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J Appl Physiol (1985). 2002 Feb;92(2):863-8.

Molecular genetic studies on sleep-wake regulation, with special emphasis on the prostaglandin D(2) system.

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  • 1Osaka Bioscience Institute, Suita, Osaka 565-0874, Japan.


To elucidate the exact role of the PGD(2) system in sleep-wake regulation in vivo, the sleep behavior of knockout mice, generated in the author's and other laboratories, was examined for lipocalin-type PGD synthase (L-PGDS), PGD receptor, adenosine A(2A) receptor, and histamine H(1) receptor; transgenic mice overexpressing the human L-PGDS gene, generated in the author's laboratory, were also examined. The circadian profiles of sleep patterns of wild-type and the genetically manipulated mice were essentially identical, indicating the possibility that the deficiency of one system may be effectively compensated by some other systems during development. Available evidence indicated that the PGD(2) system is involved in the homeostatic regulation of non-rapid eye movement sleep and that the arousal effect of orexin A is mediated by the histamine H(1) receptor system.

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