2007 Fiscal Year Final Research Report Summary
Pharmacological study on bone metabolism by nervous activity
| Project/Area Number |
17591956
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Functional basic dentistry
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| Research Institution | Aichi Gakuin University |
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Principal Investigator |
TOGARI Akifumi Aichi Gakuin University, School of Dentistry Department of Pharmacology, Professor (80126325)
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| Co-Investigator(Kenkyū-buntansha) |
ARAI Michitsugu Aichi-Gakuin University, School of Dentistry Department of Pharmacology, Assistant Professor (20097538)
OBATA Koji Aichi-Gakuin University, School of Dentistry Department of Pharmacology, Assistant Professor (40378229)
HIRUKAWA Koji Aichi-Gakuin University, School of Dentistry Department of Pharmacology, Assistant Professor (60340147)
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| Project Period (FY) |
2005 – 2007
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| Keywords | Osteoblast / Nerve / Co-culture / Calcium ion / Scorpion venom / Synapse |
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| Research Abstract |
The vertebrate skeleton is richly innervated with adrenergic and peptidergic nerve terminals, and these play important roles in bone remodelling. Recently showed that increased sympathetic nervous activity causes bone loss via an increase in bone resorption and a decrease in bone formation. Increased bone resorption is based on the stimulation of both osteoclast formation and osteoclast activity. And we also demonstrated that human osteoblastic as well as osteoclastic cells are equipped with adrenergic receptors (Ars) and neuropeptide receptors and that they constitutively express diffusible axon guidance molecules known to function as a chemoattractant and/or chemorepellent for growing nerve fibers. These findings suggest that the extension of axons of sympathetic and peripheral sensory neurons to osteoblastic and osteoclastic cells is required for the dynamic neural regulation of local bone metabolism. However, while several studies have shown a functional nerve-bone cell interplay,
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whether both osteoblastic and osteoclastic cells activation occurs as a direct response to neuronal activation or requires an intermediary cell is unclear. Therefore, we examined direct nerve-osteoblastic cell communication by using an in vitro co-culture model comprising mouse osteoblastic cells, MC3T3-El, and neurite-spouting mouse superior cervical ganglia. Following loading with the calcium fluorophore Fluo-3, neurite-osteoblastic cell units were examined by confocal laser scanning microscopy. The addition of scorpion venom (SV) elicited neurite activation (i.e., Ca^<2+> mobilization) and, after a lag period, osteoblastic Ca^<2+> mobilization. The SV had no direct effect on the MC3T3-El cells in the absence of neurites. The addition of an α1-AR antagonist, prazosin concentration-dependently prevented the osteoblastic activation that resulted as a consequence of the neural activation by SV. Thus, our recent findings demonstrate that MC3T3-E1 activation, as judge by Ca^<2+> mobilization, can be a direct consequence of contact with a specific activated nerve fiber. This evidence obtained in vitro demonstrates that nerve-osteoblastic cell cross-talk can occur in the absence of an intermediary transducing cell and that noradrenaline is an important mediator of this communication. Several recent in vivo and in vitro studies have demonstrated a sympathomimetic action on bone formation and resorption via osteoblastic and osteoclastic cells, respectively, expressing α-and β-Ars. Less
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[Presentation] 骨芽細胞と神経細胞の共培養実験法の確立と細胞間相互作用の検討.2007
Author(s)
Obata, K., Furuno, T., Nakanishi, M., Togari, A.
Organizer
The 44th Annual Meeting of Japan Tissue Culture Society for Dental Reseach.
Place of Presentation
Matsuyama
Year and Date
2007-12-01
Description
「研究成果報告書概要(欧文)」より
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[Presentation] 共培養実験系における骨芽細胞の機能的相互作用.2007
Author(s)
Obata, K., Kinpara, K., Suga, S., Furuno, T., Nakanishi, M., Goto S., Togari, A.
Organizer
The 111th Kinki Branch Meeting of The Japanese Pharmacological Society.
Place of Presentation
Nagoya
Year and Date
2007-06-15
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Sensory neuropeptide inhibits adrenergic stimulation of osteoclastogenesis in mouse bone marrow cells2005
Author(s)
Togari, A., Hirukawa, K., Kondo, A, Arai, M., Ishizuka, K., Nakamura, H.
Organizer
2nd Joint Meeting of the European Calcified Tissue Society and the International Bone and Mineral Society
Place of Presentation
Geneva,Switzerland
Year and Date
2005-06-27
Description
「研究成果報告書概要(和文)」より
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[Presentation] Sensory neuropeptide inhibits adrenergic stimulation of osteoclastogenesis in mouse bone marrow cells.2005
Author(s)
Togari, A., Hirukawa, K., Kondo, A., Arai, M., Ishizuka, K., Nakamura, H.
Organizer
2nd Joint Meeting of the European Calcified Tissue Society and the International Bone and Mineral Society(Geneva, Switzerland)
Year and Date
2005-06-27
Description
「研究成果報告書概要(欧文)」より
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