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Structural modifications of amino acid sequences of radiolabeled peptides for targeted tumor imaging
Fariba Maleki1, Arezou Masteri Farahani1, Farzaneh Rezazedeh1
1Department of Radiopharmacy, Faculty of Pharmacy, Mazandaran University of Medical Sciences, Sari, Iran; Student Research Committee, Faculty of Pharmacy, Mazandaran University of Medical Sciences, Sari, Iran.
Abstract:
Molecular imaging techniques are increasingly being used in localization, staging and therapy control of cancer. Due to their unique target specificity for the endogenous receptors, radiopeptides have been used widely for the development of radiopharmaceuticals for targeted tumor imaging in nuclear oncology. It is necessary to modify radiolabeled peptides in order to achieve more effective agents. Structural modifications of amino acid chains have significant effect on the metabolic stability, biological activity and efficiency of peptide conjugates that are currently applied as imaging tracers. There are several ways to modify the peptide chain but the most common strategies include amino acid substitutions, cyclization and multimerization. In this review, we have focused on studies involving these kind of modifications on amino acid sequences of radiolabeled peptides and we have provided an overview of the effects of these chemical modifications on the in vitro and in vivo properties of these radioconjugates and their potential as SPECT (Single photon emission computed tomography) and PET (positron emission tomography) imaging agents.
Insights
Modifying radiolabeled peptides through amino acid changes enhances their effectiveness for cancer imaging. These structural changes improve metabolic stability and biological activity for better tumor visualization in nuclear oncology.
Area of Science:
- Nuclear Oncology
- Radiopharmaceutical Chemistry
- Molecular Imaging
Background:
- Molecular imaging is crucial for cancer management, utilizing radiopeptides for targeted tumor detection.
- Radiopeptides offer target specificity for endogenous receptors, vital in nuclear oncology.
- Optimizing radiolabeled peptides is essential for developing more effective diagnostic and therapeutic agents.
Purpose of the Study:
- To review modifications of amino acid sequences in radiolabeled peptides.
- To analyze the impact of structural changes on radioconjugate properties.
- To assess the potential of modified radiolabeled peptides as Single Photon Emission Computed Tomography (SPECT) and Positron Emission Tomography (PET) imaging agents.
Main Methods:
- Review of studies focusing on amino acid substitutions, cyclization, and multimerization of radiolabeled peptides.
- Analysis of in vitro and in vivo data on modified radioconjugates.
- Evaluation of the effects of structural modifications on imaging tracer efficiency.
Main Results:
- Structural modifications significantly influence metabolic stability and biological activity.
- Amino acid substitutions, cyclization, and multimerization are key strategies for peptide enhancement.
- Modified radioconjugates show improved properties for SPECT and PET imaging.
Conclusions:
- Chemical modifications of radiolabeled peptides are critical for improving their performance in cancer imaging.
- Optimized peptide structures enhance diagnostic efficacy in nuclear oncology.
- Further research into modified radiolabeled peptides holds promise for advanced SPECT and PET applications.
