• Journal Article

PEPTIDES DO NOT INDUCE CONTRACTIONS IN GASTROINTESTINAL SMOOTH-MUSCLE IN CALCIUM-FREE SOLUTION

Citation

Mangel, A., FITZ, J. G., & TAYLOR, I. L. (1991). PEPTIDES DO NOT INDUCE CONTRACTIONS IN GASTROINTESTINAL SMOOTH-MUSCLE IN CALCIUM-FREE SOLUTION. General Pharmacology: The Vascular System, 22(6), 1135-1137.

Abstract

1. Smooth muscle from six sites in the cat gastrointestinal tract was evaluated with respect to its ability to generate contractions in calcium-free solutions.

2. Membrane depolarization and carbachol, but not cholecystokinin or neurotensin, increased tension in smooth muscle segments of esophagus, corpus, duodenum, ileum, proximal colon and distal colon in calcium-free solution.

3. Substance-P produced a contractile response in the absence of calcium but only in the corpus and distal colon.

4. These findings indicate that peptide mediated release of intracellular calcium plays a minimal role in activation of cat gastrointestinal smooth muscle.