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The Journal of Neuroscience, July 5, 2006, 26(27):7245-7256; doi:10.1523/JNEUROSCI.5426-05.2006

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Behavioral/Systems/Cognitive
Histamine and Its Receptors Modulate Temperature-Preference Behaviors in Drosophila

Sung-Tae Hong, Sunhoe Bang, Donggi Paik, Jongkyun Kang, Seungyoon Hwang, Keunhye Jeon, Bumkoo Chun, Seogang Hyun, Youngseok Lee, and Jaeseob Kim

Department of Biological Sciences, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea

Correspondence should be addressed to Dr. Jaeseob Kim, Department of Biological Sciences, Korea Advanced Institute of Science and Technology, 373-1 Guseong-dong, Yuseong, Daejeon 305-701, Korea (South). Email: kjaeseob{at}kaist.ac.kr

Temperature profoundly influences various life phenomena, and most animals have developed mechanisms to respond properly to environmental temperature fluctuations. To identify genes involved in sensing ambient temperature and in responding to its change, >27,000 independent P-element insertion mutants of Drosophila were screened. As a result, we found that defects in the genes encoding for proteins involved in histamine signaling [histidine decarboxylase (hdc), histamine-gated chloride channel subunit 1 (hisCl1), ora transientless (ort)] cause abnormal temperature preferences. The abnormal preferences shown in these mutants were restored by genetic and pharmacological rescue and could be reproduced in wild type using the histamine receptor inhibitors cimetidine and hydroxyzine. Spatial expression of these genes was observed in various brain regions including pars intercerebralis, fan-shaped body, and circadian clock neurons but not in dTRPA1-expressing neurons, an essential element for thermotaxis. We also found that the histaminergic mutants showed reduced tolerance for high temperature and enhanced tolerance for cold temperature. Together, these results suggest that histamine signaling may have important roles in modulating temperature preference and in controlling tolerance of low and high temperature.

Key words: histamine; hisCl1; ort; Drosophila; temperature; preference

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Received Dec. 20, 2005; revised May 26, 2006; accepted May 26, 2006.

Correspondence should be addressed to Dr. Jaeseob Kim, Department of Biological Sciences, Korea Advanced Institute of Science and Technology, 373-1 Guseong-dong, Yuseong, Daejeon 305-701, Korea (South). Email: kjaeseob{at}kaist.ac.kr

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