Author : Kwun-Wai Dede Man
Publisher : Open Dissertation Press
ISBN 13 : 9781361024140
Total Pages : 136 pages
Book Rating : 4.0/5 (241 download)
Book Synopsis OLEANOLIC ACID DELIVERY USING by : Kwun-Wai Dede Man
Download or read book OLEANOLIC ACID DELIVERY USING written by Kwun-Wai Dede Man and published by Open Dissertation Press. This book was released on 2017-01-26 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Oleanolic Acid Delivery Using Biodegradable Nanoparticles for Cancer Therapy" by Kwun-wai, Dede, Man, 文冠慧, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Utilization of nanocarriers is having a significant impact on the diagnosis and treatment of cancer. It allows targeted administration to specific sites and sustained drug delivery. Therefore, this regimen greatly increases the therapeutic index and drug concentration in tumor tissues. Among all types, biomaterials-based nanocarriers, owing to their biocompatible nature, offers a potentially safer strategy to improve the survival of cancer patients. This thesis investigated the therapeutic activity of copolymeric nanoparticulate systems encapsulated with oleanolic acid (OA). Four types of biodegradable copolymers, namely, mPEG-P(D, L)LA, mPEG-P(L)LA, mPEG-P(D, L)LGA and mPEG-P(L)LGA, were employed to fabricate OA-loaded nanoparticles (OA-NPs) by nanoprecipitation. Physicochemical characterizations were performed using dynamic light scattering (DLS), transmission electron microscope(TEM)and high performance liquid chromatography (HPLC). Cytotoxicity of the formulations was evaluated on A549 (human alveolar carcinoma), HepG2 (human liver carcinoma) and BEAS-2B (normal bronchial epithelial) cells via 3-(4, 5-dimethylthiazolyl-2)-2, 5- diphenyltetrazolium bromide (MTT) assay. The induced cell death pathway was confirmed by fluorescence-activated cellsorting (FACS) flow cytometry. The synthesized NPs were spherical, with size dimensions of 40-70nm. The particle size increased to 230-260nm after the incorporation of OA. Polydispersity indices of less than 0.3 indicated the narrow size distribution of the negatively charged NPs. OA-NPs in suspension form were stable over 7 days of storage atboth in 4Cand 25C. Significant inhibitory effect was demonstrated by the OA-NPs on A549 and HepG2 cell lines through apoptosis (p mPEG-P(L)LGA > mPEG-P(D, L)LA > mPEG-P(L)LA NPs in decreasing order. The cytotoxic effect of OA-NPs on BEAS-2B cells was less than that on the two other cancer cell lines, while blank NPs (without OA incorporated) exhibited insignificant toxicity on all cell lines. This reflectedthe cytotoxic effect was ascribed to the encapsulated OA rather than the copolymeric NPs. Overall, our studies clearly revealed the specific anti-tumor capability of the developed OA-loaded nanoparticulate systems. DOI: 10.5353/th_b5388008 Subjects: Nanoparticles Drug carriers (Pharmacy) Cancer - Treatment