Expression and function of RANK in human monocyte chemotaxis

Arthritis and Rheumatism
Birgit A MosheimerChristian J Wiedermann

Abstract

RANKL, a member of the tumor necrosis factor superfamily, is a central regulator of osteoclast recruitment and activation. Whether RANKL affects monocyte locomotion in vitro via RANK and a possible signaling pathway were investigated. Monocytes were obtained from venous blood of healthy donors. Cell migration was studied by micropore filter assays. The signaling mechanisms required for RANKL-dependent migration were tested using signaling enzyme blockers and Western blot analyses. Expression of RANK messenger RNA (mRNA) in monocytes was demonstrated by reverse transcriptase-polymerase chain reaction, and receptor expression on cell surface was investigated by fluorescence-activated cell sorting analyses. RANKL significantly stimulated monocyte chemotaxis via activation of phosphatidylinositol 3-kinase, phosphodiesterase, and Src kinase. The effect on migration was inhibited by osteoprotegerin, which is the decoy receptor for RANKL. Expression of RANK receptor mRNA was shown, and synthesis of RANK in monocytes was suggested by the detection of RANK immunoreactivity on the cell surface. These data suggest that RANK is expressed by monocytes whose activation by RANKL stimulates directed migration involving phosphatidylinositol 3-k...Continue Reading

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