Scl-Ab reverts pro-osteoclastogenic signalling and resorption in estrogen deficient osteocytes

Abstract Background Neutralising antibodies to sclerostin (Scl-Ab) have shown significant potential to induce bone formation and decrease bone resorption, increase strength and substantially reduce fracture risk in animal studies and clinical trials. Mechanical loading negatively regulates sclerostin expression, and sclerostin has been shown to induce RANKL synthesis in osteocytes. However, how Scl-Ab governs osteocyte regulation of osteoclast differentiation and function is not fully understood. We have recently discovered that osteoblasts and osteocytes alter osteoclastogenic signalling (RANKL/OPG) during estrogen-deficiency, and that osteoblast-induced osteoclastogenesis and resorption are exacerbated. However, it is not known whether estrogen deficient osteocytes exacerbate osteoclastogenesis. The aims of this study were to (1) establish whether osteocytes induce osteoclastogenesis and bone resorption during estrogen deficiency in vitro (2) investigate whether the sclerostin antibody can revert osteocyte-mediated osteoclastogenesis and resorption by attenuating RANKL/OPG expression. Results Using conditioned media and co-culture experiments we found increased osteocyte-induced osteoclastogenesis and bone resorption in estrogen deficient conditions. This is the first study to report that administration of Scl-Ab has the ability to revert osteocyte-mediated osteoclastogenesis and resorption by decreasing RANKL/OPG ratio expression and increasing WISP1 expression in estrogen deficient osteocytes. Conclusions This study provides an enhanced understanding of the biological changes underpinning decreases in bone resorption following Scl-Ab treatment observed in vivo by revealing that Scl-Ab can reduce pro-osteoclastogenic cell signalling between osteocytes and osteoclasts.

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PID https://www.doi.org/10.6084/m9.figshare.c.5197348.v1
PID https://www.doi.org/10.6084/m9.figshare.c.5197348
URL http://dx.doi.org/10.6084/m9.figshare.c.5197348
URL http://dx.doi.org/10.6084/m9.figshare.c.5197348.v1
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Author H. Allison
Author G. Holdsworth
Author L. M. McNamara
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Collected From Datacite
Hosted By figshare
Publication Date 2020-01-01
Publisher figshare
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keyword FOS: Health sciences
keyword FOS: Physical sciences
keyword FOS: Biological sciences
keyword FOS: Earth and related environmental sciences
system:type other
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Source https://science-innovation-policy.openaire.eu/search/other?orpId=dedup_wf_001::73c12509809822ae71572fca6e442c50
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Last Updated 20 December 2020, 03:12 (CET)
Created 20 December 2020, 03:12 (CET)