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"Polymultivalent" Polymer-Peptide Cluster Conjugates for an Enhanced Targeting of Cells Expressing αvβ3 Integrins.
Bioconjugate Chemistry 2017 September 21
A new class of "polymultivalent" ligands combining several ligand clusters and a water-soluble biocompatible polymer is introduced. These original conjugates bear two levels of multivalency. They are prepared by covalent coupling of a controlled number of tetrameric cRGD peptide clusters along a well-defined copolymer synthesized by RAFT polymerization. The presence of multiple copies of peptide clusters on the same polymer backbone resulted in a much-higher relative potency than the free cluster reference. Thanks to the "polymultivalency", up to ∼2 orders of magnitude potency enhancement was reached in a competitive cell adhesion assay (nanomolar-range IC50 values). In addition, confocal microscopy and flow cytometry demonstrated that fluorescent "polymultivalent" conjugates (emitting in the far-red/near-infrared region) were able to specifically and selectively label cells expressing αvβ3-integrin, the natural receptor of cRGD.
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