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Response properties of the brainstem neurons of the cat following intra-esophageal acid-pepsin infusion.

Abstract：

:Studies in humans have documented that acute acid infusion into the esophagus leads to decrease in threshold for sensations to mechanical distension of the esophagus. It is not known whether acid infusion leads to sensitization of brainstem neurons receiving synaptic input from vagal afferent fibers innervating the esophagus. The aim of this study was to investigate the correlation of responses of vagal afferents and brainstem neurons after acute infusion of acid (0.1 N HCl)+pepsin (1 mg/ml) into the esophagus of cats. The vagal afferent fibers (n=20) exhibited pressure-dependent increase in firing to graded esophageal distension (5-80 mm Hg). Infusion of acid+pepsin into the esophagus produced a significant increase in ongoing resting firing of five of 16 fibers (31%) tested. However, their responses to graded esophageal distension did not change when tested 30 min after infusion. Pepsin infusion did not change the resting firing and response to esophageal distension (n=4). Twenty-one brainstem neurons were recorded that responded in an intensity-dependent manner to graded esophageal distension. Responses of 12 excited neurons were tested after intra-esophageal acid+pepsin infusion. Neurons exhibited a decrease in threshold for response to esophageal distension and increase in firing after acid+pepsin infusion. The sensitization of response after intra-esophageal acid remained unaffected after cervical (C1-C2) spinal transection (n=3). Results indicate that the esophageal distension-sensitive neurons in the brainstem exhibit sensitization of response to esophageal distension after acute acid+pepsin exposure. The sensitization of brainstem neurons is possibly initiated by increased spontaneous firing of the vagal afferent fibers to acid+pepsin, but not to sensitized response of vagal distension-sensitive afferent fibers to esophageal distension. Results also indicate that spinal pathway does not contribute to sensitization of brainstem neurons.

journal_name

Neuroscience

journal_title

Neuroscience

authors

Medda BK,Sengupta JN,Lang IM,Shaker R

doi

10.1016/j.neuroscience.2005.07.016

keywords:

subject

Has Abstract

pub_date

2005-01-01 00:00:00

pages

1285-94

issue

4

eissn

0306-4522

issn

1873-7544

pii

S0306-4522(05)00766-9

journal_volume

135

pub_type

杂志文章

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