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Apolipoprotein expression and cellular differentiation in Caco-2 intestinal cells.
R D Wagner1, E S Krul, J B Moberly
1Department of Internal Medicine, Washington University Medical School, St. Louis, Missouri 63110.
The American Journal of Physiology
|August 1, 1992
Summary
Culture substratum significantly impacts Caco-2 cell differentiation and apolipoprotein gene expression. Differentiation alters apo B, A-I, A-IV, and E expression, mimicking adult enterocytes, with limited effects from added hormones.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Caco-2 cells are a widely used model for studying intestinal epithelial cell differentiation.
- Apolipoproteins (apo) play crucial roles in lipid metabolism and transport.
- Understanding apo gene expression during differentiation is vital for metabolic research.
Purpose of the Study:
- To investigate the effect of cellular differentiation on apolipoprotein gene expression in Caco-2 cells.
- To compare apo gene expression in cells cultured on different substrata (filter supports vs. plastic dishes).
- To assess the influence of specific soluble factors on apo gene expression during differentiation.
Main Methods:
- Caco-2 cells were cultured for 18 days on porous filter supports and conventional plastic culture dishes.
- Apolipoprotein accumulation in culture media was measured.
- Apolipoprotein mRNA concentrations and editing were analyzed.
- Effects of retinoic acid, 1,25-dihydroxyvitamin D3 [1,25(OH)2D3], and thyroid hormone were evaluated.
Main Results:
- Filter-grown cells showed increased apo B accumulation and edited apo B mRNA compared to plastic-grown cells.
- Plastic-grown cells exhibited higher apo A-I accumulation despite similar mRNA levels.
- Apo A-IV was detected earlier in filter-grown cells, and apo E mRNA/accumulation was higher in plastic-grown cells.
- Cellular differentiation shifted apo gene expression patterns towards those of adult enterocytes, except for apo A-I.
- Hormonal treatments had varied effects on apo mRNA levels, with 1,25(OH)2D3 and thyroid hormone increasing apo B, A-IV, and A-I mRNA, and all three reducing apo E mRNA.
Conclusions:
- The culture substratum significantly influences Caco-2 cell differentiation and apolipoprotein gene expression.
- Cellular differentiation in Caco-2 cells, influenced by culture substratum, alters apolipoprotein gene expression profiles.
- Soluble factors can modulate apolipoprotein gene expression beyond the effects of the culture substratum.