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Calmodulin regulates the intracellular trafficking in epithelial cells
C Enrich1, G Apodaca, K E Mostov
1Departamiento de Biologia Celular, Facultad de Medicina, Universidad de Barcelona, Spain.
Zeitschrift Fur Gastroenterologie
|June 1, 1996
Summary
Calmodulin plays a key role in regulating membrane trafficking in epithelial cells. Inhibiting calmodulin with W13 blocked IgA transcytosis while increasing recycling, without affecting IgA internalization.
Area of Science:
- Cell biology
- Molecular biology
- Biochemistry
Background:
- Membrane trafficking is crucial for cellular functions, including transport and signaling.
- Calmodulin is a calcium-binding protein involved in various cellular processes.
- The specific role of calmodulin in epithelial membrane trafficking, particularly IgA transport, requires further elucidation.
Purpose of the Study:
- To investigate the role of calmodulin in membrane trafficking processes in epithelial cells.
- To determine calmodulin's involvement in IgA transcytosis, recycling, and receptor-mediated endocytosis.
Main Methods:
- Utilized Madin-Darby canine kidney (MDCK) cells expressing the polymeric immunoglobulin receptor (pIgR).
- Employed the specific calmodulin antagonist W13 (N-(4-aminobutyl)-5-chloro-2-naphthalenesulfonamide).
- Assessed IgA transcytosis, recycling, and endocytosis using cells cultured on polycarbonate filters (transwells).
Main Results:
- W13 treatment significantly inhibited the transcytosis of IgA.
- Concomitantly, IgA recycling was observed to increase upon W13 treatment.
- No significant modifications were found in the internalization rate of IgA.
Conclusions:
- Calmodulin is a critical regulator of IgA transcytosis and recycling in epithelial cells.
- The findings suggest calmodulin influences the functional state of endocytic compartments.
- Calmodulin's role in membrane trafficking highlights its importance in epithelial barrier function and protein transport.