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J Vis Exp. 2019 Jan 7;(143). doi: 10.3791/58218.

Preparing a 68Ga-labeled Arginine Glycine Aspartate (RGD)-peptide for Angiogenesis.

Author information

1
Division of Applied RI, Korea Institute of Radiological and Medical Sciences.
2
Division of Applied RI, Korea Institute of Radiological and Medical Sciences; jpark@kirams.re.kr.
3
Division of Applied RI, Korea Institute of Radiological and Medical Sciences; smhany@kirams.re.kr.

Abstract

The αvβ3 integrin is a heterodimeric adhesion molecule involved in tumor cell migration and angiogenesis. The integrin is overexpressed in angiogenic tumor endothelial cells, where it typically has a low concentration. This specific expression of αvβ3 makes it a valid biomarker for antiangiogenic and imaging drugs. As a functional imaging modality, positron emission tomography (PET) provides information about biochemical and physiological changes in vivo, due to its unique high sensitivity at the nanomolar scale. Hence, radiometal-based PET radiopharmaceuticals have received great attention for the non-invasive quantification of tumor angiogenesis. This paper provides a systemic protocol to prepare a new radiometal-labeled peptide for the evaluation of angiogenesis. This protocol contains information about radiochemical reliability, lipophilicity, cell uptake, serum stability, and pharmacokinetic properties. The 68Ga-RGD-peptide is one of the representative PET ligands toward αvβ3 integrin. Here, we introduce a protocol to prepare a 68Ga-RGD-peptide and the evaluation of its biological efficacy.

PMID:
30663663
DOI:
10.3791/58218

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