Document Detail

Specializations of gastrin-releasing peptide cells of the mouse suprachiasmatic nucleus.
MedLine Citation:
PMID:  20151358     Owner:  NLM     Status:  MEDLINE    
The suprachiasmatic nucleus (SCN) of the hypothalamus regulates daily rhythms in physiology and behavior. It is composed of a heterogeneous population of cells that together form the circuits underlying its master clock function. Numerous studies suggest the existence of two regions that have been termed core and shell. At a gross level, differences between these regions map to distinct functional differences, although the specific role(s) of various peptidergic cellular phenotypes remains unknown. In mouse, gastrin-releasing peptide (GRP) cells lie in the core, are directly retinorecipient, and lack detectable rhythmicity in clock gene expression, raising interest in their role in the SCN. Here, we provide evidence that calbindin-expressing cells of perinatal mouse SCN express GRP, identified by a green fluorescent protein (GFP+), but lack detectable calbindin later in development. To explore the intra-SCN network in which GRP neurons participate, individual GFP+ cells were filled with tracer and their morphological characteristics, processes, and connections, as well as those of their non-GFP-containing immediate neighbors, were compared. The results show that GFP+ neurons form a dense network of local circuits within the core, revealed by appositions on other GFP+ cells and by the presence of dye-coupled cells. Dendrites and axons of GFP+ cells make appositions on arginine vasopressin neurons, whereas non-GFP cells have a less extensive fiber network, largely confined to the region of GFP+ cells. The results point to specialized circuitry within the SCN, presumably supporting synchronization of neural activity and reciprocal communication between core and shell regions.
Elise Drouyer; Joseph LeSauter; Amanda L Hernandez; Rae Silver
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  The Journal of comparative neurology     Volume:  518     ISSN:  1096-9861     ISO Abbreviation:  J. Comp. Neurol.     Publication Date:  2010 Apr 
Date Detail:
Created Date:  2010-02-22     Completed Date:  2010-06-01     Revised Date:  2014-09-20    
Medline Journal Info:
Nlm Unique ID:  0406041     Medline TA:  J Comp Neurol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1249-63     Citation Subset:  IM    
Copyright Information:
(c) 2009 Wiley-Liss, Inc.
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MeSH Terms
Animals, Newborn
Arginine Vasopressin / metabolism
Axons / physiology
Dendrites / physiology
Dendritic Spines / physiology
Gastrin-Releasing Peptide / metabolism*
Green Fluorescent Proteins / genetics,  metabolism
Mice, Transgenic
Neural Pathways / cytology,  growth & development,  physiology
Neurons / cytology,  physiology*
S100 Calcium Binding Protein G / metabolism
Suprachiasmatic Nucleus / cytology,  growth & development*,  physiology*
Synapses / physiology
Grant Support
Reg. No./Substance:
0/Calbindins; 0/S100 Calcium Binding Protein G; 0/enhanced green fluorescent protein; 113-79-1/Arginine Vasopressin; 147336-22-9/Green Fluorescent Proteins; 80043-53-4/Gastrin-Releasing Peptide

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