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The Journal of Neuroscience, November 3, 2004, 24(44):10013-10021; doi:10.1523/JNEUROSCI.3298-04.2004

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Behavioral/Systems/Cognitive
Endocannabinoids Link Feeding State and Auditory Perception-Related Gene Expression

Ken Soderstrom,¹ Qiyu Tian,¹ Marta Valenti,² and Vincenzo Di Marzo²

¹Department of Pharmacology and Toxicology, Brody School of Medicine, East Carolina University, Greenville, North Carolina 27834, and ²Endocannabinoid Research Group, Istituto di Chimica Biomolecolare, Consiglio Nazionale delle Ricerche, 80078 Pozzuoli, Naples, Italy

Singing by adult male zebra finches is a learned behavior important for courtship, kin recognition, and nest defense (Zann, 1996) and is inhibited by both brief periods of limited food availability and systemic injection of cannabinoids. These similar effects on singing, combined with increasing evidence for endocannabinoid involvement in feeding behavior, led us to evaluate a possible shared mechanism. We found that limited food availability both reduces singing in a cannabinoid antagonist-reversible manner and increases levels of the endocannabinoid 2-arachidonyl glycerol in various brain regions including the caudal telencephalon, an area that contains auditory telencephalon including the L2 subfield of L (L2) and caudal medial nidopallium (NCM). Development and use of an anti-zebra finch cannabinoid receptor type 1 (CB₁) antibody demonstrates distinct, dense cannabinoid receptor expression within song regions including Area X, lMAN (lateral magnocellular nucleus of anterior nidopallium), HVC, RA (robust nucleus of arcopallium), and L2. NCM receives L2 projections and is implicated in integration of auditory information. Activity in this area, determined through expression of the transcription factor ZENK, is increased after exposure to unfamiliar song. Because previous work has shown that these novel song-stimulated increases in NCM activity are mitigated by cannabinoid exposure, we tested and found that similar effects on ZENK expression are produced by limiting food. Limited food-related reductions in the activity of NCM neurons were reversed by the cannabinoid antagonist SR141716A (N-piperidino-5-(4-chlorophenyl)-1-(2,4-dichlorophenyl)-4-methylpyrazole-3-carboxamide), implicating CB₁ cannabinoid receptor involvement. Taken together, these experiments indicate a link between feeding state and gene expression related to auditory perception that is mediated by endocannabinoid signaling.

Key words: cannabinoid; feeding; auditory; CB₁ receptor antibody; songbird; telencephalon

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Received Dec 16, 2003; revised September 23, 2004; accepted September 24, 2004.

This article has been cited by other articles:

				D. Czesnik, D. Schild, J. Kuduz, and I. Manzini Cannabinoid action in the olfactory epithelium PNAS, February 20, 2007; 104(8): 2967 - 2972. [Abstract] [Full Text] [PDF]

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