W Modified Polymeric Micelles with Different Hydrophobic Cores for Efficient Gene Delivery and Capillary-like Tube Formation.

Recently, polymeric micelles with different biodegradable hydrophobic cores, such as poly(lactide--glycolide) (PLGA) and poly(lactide--3(S)-methyl-morpholine-2,5-dione) (PLMD), have been used for gene delivery. The biodegradable hydrophobic cores should play an important role in gene delivery. However, little research has focused on selectively promoting proliferation and migration of endothelial cells (ECs) as well as vascularization by altering hydrophobic cores of polymeric micelles. Herein, we prepared two kinds of W peptide (selective adhesion for ECs) modified micelles with PLGA and PLMD as hydrophobic cores, respectively, and poly(ethylene glycol) (PEG) and polyethylenimine (PEI) as mixed hydrophilic shell. Their ability of condensing pEGFP-ZNF580 (pZNF580) to form gene complexes was proved by agarose gel electrophoresis assay. MTT results showed that the relative cell viability of the micelles with PLMD cores was higher than control groups and the micelles with PLGA cores. The cellular uptake ability of these W modified gene complexes was higher than the complexes without W target function. A similar trend was also found in transfection tests in vitro, which further demonstrated the effect of W peptide and different hydrophobic cores on gene delivery. The number of migrated cells treated by the gene complexes with PLGA cores was 82 (nontarget group) and 115 (target group), whereas the complexes with PLMD cores was 88 (nontarget group) and 120 (target group). Capillary-like tube formation of W peptide modified complexes with PLMD core group was much higher (about 6 times) than the PEI(10 kDa)/pZNF580 group. These results demonstrated that transfection efficiency, cell proliferation, migration, and vascularization could be promoted by altering hydrophobic cores and W modification.