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Activation of ionic channels by deoxycholate in frog and human cell lines
1Instituto de Ciencias Biomedicas de Abel Salazar, University of Oporto and Faculdade de Medicina Veterinária, Technical University of Lisbon, Portugal.
Experimental Physiology
|June 11, 1999
Summary
Deoxycholate (DOC) activates ion channels in intestinal cells, potentially explaining diarrhea after ileal resection. This study investigated DOC
Area of Science:
- Cell Biology
- Gastroenterology
- Ion Channel Physiology
Background:
- Extensive ileal resection can lead to diarrhea due to increased deoxycholate (DOC) delivery to the colon.
- DOC is known to affect ion transport in various biological systems.
Purpose of the Study:
- To investigate the effect of deoxycholate (DOC) on ion channels in intestinal cell lines (A6 and Caco2).
- To elucidate the mechanism by which DOC influences ion transport at the cellular and membrane level.
Main Methods:
- Patch-clamp technique (whole-cell, cell-attached, and excised inside-out configurations) was used on A6 and Caco2 cells.
- Ion channel activity and cell conductance were measured in response to DOC.
- The effects of inhibitors like DIDS, DPC, amiloride, and gadolinium were assessed.
Main Results:
- DOC significantly increased cell conductance in both A6 and Caco2 cells.
- In Caco2 cells, DOC-induced conductance was partially reduced by amiloride, suggesting activation of amiloride-sensitive channels.
- Patch-clamp studies revealed that DOC directly activates both anionic and cationic channels in Caco2 cell membranes, independent of intracellular factors.
Conclusions:
- Deoxycholate (DOC) directly activates ion channels in intestinal cells at the membrane level.
- These DOC-induced channel activities may contribute to the diarrhea observed after extensive ileal resection.
- The findings highlight a potential mechanism for bile acid-induced fluid and electrolyte imbalance in the gut.