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Article

Lectin-Grafted PLGA Microcarriers Loaded with Fluorescent Model Drugs: Characteristics, Release Profiles, and Cytoadhesion Studies

Department of Pharmaceutical Technology and Biopharmaceutics, University of Vienna, Althanstrasse 14, 1090, Vienna, Austria
*
Author to whom correspondence should be addressed.
Sci. Pharm. 2014, 82(1), 193-206; https://doi.org/10.3797/scipharm.1312-08
Submission received: 10 December 2013 / Accepted: 8 February 2014 / Published: 8 February 2014

Abstract

PLGA microparticles loaded with three different fluorescent model drugs, fluorescein sodium (hydrophilic), sulforhodamine (amphoteric), and boron-dipyrromethene (BODIPY® 493/503, lipophilic), were prepared by the solvent evaporation technique. Due to varying hydrophilicity, the diameters of the microparticles ranged between 4.1 and 4.7 μm. According to fluorimetric analysis, the loading varied from 0.06 to 2.25 μg of the model drug per mg PLGA. In terms of the release profile, the fluorescein sodium-entrapped formulation exhibited thermo-responsive release kinetics. In the case of sulforhodamine- and BODIPY® 493/503-loaded particles, almost no release was observed, neither at 4°C nor 37°C during the first 50 hours. Furthermore, to estimate the bioadhesive properties of such drug delivery systems, the surface of the loaded particles was grafted with wheat germ agglutinin by applying the carbodiimide method. Cytoadhesion studies with Caco-2 monolayers revealed an up to 1.9-fold and 3.6-fold increase in the bioadhesion of the lectin-functionalized, model drug-loaded particles as compared to the albumin- and non-grafted microcarriers, respectively. All in all, the results clearly indicated that the lipophilicity of the polymer matching that of the drug favored entrapment, whereas mismatching impeded loading into the PLGA-microparticles. Even in the case of low loading, these delivery systems might be useful for the fluorescent detections and microscopic imaging of cellular interactions due to their fluorescent properties and lack of dye leakage. Moreover, lectin grafting can mediate bioadhesive properties to such particulate drug carriers which could be a promising approach to improve drug delivery.
Keywords: Caco-2; Cytoadhesion; Microparticles; PLGA; Wheat Germ Agglutinin (WGA) Caco-2; Cytoadhesion; Microparticles; PLGA; Wheat Germ Agglutinin (WGA)

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MDPI and ACS Style

WANG, X.-Y.; KOLLER, R.; WIRTH, M.; GABOR, F. Lectin-Grafted PLGA Microcarriers Loaded with Fluorescent Model Drugs: Characteristics, Release Profiles, and Cytoadhesion Studies. Sci. Pharm. 2014, 82, 193-206. https://doi.org/10.3797/scipharm.1312-08

AMA Style

WANG X-Y, KOLLER R, WIRTH M, GABOR F. Lectin-Grafted PLGA Microcarriers Loaded with Fluorescent Model Drugs: Characteristics, Release Profiles, and Cytoadhesion Studies. Scientia Pharmaceutica. 2014; 82(1):193-206. https://doi.org/10.3797/scipharm.1312-08

Chicago/Turabian Style

WANG, Xue-Yan, Romana KOLLER, Michael WIRTH, and Franz GABOR. 2014. "Lectin-Grafted PLGA Microcarriers Loaded with Fluorescent Model Drugs: Characteristics, Release Profiles, and Cytoadhesion Studies" Scientia Pharmaceutica 82, no. 1: 193-206. https://doi.org/10.3797/scipharm.1312-08

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