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Related Experiment Videos

Localization of ADAM10 and Notch receptors in bone.

D J Dallas1, P G Genever, A J Patton

  • 1Department of Biology, University of York, UK. d.dallas@uea.ac.uk

Bone
|July 28, 1999
PubMed
Summary

The metallodisintegrin ADAM10 is expressed in bone cells and may activate Notch receptors, influencing osteoblast progenitor cell fate during skeletal development and remodeling.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Developmental Biology

Background:

  • The metallodisintegrin Kuzbanian (kuz) in Drosophila activates the Notch receptor, crucial for cell-fate determination.
  • ADAM10 is the mammalian ortholog of kuz, and its function in skeletal tissues is largely unknown.

Purpose of the Study:

  • To investigate the expression and potential role of ADAM10 and its substrate Notch2 in bone, bone cells, and cartilage.
  • To elucidate ADAM10's function in skeletal development and remodeling.

Main Methods:

  • Studied ADAM10 and Notch2 mRNA expression in neonatal rat tibiae using tissue sections.
  • Utilized in vitro studies with primary human osteoblasts and cell lines.
  • Determined ADAM10 protein localization in MG-63 cells via immunofluorescence and Western blot analysis.

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Main Results:

  • ADAM10 expression was found in articular cartilage chondrocytes and bone cells (periosteal cells, osteoblasts, osteocytes) at sites of bone formation, but not in osteoclasts.
  • Notch2 mRNA was not detected in superficial chondrocytes but colocalized with ADAM10 in bone cells.
  • ADAM10 protein was localized to the trans-Golgi network and plasma membrane in osteoblast cell lines, with distinct isoforms observed in each compartment.

Conclusions:

  • ADAM10 expression in bone cells suggests a role in skeletal tissue, potentially through Notch receptor activation.
  • ADAM10's presence in the trans-Golgi network indicates catalytic activity and involvement in cell-fate determination of osteoblast progenitors.
  • ADAM10 may play a role in skeletal development and bone remodeling, with plasma-membrane-associated ADAM10 potentially mediating other functions.