Related Experiment Videos
K+ channel currents in rat ventral prostate epithelial cells.
Jun Hee Kim1, Eun-Kyung Hong, Hee Sook Choi
1Department of Physiology, Sungkyunkwan University School of Medicine, Suwon 440-746, Korea.
The Prostate
|April 23, 2002
Summary
Rat prostate secretory epithelial cells possess iberiotoxin-sensitive calcium-activated potassium channels. These channels are crucial for regulating exocrine secretions in the prostate, offering new insights into prostate physiology.
Area of Science:
- Urology
- Cell Physiology
- Ion Channel Research
Background:
- The electrophysiological properties of normal prostate tissue are not well understood.
- Ion channel activity and regulation in freshly isolated prostate cells remain largely uninvestigated.
Purpose of the Study:
- To investigate the electrophysiological function of rat prostate secretory epithelial (RPSE) cells.
- To identify specific ion channel currents and their regulatory mechanisms in RPSE cells.
Main Methods:
- RPSE cells were isolated using collagenase treatment.
- Nystatin-perforated, whole-cell voltage clamp techniques were employed on columnar epithelial cells.
- Intracellular calcium concentration ([Ca(2+)](i)) was measured using fura-2 fluorescence.
Main Results:
- Outwardly rectifying K(+) currents, lacking inactivation, were observed upon depolarizing pulses.
- Acetylcholine (ACh) or adenosine triphosphate (ATP) increased outward currents and hyperpolarized membrane potential.
- Ionomycin, ACh, ATP, and uridine triphosphate (UTP) elevated intracellular calcium levels, with TEA, charybdotoxin, and iberiotoxin inhibiting ACh/ATP-induced outward currents.
Conclusions:
- RPSE cells exhibit iberiotoxin-sensitive Ca(2+)-activated K(+) channels.
- These identified channels likely play a significant role in prostate exocrine secretion processes.