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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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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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Stimulation of Notch Signaling in Mouse Osteoclast Precursors
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Intercellular signaling between ameloblastoma and osteoblasts.

Elissa Chairani1,2,3, Takao Fuchigami2, Hirofumi Koyama1

  • 1Department of Biochemistry and Genetics, Kagoshima University Graduate School of Medical and Dental Sciences, 8-35-1 Sakuragaoka, Kagoshima, 890-8544, Japan.

Biochemistry and Biophysics Reports
|March 4, 2022
PubMed
Summary

This study reveals that osteoblasts promote ameloblastoma growth by inducing inflammatory cytokines and matrix metalloproteinases (MMPs). Understanding these interactions is key to targeting ameloblastoma progression.

Keywords:
AM-3AmeloblastomaCytokineIntercellular communicationOsteoblastTumor-bone microenvironment

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Area of Science:

  • Oral pathology
  • Oncology
  • Cell biology

Background:

  • Ameloblastoma is a locally invasive jaw tumor with high recurrence rates.
  • The role of osteoblasts in ameloblastoma pathogenesis is poorly understood.
  • Bone microenvironment cells influence tumor growth.

Purpose of the Study:

  • To investigate the intercellular signaling between ameloblastoma cells and osteoblasts.
  • To determine the effect of osteoblasts on ameloblastoma cell behavior.
  • To analyze cytokine and MMP production in cell-cell interactions.

Main Methods:

  • Co-culture of human ameloblastoma (AM-3) and murine pre-osteoblast (MC3T3-E1) cell lines.
  • Treatment with conditioned media from opposing cell types.
  • Analysis of cytokine (IL-6, MCP-1, RANTES) and MMP (MMP-2) production.
  • Assessment of cell proliferation and migration.

Main Results:

  • Ameloblastoma conditioned media induced inflammatory cytokines (IL-6, MCP-1, RANTES) in osteoblasts, mediated by IL-1 receptor.
  • Osteoblast conditioned media increased MMP-2 expression in ameloblastoma cells.
  • Osteoblast conditioned media enhanced ameloblastoma cell proliferation and migration.

Conclusions:

  • Intercellular signaling between ameloblastoma cells and osteoblasts influences tumor pathogenesis.
  • Osteoblasts may promote ameloblastoma growth and invasion through cytokine and MMP modulation.
  • Targeting these interactions could offer new therapeutic strategies for ameloblastoma.