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KMID : 0369820110410030185
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Jorunal of Korean Pharmaceutical Sciences
2011 Volume.41 No. 3 p.185 ~ p.190
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Phagocytic Uptake of Surface modified PLGA Microspheres Using Dendritic Cell
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Kim Ji-Seon
Lee Young-Sung
Lee Jung-Gil
Park Jeong-Sook
Chung Youn-Bok
Han Kun
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Abstract
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The purpose of this study was to evaluate the phagocytic uptake of surface modified PLGA microspheres containing ovalbumin (OVA) into dendritic cell. In order to find the most suitable formulation for targeted delivery to antigen presenting cells (APC), OVA was encapsulated by a double emulsion solvent evaporation method with three PLGA microspheres (PLGA 50:50, PLGA 75:25 and PLGA 85:15) and two surface modified microspheres by chitosan and sodium dodecyl sulfate (SDS). Physicochemical properties were evaluated in terms of size, zeta potential, encapsulation efficiency, different scanning calorimeter (DSC), x-ray diffraction, morphology, and OVA release test from microspheres. Phagocytic activity was estimated using dendritic cells and analyzed by fluorescence activated cell sorter (FACS). The result showed that zeta potential of PLGA particles was changed to positive by the chitosan modification. The release profile of chitosan modified PLGA microspheres exhibited sustained release after initial burst. The chitosan modified microspheres had higher phagocytic uptake than the other microspheres. Such physicochemical properties and phagocytic uptake studies lead us to conclude that chitosan modified microspheres is more suitable formulation for the targeted delivery of antigens to APC compared with the other microspheres.
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KEYWORD
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PLGA microsphere, Chitosan modified, Dendritic cell, Phagocytic uptake
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