Abstract
Purpose
This study seeks to develop fiber membranes for local sustained delivery of 25-hydroxyvitamin D3 to induce the expression and secretion of LL-37 at or near the surgical site, which provides a novel therapeutic approach to minimize the risk of infections.
Methods
25-hydroxyvitamin D3 loaded poly(L-lactide) (PLA) and poly(ε-caprolactone) (PCL) fibers were produced by electrospinning. The morphology of obtained fibers was characterized using atomic force microscope (AFM) and scanning electron microscope (SEM). 25-hydroxyvitamin D3 releasing kinetics were quantified by enzyme-linked immunosorbent assay (ELISA) kit. The expression of cathelicidin (hCAP 18) and LL-37 was analyzed by immunofluorescence staining and ELISA kit. The antibacterial activity test was conducted by incubating pseudomonas aeruginosa in a monocytes’ lysis solution.
Results
AFM images suggest that the surface of PCL fibers is smooth, however, the surface of PLA fibers is relatively rough, in particular, after encapsulation of 25-hydroxyvitamin D3. The duration of 25-hydroxyvitamin D3 release can last more than 4 weeks for all the tested samples. Plasma treatment can promote the release rate of 25-hydroxyvitamin D3. Human keratinocytes and monocytes express significantly higher levels of hCAP18/LL-37 after incubation with plasma treated and 25-hydroxyvitamin D3 loaded PCL fibers than the cells incubated with around ten times amount of free drug. After incubation with this fiber formulation for 5 days LL-37 in the lysis solutions of U937 cells can effectively kill the bacteria.
Conclusions
Plasma treated and 25-hydroxyvitamin D3 loaded PCL fibers induce significantly higher levels of antimicrobial peptide production in human keratinocytes and monocytes without producing cytotoxicity.
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Abbreviations
- AFM:
-
Atomic force microscope
- CFUs:
-
Colony-forming units
- DAPI:
-
4′,6-diamidino-2-phenylindole
- DCM:
-
Dichloromethane
- D-MEM:
-
Dulbecco’s modified eagle medium
- DMF:
-
N, N-dimethylformamide
- DMSO:
-
Dimethylsulfoxide
- ELISA:
-
Enzyme-linked immunosorbent assay
- FBS:
-
Fetal bovine serum
- FDA:
-
U.S. Food and Drug Administration
- FITC:
-
Fluorescein isothiocyanate
- LB:
-
Luria-Bertani
- PBS:
-
Phosphate buffer solution
- PCL:
-
Poly(ε-caprolactone)
- PLA:
-
Poly(L-lactide)
- RPMI:
-
Roswell Park Memorial Institute
- SEM:
-
Scanning electron microscope
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ACKNOWLEDGMENTS AND DISCLOSURES
This work was supported partially from startup funds from University of Nebraska Medical Center and National Institute of General Medical Science (NIGMS) grant 2P20 GM103480-06.
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Jiang, J., Chen, G., Shuler, F.D. et al. Local Sustained Delivery of 25-Hydroxyvitamin D3 for Production of Antimicrobial Peptides. Pharm Res 32, 2851–2862 (2015). https://doi.org/10.1007/s11095-015-1667-5
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DOI: https://doi.org/10.1007/s11095-015-1667-5