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A Novel in vivo Gene Transfer Technique and in vitro Cell Based Assays for the Study of Bone Loss in Musculoskeletal Disorders
11:47

A Novel in vivo Gene Transfer Technique and in vitro Cell Based Assays for the Study of Bone Loss in Musculoskeletal Disorders

Published on: June 8, 2014

Glucocorticoids and the osteoclast.

Hyun-Ju Kim1, Haibo Zhao, Hideki Kitaura

  • 1Department of Pathology and Immunology, Washington University School of Medicine, St Louis, MO 63110, USA.

Annals of the New York Academy of Sciences
|December 18, 2007
PubMed
Summary
This summary is machine-generated.

Glucocorticoids (GCs) cause bone loss by impairing osteoclast function, specifically their cytoskeleton organization. Blocking the GC receptor in osteoclasts prevents these negative effects on bone formation.

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Osteoclast Derivation from Mouse Bone Marrow
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Published on: November 6, 2014

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A Novel in vivo Gene Transfer Technique and in vitro Cell Based Assays for the Study of Bone Loss in Musculoskeletal Disorders
11:47

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Published on: June 8, 2014

Osteoclast Derivation from Mouse Bone Marrow
06:17

Osteoclast Derivation from Mouse Bone Marrow

Published on: November 6, 2014

Area of Science:

  • Bone biology
  • Endocrinology
  • Cellular signaling

Background:

  • Glucocorticoid (GC)-induced bone loss is a primary cause of secondary osteoporosis.
  • The precise mechanisms by which GCs affect bone cells, particularly osteoblasts, remain unclear.
  • Osteoclasts, key regulators of bone resorption, may influence GC effects on osteoblasts due to their interconnected roles in bone remodeling.

Purpose of the Study:

  • To investigate the role of osteoclasts in mediating the bone loss effects of glucocorticoids.
  • To determine if glucocorticoid receptor signaling in osteoclasts contributes to GC-induced suppression of bone formation.

Main Methods:

  • Compared the effects of dexamethasone on wild-type (WT) osteoclasts and osteoclasts lacking the glucocorticoid receptor (GR) in their lineage.
  • Assessed bone-degrading capacity and cytoskeletal organization of osteoclasts.
  • Examined the activation of RhoA, Rac, and Vav3 signaling pathways in response to M-CSF.

Main Results:

  • Dexamethasone suppressed the bone-degrading capacity of WT osteoclasts.
  • This inhibition was linked to impaired osteoclast cytoskeletal organization due to blocked M-CSF activation of RhoA, Rac, and Vav3.
  • Mice lacking the GR in osteoclast lineage cells were protected from dexamethasone's effects on osteoclasts and bone formation.

Conclusions:

  • Osteoclasts modulate the suppressive effects of glucocorticoids on bone formation.
  • Glucocorticoid receptor signaling within osteoclasts is critical for mediating GC-induced bone loss.
  • Targeting osteoclast GR may offer a therapeutic strategy against GC-induced osteoporosis.