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Related Experiment Videos

Imaging transgene expression with radionuclide imaging technologies.

S S Gambhir1, H R Herschman, S R Cherry

  • 1Department of Molecular and Medical Pharmacology, UCLA School of Medicine, Los angeles, CA 90095-1770, USA. sgambhir@mednet.ucla.edu

Neoplasia (New York, N.Y.)
|August 10, 2000
PubMed
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Positron emission tomography (PET) and single photon emission computed tomography (SPECT) offer advanced imaging for gene expression studies. These radionuclide methods are crucial for advancing gene therapy trials and preclinical research.

Area of Science:

  • Biomedical Imaging
  • Molecular Biology
  • Radiochemistry

Background:

  • Noninvasive, quantitative imaging of gene expression is vital for advancing gene therapy and studying cellular/molecular therapies.
  • Radionuclide imaging techniques like SPECT and PET are mature technologies with high sensitivity and quantitative capabilities.
  • SPECT and PET offer advantages over optical and MRI-based methods for gene expression imaging, enabling translation from small animal models to human applications.

Purpose of the Study:

  • To describe a microPET scanner designed for small animal studies.
  • To review marker/reporter gene imaging approaches, specifically using herpes simplex virus type 1 thymidine kinase (HSV1-tk) and dopamine D2 receptor (D2R) genes.
  • To compare radiolabeled probes for HSV1-tk reporter gene imaging via SPECT and PET.

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Main Methods:

  • Development and description of a microPET scanner for small animal imaging.
  • Review of "marker/reporter gene" strategies, including HSV1-tk and D2R.
  • Contrast of various radiolabeled probes for HSV1-tk imaging using SPECT and PET.

Main Results:

  • The microPET scanner is optimized for small animal gene expression studies.
  • HSV1-tk and D2R serve as effective reporter genes for noninvasive imaging.
  • Different radiolabeled probes exhibit varying advantages and disadvantages for SPECT and PET imaging of HSV1-tk.

Conclusions:

  • SPECT and PET are powerful tools for noninvasive, quantitative gene expression imaging.
  • Reporter gene imaging, particularly with HSV1-tk, facilitates preclinical and clinical research.
  • Further development and application of these imaging modalities will accelerate gene therapy and molecular imaging research.