量研学術機関リポジトリ「QST-Repository」は、国立研究開発法人 量子科学技術研究開発機構に所属する職員等が生み出した学術成果(学会誌発表論文、学会発表、研究開発報告書、特許等)を集積しインターネット上で広く公開するサービスです。 Welcome to QST-Repository where we accumulates and discloses the academic research results(Journal Publications, Conference presentation, Research and Development Report, Patent, etc.) of the members of National Institutes for Quantum Science and Technology.
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Integrins play a pivotal role in many physiological processes such as neo-angiogenesis, cell adhesion and proliferation, and thus are key proteins in pathological disorders such as cancer metastasis, thrombosis, osteoporosis, and autoimmune diseases. For molecular imaging agents based on small peptidic integrin ligands, such as the αvβ3-integrin ligand c(RGDfK), has been found to greatly improve target affinities and in vivo performance. Kessler et al. described the systematic screening of c(-phgisoDGR-X-) lead motif aiming to confer to the small lead pentapeptide selectivity toward the Fn-binding integrins α5β1 and αvβ6 (1). The cyclic peptide c(-phg-isoDGR-k-) displayed an antagonistic activity for α5β1 (IC50: 8.7 nM), thus representing the first report of a small-sized, highly active, cyclic peptide selectively targeting α5β1 integrins (2). Cu-64 labeled ligands are useful in PET studies because of the clinically suitable nuclear properties of Cu-64 and its availability at high molar activity. This property allows sufficient time for clearance of non-specific radioactivity from background tissues to increase image contrast, which requires long times to circulate throughout the whole body. Moreover, Cu-64 labeled ligands are demonstrably effective for radioimmunotherapy. Meanwhile, Cu-67 is one of the most promising radioactive metals for radiotherapy. Here, we report radiolabeling and evaluation of c(-phg-isoDGR-k(DOTA)-) using radioactive cooper.
(1) Frank, A. O. et al. Angew. Chem., Int. Ed. 2010, 49, 9278−9281.
(2) Bochen, A. et al. J. Med. Chem. 2013, 56, 1509−1519.
会議概要(会議名, 開催地, 会期, 主催者等)
14th International Comference on Radiopharmaceutical Therapy