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Lactase and sucrase-isomaltase gene expression during Caco-2 cell differentiation
E H Van Beers1, R H Al, E H Rings
1Department of Pediatrics G8-260, Academic Medical Centre, Amsterdam, The Netherlands.
The Biochemical Journal
|June 15, 1995
Summary
This study investigates lactase and sucrase-isomaltase gene expression in Caco-2 cells during differentiation. Results show distinct transcriptional regulation for lactase and sucrase-isomaltase, impacting enzyme activity over time.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Caco-2 cells, derived from human colon adenocarcinoma, differentiate into small-intestinal enterocyte-like cells in vitro.
- These cells express key hydrolases, including lactase and sucrase-isomaltase, making them a valuable model for studying intestinal differentiation and gene expression.
Purpose of the Study:
- To investigate the endogenous gene expression of lactase and sucrase-isomaltase in relation to Caco-2 cell differentiation.
- To analyze the mRNA, protein, and enzyme activity profiles of these hydrolases over a 37-day culture period.
Main Methods:
- Caco-2 cells were cultured on permeable supports for up to 37 days.
- Techniques included immunocytochemistry, RNase protection assays, metabolic polypeptide labeling, and enzyme activity assays.
- Analysis focused on a per-cell basis to track gene expression and protein activity.
Main Results:
- Lactase mRNA, protein, and enzyme activity appeared sequentially, peaking at 8-11 days, with activity remaining high due to stability.
- Sucrase-isomaltase mRNA, protein, and activity peaked successively between 11-21 days and remained stable.
- Tight-junction formation was complete by day 6, indicating cell polarization.
Conclusions:
- Biosynthesis of both lactase and sucrase-isomaltase is regulated by mRNA levels, indicating transcriptional control.
- Sucrase-isomaltase activity appears transcriptionally controlled throughout the experiment.
- Lactase activity regulation shifts from biosynthesis control to stability after peak expression, suggesting different regulatory mechanisms for each gene.