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Enterocytic gene expression in intestinal adaptation: evidence for a specific cellular response
D C Rubin1, E A Swietlicki, J L Wang
1Division of Gastroenterology, Washington University School of Medicine, St. Louis, Missouri 63110, USA.
The American Journal of Physiology
|January 1, 1996
Summary
Following small bowel resection, enterocytes adapt by increasing gene expression for proteins like apo A-IV and I-FABP, aiding gut repair. This response is spatially and temporally regulated, involving villus and crypt cells.
Area of Science:
- Gastroenterology
- Molecular Biology
- Cell Biology
Background:
- Massive small bowel resection triggers gut epithelial adaptation.
- Morphological changes are known, but epithelial cell differentiation and gene response remain unclear.
Purpose of the Study:
- Characterize cell-specific and spatial gene expression patterns in enterocytes after resection.
- Investigate the adaptive response of enterocytic genes, including liver and intestinal fatty acid binding protein (I-FABP) and apolipoproteins A-I and A-IV (apo A-I, apo A-IV).
Main Methods:
- Studied gene expression in rats 48 hours and 1 week after 70% small bowel resection.
- Utilized in situ hybridization and immunohistochemical analyses.
- Examined mRNA and protein levels of I-FABP, apo A-I, and apo A-IV.
Main Results:
- Apo A-IV and I-FABP mRNA levels increased up to 3.5-fold in the adaptive ileum 48 hours post-surgery.
- Enterocytic apo A-IV mRNA and protein expression increased from villus base to tip.
- Apo A-IV mRNA remained elevated at 1 week, while I-FABP levels showed mixed regulation; apo A-I mRNA was not significantly induced.
Conclusions:
- Enterocytes acutely respond to loss of small bowel surface area by upregulating specific gene expression.
- This compensatory enterocytic response is spatially and temporally regulated.
- Initiation of gut adaptation involves complex molecular pathways in villus and crypt cells.