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Related Experiment Video

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A Fluorescent Screening Assay for Identifying Modulators of GIRK Channels

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Somatostatin peptides inhibit basolateral potassium channels in human colonic crypts.

G I Sandle¹, G Warhurst, I Butterfield

¹Molecular Medicine Unit, St. James's University Hospital, University of Leeds, Leeds LS9 7TF, United Kingdom. g.i.sandle@leeds.ac.uk

The American Journal of Physiology

|November 24, 1999

Summary

Somatostatin powerfully inhibits intestinal chloride secretion by decreasing activity of specific potassium channels in human colonic crypts. This G protein-dependent mechanism affects channel calcium sensitivity, impacting fluid balance.

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Area of Science:

Gastroenterology
Cell Physiology
Molecular Pharmacology

Background:

Somatostatin is a key regulator of intestinal function, notably inhibiting chloride secretion.
Potassium channels in the basolateral membrane of colonic crypts play a crucial role in the chloride secretory process.

Purpose of the Study:

To investigate the precise mechanism by which somatostatin affects low-conductance (23-pS) potassium channels in human colonic crypts.
To determine if somatostatin's inhibitory effect on these channels is mediated by a G protein-dependent pathway.

Main Methods:

Utilized patch-clamp recording techniques to monitor potassium channel activity in human colonic crypt cells.
Administered somatostatin and its analog octreotide to both nonstimulated and dibutyryl cAMP-stimulated crypts.
Employed pertussis toxin treatment to assess the involvement of G proteins.

Main Results:

Somatostatin significantly decreased spontaneous potassium channel activity (>80% inhibition) in a voltage-independent manner.
The inhibitory effect of somatostatin was blocked by pertussis toxin, indicating a G protein-dependent mechanism.
Somatostatin and octreotide inhibited potassium channels in both nonstimulated and stimulated crypts, and also abolished thapsigargin-induced channel activity.

Conclusions:

Somatostatin peptides inhibit 23-pS basolateral potassium channels in human colonic crypt cells.
This inhibition occurs via a G protein-dependent pathway.
The mechanism may involve a loss of the channel's inherent calcium sensitivity, impacting intestinal fluid secretion.