Journal
STRESS, NEUROTRANSMITTERS, AND HORMONES: NEUROENDOCRINE AND GENETIC MECHANISMS
Volume 1148, Issue -, Pages 106-111Publisher
WILEY-BLACKWELL
DOI: 10.1196/annals.1410.040
Keywords
intercellular communication; synaptic currents; gap junctional coupling; chromaffin cell excitability; cold exposure; acute rat adrenal slices; dye transfer
Funding
- Centre National do la Recherche Scientifique
- Institut National de la Sante et de la Recherche Medicale
- Reseau National des Genopoles
- Region Languedoc-Roussillon
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To understand the mechanisms by which a prolonged exposure to stress enhances catecholamine secretion, we examined the effects of 5-day cold exposure on cell-cell communication pathways in the rat adrenal medulla. Upon stress, the neurosecretory tissue undergoes dramatic morphofunctional changes resulting in increased chromaffin cell excitability, upregulation of both chemical transmission at the splanchnic nerve terminal-chromaffin cell synapses and spreading of gap junction-permeant Lucifer yellow between cells. All these changes converge to improve the stimulus-secretion coupling efficiency within the adrenal medulla and subsequently to adapt catecholamine release to a sustained organism demand.
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