Abstract
Purpose
The present study aims to prepare poly(D,L-lactic acid) (PLA) nanofibers loaded by the immunosuppressant cyclosporine A (CsA, 10 wt%). Amphiphilic poly(ethylene glycol)s (PEG) additives were used to modify the hydrophobic drug release kinetics.
Methods
Four types of CsA-loaded PLA nanofibrous carriers varying in the presence and molecular weight (MW) of PEG (6, 20 and 35 kDa) were prepared by needleless electrospinning. The samples were extracted for 144 h in phosphate buffer saline or tissue culture medium. A newly developed and validated LC-MS/MS method was utilized to quantify the amount of released CsA from the carriers. In vitro cell experiments were used to evaluate biological activity.
Results
Nanofibers containing 15 wt% of PEG showed improved drug release characteristics; significantly higher release rates were achieved in initial part of experiment (24 h). The highest released doses of CsA were obtained from the nanofibers with PEG of the lowest MW (6 kDa). In vitro experiments on ConA-stimulated spleen cells revealed the biological activity of the released CsA for the whole study period of 144 h and nanofibers containing PEG with the lowest MW exhibited the highest impact (inhibition).
Conclusions
The addition of PEG of a particular MW enables to control CsA release from PLA nanofibrous carriers. The biological activity of CsA-loaded PLA nanofibers with PEG persists even after 144 h of previous extraction. Prepared materials are promising for local immunosuppression in various medical applications.
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Abbreviations
- ConA:
-
Concanavalin
- CsA:
-
Cyclosporine A
- HPLC:
-
High-performance liquid chromatography
- IL-2:
-
Interleukin-2
- LC-MS/MS:
-
Liquid chromatography tandem mass spectrometry
- MW:
-
Molecular weight
- PBS:
-
Phosphate buffer saline
- PEG:
-
Poly(ethylene glycol)
- PLA:
-
Poly(D,L-lactic acid)
- PLGA:
-
Poly(lactide-co-glycolide)
- SEM:
-
Scanning electron microscopy
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Acknowledgments and Disclosures
This work was supported by the Charles University in Prague [project number 307115 and SVV260440], the Grant Agency of the Czech Republic [project number 16-04863S] and the Ministry of Education, Youth and Sports of the Czech Republic within the National Sustainability Program II [Project BIOCEV-FAR LQ1604] and by the project “BIOCEV” [CZ.1.05/1.1.00/02.0109]. The authors thank to Nanovia Ltd. for cooperation in needleless electrospinning.
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Sirc, J., Hampejsova, Z., Trnovska, J. et al. Cyclosporine A Loaded Electrospun Poly(D,L-Lactic Acid)/Poly(Ethylene Glycol) Nanofibers: Drug Carriers Utilizable in Local Immunosuppression. Pharm Res 34, 1391–1401 (2017). https://doi.org/10.1007/s11095-017-2155-x
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DOI: https://doi.org/10.1007/s11095-017-2155-x