rats. At 9 days of age, the animals received a daily injection of insulin 12.5 mU g-1 body weight day-1 for 4 days. Compared with saline-treated controls, insulin had no effect on the development of the intestinal mucosal mass parameters determined in the jejunum, ileum and colon. A premature appearance of sucrase was noted in isolated jejunal villus and crypt cells, the level of activity reached by the enzyme being dependent of the amount of insulin injected. By 6 and 12 h after a single injection of the hormone (12.5 mU g-1 body weight), sucrase activity was detected in all the cell fractions along the villus-crypt axis. In villus cells of insulin-treated rats, maltase, lactase and aminopeptidase activities were significantly (P less than 0.001) increased (+201%, +50%, +207%, respectively, vs. controls), whereas the concentration of SC measured by a sensitive immunoradiometric assay was enhanced over the controls by 75% in villus cells, 83% in crypt cells and 172% in the liver. Weanling rats treated from day 10 to day 20 postpartum with 12.5 mU insulin also exhibited a higher intestinal production of SC (+93%, P less than 0.01) than did saline controls.(ABSTRACT TRUNCATED AT 250 WORDS)

Document type Article de périodique (Journal article) – Journal Article, Research Support, Non-U.S. Gov't
Publication date 1988
Journal information "European journal of clinical investigation" - Vol. 18, no. 4, p. 391-8 (1988)
Peer reviewed yes
issn 0014-2972
Publication status Publié
Affiliation UCL
MESH Subject Aminopeptidases - metabolism ; Animals ; Animals, Suckling ; Dactinomycin - pharmacology ; Intestine, Small - drug effects - growth & development - physiology ; Microvilli - enzymology ; Rats ; Rats, Inbred Strains ; Secretory Component - biosynthesis ; Sucrase - metabolism ; alpha-Glucosidases - metabolism ; beta-Galactosidase - metabolism
Links
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Bibliographic reference Buts, Jean-Paul ; Dekeyser, Nadine ; Dive, Charles. Intestinal development in the suckling rat: effect of insulin on the maturation of villus and crypt cell functions.. In: European journal of clinical investigation, Vol. 18, no. 4, p. 391-8 (1988)
Permanent URL http://hdl.handle.net/2078.1/13974