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Lack of ADAM15 in mice is associated with increased osteoblast function and bone mass

Lack of ADAM15 in mice is associated with increased osteoblast function and bone mass Abstract The ADAMs (a disintegrin and metalloprotease) contribute to various biological functions including the development of tissues by taking part in cell-cell and cell-matrix interactions. We previously found that ADAM15 is prominently expressed in osteoblasts and to a lesser extent in osteoclasts. The aim of this study was to investigate a possible function of ADAM15 in bone. Adult ADAM15 -/- mice displayed an increase in bone volume and thickness with an increase in the number and activity of osteoblasts, whereas osteoclasts were apparently unaffected. We found an increase in proliferation, alkaline phosphatase (ALP) staining and nodule deposition, and mineralization in cultures of ADAM15 -/- osteoblasts compared to wild-type osteoblasts. We also observed an increase in β-catenin immunoreactivity in the nucleus of ADAM15 -/- osteoblasts compared to wild-type, whereas β-catenin in the membrane/cytoplasm compartment appeared to undergo increased degradation. Furthermore, cyclin D1 and c-Jun, known downstream targets of β-catenin and effectors of cell activation, were found up-regulated in absence of ADAM15. This study indicates that ADAM15 is required for normal skeletal homeostasis and that its absence causes increased nuclear translocation of β-catenin in osteoblasts leading to increased osteoblast proliferation and function, which results in higher trabecular and cortical bone mass. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Biological Chemistry de Gruyter

Lack of ADAM15 in mice is associated with increased osteoblast function and bone mass

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References (34)

Publisher
de Gruyter
Copyright
Copyright © 2011 by the
Subject
CELL BIOLOGY AND SIGNALING
ISSN
1431-6730
eISSN
1437-4315
DOI
10.1515/BC.2011.080
pmid
21801086
Publisher site
See Article on Publisher Site

Abstract

Abstract The ADAMs (a disintegrin and metalloprotease) contribute to various biological functions including the development of tissues by taking part in cell-cell and cell-matrix interactions. We previously found that ADAM15 is prominently expressed in osteoblasts and to a lesser extent in osteoclasts. The aim of this study was to investigate a possible function of ADAM15 in bone. Adult ADAM15 -/- mice displayed an increase in bone volume and thickness with an increase in the number and activity of osteoblasts, whereas osteoclasts were apparently unaffected. We found an increase in proliferation, alkaline phosphatase (ALP) staining and nodule deposition, and mineralization in cultures of ADAM15 -/- osteoblasts compared to wild-type osteoblasts. We also observed an increase in β-catenin immunoreactivity in the nucleus of ADAM15 -/- osteoblasts compared to wild-type, whereas β-catenin in the membrane/cytoplasm compartment appeared to undergo increased degradation. Furthermore, cyclin D1 and c-Jun, known downstream targets of β-catenin and effectors of cell activation, were found up-regulated in absence of ADAM15. This study indicates that ADAM15 is required for normal skeletal homeostasis and that its absence causes increased nuclear translocation of β-catenin in osteoblasts leading to increased osteoblast proliferation and function, which results in higher trabecular and cortical bone mass.

Journal

Biological Chemistry – de Gruyter

Published: Oct 1, 2011

Keywords: ADAM15; β-catenin; disintegrin; metalloprotease; osteoblast; skeletal homeostasis

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