Identification of a Novel Planarian G-Protein-Coupled Receptor That Responds to Serotonin in Xenopus laevis Oocytes

Planarians are useful animals for regenerative and neuroscience research at the molecular level. Previously, we have reported the distribution and function of neurotransmitter-synthesizing neurons in the planarian central nervous system. In order to understand the neural projections and connections,...

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Bibliographic Details
Published in:Biological & pharmaceutical bulletin 2009/10/01, Vol.32(10), pp.1672-1677
Main Authors: Nishimura, Kaneyasu, Unemura, Kazuhiro, Tsushima, Jun, Yamauchi, Yosuke, Otomo, Jun, Taniguchi, Takashi, Kaneko, Shuji, Agata, Kiyokazu, Kitamura, Yoshihisa
Format: Article
Language:English
Subjects:
Amino Acid Sequence
Animals
Central Nervous System - cytology
Central Nervous System - metabolism
DNA, Complementary
Dugesia japonica
electrophysiological analysis
Genes, Helminth
In Situ Hybridization
Molecular Sequence Data
Oocytes - metabolism
planarian
Planarians - genetics
Planarians - metabolism
Receptors, G-Protein-Coupled - genetics
Receptors, G-Protein-Coupled - metabolism
Receptors, Serotonin - genetics
Receptors, Serotonin - metabolism
RNA, Messenger - metabolism
Serotonin - metabolism
serotonin receptor
Xenopus laevis
Xenopus laevis - genetics
Xenopus laevis - metabolism
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Summary:Planarians are useful animals for regenerative and neuroscience research at the molecular level. Previously, we have reported the distribution and function of neurotransmitter-synthesizing neurons in the planarian central nervous system. In order to understand the neural projections and connections, it is important to understand the distribution of neurotransmitter receptors. In this study, we isolated a serotonin receptor gene and named it DjSER-7 (Dugesia japonica serotonin receptor type 7). DjSER-7-expressing cells were distributed in the planarian brain. According to electrophysiological analysis using Xenopus oocytes, current response was detected upon exposure to serotonin, but not other neurotransmitters in oocytes that were co-injected with mRNAs of both DjSER-7 and Gα chimera B-2, which can interact with either Gq-, Gs- or Gi-coupled receptor. In contrast, current response was not detected after exposure to neurotransmitters in oocytes injected with only DjSER-7 mRNA. Our results indicated that DjSER-7 responds to serotonin, as indicated by electrophysiological analysis using Xenopus oocytes.
ISSN:0918-6158
1347-5215
DOI:10.1248/bpb.32.1672