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Endocrinology Vol. 142, No. 4 1678
Copyright © 2001 by The Endocrine Society

ARTICLES

Cytokine-Activated Endothelium Recruits Osteoclast Precursors

Neil W. A. McGowan, Emily J. Walker, Heather Macpherson, Stuart H. Ralston and Miep H. Helfrich

Department of Medicine and Therapeutics, University of Aberdeen Medical School, Foresterhill, Aberdeen, AB25 2ZD, United Kingdom

Address all correspondence and requests for reprints to: Miep H. Helfrich, University of Aberdeen Medical School, Polwarth Building, Department of Medicine and Therapeutics, Fosterhill AB25 2ZD, United Kingdom.


   Abstract
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 Abstract
Introduction
 
Osteoclast precursors reach sites of osteoclast formation and remodelling via the vasculature and are therefore destined to encounter endothelium before migrating to the bone surface. Here we investigated the hypothesis that endothelium may be involved in the regulation of osteoclast precursor recruitment to sites of bone resorption. Osteoclast precursors in human peripheral blood were identified by their ability to form mature osteoclasts in 21-day cultures supplemented with RANKLigand, M-CSF, 1,25(OH)2-vitamin D3, dexamethasone and prostaglandin E2. Under control conditions few osteoclast precursors adhered to endothelial cells (the human bone marrow-derived endothelial cell line BMEC-1). However, BMEC-1 cells treated with the resorption stimulating cytokines IL-1ß and TNF{alpha} depleted the PBMC population of all osteoclast precursors. These results provide the first evidence that osteoclast precursors can adhere to endothelium and suggest that endothelium could play an important role in the recruitment of osteoclast precursors to sites of bone resorption.


   Introduction
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 Abstract
 Introduction
 

Received December 11, 2001.




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This Article
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