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Visualizing gene expression by whole-body fluorescence imaging.

M Yang1, E Baranov, A R Moossa

  • 1AntiCancer, Inc., 7917 Ostrow Street, San Diego, CA 92111, USA.

Proceedings of the National Academy of Sciences of the United States of America
|October 26, 2000
PubMed
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Researchers developed an affordable, rapid system to visualize transgene expression in live mice using green fluorescent protein (GFP). This noninvasive imaging technique allows real-time tracking of gene activity in major organs without expensive equipment or lengthy procedures.

Area of Science:

  • Biomedical Imaging
  • Molecular Biology
  • Animal Models

Background:

  • Noninvasive imaging of transgene expression in live animals is crucial for research.
  • Existing methods are often complex, costly, and time-consuming.

Purpose of the Study:

  • To develop a simple, rapid, and affordable system for visualizing transgene expression in intact live mice.
  • To enable real-time tracking of gene activity in major organs.

Main Methods:

  • Utilized adenoviral delivery of green fluorescent protein (GFP) into various organs (brain, liver, pancreas, prostate, bone marrow) of mice.
  • Employed a fluorescence light box and a cooled CCD camera for low-magnification whole-body imaging.
  • Used an epi-fluorescence dissecting microscope for higher-magnification imaging.

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Main Results:

  • Visible GFP fluorescence detected in brain and liver within 5-8 hours post-injection.
  • Whole-body images were recorded at video rates, enabling real-time observation.
  • GFP fluorescence persisted for up to 4 months in the liver.

Conclusions:

  • The developed system provides a simple, rapid, and affordable method for noninvasive in vivo imaging of transgene expression.
  • This technique facilitates the study of gene function and therapeutic applications in relatively opaque organisms.
  • No exogenous contrast agents, radioactive substrates, or long processing times are required.