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Am J Physiol Regul Integr Comp Physiol 274: R1220-R1227, 1998;
0363-6119/98 $5.00
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Vol. 274, Issue 5, R1220-R1227, May 1998

Rat trehalase: cDNA cloning and mRNA expression in adult rat tissues and during intestinal ontogeny

Thomas J. Oesterreicher, Nanda N. Nanthakumar, John H. Winston, and Susan J. Henning

Department of Pediatrics, Baylor College of Medicine, Houston, Texas 77030

A partial rat trehalase cDNA has been cloned and used to examine trehalase mRNA expression. Northern blotting with total RNA from 11 adult rat tissues showed a trehalase transcript only in small intestine, where it was abundant in proximal regions but declined steeply toward the ileum. During development, trehalase mRNA was not detectable in jejunum until postnatal day 19 and then increased markedly through day 25. Modest levels of trehalase mRNA were induced precociously by administration of dexamethasone, with increasing responsiveness evident between the first and second postnatal weeks. In contrast, analysis of sucrase-isomaltase mRNA on the same blots showed maximal induction at both ages. In adrenalectomized animals, the ontogenic increase of trehalase mRNA began as usual but proceeded more slowly than in control animals. Overall, trehalase mRNA expression in the rat displayed both similarities and differences compared with rabbit. Moreover, the differences revealed in glucocorticoid responsiveness of trehalase mRNA and sucrase-isomaltase mRNA suggest that the actions of these hormones on the developing intestine may be more complex than previously recognized.

sequence analysis; cephalocaudal gradient; glucocorticoid; adrenalectomy


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