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Polysaccharide Submicrocarrier for Improved Pulmonary Delivery of Poorly Soluble Anti-infective Ciprofloxacin: Preparation, Characterization, and Influence of Size on Cellular Uptake
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    Polysaccharide Submicrocarrier for Improved Pulmonary Delivery of Poorly Soluble Anti-infective Ciprofloxacin: Preparation, Characterization, and Influence of Size on Cellular Uptake
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    • Duy-Khiet Ho
      Duy-Khiet Ho
      Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), Helmholtz Center for Infection Research (HZI), Saarland University, D-66123 Saarbrücken, Germany
      Department of Pharmacy, Saarland University, D-66123 Saarbrücken, Germany
      More by Duy-Khiet Ho
    • Ana Costa
      Ana Costa
      I3S, Instituto de Investigação e Inovação em Saúde Universidade do Porto, 4200-135 Porto, Portugal
      Instituto Nacional de Engenharia Biomédica (INEB), Universidade do Porto, 4200-135 Porto, Portugal
      Instituto Ciências Biomédicas Abel Salazar (ICBAS), Universidade do Porto, 4050-313 Porto, Portugal
      More by Ana Costa
    • Chiara De Rossi
      Chiara De Rossi
      Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), Helmholtz Center for Infection Research (HZI), Saarland University, D-66123 Saarbrücken, Germany
    • Cristiane de Souza Carvalho-Wodarz
      Cristiane de Souza Carvalho-Wodarz
      Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), Helmholtz Center for Infection Research (HZI), Saarland University, D-66123 Saarbrücken, Germany
    • Brigitta Loretz*
      Brigitta Loretz
      Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), Helmholtz Center for Infection Research (HZI), Saarland University, D-66123 Saarbrücken, Germany
      *E-mail: [email protected]
    • Claus-Michael Lehr
      Claus-Michael Lehr
      Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), Helmholtz Center for Infection Research (HZI), Saarland University, D-66123 Saarbrücken, Germany
      Department of Pharmacy, Saarland University, D-66123 Saarbrücken, Germany
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    Molecular Pharmaceutics

    Cite this: Mol. Pharmaceutics 2018, 15, 3, 1081–1096
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    https://doi.org/10.1021/acs.molpharmaceut.7b00967
    Published February 9, 2018
    Copyright © 2018 American Chemical Society

    Abstract

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    The majority of the currently used and developed anti-infectives are poorly water-soluble molecules. The poor solubility might lead to limited bioavailability and pharmacological action of the drug. Novel pharmaceutical materials have thus been designed to solve those problems and improve drug delivery. In this study, we propose a facile method to produce submicrocarriers (sMCs) by electrostatic gelation of anionic ß-cyclodextrin (aß-CD) and chitosan. The average hydrodynamic size ranged from 400 to 900 nm by carefully adjusting polymer concentrations and N/C ratio. The distinct host–guest reaction of cyclodextrin derivative is considered as a good approach to enhance solubility, and prevent drug recrystallization, and thus was used to develop sMC to improve the controlled release profile of a poorly soluble and clinically relevant anti-infective ciprofloxacin. The optimal molar ratio of ciprofloxacin to aß-CD was found to be 1:1, which helped maximize encapsulation efficiency (∼90%) and loading capacity (∼9%) of ciprofloxacin loaded sMCs. Furthermore, to recommend the future application of the developed sMCs, the dependence of cell uptake on sMCs size (500, 700, and 900 nm) was investigated in vitro on dTHP-1 by both flow cytometry and confocal microscopy. The results demonstrate that, regardless of their size, an only comparatively small fraction of the sMCs were taken up by the macrophage-like cells, while most of the carriers were merely adsorbed to the cell surface after 2 h incubation. After continuing the incubation to reach 24 h, the majority of the sMCs were found intracellularly. However, the sMCs had been designed to release sufficient amount of drug within 24 h, and the subsequent phagocytosis of the carrier may be considered as an efficient pathway for its safe degradation and elimination. In summary, the developed sMC is a suitable system with promising perspectives recommended for pulmonary extracellular infection therapeutics.

    Copyright © 2018 American Chemical Society

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    Supporting Information

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    The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.molpharmaceut.7b00967.

    • Cell culture procedure; synthesis of green-fluorescent chitosan; summarized results of sMC preparation; summarized results of Cipro loaded sMC preparation; calibration curve of ciprofloxacin concentrations; 1H NMR spectra of ß-CD and aß-CD; FTIR spectra of ß-CD and aß-CD; FTIR spectra of 4-chloro-7-nitrobenzofurazan, chitosan, and green fluorescent labeled chitosan; FTIR spectra of ciprofloxacin, anionic β-cyclodextrin, and inclusion complex of aß-CD_Cipro; different magnifications of SEM images of Cipro crystal, and aß-CD_Cipro amorphous powder; summarized results of Cipro loaded sMC characteristics; summarized results of EE and LC from Cipro loaded sMC; MTT assay performed on dTHP-1 cells; MTT assay performed on NCI-H441 cells; MTT assay performed on hAELVi cells; summarized results of stability test of sMC analyzed by Zetasizer Nano; suggested sMC surface structure; summarized results from FC study (PDF)

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    Molecular Pharmaceutics

    Cite this: Mol. Pharmaceutics 2018, 15, 3, 1081–1096
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acs.molpharmaceut.7b00967
    Published February 9, 2018
    Copyright © 2018 American Chemical Society

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