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Related Concept Videos

Osteoclasts in Bone Remodeling01:31

Osteoclasts in Bone Remodeling

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Osteoclasts are cells responsible for bone resorption and remodeling. They originate from hematopoietic progenitor cells present in the bone marrow. Numerous progenitor cells fuse to form multinucleated cells, each with 10-20 nuclei. A single osteoclast has a diameter of 150 to 200 µM. These cells have ruffled borders that break down the underlying bone tissue and release minerals such as calcium into the blood in bone resorption. Osteoclasts cling to bones with their ruffled edges during...
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Bone Formation by Intramembranous Ossification01:29

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Intramembranous ossification is one of the two processes involved in the development of bones within an embryo. The flat bones of the face, most of the cranial bones, and the clavicles are formed via this process. During intramembranous ossification, the bones develop directly from sheets of undifferentiated mesenchymal connective tissue.
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Bone Formation by Endochondral Ossification01:24

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Bone formation, or ossification, begins around the sixth to seventh week of embryonic development. Most bones develop from a cartilaginous template through the process of endochondral ossification. Cartilage formation begins when clusters of mesenchymal cells differentiate into chondrocytes. These chondrocytes proliferate rapidly and secrete an extracellular matrix that becomes encased in a membrane called the perichondrium. The resulting cartilage model provides a template that resembles the...
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Within the skeletal system, the structure of a bone, or osseous tissue, can be exemplified in a long bone, like the femur, where there are two types of osseous tissue: cortical and cancellous.
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Bone remodeling is a continuous and balanced process of bone resorption by osteoclasts and bone formation by osteoblasts. In adults, it helps maintain bone mass and calcium homeostasis. While mechanical stress can stimulate turnover as part of the normal maintenance and reparative process, several hormones also regulate bone remodeling.
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Compact Bone01:27

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Most bones contain compact and spongy osseous tissue, but their distribution and concentration vary based on the bone's overall function.
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Related Experiment Video

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Osteoclast Derivation from Mouse Bone Marrow
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Osteoclast-derived SLIT3 is a coupling factor linking bone resorption to bone formation.

Jung-Min Koh1

  • 1Division of Endocrinology and Metabolism, Asan Medical Center, University of Ulsan College of Medicine, Seoul 05505, Korea.

BMB Reports
|May 17, 2018
PubMed
Summary

Osteoclast-derived SLIT3 is a novel bone coupling factor. It promotes osteoblast activity and inhibits osteoclast formation, suggesting SLIT3 as a therapeutic target for metabolic bone diseases.

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Area of Science:

  • Bone Biology and Metabolism
  • Cell Signaling and Communication

Background:

  • Bone remodeling involves a tightly regulated coupling process between bone resorption and formation.
  • The molecular mechanisms coordinating osteoblast and osteoclast activity remain incompletely understood.
  • Identifying novel coupling factors is crucial for understanding and treating metabolic bone diseases.

Purpose of the Study:

  • To identify novel osteocrine factors involved in bone coupling.
  • To elucidate the role of SLIT3 in regulating osteoblast and osteoclast function.
  • To evaluate SLIT3 as a potential therapeutic target for osteopenic conditions.

Main Methods:

  • Fractionated secretomics to identify osteoclast-derived factors.
  • In vitro studies assessing SLIT3 effects on osteoblast recruitment, proliferation, and osteoclast differentiation.
  • In vivo studies using Slit3 and Robo1 knockout mice, and a truncated SLIT3 protein treatment in an osteopenic mouse model.

Main Results:

  • Osteoclast-derived SLIT3 was identified as a novel coupling factor.
  • SLIT3 promotes osteoblast activity via beta-catenin signaling and inhibits osteoclastogenesis through autocrine suppression.
  • Slit3 deficiency in mice leads to osteopenia characterized by reduced bone formation and increased bone resorption.
  • A truncated SLIT3 protein successfully increased bone mass in an osteopenic mouse model.

Conclusions:

  • SLIT3 acts as a critical mediator linking bone resorption and formation.
  • SLIT3 signaling plays a dual role in bone remodeling by stimulating bone formation and suppressing bone resorption.
  • SLIT3 represents a promising therapeutic target for treating metabolic bone diseases like osteoporosis.