Int J Oral Biol.
2017 Dec;42(4):169-174. 10.11620/IJOB.2017.42.4.169.
Distribution of Cold Receptor Transient Receptor Potential Melastatin 8-Immunopositive Axons in the Mouse Dental Pulp and Periodontal Tissue
- Affiliations
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- 1Department of Dental Hygiene, Taegu Science University, Daegu 41453, Korea.
- 2Department of Pediatric Dentistry, School of Dentistry, Kyungpook National University, Daegu 41940, Korea.
- 3Department of Anatomy and Neurobiology, School of Dentistry, Kyungpook National University, Daegu 41940, Korea. ycbae@knu.ac.kr
- KMID: 2404841
- DOI: http://doi.org/10.11620/IJOB.2017.42.4.169
Abstract
- Transient receptor potential melastatin 8 (TRPM8) plays a crucial role in innocuous cool sensation, acute cold pain and cold-induced hyperalgesia during pathologic conditions. To help understand TRPM8-mediated cold perception in the dental pulp and periodontal tissues, we examined the distribution of TRPM8-immunopositive (+) axons in molar and incisor pulp and periodontal tissues using transgenic mice expressing a genetically encoded axonal tracer in TRPM8+ neurons. In the radicular pulp of the molar teeth, a small number of TRPM8+ axons were observed. TRPM8+ axons branched frequently and extensively in the core of coronal pulp, forming a network in the peripheral pulp. Some TRPM8+ axons ascended between odontoblasts and were observed in the dentinal tubule. TRPM8+ axons were linear-shaped in the radicular pulp, whereas many TRPM8+ axons showed portions shaped like beads connected with thin axonal stands at the peripheral pulp. TRPM8 was densely expressed in the bead portions. In the incisor pulp, TRPM8+ axons were occasionally observed in the core of the coronal pulp and rarely observed at the peripheral pulp. TRPM8+ axons were occasionally observed and showed a linear shape rather than a bead-like appearance in the periodontal ligament and lamina propria of the gingival tissue. These findings, showing differential distribution of TRPM8+ axons between radicular and coronal portions of the molar pulp, between incisor and molar pulp, and between dental pulp and periodontal tissues, may reflect differential cold sensitivity in these regions.
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