Mixed PEGylated Surfactant Modifying System Decrease the Accelerated Blood Clearance Phenomenon of Nanoemulsions in Rats
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The accelerated blood clearance (ABC) phenomenon which is induced by repeated injection of poly (ethylene glycol) (PEG)-coated colloidal carriers gives clinical challenge to the promising drug delivery system. It is necessary to decrease this unexpected immunological response. A novel 4-arm poly (ethylene glycol-5000)-cholesteryl methyl amide (4-arm PEG-CHMA) has been synthesized. The structure of 4-arm PEG-CHMA was confirmed by IR and H-NMR spectrum. The pharmacokinetics of the tocopheryl nicotinate (TN)-loaded nanoemulsions modified with 4-arm PEG-CHMA or/and 1, 2-distearoyl-Sn-glycero-3-phosphoethanolamine-n-[methoxy(poly-ethyleneglycol)-2000] (mPEG-DSPE) have been studied. Furthermore, the ABC phenomenon has been detailed investigated in rats by TN-loaded nanoemulsions modified with 4-arm PEG-CHMA and mPEG-DSPE (CPNE). The plasma levels of TN and anti-PEG IgM antibody were determined by HPLC and ELISA, respectively. The circulation time of the CPNEs were comparable to the mPEG-DSPE coated nanoemulsions. Moreover, the ABC phenomenon can be decreased by CPNEs. This study designs a method to decrease the ABC phenomenon and develops a clinical promising nanoemulsion for therapeutic or imaging purpose.
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