Article ID Journal Published Year Pages File Type
1427627 Journal of Controlled Release 2006 9 Pages PDF
Abstract

In this study, we tested whether sterically stabilized liposomes (SSL) with surface ligands specific for the mu opioid receptor (MOR) can actively target MOR-expressing cells. Dermorphin, a selective MOR agonist, was conjugated to DSPE-PEG3400 to obtain DSPE-PEG3400-dermorphin. Dermorphin-grafted SSL (dermorphin-SSL) was prepared by thin-film rehydration–extrusion and post-insertion method. DSPE-PEG3400-dermorphin and dermorphin-SSL retained the affinity to MOR as determined by receptor binding assay using [3H]DAMGO, whereas plain SSL without surface ligands showed no binding to the receptor. Cellular uptake of cholesteryl BODIPY encapsulated dermorphin-SSL was studied by microplate spectrofluorometry as well as fluorescent and confocal microscopy. Significant fluorescence signal was observed inside CHO-hMOR cells after the treatment with dermorphin-SSL, indicative of MOR-mediated endocytosis. In contrast, no uptake of dermorphin-SSL was found in naive CHO cells or CHO-hDOR cells that lack MOR. Taken together, these results demonstrate that dermorphin-SSL delivery system is capable of targeting intracellular components of MOR-expressing cells. Such a system may be applied to carry pharmaceutical agents to achieve region-specific delivery of analgesics and/or to attenuate side effects associated with opioids.

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