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Related Experiment Video

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Analysis and Imaging of Osteocytes
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Stat3 in osteocytes mediates osteogenic response to loading.

Kylie A Corry1, Hongkang Zhou1, Tatiana Brustovetsky2

  • 1Department of Biology, Indiana University Purdue University Indianapolis, Indianapolis, IN 46202, USA.

Bone Reports
|August 24, 2019
PubMed
Summary
This summary is machine-generated.

Signal transducer and activator of transcription 3 (Stat3) is crucial for osteocyte mechanosensing and bone formation. Inhibiting Stat3 in osteocytes impairs bone remodeling and reduces load-induced bone formation, suggesting therapeutic potential.

Keywords:
ATPBone formationMechanotransductionOsteocyteROSSignal transducers and activators of transcription 3 (Stat3)

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Area of Science:

  • Bone Biology and Mechanotransduction
  • Cellular Signaling Pathways
  • Skeletal Physiology

Background:

  • Osteocytes are key mechanosensors in bone, integrating mechanical stimuli to regulate bone remodeling.
  • Signal transducer and activator of transcription 3 (Stat3) is a critical signaling protein found in various cell types, including osteocytes.
  • The specific role of Stat3 in osteocyte mechanosensing and its impact on bone metabolism remain incompletely understood.

Purpose of the Study:

  • To investigate the role of Stat3 in osteocyte mechanotransduction and its contribution to bone formation and remodeling.
  • To determine the effects of deleting Stat3 specifically in osteocytes on skeletal parameters and response to mechanical loading.
  • To explore the cellular mechanisms by which Stat3 mediates osteocyte responses to mechanical stress.

Main Methods:

  • Generation of osteocyte-specific Stat3 conditional knockout (Stat3cKO) mice using the Dmp-1(8kb)-Cre promoter.
  • Assessment of bone formation indices, osteoblast and osteoclast numbers, and material properties in Stat3cKO mice.
  • Evaluation of load-induced bone formation and in vitro osteocyte responses to Stat3 inhibition using WP1066.

Main Results:

  • Stat3cKO mice exhibited reduced bone formation, fewer osteoblasts, more osteoclasts, and altered material properties without changes in bone mineral density.
  • Mechanical loading resulted in significantly decreased bone formation in Stat3cKO mice compared to controls.
  • In vitro, WP1066 inhibited ATP-induced cytosolic calcium increase and elevated reactive oxygen species (ROS) in osteocytes.

Conclusions:

  • Stat3 is essential for osteocyte-mediated responses to mechanical stimuli.
  • Osteocytic Stat3 plays a critical role in regulating bone formation and remodeling.
  • Targeting osteocytic Stat3 presents a potential therapeutic strategy for enhancing bone anabolism and treating bone loss.