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Updated: Jun 24, 2026
Studying the Stoichiometry of Epidermal Growth Factor Receptor in Intact Cells using Correlative Microscopy
Published on: September 11, 2015
SPECT and PET imaging of EGF receptors with site-specifically labeled EGF and dimeric EGF
Zoya Levashova1, Marina V Backer, George Horng
1Department of Radiology/MIPS, Stanford University School of Medicine, California 94305, USA.
Abstract:
We describe a new generation of tracers for molecular imaging of the cell surface receptors for epidermal growth factor (EGF). These receptors play a key role in the progression of many tumors and are major drug development targets. Our tracers are based on a recombinant human EGF expressed with a cysteine-containing tag that enables facile site-specific radiolabeling with (99m)Tc for single photon emission computed tomography or site-specific conjugation of (64)Cu PEGylated chelators for positron emission tomography. These tracers retain EGF activities in vitro and display selective and highly specific focal uptake in tumors in vivo. We expect that nuclear imaging of EGF receptors with these tracers will be useful for clinical diagnosis, therapeutic monitoring, and development of new drugs and treatment regimens.
Insights
New molecular imaging tracers for epidermal growth factor (EGF) receptors enable precise tumor visualization. These novel tracers facilitate enhanced diagnosis and therapeutic monitoring for cancer patients.
Area of Science:
- Oncology
- Molecular Imaging
- Radiochemistry
Background:
- Epidermal growth factor (EGF) receptors are crucial in tumor progression and are key targets for cancer drug development.
- Accurate molecular imaging of EGF receptors is essential for diagnosis, treatment monitoring, and drug discovery.
Purpose of the Study:
- To develop a new generation of molecular imaging tracers for cell surface EGF receptors.
- To enable site-specific radiolabeling for SPECT and PET imaging.
Main Methods:
- Generation of recombinant human EGF with a cysteine-containing tag.
- Site-specific radiolabeling with Technetium-99m ((99m)Tc) for SPECT.
- Site-specific conjugation of Copper-64 ((64)Cu) PEGylated chelators for PET.
Main Results:
- Tracers demonstrated retained EGF activity in vitro.
- Tracers showed selective and highly specific focal uptake in tumors in vivo.
- Successful site-specific radiolabeling and conjugation were achieved.
Conclusions:
- The new EGF-based tracers are effective for molecular imaging of EGF receptors.
- These tracers can be utilized for SPECT and PET imaging modalities.
- Nuclear imaging with these tracers will aid in clinical diagnosis, therapeutic monitoring, and drug development for cancers involving EGF receptors.
