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Ca2+-activated Cl- channel currents in rat ventral prostate epithelial cells
Sung Joon Kim1, Sun Young Shin, Ji Eun Lee
1Department of Physiology, Sungkyunkwan University School of Medicine, Suwon, Korea. sjoonkim@med.skku.ac.kr
The Prostate
|March 28, 2003
Summary
Calcium-activated chloride channels (Cl(Ca)) in rat prostate secretory epithelial cells facilitate fluid secretion. These channels are crucial for exocrine functions, allowing chloride efflux essential for prostatic secretions.
Area of Science:
- Physiology
- Molecular Biology
- Cell Biology
Background:
- Epithelial fluid secretion relies on chloride (Cl(-)) efflux via calcium-activated chloride channels (Cl(Ca)).
- Understanding prostatic fluid secretion mechanisms is vital.
Purpose of the Study:
- To investigate the properties of whole-cell chloride conductance in rat prostate secretory epithelial cells (RPSECs).
- To elucidate the role of Cl(Ca) in prostatic fluid secretion.
Main Methods:
- RPSECs were isolated and subjected to whole-cell voltage clamp.
- Chloride currents were selectively recorded by replacing cations with N-methyl-D-glucamate.
- Anion permeability and channel blocker effects on I(Cl(Ca)) were analyzed.
Main Results:
- Ionomycin induced an outwardly rectifying, slowly activating chloride current (I(Cl(Ca))) in RPSECs.
- Anion permeability followed the order SCN(-) > I(-) > Br(-) > Cl(-) >> gluconate.
- I(Cl(Ca)) amplitude was reduced by niflumic acid, DPC, DIDS, and NPPB.
Conclusions:
- RPSECs possess Cl(Ca) channels.
- These Cl(Ca) channels likely serve as chloride efflux pathways for prostatic exocrine secretions.