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Related Concept Videos

Role of Ephrin-Eph Signalling in Intestinal Stem Cell Renewal01:22

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Erythropoietin-producing hepatocellular carcinoma receptor (Eph) and its ligand, Eph receptor-interacting protein (Ephrin) were first discovered in the human carcinoma cell line, hence the name. Ephrin-Eph interaction guides cells to reach their appropriate location in adult tissues. They also play an essential role in the immune system by helping in immune cell migration, adhesion, and activation. Based on their structure and function, Eph is divided into two classes — EphA and EphB.
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Related Experiment Video

Updated: Jun 18, 2026

Dissection and Culture of Mouse Embryonic Kidney
08:30

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Published on: May 17, 2017

Eph and ephrin interactions in bone.

Koichi Matsuo1

  • 1Collaborative Research Resources, School of Medicine, Keio University, 160-8582 Tokyo, Japan. matsuo@sc.itc.keio.ac.jp

Advances in Experimental Medicine and Biology
|December 2, 2009
PubMed
Summary
This summary is machine-generated.

Bone cells, including osteoclasts and osteoblasts, use ephrin and Eph signaling for communication. This bidirectional signaling regulates bone remodeling, with ephrinB2 and EphB4 potentially mediating the switch from resorption to formation.

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Area of Science:

  • Cell Biology
  • Bone Biology
  • Molecular Signaling

Background:

  • Cell-surface molecules mediate communication between bone cells.
  • Ephrin ligands and Eph tyrosine kinase receptors are involved in various biological processes.
  • Ephrins and Ephs are expressed in osteoblasts and osteoclasts, regulating bone metabolism.

Purpose of the Study:

  • To investigate the role of ephrin/Eph signaling in bone cell communication and bone remodeling.
  • To propose a mechanism for the transition from bone resorption to bone formation mediated by ephrinB2 and EphB4.

Main Methods:

  • Analysis of ephrin and Eph expression in osteoblasts and osteoclasts.
  • Investigating the bidirectional signaling pathways involved.
  • Reviewing existing literature on ephrinB2 regulation and EphB4 involvement in bone diseases.

Main Results:

  • Ephrins and Ephs are expressed in bone cells and mediate bidirectional signaling.
  • The interaction between ephrinB2-expressing osteoclasts and EphB4-expressing osteoblasts is proposed to regulate bone remodeling.
  • EphrinB2 is regulated by PTH/PTHrP, and EphB4 may be involved in osteoarthritis.

Conclusions:

  • Ephrin/Eph signaling is crucial for intercellular communication among bone cells.
  • This signaling pathway plays a significant role in regulating bone mineral metabolism and bone remodeling.
  • Further research is warranted to fully elucidate the functions of various ephrins and Ephs in bone biology.