Low-intensity pulsed ultrasound induces apoptosis in osteoclasts: Fish scales are a suitable model for the analysis of bone metabolism by ultrasound

• Suzuki, Nobuo

• Hanmoto, Taizo

• Yano, Sachiko

• Furusawa, Yukihiro

• Ikegame, Mika

• Tabuchi, Yoshiaki

• Kondo, Takashi

• Kitamura, Kei-ichiro

• Endo, Masato

• Yamamoto, Toshio

• Sekiguchi, Toshio

• Urata, Makoto

• Mikuni-Takagaki, Yuko

• Hattori, Atsuhiko

抄録

Using fish scales in which osteoclasts and osteoblasts coexist on the calcified bone matrix, we examined the effects of low-intensity pulsed ultrasound (LIPUS) on both osteoclasts and osteoblasts. At 3 h of incubation after LIPUS treatment, osteoclastic markers such as tartrate-resistant acid phosphatase (TRAP) and cathepsin K mRNA expressions decreased significantly while mRNA expressions of osteoblastic markers, osteocalcin, distal-less homeobox 5, runt-related transcription factor 2a, and runt-related transcription factor 2b, increased significantly. At 6 and 18 h of incubation, however, both osteoclastic and osteoblastic marker mRNA expression did not change at least present conditions. Using GeneChip analysis of zebrafish scales treated with LIPUS, we found that cell death-related genes were upregulated with LIPUS treatment. Real-time PCR analysis indicated that the expression of apoptosis-related genes also increased significantly. To confirm the involvement of apoptosis in osteoclasts with LIPUS, osteoclasts were induced by autotransplanting scales in goldfish. Thereafter, the DNA fragmentation associated with apoptosis was detected in osteoclasts using the TUNEL (TdT-mediated dUTP nick end labeling) method. The multi-nuclei of TRAP-stained osteoclasts in the scales were labeled with TUNEL. TUNEL staining showed that the number of apoptotic osteoclasts in goldfish scales was significantly elevated by treatment with LIPUS at 3 h of incubation. Thus, we are the first to demonstrate that LIPUS directly functions to osteoclasts and to conclude that LIPUS directly causes apoptosis in osteoclasts shortly after exposure. © 2016 Elsevier Inc.

Embargo Period 12 months

収録刊行物

• Comparative Biochemistry and Physiology -Part A : Molecular and Integrative Physiology

  Comparative Biochemistry and Physiology -Part A : Molecular and Integrative Physiology 195 26-31, 2016-05-01

  Elsevier

キーワード

• Apoptosis
• Fish scales
• GeneChip analysis
• LIPUS
• Osteoblasts
• Osteoclasts

詳細情報

• CRID: 1050845760917043200
• NII論文ID: 120005743920
• NII書誌ID: AA11183804
• ISSN: 10956433
• Web Site: http://hdl.handle.net/2297/44885
• 本文言語コード: en
• 資料種別: journal article
• データソース種別:
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  • CiNii Articles