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Antioxidant and Immunomodulatory Activities and Structural Characterization of Polysaccharides Isolated from Lobelia Chinensis Lour

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Antioxidant and Immunomodulatory Activities and Structural Characterization of Polysaccharides Isolated from Lobelia Chinensis Lour OPEN ACCESS Pharmacologia ISSN 2044-4648 DOI: 10.5567/pharmacologia.2018.157.168 Research Article Antioxidant and Immunomodulatory Activities and Structural Characterization of Polysaccharides Isolated from Lobelia chinensis Lour 1Lin Zhang, 1Narsimha Reddy, 2Cheang Soo Khoo, 3,4Sundar Rao Koyyalamudi and 1Christopher E. Jones 1School of Science and Health, Parramatta Campus, Western Sydney University, Locked Bag 1797, Penrith NSW 2751, Australia 2WentworthInstitute, 302-306 Elizabeth Street, Surry Hills, NSW 2010, Australia 3Institute of Endocrinology and Diabetes, The Children’s Hospital at Westmead, Sydney, NSW 2145, Australia 4Discipline of Paediatrics and Child Health, The Children’s Hospital at Westmead, The University of Sydney, Sydney, NSW 2145, Australia Abstract Background and Objective: Lobelia chinensis Lour is an important anticancer herb used in traditional Chinese medicine. Many botanical polysaccharides are known to exhibit immunomodulatory and anticancer activities. This research aimed to analyze the L. chinensis polysaccharides (LCPs) for their biological activities relevant to their anticancer function. Materials and Methods: Water-soluble LCPs were extracted and purified using size-exclusion chromatography to obtain two dominant polysaccharides, LCP-1 and LCP-2 having molecular masses of 1899 kDa and 5.3 kDa, respectively. The antioxidant potentials of the isolated polysaccharides were evaluated by measuring radical scavenging activities against DPPHC (2,2-diphenyl-1-picrylhydrazyl radical), ABTSC+(2,2'-azino-bis(3-ethylbenzothiazoline- 6-sulphonic acid radical) and OHC (hydroxyl radical). Immunostimulatory activities of LCP-1 and LCP-2 were measured using mouse macrophages. Structure of the most active fraction (LCP-2) was determined using FT-IR and NMR spectroscopic techniques. Results: Two isolated polysaccharide fractions displayed significant antioxidant activities and stimulated the production of tumor necrosis factor-" (TNF-") and interleukin-6 (IL-6), although LCP-2 is more effective. Detailed structural characterization by FT-IR and NMR was undertaken for the most active fraction (LCP-2) and confirmed that LCP-2 is(2,1)-$-fructan. Conclusion: The results suggested that the polysaccharides isolated from Lobelia chinensis Lour are potential candidates for immune-chemotherapy and suitable for the treatment of cancer. Key words: Lobelia chinensis Lour, polysaccharides, immunostimulatory effects, antioxidant activities, FT-IR spectroscopy, NMR spectroscopy Citation: Lin Zhang, Narsimha Reddy, Cheang Soo Khoo, Sundar Rao Koyyalamudi and Christopher E Jones, 2018. Antioxidant and immunomodulatory activities and structural characterization of polysaccharides isolated from Lobelia chinensis Lour. Pharmacologia, 9: 157-168. Corresponding Author: Narsimha Reddy, School of Science and Health, Parramatta Campus, Western Sydney University, Locked Bag 1797, Penrith NSW 2751, Australia Tel: (02) 9685 9925 Fax:(02) 9685 9915 Copyright: © 2018 Lin Zhang et al. This is an open access article distributed under the terms of the creative commons attribution License, which permits unrestricted use, distribution and reproduction in any medium, provided the original author and source are credited. Competing Interest: The authors have declared that no competing interest exists. Data Availability: All relevant data are within the paper and its supporting information files. Pharmacologia 9 (4): 157-168, 2018 INTRODUCTION MATERIALS AND METHODS Lobelia chinensis Lour (Campanulaceae) is an important This research was carried out between March 2015 to anticancer herb which has been widely used as diuretic, November 2017 as part of the program for the discovery of hemostat, antidote and anticancer agent in Traditional novel anticancer agents in Authors’ Laboratory. Chinese Medicine (TCM) for decades1,2. This herb is used in several traditional anticancer formulations to treat gastric Procurement of medicinal plant associated with this 1,3 cancer, lung cancer, colorectal cancer and liver cancer . research: Lobelia chinensis Lour was purchased from Bei Jing Modern scientific studies revealed that L. chinensis contains Tong Ren Tang, a Chinese Herbal Medical Centre located in several important classes of bioactive compounds such as Sydney (Australia). This company has branches all over the piperidine alkaloids, flavonoids, terpenoids and coumarins4-6. world and is well known for their best practice in TCM. The Several studies demonstrated that the extracts from this herb herbs traded in Sydney centre have approvals from both displayed a number of pharmacological activities such as Australian and Chinese Governments. The company antibacterial, anti-venom and anticancer activities4-6. The hot undertakes stringent authentication and quality control water extracts (decoction) from L. chinensis have been shown procedures for all the herbal materials supplied by them. to display significant immunostimulatory and anticancer properties against liver cancer (H22) and Gastric cancer Chemicals and materials: The 2,2-diphenyl-1-picrylhydrazyl (BC-38)4,7,8. Preliminary scientific studies from authors’ (DPPH), 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulphonic laboratory indicated that the water extracts from L. chinensis acid) (ABTS), dimethyl sulfoxide (DMSO), 1,10-phenanthroline, have shown high antioxidant and immunostimulatory H O , ferrozine, 95% ethanol, ascorbic acid, sulfanilamide, activities9-11. However, the literature on the polysaccharides 2 2 N-(1-1-napthyl) ethylenediamine dihydrochloride, from L. chinensis and their characterization is very limited1. lipopolysaccharide (LPS) were purchased from Sigma Literature demonstrates that botanical polysaccharides (Australia) and Lomb Scientific Pvt., Ltd. (Australia). The Foetal exhibit a variety of pharmacological activities that include Bovine Serum (FBS), antibiotics and Dulbecco’s modified anticancer, immune regulation and antioxidant activities12-21. Eagle’s medium (DMEM) with gluMax were purchased from BD In recent decades, herbal polysaccharides are proving to be Bioscience (USA). The tumour necrosis factor-" (TNF-") and ideal candidates for anticancer agents due to their relevant interleukin (IL-6) (mouse)-ELISA standards and antibodies biological activities with minimal side effects1,14,21-26. Many were purchased from BD Bioscience (USA). Mouse polysaccharides such as lentinan, Polysaccharide Krestin (PSK), macrophage cells (RAW 264.7) were purchased from Sigma- Polysaccharopeptide (PSP) and schizophyllan, isolated from Aldrich. medicinal mushrooms are in clinical use as anticancer agents due to their excellent anticancer properties along with Extraction and fractionation of polysaccharides from immuno-regulatory effects12-14,21,27. Therefore, it is of enormous interest to study polysaccharides from traditional herbs that L. chinensis: To extract water-soluble compounds, 25 g are promising candidates to develop novel therapeutics for of L. chinensis Lour was powdered then autoclaved (121EC, the treatment of cancer as well as immune-regulation. To the 2 h). The extract was cooled to laboratory temperature and the best of our knowledge there is only one publication involving supernatant was separated by filtration and then crude isolation of an "-Glucan from L. chinensis that displayed compounds were precipitated by treating the supernatant significant immunostimulatory activity1. with 95% ethanol (Fig. 1). The isolated polysaccharides were It is known in the literature that the plant extracts which de-proteinated using Sevag method21 and purified using show antioxidant and immunomodulatory potential, gel filtration (Sepharose CL-6B; 2.4×99 cm, flow rate: concurrently exhibit anticancer effects14,17,19-21,28-31. Therefore, 0.51 mL minG1). Details of the procedure followed for the the screening for potential immunomodulators is one of the extraction and purification of polysaccharides is similar to important steps for the development of anticancer that published previously16,17,19-21 and described in Fig. 1. therapeutics. Hence, the objectives of this study were to Polysaccharide fractions were obtained based on the sugar isolate polysaccharides from L. chinensis and evaluate their profile of the eluted samples19-21. These fractions were antioxidant and immunostimulatory activities. It is also aimed collected, freeze-dried and then kept at -20EC until further to carry out structural characterization of L. chinensis studies. polysaccharides using FT-IR and NMR spectroscopic techniques with a view to understand structure-activity Determination of average molecular mass: Molecular relationship. weights of these fractions were determined by calibrating the 158 Pharmacologia 9 (4): 157-168, 2018 Powdered plant material C Hot water extraction (autoclaving) (121°C for 2 h) C Centrifugation (10,000 rpm for 20 min) Marc Water supernatant C Precipitation using 95% EtOH (Volume: Volume = 1:4 for 24 h) C Centrifuge (10,000 rpm for 20 min) C Freeze dry Crude biopolymer C Sevag reagent (1:5 v/v) C Vo t e x 20 m i n C C e ntrifuge (5000 rpm for 15 min) Precipitation using 95% EtOH (Volume:Volume (1:4v/v)) C Centrifuge (10,000 rpm for 20 min) C Freeze dry Crude polysaccharides Fractionation using CL-6B size chromatography column LCP-1 LCP-2 Fig. 1: Flow chart for the extraction of polysaccharides from L. chinensis Sepharose CL-6B gel filtration column. Standard dextrans with determine the bound protein. Regression of the standard average molecular weight (from 2000 to 1 kDa) were used to curve
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