Journal article
Aldosterone‐sensitive neurons in the nucleus of the solitary tract: Efferent projections
Journal of comparative neurology (1911), Vol.497(2), pp.223-250
07/10/2006
DOI: 10.1002/cne.20993
PMID: 16705681
Abstract
The nucleus of the solitary tract (NTS) contains a subpopulation of neurons that express the enzyme 11‐β‐hydroxysteroid dehydrogenase type 2 (HSD2), which makes them uniquely sensitive to aldosterone. These neurons may drive sodium appetite, which is enhanced by aldosterone. Anterograde and retrograde neural tracing techniques were used to reveal the efferent projections of the HSD2 neurons in the rat. First, the anterograde tracer Phaseolus vulgaris leucoagglutinin was used to label axonal projections from the medial NTS. Then, NTS‐innervated brain regions were injected with a retrograde tracer, cholera toxin beta subunit, to determine which sites are innervated by the HSD2 neurons. The HSD2 neurons project mainly to the ventrolateral bed nucleus of the stria terminalis (BSTvl), the pre‐locus coeruleus (pre‐LC), and the inner division of the external lateral parabrachial nucleus (PBel). They also send minor axonal projections to the midbrain ventral tegmental area, lateral and paraventricular hypothalamic nuclei, central nucleus of the amygdala, and periaqueductal gray matter. The HSD2 neurons do not innervate the ventrolateral medulla, a key brainstem autonomic site. Additionally, our tracing experiments confirmed that the BSTvl receives direct axonal projections from the neighboring A2 noradrenergic neurons in the NTS, and from the same pontine sites that receive major inputs from the HSD2 neurons (PBel and pre‐LC). The efferent projections of the HSD2 neurons may provide new insights into the brain circuitry responsible for sodium appetite. J. Comp. Neurol. 497:223–250, 2006. © 2006 Wiley‐Liss, Inc.
Details
- Title: Subtitle
- Aldosterone‐sensitive neurons in the nucleus of the solitary tract: Efferent projections
- Creators
- Joel C GeerlingArthur D Loewy
- Resource Type
- Journal article
- Publication Details
- Journal of comparative neurology (1911), Vol.497(2), pp.223-250
- Publisher
- Wiley Subscription Services, Inc., A Wiley Company; Hoboken
- DOI
- 10.1002/cne.20993
- PMID
- 16705681
- ISSN
- 0021-9967
- eISSN
- 1096-9861
- Number of pages
- 28
- Grant note
- American Heart Association, Predoctoral Fellowship Award (0510050Z) National Institute of Heart, Lung, and Blood of the NIH (HL‐25449)
- Language
- English
- Date published
- 07/10/2006
- Academic Unit
- Neurology; Iowa Neuroscience Institute
- Record Identifier
- 9984013113902771
Metrics
37 Record Views