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Ghrelin receptor signaling targets segregated clusters of neurons within the nucleus of the solitary tract.

Abstract：

:Ghrelin is a stomach-derived hormone that regulates a variety of biological functions such as food intake, gastrointestinal function and blood glucose metabolism, among others. Ghrelin acts via the growth hormone secretagogue receptor (GHSR), a G-protein-coupled receptor located in key brain areas that mediate specific actions of the hormone. GHSR is highly expressed in the nucleus of the solitary tract (NTS), which is located in the medulla oblongata and controls essential functions, including orofacial, autonomic, neuroendocrine and behavioral responses. Here, we used a mouse model, in which the expression of enhanced green fluorescent protein (eGFP) is controlled by the promoter of GHSR (GHSR-eGFP mice), to gain neuroanatomical and functional insights of the GHSR-expressing neurons of the NTS. We found that GHSR-expressing neurons of the NTS are segregated in clusters that were symmetrically distributed to the midline: (1) a pair of rostral clusters, and (2) a caudal and medially located cluster. We also identified that a subset of GHSR neurons of the caudal NTS are GABAergic. Finally, we found that rostral NTS GHSR neurons increase the levels of the marker of neuronal activation c-Fos in mice exposed to fasting/refeeding or high-fat diet bingeing protocols, while caudal NTS GHSR neurons increase the levels of c-Fos in mice exposed to gastric distension or LiCl-induced malaise protocols. Thus, current data provide evidence that ghrelin receptor signaling seems to target segregated clusters of neurons within the NTS that, in turn, may be activated by different stimuli.

journal_name

Brain Struct Funct

journal_title

Brain structure & function

authors

Cornejo MP,De Francesco PN,García Romero G,Portiansky EL,Zigman JM,Reynaldo M,Perello M

doi

10.1007/s00429-018-1682-5

subject

Has Abstract

pub_date

2018-09-01 00:00:00

pages

3133-3147

issue

7

eissn

1863-2653

issn

1863-2661

pii

10.1007/s00429-018-1682-5

journal_volume

223

pub_type

杂志文章

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