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CD44 and beta3 integrin organize two functionally distinct actin-based domains in osteoclasts

Chabadel, Anne
Bañon-Rodríguez, Inmaculada
Cluet, David
Rudkin, Brian B
Genot, Elisabeth
Jurdic, Pierre
Anton, Ines M
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Published in Molecular Biology of the Cell. 2007, vol. 18, no. 12, p. 4899-910
Abstract The actin cytoskeleton of mature osteoclasts (OCs) adhering to nonmineralized substrates is organized in a belt of podosomes reminiscent of the sealing zone (SZ) found in bone resorbing OCs. In this study, we demonstrate that the belt is composed of two functionally different actin-based domains: podosome cores linked with CD44, which are involved in cell adhesion, and a diffuse cloud associated with beta3 integrin, which is involved in cell adhesion and contraction. Wiskott Aldrich Syndrome Protein (WASp) Interacting Protein (WIP)-/- OCs were devoid of podosomes, but they still exhibited actin clouds. Indeed, WIP-/- OCs show diminished expression of WASp, which is required for podosome formation. CD44 is a novel marker of OC podosome cores and the first nonintegrin receptor detected in these structures. The importance of CD44 is revealed by showing that its clustering restores podosome cores and WASp expression in WIP-/- OCs. However, although CD44 signals are sufficient to form a SZ, the presence of WIP is indispensable for the formation of a fully functional SZ.
Keywords Actins/metabolismAnimalsAntigensCD44/metabolismBone ResorptionIntegrin beta3/metabolismIntracellular Membranes/metabolismMiceMiceKnockoutOsteoclasts/metabolismSignal TransductionWiskott-Aldrich Syndrome Protein/deficiency/genetics/metabolism
PMID: 17898081
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Research group Migration cellulaire (645)
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CHABADEL, Anne et al. CD44 and beta3 integrin organize two functionally distinct actin-based domains in osteoclasts. In: Molecular Biology of the Cell, 2007, vol. 18, n° 12, p. 4899-910. https://archive-ouverte.unige.ch/unige:26004

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Deposited on : 2013-01-29

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