PROJECT TITLE :

Analysis of Cell Binding and Internalization of Multivalent PEG-Based Gene Delivery Vehicles

ABSTRACT:

RGD peptides have been incorporated into several gene delivery vehicles to enhance specific interactions of nonviral vehicles with the cell surface. However, there are contradictory results regarding the effect of linear RGD peptides on specific cell surface binding of polyethylene glycol (PEG)-conjugated gene delivery vehicles. This study sought to understand how coupling RGD peptides to PEG vehicles affects cell binding and internalization using a novel four arm PEG backbone. Coupling multiple RGD peptides to the PEG backbone increased the affinity of the vehicle for the cell surface, and that the PEG backbone did not reduce the affinity of RGD peptides for integrin receptors in both kinetic and equilibrium studies. Kinetic studies suggest that cellular internalization of PEG-based vehicles is not regulated by the RGD peptides on the vehicle, but rather by nonspecific interactions with heparan sulfate proteoglycans either alone or in combination with integrins. These results suggest that while increasing the number of RGD peptides per vehicle increases cell binding, but it does not contribute to increased internalization or transfection efficiency.


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