Abstract
Purpose
We recently developed prostaglandin E1 (PGE1)-encapsulated nanoparticles, prepared with a poly(lactide) homopolymer (PLA, Mw = 17,500) and monomethoxy poly(ethyleneglycol)-PLA block copolymer (PEG-PLA) (NP-L20). In this study, we tested whether the accelerated blood clearance (ABC) phenomenon is observed with NP-L20 and other PEG-modified PLA-nanoparticles in rats.
Methods
The plasma levels of PGE1 and anti-PEG IgM antibody were determined by EIA and ELISA, respectively.
Results
Second injections of NP-L20 were cleared much more rapidly from the circulation than first injections, showing that the ABC phenomenon was induced. This ABC phenomenon, and the accompanying induction of anti-PEG IgM antibody production, was optimal at a time interval of 7 days between the first and second injections. Compared to NP-L20, NP-L33s that were prepared with PLA (Mw = 28,100) and have a smaller particle size induced production of anti-PEG IgM antibody to a lesser extent. NP-L20 but not NP-L33s gave rise to the ABC phenomenon with a time interval of 14 days. NP-L33s showed a better sustained-release profile of PGE1 than NP-L20.
Conclusions
This study revealed that the ABC phenomenon is induced by PEG-modified PLA-nanoparticles. We consider that NP-L33s may be useful clinically for the sustained-release and targeted delivery of PGE1.
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Abbreviations
- ABC:
-
Accelerated blood clearance
- ADAM:
-
9-anthryldiazomethane
- AUC:
-
Area under the blood concentration-time curve
- CL:
-
Total body clearance
- DEA:
-
diethanolamine
- EPR:
-
Enhanced permeability and retention
- FBS:
-
Fetal bovine serum
- 1H-NMR:
-
Proton nuclear magnetic resonance
- HPLC:
-
High-performance liquid chromatography
- MPS:
-
Mononuclear phagocyte system
- MQW:
-
Milli-Q water
- Mw:
-
Molecular weight
- PBS:
-
Phosphate-buffered saline
- PEG:
-
Poly(ethyleneglycol)
- PGE1:
-
Prostaglandin E1
- PLA:
-
Poly(lactide)
- QOL:
-
Quality of life
- S.E.M.:
-
Standard error mean
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ACKNOWLEDGEMENTS
This work was supported by Grants-in-Aid for Scientific Research from the Ministry of Health, Labour, and Welfare of Japan, as well as the Japan Science and Technology Agency and Grants-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology, Japan.
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Ishihara, T., Takeda, M., Sakamoto, H. et al. Accelerated Blood Clearance Phenomenon Upon Repeated Injection of PEG-modified PLA-nanoparticles. Pharm Res 26, 2270–2279 (2009). https://doi.org/10.1007/s11095-009-9943-x
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DOI: https://doi.org/10.1007/s11095-009-9943-x