PMID: 8948431Jun 15, 1995Paper

Lactase and sucrase-isomaltase gene expression during Caco-2 cell differentiation

The Biochemical Journal
E H Van BeersH A Büller

Abstract

The Caco-2 cell line is derived from a human colon adenocarcinoma and differentiates in vitro into small-intestinal enterocyte-like cells, expressing the hydrolases lactase and sucrase-isomaltase. We cultured Caco-2 cells on permeable supports from 0 to 37 days after plating to study endogenous lactase and sucrase-isomaltase gene expression in relation to cell differentiation. Profiles of lactase and sucrase-isomaltase mRNA, protein and enzyme activity were analysed on a per-cell basis, using immunocytochemistry, RNase protection assays, metabolic polypeptide labelling and enzyme activity assays. Tight-junction formation was complete 6 days after plating. Immunocytochemistry of Caco-2 cross-sections showed lactase and sucrase-isomaltase predominantly in the microvillar membrane of polarized cells. mRNA, protein and enzyme activity of lactase appeared consecutively, reaching maximum levels 8-11 days after plating. Whereas lactase mRNA and protein biosynthesis showed a sharp decline after peak levels, lactase activity remained high until 37 days after plating. In contrast, mRNA and protein biosynthesis and activity of sucrase-isomaltase peaked successively 11-21 days after plating, and exhibited comparable levels throughout the e...Continue Reading

Citations

Mar 3, 1998·Journal of Pediatric Gastroenterology and Nutrition·E H Van BeersH A Büller
Jul 21, 1998·Journal of Pediatric Gastroenterology and Nutrition·E H Van BeersH A Büller
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