Abstract
Vagotomy and capsaicin treatment attenuate dorsal vagal complex (DVC) but not myenteric Fos-like immunoreactivity (Fos-LI) induced by cholecystokinin-8 (CCK-8). The goal of this experiment is to test the role of the sympathetic nervous system in the pathway by which CCK-8 increases myenteric Fos-LI. Adult male Sprague-Dawley rats were pretreated with guanethidine sulfate (40 mg/kg daily for 5 weeks) or vehicle intraperitoneally (IP), and injected with CCK-8 (40 μg/kg) or saline IP. Fos-LI was then quantified in the DVC and the myenteric neurons of the duodenum and jejunum using a diaminobenzidine reaction. Guanethidine pretreatment attenuated myenteric but not DVC Fos-LI induced by CCK-8. These findings demonstrate that sympathetic neurons play a role in mediating the myenteric Fos-LI response to CCK. They also suggest differential mediation of myenteric and DVC responses to CCK.
Original language | English (US) |
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Pages (from-to) | 119-125 |
Number of pages | 7 |
Journal | Brain research |
Volume | 1064 |
Issue number | 1-2 |
DOIs | |
State | Published - Dec 7 2005 |
Keywords
- Area postrema
- C-Fos
- Chemical sympathectomy
- Cholecystokinin
- Dorsal vagal complex
- Enteric nervous system
- Guanethidine sulfate
- Myenteric plexus
- NTS
- Vagus
ASJC Scopus subject areas
- General Neuroscience
- Molecular Biology
- Clinical Neurology
- Developmental Biology