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A stretch-sensitive Cl- channel in human corpus cavernosal myocytes.

S F Fan¹, G J Christ, A Melman

¹Department of Neurobiology and Behavior, State University of New York at Stony Brook, 11794-5230, USA.

International Journal of Impotence Research

|March 31, 1999

Summary

Stretch-sensitive chloride channels were identified in human corpus cavernosal muscle cells. These channels exhibit unique properties, including specific ion permeability and conductance, offering insights into smooth muscle function.

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Area of Science:

Physiology
Molecular Biology
Biophysics

Background:

Smooth muscle cells, including those in the corpus cavernosum, possess ion channels that regulate cellular function.
Understanding the specific ion transport mechanisms in corpus cavernosal smooth muscle is crucial for comprehending erectile function and related pathologies.

Purpose of the Study:

To investigate the presence and characteristics of stretch-sensitive chloride (Cl-) currents and channels in cultured human corpus cavernosal muscle cells.
To elucidate the biophysical properties of these identified stretch-sensitive Cl- channels.

Main Methods:

Patch clamp electrophysiology was employed to record ionic currents and single-channel activity.
Experiments involved varying extracellular chloride concentrations and applying specific blockers to characterize channel behavior.

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Main Results:

Stretch-sensitive Cl- currents and channels were detected in a small subset (5%) of cultured human corpus cavernosal muscle cells.
The channels demonstrated high permeability to Cl- over acetate ions, were blocked by zinc ions (Zn2+), exhibited linear current-voltage relationships between -70 and +60 mV, and had unitary conductances of 140-170 pS.

Conclusions:

Cultured human corpus cavernosal muscle cells possess stretch-sensitive chloride channels.
These channels exhibit distinct biophysical properties, suggesting a potential role in mechanotransduction within this tissue.