title: Preparation of lung-targeting, emodin-loaded polylactic acid microspheres and their properties.
abstract: 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.
authors.affiliation: State Key Laboratory of Respiratory Diseases, the First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou 510230, China. pharmacxh@yahoo.com.
authors.forename: Xiaohong
authors.initials: X
authors.lastname: Chen
authors.affiliation: State Key Laboratory of Respiratory Diseases, the First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou 510230, China. jeffyah@hotmail.com.
authors.forename: Zifeng
authors.initials: Z
authors.lastname: Yang
authors.affiliation: Department of Dematology, Daping Hospital, Third Military Medical University, Chongqing 400042, China. pharsunr@126.com.
authors.forename: Renshan
authors.initials: R
authors.lastname: Sun
authors.affiliation: State Key Laboratory of Respiratory Diseases, the First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou 510230, China. moziyao@163.net.
authors.forename: Ziyao
authors.initials: Z
authors.lastname: Mo
authors.affiliation: State Key Laboratory of Respiratory Diseases, the First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou 510230, China. hispring112233@163.com.
authors.forename: Guangyao
authors.initials: G
authors.lastname: Jin
authors.affiliation: School of Traditional Chinese Medicine, Southern Medical University, Guangzhou 510515, China. awag7674@fimmu.com.
authors.forename: Fenghuan
authors.initials: F
authors.lastname: Wei
authors.affiliation: State Key Laboratory of Respiratory Diseases, the First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou 510230, China. hujming1972@163.com.
authors.forename: Jianmin
authors.initials: J
authors.lastname: Hu
authors.affiliation: State Key Laboratory of Respiratory Diseases, the First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou 510230, China. wenda@gird.cn.
authors.forename: Wenda
authors.initials: W
authors.lastname: Guan
authors.affiliation: State Key Laboratory of Respiratory Diseases, the First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou 510230, China. nanshan@vip.163.com.
authors.forename: Nanshan
authors.initials: N
authors.lastname: Zhong
mesh_terms: D000818:Animals; D004337:Drug Carriers / Q000737:chemistry; D004642:Emodin / Q000008:administration & dosage / Q000737:chemistry* / Q000493:pharmacokinetics; D005780:Gelatin / Q000737:chemistry; D007275:Injections, Intravenous; D019344:Lactic Acid / Q000737:chemistry*; D008171:Lung Diseases / Q000188:drug therapy; D008175:Lung Neoplasms / Q000188:drug therapy; D051379:Mice; D008810:Mice, Inbred C57BL; D008863:Microspheres; D011091:Polyesters; D011108:Polymers / Q000737:chemistry*; D047428:Protein Kinase Inhibitors / Q000008:administration & dosage / Q000737:chemistry* / Q000493:pharmacokinetics; D013696:Temperature; D014018:Tissue Distribution
chemical_list: D004337:Drug Carriers; D011091:Polyesters; D011108:Polymers; D047428:Protein Kinase Inhibitors; D019344:Lactic Acid; C033616:poly(lactide); D005780:Gelatin; D004642:Emodin
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