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Nakanishi-Kimura A, Takakura A, Hoshi-Numahata M, Watanabe H, Nishiura M, Sato Y, Takao-Kawabata R, Iimura T. Dynamic morphometric changes in the mandibular osteocytic lacunae of ovariectomized rats in response to teriparatide, as revealed by three-dimensional fluorescence analyses: Possible involvement of osteocytic perilacunar remodeling. J Oral Biosci 2024; 66:49-60. [PMID: 38048848 DOI: 10.1016/j.job.2023.11.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2023] [Revised: 11/28/2023] [Accepted: 11/29/2023] [Indexed: 12/06/2023]
Abstract
OBJECTIVES Teriparatide [TPTD; human parathyroid hormone (hPTH1-34)] is an anti-osteoporotic drug with bone anabolic effects. Clinical and preclinical studies have indicated that TPTD has value in oral and maxillofacial bone therapies, including jawbone regeneration, periodontal tissue repair, and the treatment of medication-related osteonecrosis of the jaw. However, it is unclear whether the craniofacial bones respond to TPTD similarly to the axial and appendicular bones. Recent studies showed that TPTD acts on both osteocytes and osteoblasts. This study aimed to characterize distinct craniofacial bone sites, with a focus on morphometric changes in osteocytic lacunae in ovariectomized rats receiving TPTD. METHODS Conventional bone histomorphometric analyses of mandibular and parietal bone sections were conducted. High-resolution confocal imaging-based three-dimensional fluorescence morphometric analyses of osteocytic lacunae in distinct mandibular and parietal bone sites were conducted. RESULTS We observed dynamic changes in the morphometric characteristics of osteocytic lacunae specifically in alveolar and other mandibular bone sites upon TPTD administration. CONCLUSIONS These findings suggest that osteocytes in mandibular bone (specifically, alveolar bone) have unique functional characteristics of osteocytic perilacunar remodeling.
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Affiliation(s)
- Atsuko Nakanishi-Kimura
- Department of Pharmacology, Faculty and Graduate School of Dental Medicine, Hokkaido University, N13 W7, Sapporo 060-8586, Japan; Department of Orthodontics, Faculty and Graduate School of Dental Medicine, Hokkaido University, N13 W7, Sapporo 060-8586, Japan
| | - Aya Takakura
- Pharmaceuticals Research Center, Asahi Kasei Pharma Corporation, 632-1 Mifuku, Izunokuni-shi, Shizuoka 410-2321, Japan.
| | - Marie Hoshi-Numahata
- Department of Pharmacology, Faculty and Graduate School of Dental Medicine, Hokkaido University, N13 W7, Sapporo 060-8586, Japan; Department of Orthodontics, Faculty and Graduate School of Dental Medicine, Hokkaido University, N13 W7, Sapporo 060-8586, Japan
| | - Haruhisa Watanabe
- Department of Pharmacology, Faculty and Graduate School of Dental Medicine, Hokkaido University, N13 W7, Sapporo 060-8586, Japan; Department of Oral Medicine and Diagnostics, Faculty and Graduate School of Dental Medicine, Hokkaido University, N13 W7, Sapporo 060-8586, Japan
| | - Mai Nishiura
- Department of Pharmacology, Faculty and Graduate School of Dental Medicine, Hokkaido University, N13 W7, Sapporo 060-8586, Japan; Department of Dentistry for Children and Disabled Persons, Faculty and Graduate School of Dental Medicine, Hokkaido University, N13 W7, Sapporo 060-8586, Japan
| | - Yoshiaki Sato
- Department of Orthodontics, Faculty and Graduate School of Dental Medicine, Hokkaido University, N13 W7, Sapporo 060-8586, Japan
| | - Ryoko Takao-Kawabata
- Pharmaceuticals Research Center, Asahi Kasei Pharma Corporation, 632-1 Mifuku, Izunokuni-shi, Shizuoka 410-2321, Japan.
| | - Tadahiro Iimura
- Department of Pharmacology, Faculty and Graduate School of Dental Medicine, Hokkaido University, N13 W7, Sapporo 060-8586, Japan.
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Hashimoto M, Takahashi H, Tabata-Okubo K, Nagaoka N, Tokunaga K, Matsumori H, Ishihara Y, Kaku M, Iimura T, Hara T, Kamioka H. Bundling of collagen fibrils influences osteocyte network formation during bone modeling. Sci Rep 2023; 13:22028. [PMID: 38086873 PMCID: PMC10716128 DOI: 10.1038/s41598-023-48786-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2023] [Accepted: 11/30/2023] [Indexed: 12/18/2023] Open
Abstract
Osteocytes form a cellular network by gap junctions between their cell processes. This network is important since intercellular communication via the network is essential for bone metabolism. However, the factors that influence the formation of this osteocyte network remain unknown. As the early stage of osteocyte network formation occurs on the bone surface, we observed a newly formed trabecular bone surface by orthogonal focused ion beam-scanning electron microscopy. The embedding late osteoblast processes tended to avoid bundled collagen fibrils and elongate into sparse collagen fibrils. Then, we examined whether the inhibition of bundling of collagen fibrils using a potent lysyl oxidase inhibitor, β-aminopropionitrile (BAPN) changed the cellular network of the chick calvaria. The osteocyte shape of the control group was spindle-shape, while that of the BAPN group was sphere-shaped. In addition, the osteocyte processes of the control group were elongated vertically to the long axis of the cell body, whereas the osteocyte processes of the BAPN group were elongated radially. Therefore, it was suggested that the bundling of collagen fibrils influences normal osteocyte network formation during bone modeling.
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Affiliation(s)
- Mana Hashimoto
- Department of Orthodontics, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, 2-5-1, Shikata-cho, Kita-Ku, Okayama, Okayama, 700-8525, Japan
| | - Haruka Takahashi
- Department of Orthodontics, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, 2-5-1, Shikata-cho, Kita-Ku, Okayama, Okayama, 700-8525, Japan
| | - Kaori Tabata-Okubo
- Department of Orthodontics, Okayama University Hospital, 2-5-1, Shikata-cho, Kita-Ku, Okayama, Okayama, 700-8525, Japan
| | - Noriyuki Nagaoka
- Advanced Research Center for Oral and Craniofacial Sciences, Okayama University Dental School, 2-5-1, Shikata-cho, Kita-Ku, Okayama, Okayama, 700-8525, Japan
| | - Kazuaki Tokunaga
- Nikon Corporation, 2-15-3 Konan, Minato-Ku, Tokyo, 108-6290, Japan
| | - Haruka Matsumori
- Nikon Corporation, 2-15-3 Konan, Minato-Ku, Tokyo, 108-6290, Japan
| | - Yoshihito Ishihara
- Department of Orthodontics, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, 2-5-1, Shikata-cho, Kita-Ku, Okayama, Okayama, 700-8525, Japan
| | - Masaru Kaku
- Division of Bio-prosthodontics, Faculty of Dentistry and Graduate School of Medical and Dental Sciences, Niigata University, 2-5274 Gakkocho-dori, Chuo-Ku, Niigata, Niigata, 951-8514, Japan
| | - Tadahiro Iimura
- Department of Pharmacology, Faculty and Graduate School of Dental Medicine, Hokkaido University, N13 W7, Kita-Ku, Sapporo, Hokkaido, 060-8586, Japan
| | - Toru Hara
- Research Center for Structural Materials, National Institute for Materials Science, 1-2-1, Sengen, Tsukuba, Ibaraki, 305-0047, Japan
| | - Hiroshi Kamioka
- Department of Orthodontics, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, 2-5-1, Shikata-cho, Kita-Ku, Okayama, Okayama, 700-8525, Japan.
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