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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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Hormones and Bone Tissue01:17

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The endocrine system produces and secretes hormones, which interact with the skeletal system. These hormones control bone growth, maintain bone once it is formed, and remodel it.
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Bone Cells and Tissue01:30

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Bones contain a relatively small number of cells entrenched in a matrix of organic and inorganic components. Although bone cells compose only a small amount of the bone volume, they are crucial to its function. Four types of cells are found within the bone tissue— osteoblasts, osteocytes, osteogenic cells, and osteoclasts.
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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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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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Aging and its effect on bone remodeling is the most common cause of bone disorders. In young and healthy people, bone deposition and resorption happen at an equal rate to maintain optimal bone health.
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Crosstalk between adipocytes and osteoblasts in regulating bone differentiation.

Mariana Liessa Rovis Sanches1, Cintia Kazuko Tokuhara2, Flávia Amadeu de Oliveira2

  • 1Department of Biological Sciences, Bauru School of Dentistry, University of São Paulo, Brazil.

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Adipose tissue hinders bone health by impairing osteoblast function. Adipocyte secretions disrupt bone formation, contributing to osteoporosis and highlighting pathways for therapeutic intervention.

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Area of Science:

  • Bone Biology
  • Cellular Interactions
  • Metabolic Bone Diseases

Background:

  • Bone homeostasis relies on intricate crosstalk between bone cells and adipose tissue within the bone marrow.
  • An imbalance favoring fat cell development (adipogenesis) over bone cell development (osteogenesis) is linked to osteoporosis and increased marrow fat.
  • Adipocyte-derived factors are implicated in modulating osteoblast activity and bone metabolism.

Purpose of the Study:

  • To investigate the impact of adipocyte-conditioned medium (CM) on osteoblast function and differentiation.
  • To identify molecular changes in osteoblasts exposed to adipocyte secretions.
  • To elucidate the mechanisms by which adipocytes influence the osteo-adipogenic balance.

Main Methods:

  • Treatment of osteoblasts with conditioned medium derived from adipocytes.
  • Assessment of cell viability, alkaline phosphatase (ALP) activity, and calcium deposition.
  • Proteomic analysis to identify differentially expressed proteins.
  • Bioinformatic analysis including STRING network analysis and assessment of epigenetic markers.

Main Results:

  • Adipocyte CM did not cause cytotoxicity but significantly impaired osteoblastic differentiation, evidenced by reduced calcium deposition and ALP activity.
  • Proteomic analysis revealed downregulation of crucial extracellular matrix proteins and upregulation of proteins associated with inflammation and oxidative stress (e.g., GAPDH, vimentin).
  • Network analysis indicated enrichment in stress response pathways, while epigenetic alterations like hemoglobin overexpression and reduced histone isoforms suggested NF-κB activation and oxidative stress.

Conclusions:

  • The adipocyte secretome creates a pro-inflammatory and oxidative stress-rich microenvironment that is detrimental to osteoblast differentiation and function.
  • Impaired mineralization, cytoskeletal dysfunction, and adverse epigenetic modifications are key consequences of adipocyte-osteoblast crosstalk.
  • Targeting these molecular pathways may offer novel therapeutic strategies for osteoporosis and related bone disorders.