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Modulation of the Ca(2+)-activated Cl(-) channel by 14-3-3epsilon
1Epithelial Cell Biology Research Centre, Department of Physiology, Faculty of Medicine, Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China.
Biochemical and Biophysical Research Communications
|February 7, 2001
Summary
The 14-3-3epsilon protein inhibits calcium-activated chloride channels (CaCC) in Xenopus oocytes by interacting with calmodulin. This finding suggests potential therapeutic applications for conditions like cystic fibrosis.
Area of Science:
- Molecular Biology
- Ion Channel Physiology
- Cell Signaling
Background:
- The 14-3-3 protein family regulates diverse cellular processes.
- Previous work indicated an association between 14-3-3epsilon and calmodulin.
- Calcium-activated chloride channels (CaCC) play crucial roles in various physiological functions.
Purpose of the Study:
- To investigate the role of 14-3-3epsilon in modulating CaCC activity in Xenopus oocytes.
- To elucidate the interaction pathway involving 14-3-3epsilon, calmodulin, and CaCC.
Main Methods:
- Voltage-clamp electrophysiology was used to measure ionomycin-induced chloride currents.
- Xenopus oocytes were utilized as the experimental model system.
- Antisense oligodeoxynucleotides and specific peptide inhibitors were employed to manipulate protein function.
Main Results:
- Inhibition of 14-3-3epsilon expression potentiated the CaCC current.
- Application of 14-3-3epsilon peptide or a calmodulin inhibitor (W13) suppressed the enhanced current.
- These results indicate an inhibitory role for 14-3-3epsilon in CaCC modulation via the calmodulin pathway.
Conclusions:
- 14-3-3epsilon acts as a negative regulator of CaCC in Xenopus oocytes.
- The modulatory effect is mediated through an interaction with the calmodulin-dependent pathway.
- Further research into 14-3-3epsilon's role in other tissues and its therapeutic potential for cystic fibrosis is warranted.