Osteoclast differentiation and function in aquaglyceroporin AQP9-null mice.

Published

Journal Article

BACKGROUND INFORMATION: Osteoclasts are cells specialized for bone resorption and play important roles in bone growth and calcium homoeostasis. Differentiation of osteoclasts involves fusion of bone marrow macrophage mononuclear precursors in response to extracellular signals. A dramatic increase in osteoclast cell volume occurs during osteoclast biogenesis and is believed to be mediated by AQP9 (aquaporin 9), a membrane protein that can rapidly transport water and other small neutral solutes across cell membranes. RESULTS: In the present study we report an increase in expression of AQP9 during differentiation of a mouse macrophage cell line into osteoclasts. Bone marrow macrophages from wild-type and AQP9-null mice differentiate into osteoclasts that have similar morphology, contain comparable numbers of nuclei, and digest synthetic bone to the same extent. Bones from wild-type and AQP9-null mice contain similar numbers of osteoclasts and have comparable density and structure as measured by X-ray absorptiometry and microcomputed tomography. CONCLUSIONS: Our results confirm that AQP9 expression rises during osteoclast biogenesis, but indicate that AQP9 is not essential for osteoclast function or differentiation under normal physiological conditions.

Full Text

Duke Authors

Cited Authors

  • Liu, Y; Song, L; Wang, Y; Rojek, A; Nielsen, S; Agre, P; Carbrey, JM

Published Date

  • March 2009

Published In

Volume / Issue

  • 101 / 3

Start / End Page

  • 133 - 140

PubMed ID

  • 18666888

Pubmed Central ID

  • 18666888

Electronic International Standard Serial Number (EISSN)

  • 1768-322X

Digital Object Identifier (DOI)

  • 10.1042/BC20080083

Language

  • eng

Conference Location

  • England