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MIRAVA POLYSCOPE – All in one and on for all: the perfect image
Science beyond Barriers

abberior instruments

Physiology

2015
Journal of Experimental Medicine

Oxysterols and EBI2 promote osteoclast precursor migration to bone surfaces and regulate bone mass homeostasis

Authors:

Nevius, E., Pinho, F., Dhodapkar, M., Jin, H., Nadrah, K., Horowitz, M. C., ... & Pereira, J. P.

Keywords:

common monocyte progenitor, carboxy-terminal collagen cross-link, Gαi protein–coupled receptor, macrophage and dendritic cell precursor, mesenchymal progenitor cell; µCT, microcomputed tomography, osteoblast, osteoclast, OC precursor, ligand for receptor activator of nuclear factor κ binding, tartrate-resistant acid phosphatase

Abstract:

Bone surfaces attract hematopoietic and nonhematopoietic cells, such as osteoclasts (OCs) and osteoblasts (OBs), and are targeted by bone metastatic cancers. However, the mechanisms guiding cells toward bone surfaces are essentially unknown. Here, we show that the Gαi protein–coupled receptor (GPCR) EBI2 is expressed in mouse monocyte/OC precursors (OCPs) and its oxysterol ligand 7α,25-dihydroxycholesterol (7α,25-OHC) is secreted abundantly by OBs. Using in vitro time-lapse microscopy and intravital two-photon microscopy, we show that EBI2 enhances the development of large OCs by promoting OCP motility, thus facilitating cell–cell interactions and fusion in vitro and in vivo. EBI2 is also necessary and sufficient for guiding OCPs toward bone surfaces. Interestingly, OCPs also secrete 7α,25-OHC, which promotes autocrine EBI2 signaling and reduces OCP migration toward bone surfaces in vivo. Defective EBI2 signaling led to increased bone mass in male mice and protected female mice from age- and estrogen deficiency–induced osteoporosis. This study identifies a novel pathway involved in OCP homing to the bone surface that may have significant therapeutic potential.

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Superresolution & Confocal Systems

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Superresolution & Confocal Modules

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