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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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Electricity is generated by either electrons or ions flowing through a solution or a conducting medium. This flow of electrons or specifically electrical charge is defined as an electric current. When electrons move through a wire, they generate an electric current. It can be recalled  that in a redox reaction, electrons are lost and gained. In the spontaneous redox reaction of zinc  with copper, when zinc is immersed in a copper ion solution, a transfer of electrons from one substance to...
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Analysis and Imaging of Osteocytes
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Vinculin Force Sensor Detects Tumor-Osteocyte Interactions.

Fangjia Li1, Andy Chen2, Andrew Reeser2

  • 1Department of Physics, Indiana University Purdue University Indianapolis, Indianapolis, IN, 46202, USA.

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|April 6, 2019
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Summary
This summary is machine-generated.

Osteocytes, bone cells, influence tumor cell migration by altering focal adhesion tension. Tumor-osteocyte interactions reduce tumor cell motility and tension, impacting cancer progression.

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Area of Science:

  • Biophysics
  • Cell Biology
  • Cancer Research

Background:

  • Osteocytes are crucial mechanosensitive cells within bone tissue.
  • Tumor cell migration is a key factor in cancer metastasis.
  • Cellular interactions and mechanical forces influence migratory behavior.

Purpose of the Study:

  • To investigate the effect of osteocytes on tumor cell migration.
  • To quantify the role of focal adhesion tension in tumor cell motility.
  • To understand how tumor-osteocyte interactions modulate mechanical forces.

Main Methods:

  • Utilized Förster resonance energy transfer (FRET)-based molecular tension sensors.
  • Employed live cell imaging and co-culture systems.
  • Analyzed vinculin tension in focal adhesions of breast cancer cells (MDA-MB-231).

Main Results:

  • Osteocyte-conditioned media (CM) decreased tumor cell focal adhesion tension and migration.
  • Media from osteocytes under shear stress (FFCM) increased tension and migration.
  • Proximity to osteocytes reduced tumor cell tension and motility.

Conclusions:

  • Focal adhesion tension is a critical mediator of tumor cell migratory potential.
  • Tumor-osteocyte interactions can decrease tumor cell tension and motility.
  • Osteocytes play a regulatory role in tumor cell behavior within the bone microenvironment.