Cyclopeptides Containing RGD Mimetics As Imaging Markers For Integrins
申请人:Kolb Hartmuth C.
公开号:US20100074844A1
公开(公告)日:2010-03-25
Radiolabeled cyclic polypeptides, pharmaceutical compositions comprising radiolabeled cyclic polypeptides, and methods of using the radiolabeled cyclic polypeptides. Such polypeptides can be used in imaging studies, such as Positron Emitting Tomography (PET) or Single Photon Emission Computed Tomography (SPECT).
[EN] CYCLOPEPTIDES CONTAINING RGD MIMETICS AS IMAGING MARKERS FOR INTEGRINS<br/>[FR] CYCLOPEPTIDES CONTENANT DES MIMÉTIQUES RGD SERVANT DE MARQUEURS D'IMAGERIE POUR DES INTÉGRINES
申请人:SIEMENS MEDICAL SOLUTIONS
公开号:WO2009134382A2
公开(公告)日:2009-11-05
Radiolabeled cyclic polypeptides, pharmaceutical compositions comprising radiolabeled cyclic polypeptides, and methods of using the radiolabeled cyclic polypeptides. Such polypeptides can be used in imaging studies, such as Positron Emitting Tomography (PET) or Single Photon Emission Computed Tomography (SPECT). The radionuclide label is a positron or gamma emitter, e.g. 18F. The polypeptide core is a backbone cyclic RGD derivative of formula: (I) wherein R1 and R8 are side chains of natural or unnatural amino acids and w is an integer from 1 to 5.
Synthesis and Biological Evaluation of RGD-Conjugated MEK1/2 Kinase Inhibitors for Integrin-Targeted Cancer Therapy
Two novel series of RGD-MEKI conjugates derived from a MEK1/2 kinase inhibitor—PD0325901—have been developed for integrin receptor mediated anticancer therapy. The first series, alkoxylamine analog RGD-MEKI conjugates 9a–g showed anti-proliferation activity in melanoma A375 cells by the same mechanism as that of PD0325901. PEGylation increased the IC50 value of 9f three-fold in the A375 assay, and the multi-cRGD peptide cargo significantly improved the receptor specific anti-proliferation activity of 9g in integrin-overexpressing U87 cells. In the second series, RGD-PD0325901 13 exhibited significantly increased antitumor properties compared to the alkoxylamine analogs by both inhibition of the ERK pathway activity and DNA replication of the cancer cells. Furthermore, 13 displayed more potent anti-proliferation activity in the U87 assay than PD0325901 in a dose-dependent manner. All these data demonstrate that RGD-MEKI conjugates with an ester bond linkage enhanced anticancer efficacy with improved targeting capability toward integrin-overexpressing tumor cells.