Corticotropin-releasing factor and systemic capsaicin-sensitive afferents are involved in abdominal surgery-induced Fos expression in the paraventricular nucleus of the hypothalamus

Content Provider	Semantic Scholar
Author	Bonaz, Bruno Taché, Yvette F.
Copyright Year	1997
Abstract	We previously reported that abdominal surgery induces Fos expression in specific hypothalamic and medullary nuclei and also causes gastric stasis. The gastric ileus is reduced by systemic capsaicin and abolished by central injection of corticotropin-releasing factor (CRF) antagonist. We studied the influence of systemic capsaicin and intracerebroventricular (i.c.v.) injection of the CRF antagonist, alpha-helical CRF9-41, on Fos expression in the brain 1 h after abdominal surgery in conscious rats using immunocytochemical detection. In control groups (vehicle s.c. or i.c.v.), abdominal surgery (laparotomy with cecal manipulation) performed under 7-8 min of enflurane anesthesia induced Fos staining in neurons of the spinal trigeminal, C1/A1 group, ventrolateral medulla, central amygdala, parabrachial nucleus, cuneate nucleus, nucleus tractus solitarii (NTS), paraventricular nucleus of the hypothalamus (PVN) and supraoptic nucleus (SON). Capsaicin (125 mg/kg s.c., 2 weeks before) or alpha-helical CRF9-41 (50 microg i.c.v., before surgery) reduced the number of Fos-positive cells by 50% in the PVN while not modifying the number of Fos-labelled cells in the other nuclei. These results indicate that capsaicin-sensitive primary afferents and brain CRF receptors are part of the pathways and biochemical coding through which abdominal surgery activates PVN neurons 1 h post surgery.
Starting Page	12
Ending Page	20
Page Count	9
File Format	PDF HTM / HTML
DOI	10.1016/S0006-8993(96)01281-4
PubMed reference number	9067440
Journal	Medline
Volume Number	748
Alternate Webpage(s)	https://api.elsevier.com/content/article/pii/S0006899396012814
Alternate Webpage(s)	https://www.sciencedirect.com/science/article/pii/S0006899396012814?dgcid=api_sd_search-api-endpoint
Alternate Webpage(s)	https://doi.org/10.1016/S0006-8993%2896%2901281-4
Journal	Brain Research
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article