Barrett, Perry, van den Top, Marco, Wilson, D., Mercer, Julian G., Song, C. K., Bartness, Timothy J., Morgan, Peter J. and Spanswick, David C. (2009) Short photoperiod-induced decrease of histamine H3 receptors facilitates activation of hypothalamic neurons in the Siberian Hamster. Endocrinology, Vol.150 (No.8). pp. 3655-3663. doi:10.1210/en.2008-1620

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Abstract

Nonhibernating seasonal mammals have adapted to temporal changes in food availability through behavioral and physiological mechanisms to store food and energy during times of predictable plenty and conserve energy during predicted shortage. Little is known, however, of the hypothalamic neuronal events that lead to a change in behavior or physiology. Here we show for the first time that a shift from long summer-like to short inter-like photoperiod, which induces physiological adaptation to winter in the Siberian hamster, including a body weight decrease of up to 30%, increases neuronal activity in the dorsomedial region of the arcuate nucleus (dmpARC) assessed by electro physiological patch-clamping recording. Increased neuronal activity in short days is dependent on a photoperiod-driven down-regulation of H3 receptor expression and can be mimicked in long-day dmpARC neurons by the application of the H3 receptor antagonist, clobenproprit. Short-day activation of dmpARC neurons results in increased c-Fos expression. Tract tracing with the trans-synaptic retrograde tracer, pseudorabies virus, delivered into adipose tissue reveals a multisynaptic neuronal sympathetic outflow from dmpARC to white adipose tissue. These data strongly suggest that increased activity of dmpARC neurons, as a consequence of down-regulation of the histamine H3 receptor, contributes to the physiological adaptation of body weight regulation in seasonal photoperiod.

Item Type:	Journal Article
Subjects:	Q Science > QL Zoology Q Science > QP Physiology
Divisions:	Faculty of Medicine > Warwick Medical School > Biomedical Sciences > Translational & Experimental Medicine > Metabolic and Vascular Health (- until July 2016) Faculty of Medicine > Warwick Medical School
Library of Congress Subject Headings (LCSH):	Photoperiodism -- Research, Histamine -- Receptors, Hypothalamus, Body weight -- Regulation, Biological control systems, Hamsters -- Anatomy
Journal or Publication Title:	Endocrinology
Publisher:	The Endocrine Society
ISSN:	0013-7227
Official Date:	August 2009
Dates:	Date Event August 2009 Published
Volume:	Vol.150
Number:	No.8
Page Range:	pp. 3655-3663
DOI:	10.1210/en.2008-1620
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	Biotechnology and Biological Sciences Research Council (Great Britain) (BBSRC), Seventh Framework Programme (European Commission) (FP7), Scotland. Rural and Environment Research and Analysis Directorate (RERAD), Great Britain. National Health Service (NHS)
Grant number:	LSHM-CT-2003-503041 (FP7)

Data sourced from Thomson Reuters' Web of Knowledge

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