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Int. J. Mol. Sci. 2014, 15(4), 6241-6251;

Preparation of Lung-Targeting, Emodin-Loaded Polylactic Acid Microspheres and Their Properties

State Key Laboratory of Respiratory Diseases, the First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou 510230, China
Department of Pharmacology, College of Pharmacy, Third Military Medical University, Chongqing 400038, China
School of Traditional Chinese Medicine, Southern Medical University, Guangzhou 510515, China
Department of Dematology, Daping Hospital, Third Military Medical University, Chongqing 400042, China
Author to whom correspondence should be addressed.
Received: 17 February 2014 / Revised: 28 March 2014 / Accepted: 2 April 2014 / Published: 11 April 2014
(This article belongs to the Section Biochemistry, Molecular and Cellular Biology)
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Emodin (1,3,8-trihydroxy-6-methylanthraquinone) has been identified to have the potential to improve lung fibrosis and lung cancer. To avoid the liver and kidney toxicities and the fast metabolism of emodin, emodin-loaded polylactic acid microspheres (ED-PLA-MS) were prepared and their characteristics were studied. ED-PLA-MS were prepared by the organic phase dispersion-solvent diffusion method. By applying an orthogonal design, our results indicated that the optimal formulation was 12 mg/mL PLA, 0.5% gelatin, and an organic phase:glycerol ratio of 1:20. Using the optimal experimental conditions, the drug loading and encapsulation efficiencies were (19.0 ± 1.8)% and (62.2 ± 2.6)%, respectively. The average particle size was 9.7 ± 0.7 μm. In vitro studies indicated that the ED-PLA-MS demonstrated a well-sustained release efficacy. The microspheres delivered emodin, primarily to the lungs of mice, upon intravenous injection. It was also detected by microscopy that partial lung inflammation was observed in lung tissues and no pathological changes were found in other tissues of the ED-PLA-MS-treated animals. These results suggested that ED-PLA-MS are of potential value in treating lung diseases in animals. View Full-Text
Keywords: lung-targeted; emodin; microspheres; polylactic acid; sustained-release lung-targeted; emodin; microspheres; polylactic acid; sustained-release
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Chen, X.; Yang, Z.; Sun, R.; Mo, Z.; Jin, G.; Wei, F.; Hu, J.; Guan, W.; Zhong, N. Preparation of Lung-Targeting, Emodin-Loaded Polylactic Acid Microspheres and Their Properties. Int. J. Mol. Sci. 2014, 15, 6241-6251.

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