Serveur d'exploration Chloroquine

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Alveolar macrophage cell line is not activated by exposure to polymeric microspheres

Identifieur interne : 002841 ( Main/Exploration ); précédent : 002840; suivant : 002842

Alveolar macrophage cell line is not activated by exposure to polymeric microspheres

Auteurs : Ka-Yun Ng [États-Unis] ; Kathleen A. Stringer [États-Unis] ; Zoe Cohen [États-Unis] ; Robert Serravo [États-Unis] ; Bin Tian [États-Unis] ; Jeffrey D. Meyer [États-Unis] ; Richard Falk [États-Unis] ; Theodore Randolph [États-Unis] ; Mark C. Manning [États-Unis] ; David C. Thompson [États-Unis]

Source :

RBID : ISTEX:35C565B5CF0706547DC94D5F27F45E742E40D1D6

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English descriptors

Abstract

Abstract: An in vitro cell culture model based on a rat alveolar macrophage (AM) cell line, NR8383, was used to determine if poly(l-lactide) (PLA) microspheres prepared by the precipitation with a compressed antisolvent (PCA) method can be taken up by AMs and activate AMs. To examine cellular uptake of microspheres, microspheres were labeled with rhodamine 6G. Using fluorescence microscopy, the uptake of microspheres by NR8383 cells was followed as a function of time, microsphere concentration, and susceptibility to lysosomotropic agents. To determine if microspheres can activate NR8383 cells, the oxidative burst and production of TNF-α by NR8383 cells following microsphere treatment was measured. Uptake of microspheres by NR8383 cells was dependent on microsphere concentration and appeared to occur via endocytosis, as uptake was significantly inhibited by the putative lysosomotropic agents, ammonium chloride and chloroquine. Furthermore, the microspheres do not appear to activate NR8383 cells, since microsphere exposure results in negligible oxidative burst and TNF-α production in NR8383. Microspheres prepared by the PCA method hold great potential in targeting drugs to AMs and, therefore, may be of utility for the treatment of diseases in which AMs play an important role, such as tuberculosis (TB).

Url:
DOI: 10.1016/S0378-5173(98)00138-0


Affiliations:


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<term>Activation</term>
<term>Alveolar macrophage</term>
<term>Animal</term>
<term>Biological fixation</term>
<term>Control release polymer</term>
<term>Dosage form</term>
<term>Drug carrier</term>
<term>Endocytosis</term>
<term>Established cell line</term>
<term>Lactic acid polymer</term>
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<term>Oxidative burst and TNF-α</term>
<term>Pharmaceutical technology</term>
<term>Poly(l-lactide) microsphere</term>
<term>Precipitation</term>
<term>Precipitation with compressed anti-solvent</term>
<term>Pulmonary alveolus</term>
<term>Rat</term>
<term>Respiratory system</term>
<term>Targeting</term>
<term>Tumor necrosis factor α</term>
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<term>Activation</term>
<term>Alvéole pulmonaire</term>
<term>Animal</term>
<term>Appareil respiratoire</term>
<term>Ciblage</term>
<term>Endocytose</term>
<term>Facteur nécrose tumorale α</term>
<term>Fixation biologique</term>
<term>Forme pharmaceutique</term>
<term>Lactique acide polymère</term>
<term>Lignée cellulaire établie</term>
<term>Macrophage</term>
<term>Microsphère</term>
<term>Polymère vecteur</term>
<term>Précipitation</term>
<term>Rat</term>
<term>Technologie pharmaceutique</term>
<term>Vecteur médicament</term>
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<term>Alveolar macrophage cell line</term>
<term>Alveolar macrophages</term>
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<term>Antitubercular drugs</term>
<term>Cell association</term>
<term>Cell incubator</term>
<term>Cell line</term>
<term>Cells rinsed</term>
<term>Cellular uptake</term>
<term>Chloride solution</term>
<term>Chloroquine</term>
<term>Cluster plate</term>
<term>Colorado health sciences center</term>
<term>Culture medium</term>
<term>Different concentrations</term>
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<term>Drug therapy</term>
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<term>Endocytosis</term>
<term>Free rhodamine</term>
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<term>Oxidant production</term>
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<term>Oxidative burst</term>
<term>Oxidative metabolism</term>
<term>Particle cell interaction</term>
<term>Pharmaceutics</term>
<term>Pulmonary delivery</term>
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<term>Rhodamine microspheres</term>
<term>Scanning electron micrograph</term>
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<div type="abstract" xml:lang="en">Abstract: An in vitro cell culture model based on a rat alveolar macrophage (AM) cell line, NR8383, was used to determine if poly(l-lactide) (PLA) microspheres prepared by the precipitation with a compressed antisolvent (PCA) method can be taken up by AMs and activate AMs. To examine cellular uptake of microspheres, microspheres were labeled with rhodamine 6G. Using fluorescence microscopy, the uptake of microspheres by NR8383 cells was followed as a function of time, microsphere concentration, and susceptibility to lysosomotropic agents. To determine if microspheres can activate NR8383 cells, the oxidative burst and production of TNF-α by NR8383 cells following microsphere treatment was measured. Uptake of microspheres by NR8383 cells was dependent on microsphere concentration and appeared to occur via endocytosis, as uptake was significantly inhibited by the putative lysosomotropic agents, ammonium chloride and chloroquine. Furthermore, the microspheres do not appear to activate NR8383 cells, since microsphere exposure results in negligible oxidative burst and TNF-α production in NR8383. Microspheres prepared by the PCA method hold great potential in targeting drugs to AMs and, therefore, may be of utility for the treatment of diseases in which AMs play an important role, such as tuberculosis (TB).</div>
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