Receptors and transporter for serotonin in Merkel cell-nerve endings in the rat sinus hair follicle. An immunohistochemical study
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- Tachibana Tamiko
- Department of Oral Anatomy, Iwate Medical University School of Dentistry
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- Endoh Makoto
- Department of Oral Anatomy, Iwate Medical University School of Dentistry
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- Fujiwara Naoki
- Department of Oral Anatomy, Iwate Medical University School of Dentistry
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- Nawa Tokio
- Department of Oral Anatomy, Iwate Medical University School of Dentistry
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Serotonin (5-HT) has been a candidate for neurotransmitters in cutaneous type I mechanoreceptors (i.e., Merkel cell-nerve endings). Although recent electrophysiological studies have suggested the presence of the 5-HT2 and 3 receptors in the Merkel cell-nerve endings, the histological localization of these receptors are obscure. We thus immunohistochemically examined the presence of 5-HT1, 2, 3 receptors in Merkel cell-nerve endings in sinus hair follicles of the rat whisker pad. We also studied the immunohistochemical localization of the 5-HT transporter to confirm the site of 5-HT secretion. For this purpose, we used antibodies for the 5-HT1A, 5-HT1B, 5-HT2A, 5-HT2C and 5-HT3 receptors, and for the 5-HT transporter, as well as antibodies for cytokeratin 20 (as a marker of Merkel cells) and neurofilament H (a marker of type I sensory nerve terminals). The immuno-stained sections were analyzed under a laser-scanning microscope. It was found that the sensory nerve terminals in the Merkel cell-nerve endings showed strong positive immunoreactions of 5-HT1A and 1B receptors but not 5-HT2A, 2C, and 3 receptors. Furthermore, both the Merkel cells and related axon terminals showed strong immunoreactions of the 5-HT transporter. These findings support the idea that 5-HT molecules are released from the Merkel cells during mechanical reception and indirectly regulate neural actions of sensory neurons via 5-HT1 receptors. The localization of the 5-HT transporter found in this study also suggests a possibility that axon terminals in the Merkel cell-nerve endings also release 5-HT.
収録刊行物
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- Archives of Histology and Cytology
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Archives of Histology and Cytology 68 (1), 19-28, 2005
国際組織細胞学会
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詳細情報 詳細情報について
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- CRID
- 1390282681389177216
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- NII論文ID
- 130004462634
- 10015564874
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- NII書誌ID
- AA1068990X
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- ISSN
- 13491717
- 09149465
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- PubMed
- 15827375
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- 本文言語コード
- en
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- データソース種別
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- JaLC
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- PubMed
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- 使用不可