Colony stimulating factor-1-induced osteoclast spreading depends on substrate and requires the vitronectin receptor and the c-src proto-oncogene

Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research
A TetiK A Hruska

Abstract

The colony stimulating factor 1 (CSF-1) regulates osteoclastogenesis and bone resorption. Mutations in the CSF-1 gene cause an osteopetrosis characterized by the absence of osteoclasts. Mature osteoclasts respond to CSF-1 with inhibition of bone resorption and an increment of cell spreading. Herein we demonstrate that CSF-1-induced osteoclast spreading depends on the substrate the osteoclast interacts with and requires integrity of the vitronectin receptor and of the c-src proto-oncogene. Rabbit osteoclasts were allowed to attach to glass, serum, osteopontin, and bone substrates, and were treated with 10 ng/ml human recombinant CSF-1 for 4 h. In osteoclasts plated on glass, the cytokine induced 70% inhibition of bone resorption and 1.8-fold stimulation of cell spreading, without changes in podosome expression and microfilament array. In contrast, CSF-1 induced a 2.5-fold increase of osteoclasts showing filopodia, and a 9.5-fold increase of osteoclasts presenting lamellipodia, indicating that membrane motility was required for cell spreading. Osteoclasts plated on serum substrates showed a 50% reduction of spontaneous spreading. However, in this circumstance, CSF-1 still stimulated an increase of osteoclast area. In osteoclasts ...Continue Reading

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Dec 17, 2005·Arthritis Research & Therapy·Steven L Teitelbaum
Jan 5, 2000·Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research·A TetiP Bianco
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