ORIGINAL RESEARCH article
Front. Pharmacol.
Sec. Respiratory Pharmacology
Volume 16 - 2025 | doi: 10.3389/fphar.2025.1677183
Somatostatin receptors 3 and 5 potentiate cholinergic-nerve-mediated contraction in human bronchus
Provisionally accepted
Marion BROLLO1
Stanislas Grassin-Delyle2,3,4
Camille Roquencourt1,3,4Elisabeth Longchampt1Isabelle Miguet-Besson1Matthieu Glorion5Hélène Salvator6
Philippe Devillier1*- 1Hôpital Foch, Suresnes, France
- 2Universite Versailles Saint-Quentin-en-Yvelines UFR Simone Veil Sante, Montigny-le-Bretonneux, France
- 3inserm UMR 1173, Montigny le bretonneux, France
- 4Exhalomics, Suresnes, France
- 5Hopital Foch, Suresnes, France
- 6Hopital Foch Pneumologie, Suresnes, France
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Abstract Aim: The role of somatostatin (SST) in the modulation of cholinergic neurotransmission has not been explored previously in human bronchi. We investigated the effects of SST, selective agonists of the five SST receptors SSTR, and octreotide (a SSTR2,3,5 agonist) on the cholinergic contraction induced in vitro either by acetylcholine or by electrical field stimulation (EFS) in human bronchial rings. Methods: Human bronchial rings (n = 326) were obtained from 32 patients undergoing surgery for lung carcinoma. 5 Hz EFS (biphasic pulse width: 1 ms; constant current: 320 mA for 10 s) induced contractions that reached about ~30% of the maximum contraction caused by 40 Hz EFS. Bronchial rings were stimulated for 240 min in the presence or absence of various concentrations of SST, octreotide, and selective agonists of each of the five SSTR receptors. Furthermore, the tissue and cellular locations of each of the five types of SSTR was determined by immunohistochemistry. Results: SST, octreotide, and the SSTR agonists did not change the resting tone or the contractions produced by the cumulative addition of acetylcholine (10-9 to 10-3 M). In contrast, octreotide and the SSTR3 and SSTR5 agonists significantly increased the EFS-induced contractions. Immunoreactivity for all SSTR subtypes was detected in the airway's neural ganglia. Conclusion: The present study provided new data on the location of SSTR in the human lung: notably, all types of receptor were found in the parasympathetic nerve ganglia of the bronchial wall. We suggest that the activation of prejunctional SSTR3 and SSTR5 receptors potentiates cholinergic-nerve-mediated contraction induced by EFS in human bronchi.
Keywords: somatostatin receptors, human, Lung, Bronchus, Contraction, Expression
Received: 31 Jul 2025; Accepted: 22 Oct 2025.
Copyright: © 2025 BROLLO, Grassin-Delyle, Roquencourt, Longchampt, Miguet-Besson, Glorion, Salvator and Devillier. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence: Philippe Devillier, p.devillier@hopital-foch.com
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