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Titolo:
CYTOARCHITECTONIC ANALYSIS OF FOS-IMMUNOREACTIVITY IN BRAIN-STEM NEURONS FOLLOWING VISCERAL STIMULI IN CONSCIOUS RATS
Autore:
MAYNE RG; ARMSTRONG WE; CROWLEY WR; BEALER SL;
Indirizzi:
UNIV TENNESSEE,CTR HLTH SCI,DEPT ANAT & NEUROBIOL,855 MONROE AVE MEMPHIS TN 38163 UNIV TENNESSEE,CTR HLTH SCI,DEPT ANAT & NEUROBIOL MEMPHIS TN 38163 UNIV TENNESSEE,CTR HLTH SCI,DEPT PHARMACOL MEMPHIS TN 38163 UNIV TENNESSEE,CTR HLTH SCI,DEPT PHYSIOL & BIOPHYS MEMPHIS TN 38163
Titolo Testata:
Journal of neuroendocrinology
fascicolo: 11, volume: 10, anno: 1998,
pagine: 839 - 847
SICI:
0953-8194(1998)10:11<839:CAOFIB>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
NUCLEUS-TRACTUS-SOLITARII; PARABRACHIAL NUCLEUS; C-FOS; STEM PROJECTIONS; BARORECEPTOR STIMULATION; VENTROLATERAL MEDULLA; SUPRAOPTIC NUCLEUS; ARTERIAL-PRESSURE; VAGUS NERVE; CHOLECYSTOKININ;
Keywords:
NUCLEUS OF THE SOLITARY TRACT; VENTROLATERAL MEDULLA; PARABRACHIAL NUCLEUS; PHENYLEPHRINE; CHOLECYSTOKININ;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
41
Recensione:
Indirizzi per estratti:
Citazione:
R.G. Mayne et al., "CYTOARCHITECTONIC ANALYSIS OF FOS-IMMUNOREACTIVITY IN BRAIN-STEM NEURONS FOLLOWING VISCERAL STIMULI IN CONSCIOUS RATS", Journal of neuroendocrinology, 10(11), 1998, pp. 839-847

Abstract

Visceral inputs to the brain make their initial synapses within the nucleus of the solitary tract (NTS), where information is relayed to other brain regions. These inputs relate to markedly different physiological functions and provide a tool for investigating the topography of visceral processing in brainstem nuclei. Therefore, Fos immunoreactivity was used to determine whether a gastric stimulus affects neurones within different or similar parts of the NTS, ventrolateral medulla (VLM) and parabrachial nucleus (PBN), compared to a baroreceptive stimulus. The contribution of catecholaminergic neurones in these areas was studied by combining Fos and tyrosine hydroxylase (TH) immunoreactivity, Conscious male rats received either cholecystokinin (CCK) intraperitoneally to activate gastrointestinal afferents, or were made hypertensive by intravenous infusion of phenylephrine (PE) to activate baroreceptors, Tissue sections were processed immunocytochemically for Fos and/or TH, Phenylephrine infusion and CCK injection elicited Fos expression in distinct and in overlapping regions of the NTS and the VLM. Cholecystokinin injections increased the number of Fos-immunoreactive neurones in the area postrema (AP) and throughout the rostral-caudal extent of the NTS, including commissural neurones and the medial subnuclei. Some reactive neurones in NTS were also positive for TH, but most were not, and most of the TH-positive NTS neurones were not Fos-positive,In contrast, PE infusion produced a more restricted distribution of Fos-positive neurones in the NTS, with most neurones confined to a dorsolateral strip containing few TH-positive neurones. The medial NTS at the level of the AP and the AP itself were largely unresponsive, but rostral to the AP the medial NTS was labelled, including some TH-positive neurones. Both treatments produced labelling in the caudal and mid-VLM, but PE infusion had a stronger effect in the rostral VLM. In the PBN, CCK elevated Fos expression in several subregions, whereas PE infusion failed to specifically alter any subdivision. The results suggest that stimulation of baroreceptor and gastric afferents evoke both overlapping and cytoarchitectonically distinct pathways in the brainstem.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/09/20 alle ore 11:34:47