Analysis of Ca2+ response of osteocyte network by three-dimensional time-lapse imaging in living bone

Tomoyo Tanaka, Mitsuhiro Hoshijima, Junko Sunaga, Takashi Nishida, Mana Hashimoto, Naoya Odagaki, Ryuta Osumi, Taiji Aadachi, Hiroshi Kamioka

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Osteocytes form a three-dimensional (3D) cellular network within the mineralized bone matrix. The cellular network has important roles in mechanosensation and mechanotransduction related to bone homeostasis. We visualized the embedded osteocyte network in chick calvariae and observed the flow-induced Ca2+ signaling in osteocytes using 3D time-lapse imaging. In response to the flow, intracellular Ca2+ ([Ca2+]i) significantly increased in developmentally mature osteocytes in comparison with young osteocytes in the bone matrix. To investigate the differences in response between young and developmentally mature osteocytes in detail, we evaluated the expression of osteocyte-related genes using the osteocyte-like cell line MLO-Y4, which was 3D-cultured within type I collagen gels. We found that the c-Fos, Cx43, Panx3, Col1a1, and OCN mRNA levels significantly increased on day 15 in comparison with day 7. These findings indicate that developmentally mature osteocytes are more responsive to mechanical stress than young osteocytes and have important functions in bone formation and remodeling.

Original languageEnglish
Pages (from-to)519-528
Number of pages10
JournalJournal of Bone and Mineral Metabolism
Volume36
Issue number5
DOIs
Publication statusPublished - Sep 1 2018

Keywords

  • 3D time-lapse imaging
  • Fluid shear stress
  • MLO-Y4
  • Osteocyte

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Orthopedics and Sports Medicine
  • Endocrinology

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