Abstract
Polysialic acid (PSA) is a nonimmunogenic and biodegradable polysaccharide. In recent years, PSA has shown its potential applications to cancer treatment. In this study, PSA-polyethylene glycol (PEG) conjugate was synthesized for the decoration of epirubicin (EPI)-loaded liposomes. The study aimed to evaluate the PSA-PEG conjugated modified liposomes (EPI-PSL) in vitro and in vivo to investigate the role of PSA on physicochemical characteristics and antitumor activity in PEGylated liposomes. EPI-PSL showed a particle size of 116.9 ± 5.2 nm, zeta potential of − 40.3 ± 3.5 mV, and encapsulation efficiency of 99.1 ± 1.5%. The results of in vitro release experiments showed a delayed release of EPI from EPI-PSL. Greater cellular uptake of EPI-PSL was observed compared with PEGylated liposomes (EPI-PL) in B16 cells. Cytotoxicity studies suggested that EPI-PSL exhibited stronger cytotoxic activity than EPI-PL. Though EPI-PSL exhibited comparable blood plasma profiles with EPI-PL, biodistribution studies proved that the distribution of EPI-PSL in tumors was more than that of EPI-PL. The superior antitumor efficacy of EPI-PSL was also verified in the B16 xenograft mouse model with a reduction in systemic toxicity. In conclusion, these results therefore indicated that PSA-modified PEGylated liposomes may represent an excellent anticancer drug delivery system for targeted cancer therapy.
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Abbreviations
- EPI:
-
Epirubicin
- PSA:
-
Polysialic acid
- DSPE-PEG2000-COOH:
-
1,2-Distearoyl-sn-glycero-3-phosphoethanolamine-N-[carboxy(polyethylene glycol)-2000] (ammonium salt)
- EPI-S:
-
EPI solution
- EPI-PL:
-
PEGylated liposomal EPI
- EPI-PSL:
-
PSA-PEG2000-DSPE-modified liposomal EPI
- EPR effect:
-
Enhanced permeation and retention effect
- EE:
-
Encapsulation efficiency
- AUC(0–t) :
-
Area under the drug concentration-time curve values
- C max :
-
Maximum concentration
- MRT(0–t) :
-
Mean residence time
- CLz:
-
Total clearance
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This research was supported by the National Natural Science Foundation of China (Grant No. 81373334).
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Zhang, T., Zhou, S., Hu, L. et al. Polysialic acid-polyethylene glycol conjugate-modified liposomes as a targeted drug delivery system for epirubicin to enhance anticancer efficiency. Drug Deliv. and Transl. Res. 8, 602–616 (2018). https://doi.org/10.1007/s13346-018-0496-6
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DOI: https://doi.org/10.1007/s13346-018-0496-6