Butyrate-induced differentiation of Caco-2 cells is associated with apoptosis and early induction of p21Waf1/Cip1 and p27Kip1
| Autor: | D A, Litvak, B M, Evers, K O, Hwang, M R, Hellmich, T C, Ko, C M, Townsend |
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| Rok vydání: | 1998 |
| Předmět: |
Cyclin-Dependent Kinase Inhibitor p21
Microvilli Tumor Suppressor Proteins Histamine Antagonists Apoptosis Cell Cycle Proteins Cell Differentiation Alkaline Phosphatase Flow Cytometry Gene Expression Regulation Neoplastic Butyrates Ribonucleases Proto-Oncogene Proteins c-bcl-2 Cyclins Butyric Acid Humans Genes Tumor Suppressor Annexin A5 Caco-2 Cells Enzyme Inhibitors Microtubule-Associated Proteins Cyclin-Dependent Kinase Inhibitor p27 Sucrase |
| Zdroj: | Surgery. 124(2) |
| ISSN: | 0039-6060 |
| Popis: | Intestinal mucosal turnover is a process of proliferation, differentiation, and apoptosis; the mechanisms remain largely undefined. The purpose of our study was to (1) assess the relationship between apoptosis and enterocyte differentiation and (2) determine whether the cell-cycle inhibitors, p21Waf1/Cip1 and p27Kip1, or the apoptosis inhibitors, Bcl-2 and Bcl-XL, may be involved.Gut-derived Caco-2 cells were treated with sodium butyrate. Apoptosis was assessed by Hoechst stain, DNA laddering, and annexin V assay; differentiation was determined by alkaline phosphatase and sucrase activity. RNA and protein were analyzed for expression of p21Waf1/Cip1, p27Kip1, and members of the Bcl-2 family.Treatment of Caco-2 cells with sodium butyrate resulted in the concomitant induction of both differentiation (increased alkaline phosphatase and sucrase activity) and apoptosis. Increased levels of p21Waf1/Cip1 and p27Kip1 mRNA and protein were detected at 24 hours, occurring before apoptosis or differentiation; decreased mRNA levels of Bcl-2 and Bcl-XL were noted at 24 hours.Differentiation and apoptosis occurred simultaneously in Caco-2 cells, suggesting that apoptosis may be linked to enterocyte differentiation. The induction of p21Waf1/Cip1 and p27Kip1 and the down-regulation of Bcl-2 and Bcl-XL further suggest a link between the cell-cycle mechanisms regulating enterocyte differentiation and apoptosis. |
| Databáze: | OpenAIRE |
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