Abstract
Purpose
Pulmonary infection namely tuberculosis is characterized by alveolar macrophages harboring a large microbe population. The chitosan nanoparticles exhibit fast extracellular drug release in aqueous biological milieu. This study investigated the matrix effects of chitosan nanoparticles on extracellular drug diffusion into macrophages.
Methods
Oligo, low, medium and high molecular weight chitosan nanoparticles were prepared by nanospray drying technique. These nanoparticles were incubated with alveolar macrophages in vitro and had model drug sodium fluorescein added into the same cell culture. The diffusion characteristics of sodium fluorescein and nanoparticle behavior were investigated using fluorescence microscopy, scanning electron microscopy, differential scanning calorimetry and Fourier transform infrared spectroscopy techniques.
Results
The oligochitosan nanoparticles enabled macrophage membrane fluidization with the extent of sodium fluorescein entry into macrophages being directly governed by the nanoparticle loading. Using nanoparticles made of higher molecular weight chitosan, sodium fluorescein permeation into macrophages was delayed due to viscous chitosan diffusion barrier at membrane boundary.
Conclusion
Macrophage-chitosan nanoparticle interaction at membrane interface dictates drug migration into cellular domains.
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Abbreviations
- Abs:
-
Absorbance
- DD:
-
Deacetylation degree
- DSC:
-
Differential scanning calorimetry
- EDTA:
-
Ethylene diamine tetraacetate
- FTIR:
-
Fourier transform infrared spectrometry
- HCS:
-
High molecular weight chitosan
- HIV:
-
Human immunodeficiency virus
- KBr:
-
Potassium bromide
- LCS:
-
Low molecular weight chitosan
- MCS:
-
Medium molecular weight chitosan
- MTT:
-
(3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide
- OCS:
-
Oligochitosan
- TIRF:
-
Total internal reflection fluorescence
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ACKNOWLEDGMENTS AND DISCLOSURES
The authors wish to express their heart-felt gratitude to Universiti Teknologi MARA for fund (0141903) and facility support.
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Chachuli, S.H.M., Nawaz, A., Shah, K. et al. In Vitro Investigation of Influences of Chitosan Nanoparticles on Fluorescein Permeation into Alveolar Macrophages. Pharm Res 33, 1497–1508 (2016). https://doi.org/10.1007/s11095-016-1893-5
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DOI: https://doi.org/10.1007/s11095-016-1893-5