Galanin injection into the nucleus of the solitary tract stimulates feeding in rats with lesions of the paraventricular nucleus of the hypothalamus

Physiology & Behavior
F H Koegler, S Ritter

Abstract

Feeding can be stimulated by injection of galanin into the area postrema/nucleus of the solitary tract (AP/NTS) or fourth ventricle (4V). However, the threshold for galanin-induced feeding is lower when galanin is injected into the paraventricular nucleus of the hypothalamus (PVN) than when injected into the NTS. The greater apparent sensitivity of the PVN to galanin and the proximity of this nucleus to the third ventricle raise the possibility that galanin injected into the AP/NTS or 4V may stimulate feeding by accessing receptors in the PVN rather than by a local action in the hindbrain. To assess this possibility, feeding in response to NTS galanin was evaluated in rats with bilateral electrolytic lesions of the PVN. We found that PVN lesions did not abolish feeding induced by injections of galanin into the NTS. Rather, galanin-induced feeding, but not mercaptoacetate- or 2-deoxy-D-glucose-induced feeding, was significantly enhanced in PVN-lesioned rats compared to sham-operated controls. These results suggest that galanin receptors in the NTS region mediate feeding in response to galanin and that the galaninergic nerve terminals innervating these receptors may originate in part from cell bodies in the PVN.

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Citations

Jun 20, 2007·International Journal of Colorectal Disease·Amosy E M'KomaAlan J Herline
May 10, 2005·Physiology & Behavior·Gabriele V RonnettYajun Tu
Dec 26, 2001·Neuropharmacology·M OdorizziA Burlet
Apr 24, 2001·Pharmacology & Therapeutics·J C ClaphamM Tadayyon
Feb 20, 2003·Trends in Endocrinology and Metabolism : TEM·Simon M Luckman, Catherine B Lawrence
Feb 9, 2007·Archives of Histology and Cytology·Yuji SetaKuniaki Toyoshima
Mar 22, 2014·Physiology & Behavior·Guillaume de Lartigue
Jan 26, 2013·Seminars in Cell & Developmental Biology·Cedrick D DotsonSteven D Munger
May 15, 2010·Neuropeptides·K Izdebska, J Ciosek
Feb 15, 2011·Experimental Physiology·Charles C T HindmarchDavid Murphy
Mar 16, 2004·The European Journal of Neuroscience·Craige C WrennJacqueline N Crawley
Feb 25, 2015·Nature Reviews. Endocrinology·Sara Santa-Cruz Calvo, Josephine M Egan
May 30, 2015·Nutrition Reviews·Hillary B LoperNanette Steinle
Apr 19, 2002·The Journal of Pharmacology and Experimental Therapeutics·Chun-Su YuanHan H Aung
Dec 26, 2003·Journal of Neurophysiology·Zhenjun TanXueguo Zhang
Jan 23, 2016·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Ai-Jun LiSue Ritter
Mar 1, 2012·Neuropharmacology·Jennifer A Parker, Stephen R Bloom

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