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Transgenic mice for cGMP imaging.

Martin Thunemann1, Lai Wen, Matthias Hillenbrand

  • 1Interfakultäres Institut für Biochemie, Universität Tübingen, Tübingen, Germany.

Circulation Research
|June 27, 2013
PubMed
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This summary is machine-generated.

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New transgenic mice allow real-time visualization of cyclic GMP (cGMP) dynamics in cardiovascular tissues. This breakthrough enables detailed study of cGMP signaling in various physiological and pathological conditions.

Area of Science:

  • Cardiovascular Physiology
  • Molecular Biology
  • Genetics

Background:

  • Cyclic GMP (cGMP) is a critical intracellular signaling molecule in the cardiovascular system.
  • The spatiotemporal dynamics of cGMP in vivo remain largely uncharacterized.

Purpose of the Study:

  • To develop and validate transgenic mice expressing a ratiometric cGMP sensor (cGi500) for cardiovascular applications.
  • To enable visualization and quantification of cGMP signaling in live cardiovascular tissues.

Main Methods:

  • Generation of transgenic mouse lines with smooth muscle-specific or ubiquitous cGi500 expression.
  • Characterization of sensor fluorescence and cGMP responses in isolated cells and tissues.
  • In vivo imaging of nitric oxide-induced cGMP transients using multiphoton microscopy in a dorsal skinfold chamber model.
Keywords:
biosensing techniquescyclic GMPfluorescence resonance energy transfermicroscopy, fluorescence, multiphotonmuscle, smoothvasodilation

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Main Results:

  • cGi500 sensor successfully expressed in cardiovascular tissues, showing strong fluorescence.
  • cGMP levels increased significantly upon stimulation with agents like DEA/NO and natriuretic peptides, reaching peak concentrations of approximately 3 µmol/L.
  • Nitric oxide-induced cGMP transients were observed in retinal blood vessels, cremaster microcirculation, and in vivo vascular preparations, correlating with vasodilation.

Conclusions:

  • The developed cGi500 transgenic mice provide a powerful tool for visualizing cardiovascular cGMP signals.
  • This technology facilitates research under normal and pathological conditions, as well as during pharmacotherapy.
  • Enables real-time monitoring of cGMP dynamics in live cells, tissues, and whole animals.