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Expression and Purification of the Cystic Fibrosis Transmembrane Conductance Regulator Protein in Saccharomyces cerevisiae
Published on: March 10, 2012
Expression and functional characterization of CFTR in mast cells
M Kulka1, M Gilchrist, M Duszyk
1Pulmonary Research Group, University of Alberta, Edmonton, Canada.
Journal of Leukocyte Biology
|January 10, 2002
Summary
Rat mast cells express functional cystic fibrosis transmembrane conductance regulator (CFTR) chloride channels. CFTR is crucial for chloride flux, impacting mast cell mediator release and potentially allergic responses.
Area of Science:
- Immunology
- Cell Biology
- Physiology
Background:
- Mast cell activation, crucial for immune responses and allergic reactions, depends on chloride ion (Cl-) flux.
- This Cl- flux is essential for maintaining calcium influx and subsequent mediator release, such as histamine.
- The specific chloride channels involved in mast cells, however, remained largely uncharacterized.
Purpose of the Study:
- To investigate the expression and function of chloride channels in rat mast cells.
- To determine if the cystic fibrosis transmembrane conductance regulator (CFTR) is present and functional in mast cells.
- To explore the role of CFTR in mast cell mediator release.
Main Methods:
- Reverse transcriptase-polymerase chain reaction (RT-PCR) was used to detect CFTR mRNA in rat-cultured mast cells (RCMC) and peritoneal mast cells (PMC).
- Immunostaining with an anti-CFTR antibody was performed to confirm CFTR protein expression in these cells.
- Functional assays were conducted to assess CFTR-mediated Cl- flux in response to cyclic AMP (cAMP) elevation.
- The effect of a CFTR inhibitor, diphenylamine-2-carboxylate, on mast cell mediator release was evaluated.
Main Results:
- Both RCMC and PMC were found to contain mRNA for CFTR.
- Immunostaining confirmed the presence of CFTR protein in RCMC and PMC.
- Mast cell CFTR was demonstrated to be a functional chloride channel, mediating Cl- flux upon stimulation with elevated cAMP.
- Inhibition of CFTR-dependent Cl- flux led to a downregulation of mast cell mediator release.
Conclusions:
- Rat mast cells express a functional cystic fibrosis transmembrane conductance regulator (CFTR) chloride channel.
- CFTR plays a significant role in regulating chloride flux within mast cells.
- The findings suggest that CFTR is important for mast cell mediator release, potentially influencing allergic responses.
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