Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/124441
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Type: Journal article
Title: Functional and neurochemical characterization of angiotensin type 1A receptor-expressing neurons in the nucleus of the solitary tract of the mouse
Author: Carter, D.
Choong, Y.
Connelly, A.
Bassi, J.
Hunter, N.
Thongsepee, N.
Llewellyn-Smith, I.
Fong, A.
McDougall, S.
Allen, A.
Citation: American Journal of Physiology - Regulatory Integrative and Comparative Physiology, 2017; 313(4):R438-R449
Publisher: American Physiological Society
Issue Date: 2017
ISSN: 0363-6119
1522-1490
Statement of
Responsibility: 
D. A. Carter, Y.-T. Choong, A. A. Connelly, J. K. Bassi, N. O. Hunter, N. Thongsepee, X I. J. Llewellyn-Smith, A. Y. Fong, S. J. McDougall and X A. M. Allen
Abstract: Angiotensin II acts via two main receptors within the central nervous system, with the type 1A receptor (AT1AR) most widely expressed in adult neurons. Activation of the AT1R in the nucleus of the solitary tract (NTS), the principal nucleus receiving central synapses of viscerosensory afferents, modulates cardiovascular reflexes. Expression of the AT1R occurs in high density within the NTS of most mammals, including humans, but the fundamental electrophysiological and neurochemical characteristics of the AT1AR-expressing NTS neurons are not known. To address this, we have used a transgenic mouse, in which the AT1AR promoter drives expression of green fluorescent protein (GFP). Approximately one-third of AT1AR-expressing neurons express the catecholamine-synthetic enzyme tyrosine hydroxylase (TH), and a subpopulation of these stained for the transcription factor paired-like homeobox 2b (Phox2b). A third group, comprising approximately two-thirds of the AT1AR-expressing NTS neurons, showed Phox2b immunoreactivity alone. A fourth group in the ventral subnucleus expressed neither TH nor Phox2b. In whole cell recordings from slices in vitro, AT1AR-GFP neurons exhibited voltage-activated potassium currents, including the transient outward current and the M-type potassium current. In two different mouse strains, both AT1AR-GFP neurons and TH-GFP neurons showed similar AT1AR-mediated depolarizing responses to superfusion with angiotensin II. These data provide a comprehensive description of AT1AR-expressing neurons in the NTS and increase our understanding of the complex actions of this neuropeptide in the modulation of viscerosensory processing.
Keywords: Solitary Nucleus
Rights: © 2017 the American Physiological Society.
RMID: 1000013648
DOI: 10.1152/ajpregu.00168.2017
Grant ID: http://purl.org/au-research/grants/nhmrc/1007451
http://purl.org/au-research/grants/nhmrc/1029396
http://purl.org/au-research/grants/nhmrc/1120477
http://purl.org/au-research/grants/arc/DP1094301
Appears in Collections:Medicine publications

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