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Adseverin is an actin-severing/capping protein that may contribute to osteoclast differentiation in vitro but its role in bone remodeling of healthy animals is not defined. We analyzed bone and osteoclast structure in adseverin conditional null mice at alveolar and long bone sites. In wild-type and adseverin null mice, as measured by dual-energy X-ray absorptiometry, there were no differences of bone mineral content or bone mineral density, indicating no change of bone metabolism. In tibiae, TRAcP+ osteoclasts were formed in comparable numbers in adseverin null and wild-type mice. Ultrastructural analysis showed normal and similar abundance of ruffled borders, sealing zones, and mitochondria, and with no difference of osteoclast nuclear numbers. In contrast, analyses of long bone showed that in the absence of adseverin osteoclasts were smaller (120 ± 13 vs. 274 ± 19 µm2; p < 0.05), as were nuclear size and the surface area of cytoplasm. The nuclei of adseverin null osteoclasts exhibited more heterochromatin (31 ± 3%) than wild-type cells (8 ± 1%), suggesting that adseverin affects cell differentiation. The data indicate that in healthy, developing tissues, adseverin contributes to the regulation of osteoclast structure but not to bone metabolism in vivo.

Original publication

DOI

10.1007/s00223-017-0271-6

Type

Journal article

Journal

Calcified tissue international

Publication Date

08/2017

Volume

101

Pages

207 - 216

Addresses

Department of Oral Cell Biology and Functional Anatomy, Academic Centre for Dentistry Amsterdam (ACTA), Research Institute MOVE, University of Amsterdam and VU University Amsterdam, 11N-43, Gustav Mahlerlaan 3004, 1081 LA, Amsterdam, The Netherlands. y.cao@acta.nl.

Keywords

Bone and Bones, Osteoclasts, Animals, Mice, Inbred C57BL, Mice, Knockout, Bone Resorption, Microfilament Proteins, Gelsolin, Absorptiometry, Photon, Cell Differentiation, Bone Density