mPEG-S-S-DSPE对DOPE脂质体在溶酶体条件下释放行为的影响
专著:Targeted delivery and triggered release of liposomal doxorubicin enhances cytotoxicity against human B lymphoma cells作著:T Ishida a 1, M.J Kirchmeier a 2, E.H Moase a, S Zalipsky b, T.M Allen 参考文献友链:提要:Since CFE is expected to contain cytoplasmic and lysosomal enzymes, the leakage of the hydrophilic, membrane-impermeable dye HPTS from formulations exposed to CFE may mimic the process of destabilization, in an intracellular environment, of liposomes stabilized with either mPEG-DSPE or mPEG-S-S-DSPE. CFE was adjusted to pH 5.5, approximating the lysosomal pH of between 5 and 6.5 [37], [38]. DOPE formulations, or DOPE formulations with 3 mol% mPEG-S-S-DSPE, released their contents in CFE with half-lives of 1.7 h (Fig. 3A). The release rate in CFE of the DOPE formulation with 5 mol% mPEG-S-S-DSPE was considerably slower; only 40% of encapsulated dye was released over 24 h (Fig. 3A). All three DOPE/CHEMS formulations, with or without mPEG-S-S-DSPE, released HPTS rapidly in CFE at pH 5.5; this release was almost complete by 8 h (Fig. 3B). DOPE/CHEMS and DOPE/CHEMS/mPEG-S-S-DSPE formulations incubated in CFE adjusted to pH 7.4 released HPTS at much slower rates (data not shown).