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Type: Journal article
Title: P2X purinoceptor-induced sensitization of ferret vagal mechanoreceptors in oesophageal inflammation
Author: Page, A.
O'Donnell, T.
Blackshaw, L.
Citation: The Journal of Physiology, 2000; 523(2):403-411
Publisher: Blackwell Publishing Ltd
Issue Date: 2000
ISSN: 0022-3751
Statement of
Amanda J. Page, Tracey A. O'Donnell, L. Ashley Blackshaw
Abstract: 1. Using an in vitro single unit recording technique we studied the changes in mechanical and chemical sensitivity of vagal afferent fibres in acute oesophagitis, with particular attention to inflammatory products such as purines. 2. Histologically verified oesophagitis was induced by oesophageal perfusion of 1 mg ml-1 pepsin in 150 mM HCl in anaesthetized ferrets for 30 min on two consecutive days. Controls were infused with 154 mM NaCl. 3. The number of action potentials evoked in oesophageal mucosal afferents by mucosal stroking with calibrated von Frey hairs (10-1000 mg) was stimulus dependent. In oesophagitis responsiveness was reduced across the range of stimuli compared with controls. 4. Topical application of the P2X purinoceptor agonist alphabeta-methylene ATP had no direct excitatory effect on afferents. In oesophagitis, but not in controls, there was a significant increase in responses to stroking with von Frey hairs during superfusion with alphabeta-methylene ATP (1 microM). 5. Mucosal afferents responded directly to one or more chemical stimuli: 26 % (5/19 afferents) responded in controls, and 47 % (7/15 afferents) in oesophagitis. There were no differences in responsiveness to bradykinin (1 microM), prostaglandin E2 (100 microM), 5-hydroxytryptamine (100 microM), capsaicin (1 mM) or hydrochloric acid (150 mM) between control and oesophagitis groups. 6. We conclude that a sensitizing effect of a P2X purinoceptor agonist on mechanosensory function is induced in oesophagitis. This effect is offset by a decrease in basal mechanosensitivity.
Keywords: Esophagus
Neurons, Afferent
Vagus Nerve
Mucous Membrane
Esophagitis, Peptic
Pepsin A
Receptors, Purinergic P2
Adenosine Triphosphate
Physical Stimulation
Reaction Time
Action Potentials
Neural Conduction
Purinergic P2 Receptor Agonists
Rights: © The Physiological Society
DOI: 10.1111/j.1469-7793.2000.00403.x
Appears in Collections:Aurora harvest
Medicine publications

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