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Protein Dynamics in Living Cells

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In Situ Monitoring of Transiently Formed Molecular Chaperone Assemblies in Bacteria, Yeast, and Human Cells
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Visualizing cellular interactions with a generalized proximity reporter.

Mark A Sellmyer1, Laura Bronsart, Hiroshi Imoto

  • 1Department of Chemical and Systems Biology, Stanford University, Stanford, CA 94305, USA.

Proceedings of the National Academy of Sciences of the United States of America
|May 8, 2013
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel bioluminescent proximity reporter to visualize cell-cell interactions in vivo. This imaging tool detects microscopic cellular events, aiding in the study of cancer and immune responses in live animals.

Keywords:
bioengineeringbioluminescence imagingchemical biologyimmunologysystems biology

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Area of Science:

  • Molecular imaging
  • Cell biology
  • Biotechnology

Background:

  • Cell-cell interactions are crucial for physiological processes and disease development.
  • Current molecular imaging lacks tools to detect microscopic cell proximity events globally in vivo.
  • Pathologies like cancer and infection arise from dysfunctional cellular interactions.

Purpose of the Study:

  • To develop a broadly applicable, longitudinal strategy for probing cell-cell interactions in living subjects.
  • To create a reporter system that generates bioluminescence upon cell proximity.
  • To evaluate the reporter for imaging tumor-immune cell interactions in a preclinical cancer model.

Main Methods:

  • Generation of a bioluminescent reporter system activated by the close proximity of two distinct cell populations.
  • In vitro validation of the reporter strategy in cell culture models.
  • In vivo evaluation using a murine breast cancer model to image tumor-immune cell interactions.

Main Results:

  • The bioluminescent reporter successfully generated optical signals correlating with cell proximity.
  • The system visualized otherwise difficult-to-observe features, including micrometastatic lesions.
  • Potential sites of tumor immunosurveillance were identified using the proximity reporter.

Conclusions:

  • The novel proximity reporter enables facile visualization of cell-cell interactions in live animals.
  • This technology can facilitate the study of various cell-cell interactions, including those in cancer.
  • The approach holds promise for detecting rare events and pathological processes in vivo.