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[Abstract Title]. - Society for Neuroscience

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Disclosures: M. Job, None; R.A. Gonzales, None.<br />

Poster<br />

257. Alcohol Intake and Preference<br />

Time: Sunday, November 16, 2008, 1:00 pm - 5:00 pm<br />

Program#/Poster#: 257.19/AA2<br />

Topic: C.16.a. Alcohol<br />

Support: Academy of Finland grant<br />

Finnish Foundation <strong>for</strong> Alcohol Studies grant<br />

<strong>Title</strong>: Histamine H3 receptor confers alcohol intake in rodents<br />

Authors: *P. PANULA 1 , P. HYYTIÄ 2 , K. KARLSTEDT 1 , J. KASLIN 1 , K. KIIANMAA 2 , M.<br />

LINTUNEN 1,3 ;<br />

1 Neurosci. Ctr., Univ. of Helsinki, Helsinki, Finland; 2 Dept. of Mental Hlth. and Alcohol Res.,<br />

Natl. Publ. Hlth. Inst., Helsinki, Finland; 3 Dept. of Biol., Abo Akademi Univ., Turku, Finland<br />

<strong>Abstract</strong>: Mechanisms of alcohol addiction and intake in animal models have been difficult to<br />

assess, due to obvious involvement of several different neuronal systems and transmitters.<br />

Previous studies have shown that brain histamine levels in alcohol-preferring AA rats are high<br />

compared to alcohol non-preferring ANA rats, and alcohol self-administration of AA rats is<br />

bidirectionally regulated by histamine H3 receptor ligands. Here we show using HPLC, that the<br />

production of histamine in the brains of alcohol-preferring AA rats is enhanced, and the<br />

expression of H3 receptor iso<strong>for</strong>ms studied with quantitative in situ hybridization differs from<br />

that of an alcohol non-preferring ANA strain. Lowering the brain histamine in AA rats did not<br />

affect operant alcohol intake, suggesting that H3 receptor is more important than histamine<br />

through effects on other receptors <strong>for</strong> this behaviour. Mice lacking H3 receptor showed low<br />

alcohol preference ratios in a two-bottle choice test compared to control mice. No difference in<br />

alcohol preference ratio was observed between control animals and those lacking endogenous<br />

histamine (histidine decarboxylase KO animals). The results suggest that histamine H3 receptor<br />

is important in regulation of alcohol intake.<br />

Disclosures: P. Panula, Johnson & Johnson Pharmaceutical Research & Development, L.L.C.<br />

(San Diego, CA, U.S.A.) donated the H3R KO mice, C. Other Research Support (receipt of<br />

drugs, supplies, equipment or other in-kind support); P. Hyytiä, None; K. Karlstedt, None; J.<br />

Kaslin, None; K. Kiianmaa, None; M. Lintunen, None.

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