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EGFR- and Integrin αVβ3-Targeting Peptides as Potential Radiometal-Labeled Radiopharmaceuticals for Cancer
Cibele Rodrigues Toledo1, Ahmed A Tantawy1,2, Leonardo Lima Fuscaldi3
1The Institute for Quantitative Health Science & Engineering, Michigan State University, East Lansing, MI 48824, USA.
Abstract:
The burgeoning field of cancer theranostics has witnessed advancements through the development of targeted molecular agents, particularly peptides. These agents exploit the overexpression or mutations of specific receptors, such as the Epidermal Growth Factor receptor (EGFR) and αVβ3 integrin, which are pivotal in tumor growth, angiogenesis, and metastasis. Despite the extensive research into and promising outcomes associated with antibody-based therapies, peptides offer a compelling alternative due to their smaller size, ease of modification, and rapid bioavailability, factors which potentially enhance tumor penetration and reduce systemic toxicity. However, the application of peptides in clinical settings has challenges. Their lower binding affinity and rapid clearance from the bloodstream compared to antibodies often limit their therapeutic efficacy and diagnostic accuracy. This overview sets the stage for a comprehensive review of the current research landscape as it relates to EGFR- and integrin αVβ3-targeting peptides. We aim to delve into their synthesis, radiolabeling techniques, and preclinical and clinical evaluations, highlighting their potential and limitations in cancer theranostics. This review not only synthesizes the extant literature to outline the advancements in peptide-based agents targeting EGFR and integrin αVβ3 but also identifies critical gaps that could inform future research directions. By addressing these gaps, we contribute to the broader discourse on enhancing the diagnostic precision and therapeutic outcomes of cancer treatments.
Insights
Peptides targeting cancer receptors like EGFR and integrin αVβ3 show promise in theranostics. While offering advantages over antibodies, challenges in binding affinity and clearance need further research for improved cancer treatment.
Area of Science:
- Oncology
- Molecular Imaging
- Drug Development
Background:
- Cancer theranostics utilizes targeted molecular agents, with peptides emerging as alternatives to antibodies.
- Peptides target specific receptors like Epidermal Growth Factor receptor (EGFR) and integrin αVβ3, crucial for tumor progression.
- Antibody-based therapies show promise, but peptides offer benefits like smaller size and enhanced bioavailability.
Purpose of the Study:
- To provide a comprehensive review of EGFR- and integrin αVβ3-targeting peptides in cancer theranostics.
- To synthesize current research on peptide synthesis, radiolabeling, and evaluation.
- To identify research gaps and inform future directions in peptide-based cancer theranostics.
Main Methods:
- Literature review of scientific publications on peptide-based cancer theranostics.
- Analysis of synthesis and radiolabeling techniques for targeted peptides.
- Evaluation of preclinical and clinical data for EGFR- and integrin αVβ3-targeting peptides.
Main Results:
- Peptides offer advantages in tumor penetration and reduced toxicity compared to antibodies.
- Challenges include lower binding affinity and rapid blood clearance, impacting efficacy and diagnostics.
- Advancements in peptide design and targeting strategies are continuously being made.
Conclusions:
- EGFR- and integrin αVβ3-targeting peptides hold significant potential in cancer theranostics.
- Addressing limitations in binding affinity and pharmacokinetics is crucial for clinical translation.
- Further research is needed to optimize peptide agents for enhanced diagnostic precision and therapeutic outcomes.
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