Author
Listed:
- Michel G. Desarménien
(CNRS, UMR-5203, Institut de Génomique Fonctionnelle
INSERM, U661
Universités de Montpellier 1 & 2, UMR-5203)
- Carole Jourdan
(CNRS, UMR-5203, Institut de Génomique Fonctionnelle
INSERM, U661
Universités de Montpellier 1 & 2, UMR-5203)
- Bertrand Toutain
(Department of Integrated Neurovascular and Mitochondrial Biology
CNRS UMR6214
INSERM U1083
University of Angers)
- Emilie Vessières
(Department of Integrated Neurovascular and Mitochondrial Biology
CNRS UMR6214
INSERM U1083
University of Angers)
- Sheriar G. Hormuzdi
(Ninewells Hospital and Medical School, University of Dundee)
- Nathalie C. Guérineau
(Department of Integrated Neurovascular and Mitochondrial Biology
CNRS UMR6214
INSERM U1083
University of Angers)
Abstract
Elucidating the mechanisms whereby neuroendocrine tissues coordinate their input and output signals to ensure appropriate hormone secretion is currently a topical issue. In particular, whether a direct communication mediated by gap junctions between neurosecretory cells contributes to hormone release in vivo still remains unknown. Here we address this issue using a microsurgical approach allowing combined monitoring of adrenal catecholamine secretion and splanchnic nerve stimulation in anaesthetised mice. Pharmacological blockade of adrenal gap junctions by the uncoupling agent carbenoxolone reduces nerve stimulation-evoked catecholamine release in control mice and to a larger extent in stressed mice. In parallel, the gap junction-coupled cell network is extended in stressed mice. Altogether, this argues for a significant contribution of adrenomedullary gap junctions to catecholamine secretion in vivo. As such, gap junctional signalling appears to be a substantial component for neuroendocrine function in the adrenal medulla, as it may represent an additional lever regulating hormone release.
Suggested Citation
Michel G. Desarménien & Carole Jourdan & Bertrand Toutain & Emilie Vessières & Sheriar G. Hormuzdi & Nathalie C. Guérineau, 2013.
"Gap junction signalling is a stress-regulated component of adrenal neuroendocrine stimulus-secretion coupling in vivo,"
Nature Communications, Nature, vol. 4(1), pages 1-11, December.
Handle:
RePEc:nat:natcom:v:4:y:2013:i:1:d:10.1038_ncomms3938
DOI: 10.1038/ncomms3938
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