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Yang F, Su Y, Yan C, Chen T, Cheung PCK. Attenuation of inflammatory bowel disease by oral administration of mucoadhesive polydopamine-coated yeast β-glucan via ROS scavenging and gut microbiota regulation. J Nanobiotechnology 2024; 22:166. [PMID: 38610032 PMCID: PMC11010398 DOI: 10.1186/s12951-024-02434-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2023] [Accepted: 03/22/2024] [Indexed: 04/14/2024] Open
Abstract
Treatment for inflammatory bowel disease (IBD) is challenging since current anti-inflammatory and immunosuppressive therapies do not address the underlying causes of the illness, which include increased levels of reactive oxygen species (ROS) and dysbiosis of the gut commensal microbiota. Additionally, these treatments often have systemic off-target effects and adverse side effects. In this study, we have developed a prebiotic yeast β-glucan nanocomplex coated with bio-adhesive polydopamine (YBNs@PDA) to effectively prolong their retention time in the gastrointestinal (GI) tract. The oral administration of YBNs@PDA restored the epithelium barriers, reduced ROS levels, and minimized systemic drug exposure while improved therapeutic efficacy in an acute colitis mouse model. Furthermore, 16S ribosomal RNA genes sequencing demonstrated a higher richness and diversity in gut microflora composition following the treatments. In particular, YBNs@PDA markedly augmented the abundance of Lachnospiraceae NK4A136 and Bifidobacterium, both of which are probiotics with crucial roles in relieving colitis via retaining gut homeostasis. Cumulatively, these results demonstrate that the potential of YBNs@PDA as a novel drug-free, ROS-scavenging and gut microbiota regulation nanoplatform for the treatment of GI disorders.
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Affiliation(s)
- Fan Yang
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - Yuting Su
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - Chi Yan
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - Tianfeng Chen
- College of Chemistry and Materials Science, Jinan University, Guangzhou, China
| | - Peter Chi Keung Cheung
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
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2
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Kei N, Cheung KK, Ma KL, Yau TK, Lauw S, Wong VWS, You L, Cheung PCK. Effects of Oat β-Glucan and Inulin on Alleviation of Nonalcoholic Steatohepatitis Aggravated by Circadian Disruption in C57BL/6J Mice. J Agric Food Chem 2024; 72:3520-3535. [PMID: 38333950 DOI: 10.1021/acs.jafc.3c08028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/10/2024]
Abstract
This was the first study that examined the effects of oat β-glucan and inulin on diet-induced nonalcoholic steatohepatitis (NASH) in circadian-disrupted (CD)-male C57BL/6J mice. CD intensified NASH, significantly increasing alanine aminotransferase and upregulating hepatic tumor necrosis factor α (TNFα) and transforming growth factor β 1 (TGFβ1). However, these observations were significantly alleviated by oat β-glucan and inulin treatments. Compared to CD NASH mice, oat β-glucan significantly decreased the liver index, aspartate aminotransferase (AST), and insulin. In prebiotic-treated and CD NASH mice, significant negative correlations were found between enrichment of Muribaculaceae bacterium Isolate-036 (Harlan), Muribaculaceae bacterium Isolate-001 (NCI), and Bacteroides ovatus after oat β-glucan supplementation with TNFα and TGFβ1 levels; and enrichment of Muribaculaceae bacterium Isolate-110 (HZI) after inulin supplementation with AST level. In conclusion, oat β-glucan and inulin exhibited similar antiliver injury, anti-inflammatory, and antifibrotic activities but had no effect on cecal short-chain fatty acids and gut microbiota diversity in CD NASH mice.
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Affiliation(s)
- Nelson Kei
- Food and Nutritional Sciences Program, School of Life Sciences, The Chinese University of Hong Kong, New Territories, Hong Kong SAR, China
| | - Kam Kuen Cheung
- Food and Nutritional Sciences Program, School of Life Sciences, The Chinese University of Hong Kong, New Territories, Hong Kong SAR, China
- Food Research Centre, The Chinese University of Hong Kong, New Territories, Hong Kong SAR , China
| | - Ka Lee Ma
- Food and Nutritional Sciences Program, School of Life Sciences, The Chinese University of Hong Kong, New Territories, Hong Kong SAR, China
| | - Tsz Kwan Yau
- Cell and Molecular Biology Program, School of Life Sciences, The Chinese University of Hong Kong, New Territories, Hong Kong SAR, China
| | - Susana Lauw
- Food and Nutritional Sciences Program, School of Life Sciences, The Chinese University of Hong Kong, New Territories, Hong Kong SAR, China
- Food Research Centre, The Chinese University of Hong Kong, New Territories, Hong Kong SAR , China
| | - Vincent Wai Sun Wong
- Department of Medicine and Therapeutics, The Chinese University of Hong Kong, New Territories, Hong Kong SAR, China
| | - Lijun You
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, China
| | - Peter Chi Keung Cheung
- Food and Nutritional Sciences Program, School of Life Sciences, The Chinese University of Hong Kong, New Territories, Hong Kong SAR, China
- Food Research Centre, The Chinese University of Hong Kong, New Territories, Hong Kong SAR , China
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Ma KL, Kei N, Yang F, Lauw S, Chan PL, Chen L, Cheung PCK. In Vitro Fermentation Characteristics of Fungal Polysaccharides Derived from Wolfiporia cocos and Their Effect on Human Fecal Microbiota. Foods 2023; 12:4014. [PMID: 37959133 PMCID: PMC10648267 DOI: 10.3390/foods12214014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2023] [Revised: 10/16/2023] [Accepted: 10/31/2023] [Indexed: 11/15/2023] Open
Abstract
Gut microbiota has been described as a new 'organ' that interferes with host physiology by its metabolites produced from the utilization and biotransformation of undigested food components. Fu Ling (FL), the sclerotia of fungi Wolfiporia cocos, contains β-glucan, which is a known natural polysaccharide with strong medicinal efficacy. This study endeavors to evaluate the fermentability of FL and polysaccharides extracted from its sclerotia. An in vitro fermentation of structurally characterized FL and its β-glucan by human fecal microbiota was conducted. Total bacterial count, pH change, short-chain fatty acid profile and microbiota profile were assessed post-fermentation. FL containing over 70% of β-(1 → 3) and (1 → 6)-glucans with a low degree of branching of 0.24 could enhance acetic acid (a major microbial metabolite) production. Both FL and its extracted β-glucan had similar modulation on microbial composition. They enriched Phascolarctobacterium faecium, Bacteroides dorei and Parabacteroides distasonis, all of which are shown to possess anti-inflammatory effects. FL polysaccharide can be utilized as a natural whole food for its potential health benefits to human gut bacteria.
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Affiliation(s)
- Ka Lee Ma
- Food and Nutritional Sciences Program, School of Life Sciences, The Chinese University of Hong Kong, Hong Kong SAR, China; (K.L.M.); (N.K.); (S.L.); (P.L.C.)
| | - Nelson Kei
- Food and Nutritional Sciences Program, School of Life Sciences, The Chinese University of Hong Kong, Hong Kong SAR, China; (K.L.M.); (N.K.); (S.L.); (P.L.C.)
| | - Fan Yang
- Biochemistry Program, School of Life Sciences, The Chinese University of Hong Kong, Hong Kong SAR, China;
| | - Susana Lauw
- Food and Nutritional Sciences Program, School of Life Sciences, The Chinese University of Hong Kong, Hong Kong SAR, China; (K.L.M.); (N.K.); (S.L.); (P.L.C.)
| | - Po Lam Chan
- Food and Nutritional Sciences Program, School of Life Sciences, The Chinese University of Hong Kong, Hong Kong SAR, China; (K.L.M.); (N.K.); (S.L.); (P.L.C.)
| | - Lei Chen
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China;
- National Engineering Research Center of Cereal Fermentation and Food Biomanufacturing, Jiangnan University, Wuxi 214122, China
| | - Peter Chi Keung Cheung
- Food and Nutritional Sciences Program, School of Life Sciences, The Chinese University of Hong Kong, Hong Kong SAR, China; (K.L.M.); (N.K.); (S.L.); (P.L.C.)
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Lauw S, Kei N, Chan PL, Yau TK, Ma KL, Szeto CYY, Lin JSC, Wong SH, Cheung PCK, Kwan HS. Effects of Synbiotic Supplementation on Metabolic Syndrome Traits and Gut Microbial Profile among Overweight and Obese Hong Kong Chinese Individuals: A Randomized Trial. Nutrients 2023; 15:4248. [PMID: 37836532 PMCID: PMC10574554 DOI: 10.3390/nu15194248] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2023] [Revised: 09/29/2023] [Accepted: 09/29/2023] [Indexed: 10/15/2023] Open
Abstract
In view of the limited evidence showing anti-obesity effects of synbiotics via modulation of the gut microbiota in humans, a randomized clinical trial was performed. Assessment of the metabolic syndrome traits and profiling of the fecal gut microbiota using 16S rRNA gene sequencing in overweight and obese Hong Kong Chinese individuals before and after dietary intervention with an 8-week increased consumption of fruits and vegetables and/or synbiotic supplementation was conducted. The selected synbiotic contained two probiotics (Lactobacillus acidophilus NCFM and Bifidobacterium lactis HN019) and a prebiotic (polydextrose). Fifty-five overweight or obese individuals were randomized and divided into a synbiotic group (SG; n = 19), a dietary intervention group (DG; n = 18), and a group receiving combined interventions (DSG; n = 18). DSG showed the greatest weight loss effects and number of significant differences in clinical parameters compared to its baseline values-notably, decreases in fasting glucose, insulin, HOMA-IR, and triglycerides and an increase in HDL-cholesterol. DSG lowered Megamonas abundance, which was positively associated with BMI, body fat mass, and trunk fat mass. The results suggested that increasing dietary fiber consumption from fruits and vegetables combined with synbiotic supplementation is more effective than either approach alone in tackling obesity.
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Affiliation(s)
- Susana Lauw
- Food and Nutritional Sciences Program, School of Life Sciences, Faculty of Science, The Chinese University of Hong Kong, Hong Kong SAR, China; (S.L.); (N.K.); (K.L.M.); (P.C.K.C.)
- Food Research Centre, The Chinese University of Hong Kong, Hong Kong SAR, China;
| | - Nelson Kei
- Food and Nutritional Sciences Program, School of Life Sciences, Faculty of Science, The Chinese University of Hong Kong, Hong Kong SAR, China; (S.L.); (N.K.); (K.L.M.); (P.C.K.C.)
| | - Po Lam Chan
- Food Research Centre, The Chinese University of Hong Kong, Hong Kong SAR, China;
- HSK GeneTech Limited, Hong Kong SAR, China;
| | - Tsz Kwan Yau
- Cell and Molecular Biology Program, School of Life Sciences, Faculty of Science, The Chinese University of Hong Kong, Hong Kong SAR, China;
| | - Ka Lee Ma
- Food and Nutritional Sciences Program, School of Life Sciences, Faculty of Science, The Chinese University of Hong Kong, Hong Kong SAR, China; (S.L.); (N.K.); (K.L.M.); (P.C.K.C.)
| | | | - Janice Su-Chuen Lin
- Department of Otorhinolaryngology, Head and Neck Surgery, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong SAR, China;
| | - Sunny Hei Wong
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore 308232, Singapore;
| | - Peter Chi Keung Cheung
- Food and Nutritional Sciences Program, School of Life Sciences, Faculty of Science, The Chinese University of Hong Kong, Hong Kong SAR, China; (S.L.); (N.K.); (K.L.M.); (P.C.K.C.)
- Food Research Centre, The Chinese University of Hong Kong, Hong Kong SAR, China;
| | - Hoi Shan Kwan
- Food Research Centre, The Chinese University of Hong Kong, Hong Kong SAR, China;
- HSK GeneTech Limited, Hong Kong SAR, China;
- ProBioLife Limited, Hong Kong SAR, China
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5
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Kei N, Wong VWS, Lauw S, You L, Cheung PCK. Utilization of Food-Derived β-Glucans to Prevent and Treat Non-Alcoholic Fatty Liver Disease (NAFLD). Foods 2023; 12:3279. [PMID: 37685211 PMCID: PMC10486587 DOI: 10.3390/foods12173279] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2023] [Revised: 08/23/2023] [Accepted: 08/28/2023] [Indexed: 09/10/2023] Open
Abstract
Non-alcoholic fatty liver disease (NAFLD) has become the most common chronic liver disease nowadays. Currently, there is no officially approved drug to treat NAFLD. In view of the increasing global prevalence of NAFLD and an absence of treatments, the development of effective treatments is of utmost importance. β-glucan, a natural bioactive polysaccharide, has demonstrated hepatoprotective effects in NAFLD prevention and treatment. This review solely focuses on gathering the published preclinical animal studies that demonstrated the anti-liver injury, anti-steatotic, anti-inflammatory, anti-fibrotic, and antioxidant activities of β-glucan. The impact of β-glucan on gut microbiota and its metabolites including short-chain fatty acids and bile acids as the underlying mechanism for its bioactive beneficial effect on NAFLD is also explored. Given the limited knowledge of β-glucan on anti-fibrotic activity, bile acid metabolism, and gut microbiota function, additional relevant research is highly encouraged to lay a solid foundation for the use of food-derived β-glucan as a functional food for NAFLD. It is envisaged that further investigation of food-derived β-glucan in human clinical studies should be carried out for its wider utilization.
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Affiliation(s)
- Nelson Kei
- Food and Nutritional Sciences Program, School of Life Sciences, The Chinese University of Hong Kong, Hong Kong SAR, China; (N.K.); (S.L.)
| | - Vincent Wai Sun Wong
- Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Hong Kong SAR, China;
| | - Susana Lauw
- Food and Nutritional Sciences Program, School of Life Sciences, The Chinese University of Hong Kong, Hong Kong SAR, China; (N.K.); (S.L.)
| | - Lijun You
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, China;
| | - Peter Chi Keung Cheung
- Food and Nutritional Sciences Program, School of Life Sciences, The Chinese University of Hong Kong, Hong Kong SAR, China; (N.K.); (S.L.)
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6
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Tam LKB, Lo PC, Cheung PCK, Ng DKP. A Tetrazine-Caged Carbon-Dipyrromethene as a Bioorthogonally Activatable Fluorescent Probe. Chem Asian J 2023; 18:e202300562. [PMID: 37489571 DOI: 10.1002/asia.202300562] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Revised: 07/19/2023] [Accepted: 07/25/2023] [Indexed: 07/26/2023]
Abstract
A water-soluble 1,2,4,5-tetrazine-substituted carbon-dipyrromethene (C-DIPY) was synthesized from the previously reported carbonyl pyrrole dimer through a two-step procedure. Owing to the presence of a tetrazine moiety, the fluorescence emission of this compound was largely quenched in phosphate-buffered saline at pH 7.4. Upon addition of a bicyclo[6.1.0]non-4-yne (BCN) derivative, the tetrazine-based quenching component of the compound was disrupted through the inverse electron-demand Diels-Alder reaction to restore the fluorescence in up to 6.6-fold. This bioorthogonal activation was also demonstrated using U-87 MG human glioblastoma cells, in which the fluorescence intensity of this C-DIPY could be enhanced by 8.7-fold upon post-incubation with the BCN derivative. The results showed that this tetrazine-caged C-DIPY can serve as a bioorthogonally activatable fluorescent probe for bioimaging. The compound, however, was found to reside preferentially in the lysosomes instead of the mitochondria of the cells as predicted based on its cationic character, which could be attributed to its energy-dependent endocytic cellular uptake pathway, for which lysosomes are the end station.
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Affiliation(s)
- Leo K B Tam
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N. T., Hong Kong, China
| | - Pui-Chi Lo
- Department of Biomedical Sciences, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
| | - Peter Chi Keung Cheung
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, N. T., Hong Kong, China
| | - Dennis K P Ng
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N. T., Hong Kong, China
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7
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Yang F, Cheung PCK. Fungal β-Glucan-Based Nanotherapeutics: From Fabrication to Application. J Fungi (Basel) 2023; 9:jof9040475. [PMID: 37108930 PMCID: PMC10143420 DOI: 10.3390/jof9040475] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Revised: 04/12/2023] [Accepted: 04/13/2023] [Indexed: 04/29/2023] Open
Abstract
Fungal β-glucans are naturally occurring active macromolecules used in food and medicine due to their wide range of biological activities and positive health benefits. Significant research efforts have been devoted over the past decade to producing fungal β-glucan-based nanomaterials and promoting their uses in numerous fields, including biomedicine. Herein, this review offers an up-to-date report on the synthetic strategies of common fungal β-glucan-based nanomaterials and preparation methods such as nanoprecipitation and emulsification. In addition, we highlight current examples of fungal β-glucan-based theranostic nanosystems and their prospective use for drug delivery and treatment in anti-cancer, vaccination, as well as anti-inflammatory treatments. It is anticipated that future advances in polysaccharide chemistry and nanotechnology will aid in the clinical translation of fungal β-glucan-based nanomaterials for the delivery of drugs and the treatment of illnesses.
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Affiliation(s)
- Fan Yang
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong 999077, China
| | - Peter Chi Keung Cheung
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong 999077, China
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Tam LKB, Chu JCH, He L, Yang C, Han KC, Cheung PCK, Ng DKP, Lo PC. Enzyme-Responsive Double-Locked Photodynamic Molecular Beacon for Targeted Photodynamic Anticancer Therapy. J Am Chem Soc 2023; 145:7361-7375. [PMID: 36961946 PMCID: PMC10080691 DOI: 10.1021/jacs.2c13732] [Citation(s) in RCA: 17] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/26/2023]
Abstract
An advanced photodynamic molecular beacon (PMB) was designed and synthesized, in which a distyryl boron dipyrromethene (DSBDP)-based photosensitizer and a Black Hole Quencher 3 moiety were connected via two peptide segments containing the sequences PLGVR and GFLG, respectively, of a cyclic peptide. These two short peptide sequences are well-known substrates of matrix metalloproteinase-2 (MMP-2) and cathepsin B, respectively, both of which are overexpressed in a wide range of cancer cells either extracellularly (for MMP-2) or intracellularly (for cathepsin B). Owing to the efficient Förster resonance energy transfer between the two components, this PMB was fully quenched in the native form. Only upon interaction with both MMP-2 and cathepsin B, either in a buffer solution or in cancer cells, both of the segments were cleaved specifically, and the two components could be completely separated, thereby restoring the photodynamic activities of the DSBDP moiety. This PMB could also be activated in tumors, and it effectively suppressed the tumor growth in A549 tumor-bearing nude mice upon laser irradiation without causing notable side effects. In particular, it did not cause skin photosensitivity, which is a very common side effect of photodynamic therapy (PDT) using conventional "always-on" photosensitizers. The overall results showed that this "double-locked" PMB functioned as a biological AND logic gate that could only be unlocked by the coexistence of two tumor-associated enzymes, which could greatly enhance the tumor specificity in PDT.
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Affiliation(s)
- Leo K B Tam
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
| | - Jacky C H Chu
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
| | - Lin He
- Department of Biomedical Sciences and Tung Biomedical Sciences Centre, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
| | - Caixia Yang
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
| | - Kam-Chu Han
- Department of Clinical Pathology, Pamela Youde Nethersole Eastern Hospital, Chai Wan, Hong Kong, China
| | - Peter Chi Keung Cheung
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
| | - Dennis K P Ng
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
| | - Pui-Chi Lo
- Department of Biomedical Sciences and Tung Biomedical Sciences Centre, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
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Chan PL, Lauw S, Ma KL, Kei N, Ma KL, Wong YO, Lam HY, Ting YY, Yau TK, Nong W, Huang D, Xie Y, Cheung PCK, Kwan HS. ProBioQuest: a database and semantic analysis engine for literature, clinical trials and patents related to probiotics. Database (Oxford) 2022; 2022:6645125. [PMID: 35849028 PMCID: PMC9290863 DOI: 10.1093/database/baac059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2022] [Revised: 06/03/2022] [Accepted: 07/04/2022] [Indexed: 11/29/2022]
Abstract
The use of probiotics to improve health via the modulation of gut microbiota has gained wide attention. The growing volume of investigations of probiotic microorganisms and commercialized probiotic products has created the need for a database to organize the health-promoting functions driven by probiotics reported in academic articles, clinical trials and patents. We constructed ProBioQuest to collect up-to-date literature related to probiotics from PubMed.gov, ClinicalTrials.gov and PatentsView. More than 2.8 million articles have been collected. Automated information technology-assisted procedures enabled us to collect the data continuously, providing the most up-to-date information. Statistical functions and semantic analyses are provided on the website as an advanced search engine, which contributes to the semantic tool of this database for information search and analyses. The semantic analytical output provides categorized search results and functions to enhance further analysis. A keyword bank is included which can display multiple tables of contents. Users can select keywords from different displayed categories to achieve easily filtered searches. Additional information on the searched items can be browsed via the link-out function. ProBioQuest is not only useful to scientists and health professionals but also to dietary supplement manufacturers and the general public. In this paper, the method we used to build this database-web system is described. Applications of ProBioQuest for several literature-based analyses of probiotics are included as examples of the various uses of this search engine. ProBioQuest can be accessed free of charge at http://kwanlab.bio.cuhk.edu.hk/PBQ/.
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Affiliation(s)
- Po Lam Chan
- School of Life Sciences, The Chinese University of Hong Kong , Shatin, New Territories, Hong Kong
- HSK GeneTech Limited, Hong Kong Science Park , Shatin, New Territories, Hong Kong
- Food Research Centre, The Chinese University of Hong Kong , Shatin, New Territories, Hong Kong
| | - Susana Lauw
- School of Life Sciences, The Chinese University of Hong Kong , Shatin, New Territories, Hong Kong
| | - Ka Lee Ma
- School of Life Sciences, The Chinese University of Hong Kong , Shatin, New Territories, Hong Kong
| | - Nelson Kei
- School of Life Sciences, The Chinese University of Hong Kong , Shatin, New Territories, Hong Kong
| | - Ka Leong Ma
- School of Life Sciences, The Chinese University of Hong Kong , Shatin, New Territories, Hong Kong
- HSK GeneTech Limited, Hong Kong Science Park , Shatin, New Territories, Hong Kong
| | - Yiu On Wong
- School of Life Sciences, The Chinese University of Hong Kong , Shatin, New Territories, Hong Kong
- HSK GeneTech Limited, Hong Kong Science Park , Shatin, New Territories, Hong Kong
| | - Ho Yan Lam
- HSK GeneTech Limited, Hong Kong Science Park , Shatin, New Territories, Hong Kong
| | - Yee Yung Ting
- Food Research Centre, The Chinese University of Hong Kong , Shatin, New Territories, Hong Kong
| | - Tsz Kwan Yau
- School of Life Sciences, The Chinese University of Hong Kong , Shatin, New Territories, Hong Kong
| | - Wenyan Nong
- School of Life Sciences, The Chinese University of Hong Kong , Shatin, New Territories, Hong Kong
| | - Dandan Huang
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Tianjin Medical University , Tianjin 300070, China
- Department of Bioinformatics, The Province and Ministry Co-sponsored Collaborative Innovation Centre for Medical Epigenetics, School of Basic Medical Sciences, National Clinical Research Centre for Cancer, Tianjin Medical University Cancer Institute and Hospital, Tianjin Medical University , Tianjin 300070, China
| | - Yichun Xie
- School of Life Sciences, The Chinese University of Hong Kong , Shatin, New Territories, Hong Kong
| | - Peter Chi Keung Cheung
- School of Life Sciences, The Chinese University of Hong Kong , Shatin, New Territories, Hong Kong
- Food Research Centre, The Chinese University of Hong Kong , Shatin, New Territories, Hong Kong
| | - Hoi Shan Kwan
- School of Life Sciences, The Chinese University of Hong Kong , Shatin, New Territories, Hong Kong
- HSK GeneTech Limited, Hong Kong Science Park , Shatin, New Territories, Hong Kong
- Food Research Centre, The Chinese University of Hong Kong , Shatin, New Territories, Hong Kong
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Leung MF, Cheung PCK. Vitamins D and D2 in Cultivated Mushrooms under Ultraviolet Irradiation and Their Bioavailability in Humans: A Mini-Review. Int J Med Mushrooms 2021; 23:1-15. [PMID: 34936304 DOI: 10.1615/intjmedmushrooms.2021040390] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Vitamin D deficiency is a public health issue that not only results in skeletal disorders but is also linked to several chronic diseases. Several studies have shown that ultraviolet (UV)-treated mushrooms are a potential dietary source of vitamin D, as these mushrooms have a high rate of conversion of ergosterol to vitamin D2. However, there are gaps in knowledge about the most appropriate irradiation conditions, including the source, dose, intensity, and duration of irradiation, for maximizing vitamin D2 content in mushrooms. UVB seems to be most effective in transforming ergosterol to vitamin D2 in both fresh and dried mushrooms. Effects of drying, storage, and thermal treatments on vitamin D content in UV-treated fresh mushrooms have been reported. This knowledge is important for the mushroom industry in order to provide the market with vitamin D2-enhanced mushrooms in a safe and affordable manner. Recent studies in humans focused on the bioavailability of vitamin D2 from mushrooms. The study results showed that UV-treated mushrooms were effective in increasing serum 25-hydroxyvitamin D levels, as they contain high vitamin D2. However, other reports indicate that there are no significant changes in serum 25(OH)D levels and suggest that vitamin D2 is not as effective as vitamin D2 in increasing serum 25(OH) D levels. Vitamin D2 bioavailability is still unclear, and there is an urgent need to investigate the effectiveness, safety, and adequate amount of vitamin D2-enhanced mushrooms for reducing vitamin D deficiency and maintaining vitamin D levels.
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Affiliation(s)
- Mei Fong Leung
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - Peter Chi Keung Cheung
- Department of Biology, School of Life Sciences, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
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Huang JJ, Cheung PCK. Cold stress treatment enhances production of metabolites and biodiesel feedstock in Porphyridium cruentum via adjustment of cell membrane fluidity. Sci Total Environ 2021; 780:146612. [PMID: 34030318 DOI: 10.1016/j.scitotenv.2021.146612] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Revised: 03/04/2021] [Accepted: 03/15/2021] [Indexed: 06/12/2023]
Abstract
Porphyridium cruentum, a cell-wall-free marine Rhodophyta microalga was cultured under a 5-day cold stress at 0 °C and 15 °C, after reaching the late logarithmic growth phase. Compared with the control at 25 °C, the cold stress treatment significantly (p < 0.05) increased the microalgal biomass (1.21-fold); the amounts of total polyunsaturated fatty acids (1.22-fold); individual fatty acids including linoleic acid (1.50-fold) and eicosatrienoic acid (1.85-fold), and a major carotenoid zeaxanthin (1.53-fold). Furthermore, production of biodiesel feedstock including total C16 + C18 fatty acids was significantly enhanced (p < 0.05) by 1.18-fold after the cold stress treatment. Principal component analysis further indicated that the biosynthetic pathways of fatty acids and carotenoids in this microalga were correlated with the cold stress treatment. These results suggested that P. cruentum had adjusted its cellular membrane fluidity via an 'arm-raising and screw-bolt fastening' mechanism mediated by the synergistic roles of cis-unsaturated fatty acids and carotenoids. The insight obtained from the responses to cold stress in P. cruentum could be a novel technological approach to enhance the production of microalgal metabolites and biodiesel feedstock.
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Affiliation(s)
- Jim Junhui Huang
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, No. 100, Waihuan West Road, Guangzhou Higher Education Mega Center, Guangzhou 510006, Guangdong Province, People's Republic of China; Food and Nutritional Sciences Programme, School of Life Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong S.A.R., People's Republic of China; Environmental Research Institute, National University of Singapore, 5A Engineering Drive 1, Singapore 117411, Republic of Singapore; Marine Biology Institute, Shantou University, Shantou 515063, Guangdong Province, People's Republic of China
| | - Peter Chi Keung Cheung
- Food and Nutritional Sciences Programme, School of Life Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong S.A.R., People's Republic of China.
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12
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Yap ACS, Li X, Yap YHY, Razif MFM, Jamil AHA, Ng ST, Tan CS, Cheung PCK, Fung SY. Immunomodulatory Properties of Water-Soluble Polysaccharides Extracted from the Fruiting Body of Chinese Caterpillar Mushroom, Ophiocordyceps sinensis Cultivar OCS02® (Ascomycetes). Int J Med Mushrooms 2021; 22:967-977. [PMID: 33426826 DOI: 10.1615/intjmedmushrooms.2020036351] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Ophiocordyceps sinensis (=Cordyceps sinensis) has been known for its various medicinal properties, in particular immunomodulatory activities associated with its polysaccharides. In this study, the fruiting body of O. sinensis cultivar OCS02® was investigated for its chemical composition and monosaccharide profile. Cold water extract (CWE) obtained from this fruiting body was fractionated by molecular weight (MW) into high (HMW), medium (MMW), and low (LMW) fractions. Polysaccharides in the extract and fractions were identified as heteroglycans containing mostly glucose and mannose with small amounts of galactose, fucose, arabinose, and xylose. The immunomodulatory potential of these heteroglycans was evaluated by induction of cytokine/chemokine secretion using murine macrophage RAW 264.7. All treatments showed significant modulation of IL-6, IL-9, MIP-2, and TIMP-1, especially for CWE, HMW, and MMW, which might be due to their high ratios of glucose and the presence of protein. Further investigation on the structure-function relationship of these fruiting body polysaccharide fractions is needed to delineate the underlying mechanism of their immunomodulatory effect both in vitro and in vivo.
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Affiliation(s)
- Alvin Chee Sum Yap
- Medicinal Mushroom Research Group (MMRG), Department of Molecular Medicine, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia
| | - Xiaojie Li
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China; Institute for Advanced Study, Shenzhen University, Shenzhen, P.R. China
| | - Yeannie Hui Yeng Yap
- Department of Oral Biology and Biomedical Sciences, Faculty of Dentistry, MAHSA University, Bandar Saujana Putra, Selangor, Malaysia
| | - Muhammad Fazril Mohamad Razif
- Medicinal Mushroom Research Group (MMRG), Department of Molecular Medicine, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia
| | - Amira Hajirah Abd Jamil
- Department of Pharmaceutical Life Sciences, Faculty of Pharmacy, University of Malaya, Kuala Lumpur, Malaysia
| | - Szu Ting Ng
- LiGNO Research Initiative Department, Ligno Biotech Sdn. Bhd., Balakong Jaya, Selangor, Malaysia
| | - Chon Seng Tan
- LiGNO Research Initiative Department, Ligno Biotech Sdn. Bhd., Balakong Jaya, Selangor, Malaysia
| | - Peter Chi Keung Cheung
- Department of Biology, School of Life Sciences, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - Shin-Yee Fung
- Medicinal Mushroom Research Group (MMRG), Department of Molecular Medicine, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia; Center for Natural Products Research and Drug Discovery (CENAR), University of Malaya, Kuala Lumpur, Malaysia; University of Malaya Centre for Proteomics Research (UMCPR), University of Malaya, Kuala Lumpur, Malaysia
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Sum AYC, Li X, Yeng YYH, Razif MFM, Jamil AHA, Ting NS, Seng TC, Cheung PCK, Fung SY. The Immunomodulating Properties of Tiger Milk Medicinal Mushroom, Lignosus rhinocerus TM02® Cultivar (Agaricomycetes) and Its Associated Carbohydrate Composition. Int J Med Mushrooms 2021; 22:803-814. [PMID: 33389874 DOI: 10.1615/intjmedmushrooms.2020035658] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Natural compounds found in Lignosus rhinocerus like polysaccharides and polysaccharide-protein complexes have the capabilities to modulate the immune system. It possesses antitumor and anti-inflammatory properties and is commonly used in Southeast Asia and Southern China to alleviate illness. To investigate its immunomodulating properties, composition of polysaccharides and the expression of cytokines/chemokines from L. rhinocerus (TM02®) cultivar treated RAW 264.7 were explored. It was revealed, CWE contains linear polysaccharides with 1,4-linkages and rhinoprolycan fraction (HMW & MMW) possesses 1,4-Glcp and 1,6-Glcp backbone and branched chain (1,3,6-Glcp, 1,4,6-Glcp, 1,3,6-Glcp, 1,2,4,6-Glcp). Cytokines profile showed upregulation from CWE (IL-5: 12.078 ± 1.225), HMW (IL-6: 7.297 ± 0.338; TIMP-1: 3.358 ± 0.200), MMW (IL-5: 15.412 ± 5.823; TIMP-1: 1.747 ± 0.053), and LMW (MIP-2: 3.495 ± 0.416; TIMP-1: 7.573 ± 0.088) and possible involvement of NF-κB and MAPK signaling pathway. Further in vivo studies are needed to fully understand the immunomodulatory effects of TM02®.
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Affiliation(s)
- Alvin Yap Chee Sum
- Medicinal Mushroom Research Group (MMRG), Department of Molecular Medicine, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia
| | - Xiaojie Li
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China; Institute for Advanced Study, Shenzhen University, Shenzhen, P.R. China
| | - Yeannie Yap Hui Yeng
- Department of Oral Biology and Biomedical Sciences, Faculty of Dentistry, MAHSA University, Bandar Saujana Putra, Selangor, Malaysia
| | - Muhammad Fazril Mohamad Razif
- Medicinal Mushroom Research Group (MMRG), Department of Molecular Medicine, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia
| | - Amira Hajirah Abd Jamil
- Department of Pharmaceutical Life Sciences, Faculty of Pharmacy, University of Malaya, Kuala Lumpur, Malaysia
| | - Ng Szu Ting
- LiGNO Research Initiative Department, Ligno Biotech Sdn. Bhd., Balakong Jaya, Selangor, Malaysia
| | - Tan Chon Seng
- LiGNO Research Initiative Department, Ligno Biotech Sdn. Bhd., Balakong Jaya, Selangor, Malaysia
| | - Peter Chi Keung Cheung
- Department of Biology, School of Life Sciences, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - Shin-Yee Fung
- Medicinal Mushroom Research Group (MMRG), Department of Molecular Medicine, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia; Center for Natural Products Research and Drug Discovery (CENAR), University of Malaya, Kuala Lumpur, Malaysia; University of Malaya Centre for Proteomics Research (UMCPR), University of Malaya, Kuala Lumpur, Malaysia
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Huang JJ, Huang W, Li J, Li P, Cheung PCK. Potential advancement of ultraviolet-free solar radiation technology in enriching the nutrient composition and biodiesel feedstock production in marine green microalga Platymonas subcordiformis. ACTA ACUST UNITED AC 2020. [DOI: 10.1016/j.biteb.2020.100534] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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15
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Lau AYT, Xie Y, Cheung MK, Cheung PCK, Kwan HS. Genome-wide mRNA and miRNA analysis in the early stages of germ tube outgrowth in Coprinopsis cinerea. Fungal Genet Biol 2020; 142:103416. [PMID: 32522620 DOI: 10.1016/j.fgb.2020.103416] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2019] [Revised: 05/28/2020] [Accepted: 06/01/2020] [Indexed: 01/28/2023]
Abstract
Coprinopsis cinerea is a model mushroom-forming basidiomycete which produces basidiospores during sexual reproduction. This fungus is widely used to study fruiting body formation and development. Molecular mechanisms controlling its growth from vegetative mycelium to multicellular mature fruiting body have been studied extensively. However, little is known about the underlying biological processes during germ tube outgrowth or the transition from basidiospores to multinucleate hyphae. To better understand sexual spore germination in fungi, here we examined the time-dependent cellular events at resting, germinating and fully germinated basidiospores of C. cinerea by genome-wide transcriptional and post-transcriptional analyses and by carbohydrate composition analysis. Our results revealed a high demand of protein degradation, and biosynthesis of various compounds at the early stage of basidiospore gemination and dynamic changes of carbohydrate metabolism throughout the germination process. Seven microRNA-like RNAs (milRNAs) were identified in the resting basidiospores of C. cinerea, six of which were basidiospore-specific. Glycogen and trehalose were shown to be the carbon sources supporting the initiation of germ tube outgrowth. One basidiospore-specific milRNA, cci-milR-37, was found to be a potential regulator of glycogen metabolic pathways related to vegetative hyphal growth. Our results demonstrated the mRNA and miRNA-mediated regulation on energy production, protein and carbohydrate metabolisms at the early developmental stages of germ tube to form totipotent hyphae. To our knowledge, this is the first study to show the roles of miRNAs in mushroom basidiospore germination and out-growth.
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Affiliation(s)
- Amy Yuet Ting Lau
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong
| | - Yichun Xie
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong
| | - Man Kit Cheung
- Department of Surgery, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong
| | - Peter Chi Keung Cheung
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong; CUHK Shenzhen Research Institute, Shenzhen, China
| | - Hoi Shan Kwan
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong; HSK GeneTech Limited, Science Park, Shatin, New Territories, Hong Kong; Probiolife Limited, Science Park, Shatin, New Territories, Hong Kong; Mushroom-X Limited, Cheung Sha Wan Plaza, Lai Chi Kok, Kowloon, Hong Kong.
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17
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Huang JJ, Lin S, Xu W, Cheung PCK. Enhancement of the Production of Bioactive Microalgal Metabolites by Ultraviolet Radiation (UVA 365 nm). J Agric Food Chem 2018; 66:10215-10224. [PMID: 30204439 DOI: 10.1021/acs.jafc.8b03789] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Two marine microalgae, Nitzschia closterium and Isochrysis zhangjiangensis, treated for 9 days with photosynthetically active radiation (PAR), were subjected to 3 days of ultraviolet light band A at 365 nm (UVA365) followed by a 3 day post-UVA PAR treatment. Compared with the control that only had PAR treatment, UVA365 treatment significantly ( p < 0.05) increased the amounts of total xanthophylls in N. closterium and I. zhangjiangensis by up to 3.53- and 1.23-fold, respectively, after 3 days of UVA365 irradiation. In particular, UVA365 treatment markedly ( p < 0.05) increased two major bioactive xanthophyll pigments, fucoxanthin in N. closterium and diadinoxanthin in I. zhangjiangensis, by up to 1.97- and 1.52-fold, respectively. UVA365 treatment significantly ( p < 0.05) increased the accumulation of another bioactive microalgal metabolite, total mycosporine-like amino acids, in N. closterium and I. zhangjiangensis by up to 1.40- and 1.30-fold, respectively. UVA365 irradiation has potential as an efficient approach for enhancing the production of valuable microalgal metabolites.
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Affiliation(s)
- Jim Junhui Huang
- School of Chemical Engineering and Light Industry , Guangdong University of Technology , Number 100, Waihuan West Road , Guangzhou Higher Education Mega Center, Guangzhou 510006 , Guangdong Province , People's Republic of China
- Food and Nutritional Sciences Programme, School of Life Sciences , The Chinese University of Hong Kong , Shatin, New Territories , Hong Kong SAR , People's Republic of China
- Environmental Research Institute , National University of Singapore , 5 Science Drive 2 , Singapore 117597 , Republic of Singapore
| | - Shaoling Lin
- Food and Nutritional Sciences Programme, School of Life Sciences , The Chinese University of Hong Kong , Shatin, New Territories , Hong Kong SAR , People's Republic of China
- College of Food Science , Fujian Agriculture and Forestry University , Number 15, Shangxiadian Road , Fuzhou 350002 , Fujian Province , People's Republic of China
| | - Wenwen Xu
- Food and Nutritional Sciences Programme, School of Life Sciences , The Chinese University of Hong Kong , Shatin, New Territories , Hong Kong SAR , People's Republic of China
- Institute of Biomedicine , Jinan University , 601 West Huangpu Boulevard , Guangzhou 510632 , Guangdong Province , People's Republic of China
| | - Peter Chi Keung Cheung
- Food and Nutritional Sciences Programme, School of Life Sciences , The Chinese University of Hong Kong , Shatin, New Territories , Hong Kong SAR , People's Republic of China
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18
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Lee MK, Li X, Yap ACS, Cheung PCK, Tan CS, Ng ST, Roberts R, Ting KN, Fung SY. Airway Relaxation Effects of Water-Soluble Sclerotial Extract From Lignosus rhinocerotis. Front Pharmacol 2018; 9:461. [PMID: 29867469 PMCID: PMC5949369 DOI: 10.3389/fphar.2018.00461] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2017] [Accepted: 04/19/2018] [Indexed: 12/28/2022] Open
Abstract
Lignosus rhinocerotis has a long history of use by the indigenous community within East Asia to treat a range of health conditions including asthma and chronic cough. To date, there is limited scientific evidence to support its therapeutic effects in relieving these airways conditions. In this study, we examined the effects of the different molecular weight fractions [high-molecular-weight (HMW), medium-molecular-weight (MMW), and low-molecular-weight (LMW)] obtained from the cold water sclerotial extract (CWE) of L. rhinocerotis on airways patency using airway segments isolated from Sprague Dawley rat in an organ bath set-up. It is demonstrated that the HMW and MMW fractions exhibited higher efficacy in relaxing the pre-contracted airways when compared to the CWE and LMW fraction. In addition, the HMW fraction markedly supressed carbachol-, 5-hydroxytrptamine-, and calcium-induced airway contractions. CWE demonstrated a lower efficacy than the HMW fraction but it also significantly attenuated carbachol- and calcium-induced airway contractions. Results showed that the bronchorelaxation effect of CWE and fractions is mediated via blockade of extracellular Ca2+ influx. The composition analysis revealed the following parts of carbohydrate and proteins, respectively: HMW fraction: 71 and 4%; MMW fraction: 35 and 1%; and LMW fraction: 22 and 0.3%. Our results strongly suggest that the polysaccharide–protein complex or proteins found in the HMW and MMW fractions is likely to contribute to the bronchorelaxation effect of CWE.
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Affiliation(s)
- Mei Kee Lee
- Department of Biomedical Science, University of Nottingham Malaysia Campus, Semenyih, Malaysia
| | - Xiaojie Li
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, China
| | - Alvin Chee Sum Yap
- Medicinal Mushroom Research Group, Department of Molecular Medicine, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia
| | | | | | - Szu Ting Ng
- LiGNO Biotech Sdn Bhd, Balakong Jaya, Malaysia
| | - Richard Roberts
- School of Life Sciences, University of Nottingham Medical School, Queen's Medical Centre, Nottingham, United Kingdom
| | - Kang Nee Ting
- Department of Biomedical Science, University of Nottingham Malaysia Campus, Semenyih, Malaysia
| | - Shin Yee Fung
- Medicinal Mushroom Research Group, Department of Molecular Medicine, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia.,Center for Natural Products Research and Drug Discovery, University of Malaya, Kuala Lumpur, Malaysia
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Hu SH, Chen KS, Liu MY, Cheung PCK, Wang JC, Chang SJ. Optimization of Submerged Cultivation Conditions for Production of Big Cup Culinary-Medicinal Mushroom Clitocybe maxima (Agaricomycetes) Biomass with Significant Antioxidative and Antihyperlipidemic Activities. Int J Med Mushrooms 2017; 19:641-651. [PMID: 29199585 DOI: 10.1615/intjmedmushrooms.2017021151] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
In this study, a large Clitocybe maxima mycelium biomass was obtained by submerged cultivation under optimal conditions. Three test samples from lyophilized mycelia, including hot water extract (CW) and elutes from solvents with different polarity (CA and CB), were combined and used to explore antioxidant and antihyper-lipidemic activities in vitro and in vivo. The CA group showed the highest DPPH free radical scavenging activity and iron-reducing capability at concentrations of 6.0% and 3.0% (w/v), respectively. Further, the CA group showed the highest glutathione peroxidase and superoxide dismutase activities at a dose of 0.25 mg/kg body weight (CA-0.25 group) in all hyperlipidemic hamsters tested. Serum lipid levels (apart from high-density lipoprotein cholesterol levels) of hamsters in the CA-0.25 group were lower than those of hamsters in the negative control group in antihy-perlipidemic tests. Therefore, we believe that extracts from C. maxima mycelia are rich reservoirs of antioxidant and antihyperlipidemic activities.
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Affiliation(s)
- Shu-Hui Hu
- Department of Nutrition and Dietetics, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan; Department of Medical Laboratory Science and Biotechnology, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Ker-Shew Chen
- Department of Pharmacy, Tajen University, Pingtung, Taiwan
| | - Ming-Yi Liu
- Department of Dietetics, Tainan Sin-Lau Hospital, Tainan, Taiwan
| | - Peter Chi Keung Cheung
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - Jinn-Chyi Wang
- Department of Food Science and Technology, Tajen University, Pingtung, Taiwan
| | - Sue-Joan Chang
- Department of Life Science, National Cheng Kung University, Tainan, Taiwan, 701
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Lv J, Zhang BB, Liu XD, Zhang C, Chen L, Xu GR, Cheung PCK. Enhanced production of natural yellow pigments from Monascus purpureus by liquid culture: The relationship between fermentation conditions and mycelial morphology. J Biosci Bioeng 2017. [DOI: 10.1016/j.jbiosc.2017.05.010] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Huang JJ, Lin S, Xu W, Cheung PCK. Occurrence and biosynthesis of carotenoids in phytoplankton. Biotechnol Adv 2017; 35:597-618. [DOI: 10.1016/j.biotechadv.2017.05.001] [Citation(s) in RCA: 58] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2016] [Revised: 04/13/2017] [Accepted: 05/11/2017] [Indexed: 01/08/2023]
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Hu SH, Cheung PCK, Hung RP, Chen YK, Wang JC, Chang SJ. Antitumor and Immunomodulating Activities of Exopolysaccharide Produced by Big Cup Culinary- Medicinal Mushroom Clitocybe maxima (Higher Basidiomycetes) in Liquid Submerged Culture. Int J Med Mushrooms 2016; 17:891-901. [PMID: 26756301 DOI: 10.1615/intjmedmushrooms.v17.i9.90] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Water-soluble polysaccharides extracted from mushrooms have been found to have some physiological effects. In this study, exopolysaccharides (EPSs) were extracted by alcohol precipitation from cultivated broth of the mushroom Clitocybe maxima. EPSs with molecular weights of 10(4) and 10(5) Da were obtained by ultrafiltration; they are referred to as EPA and EPB, respectively. The major components of these EPSs were glucose, galactose, mannose, rhamnose, and arabinose. ICR mice with artificially induced metastatic pulmonary tumors were fed a daily diet containing EPA or EPB at doses of 8, 20, or 50 mg/kg. Results showed that the proliferation of pulmonary sarcoma lesions was lower in the groups fed EPS. In addition, the numbers of total T cells, CD4+ cells, CD8+ cells, and macrophages significantly increased in EPS-fed mice compared with the negative control group. The antitumor and immunomodulating effects observed in the EPB-fed groups were higher than those of EPA-fed groups. These results demonstrate the ability of EPSs of C. maxima to inhibit tumor cells while enhancing immune response.
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Affiliation(s)
- Shu-Hui Hu
- Department of Nutrition and Dietetics, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan; Department of Medical Laboratory Science and Biotechnology, Kaohsiung Medical University, Kaohsiung, Taiwan
| | | | - Raw-Pou Hung
- Department of Dietetics, Zhongxiao Branch, Taipei City Hospital, Nangang District, Taipei, Taiwan
| | - Yu-Kuei Chen
- Department of Food Science and Nutrition, MeiHo University, Neipu Shiang, Pingtung, Taiwan
| | - Jinn-Chyi Wang
- Department of Food Science and Technology, Tajen University, Shin-Erh Village, Yen-Pu Shiang, Pingtung, Taiwan
| | - Sue-Joan Chang
- Department of Life Science, National Cheng Kung University, Tainan, Taiwan, 701
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Lin S, Ching LT, Ke X, Cheung PCK. Comparison of the Composition and Antioxidant Activities of Phenolics from the Fruiting Bodies of Cultivated Asian Culinary-Medicinal Mushrooms. Int J Med Mushrooms 2016; 18:871-881. [DOI: 10.1615/intjmedmushrooms.v18.i10.30] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Xu WW, Li B, Lai ETC, Chen L, Huang JJH, Cheung ALM, Cheung PCK. Water extract from Pleurotus pulmonarius with antioxidant activity exerts in vivo chemoprophylaxis and chemosensitization for liver cancer. Nutr Cancer 2014; 66:989-98. [PMID: 25072857 DOI: 10.1080/01635581.2014.936950] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Chemoprophylaxis and chemosensitization are promising strategies to combat human cancers. Natural antioxidant agents show great promise in cancer therapy, and the use of edible mushrooms against cancer is receiving more interest globally. In this study, the radical scavenging activities including diphenyl-1-picrylhydrazyl, superoxide anion radical, hydroxyl radical, and hydrogen peroxide were compared among hot water extracts from 3 edible mushrooms, among which Pleurotus pulmonarius (Pp) possessed the highest antioxidant potential. Oral administration of Pp 2 wk in advance could markedly inhibit the incidence and size of tumor (Huh7 liver cancer cells) with an inhibition rate of 93.1% in nude mice. No obvious side effect was observed in the Pp-treated mice as indicated by their body weight and histological analysis of major organs. The cancer prevention by Pp treatment might be explained by the inhibition of cancer cell proliferation indicated by reduction of ki-67 staining and the inactivation of phosphoinositide 3-kinase (PI3K)/AKT signaling pathway in the Pp-treated mice. Furthermore, a significant synergistic effect was observed when the mice were treated with a combination of low dose of cisplatin and Pp. Taken together, these results suggest the potential application of Pp as an adjuvant in the chemotherapy of liver cancer.
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Affiliation(s)
- Wen Wen Xu
- a School of Life Sciences , The Chinese University of Hong Kong , Shatin, New Territories, Hong Kong , China
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Xu W, Huang JJH, Cheung PCK. Extract of Pleurotus pulmonarius suppresses liver cancer development and progression through inhibition of VEGF-induced PI3K/AKT signaling pathway. PLoS One 2012; 7:e34406. [PMID: 22470568 PMCID: PMC3314644 DOI: 10.1371/journal.pone.0034406] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2011] [Accepted: 03/01/2012] [Indexed: 12/18/2022] Open
Abstract
Liver cancer or hepatocellular carcinoma is one of the leading causes of cancer-related deaths. Conventional chemotherapies are limited by the development of drug resistance and various side effects. Because of its non-toxicity and potent biopharmacological activity, metabolites derived from mushrooms have received more attention in cancer therapy. Our previous studies have demonstrated the anticancer effects of polysaccharide-protein complexes derived from the Pleurotus mushrooms. The aim of this study was to investigate the underlying molecular mechanism of the anticancer activity of a hot water extract containing a polysaccharide-protein complex isolated from Pleurotus pulmonarius (PP) in liver cancer cells. Our results indicated that exposure of liver cancer cells to PP not only significantly reduced the in vitro cancer cell proliferation and invasion but also enhanced the drug-sensitivity to the chemotherapeutic drug Cisplatin. Both oral administration and intraperitoneal injection of PP significantly inhibited the tumor growth in xenograft BALB/c nude mice. PP triggered a marked suppression of the PI3K/AKT signaling pathway in liver cancer cells in vitro and in vivo, and overexpression of the constitutively active form of AKT, Myr-AKT, abrogated this effect and the inhibited proliferation and invasion by PP. Both western blot and ELISA results showed that PP-treated liver cancer cells had reduced expression and secretion of vascular endothelial growth factor (VEGF). Addition of recombinant human VEGF attenuated the inhibitory effects of PP on PI3K/AKT pathway and the cancer phenotypes. Our results demonstrated that PP suppressed the proliferation, invasion, and drug-resistance of liver cancer cells in vitro and in vivo, mediated by the inhibition of autocrine VEGF-induced PI3K/AKT signaling pathway. This study suggests the potential therapeutic implication of PP in the treatment of human liver cancer.
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Affiliation(s)
- Wenwen Xu
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong, China
| | - Jim Jun-hui Huang
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong, China
- Marine Biology Institute, Shatou University, Shatou, Guangdong Province, China
| | - Peter Chi Keung Cheung
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong, China
- * E-mail:
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Chen X, Zhang L, Cheung PCK. Immunopotentiation and anti-tumor activity of carboxymethylated-sulfated beta-(1-->3)-d-glucan from Poria cocos. Int Immunopharmacol 2010; 10:398-405. [PMID: 20093198 DOI: 10.1016/j.intimp.2010.01.002] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2009] [Revised: 11/26/2009] [Accepted: 01/05/2010] [Indexed: 11/25/2022]
Abstract
A carboxymethylated-sulfated derivative of (1-->3)-beta-d-glucan (PCS3-II) extracted from Poria cocos was synthesized and coded as CS-PCS3-II. Results of infrared (IR) and Carbon-13 nuclear magnetic resonance spectroscopy ((13)C NMR) indicated that CS-PCS3-II contained carboxymethyl and sulfate groups with a degree of substitution (DS) of 1.05 and 0.36 respectively. By using size exclusion chromatography (SEC) combined with laser light scatting (LLS), the dependence of radius of gyration (<S(2)>(z)(1/2)) on the molecular weight (M(w)) for CS-PCS3-II was established as <S(2)>(z)(1/2) = 6.92 x 10(-2)M(w)(0.59) in 0.15M NaCl solution at 25 degrees C, suggesting that CS-PCS3-II existed as an extended flexible chain. CS-PCS3-II exhibited significantly higher inhibition ratio to Sarcoma 180 tumor in BALB/c mice than PCS3-II. Histological examination of tumor cells treated with CS-PCS3-II had signs of necrosis and apoptosis. It is postulated that introduction of the carboxymethyl and sulfate groups to PCS3-II increased its possible contact with the receptors of immune cells through hydrogen binding and electrostatic attraction, leading to a stronger immunological responses that resulted in inhibition of tumor cell proliferation. Moreover, there were significant increases in phagocyte and thymus indexes, spleen index, hemolytic activity as well as spleen antibody production and delayed type hypersensitivity (DTH), suggesting that CS-PCS3-II could significantly enhance immunpotentiation in mice.
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Affiliation(s)
- Xiaoyu Chen
- Department of Chemistry, Wuhan University, Wuhan 430072, China
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Lai CKM, Wong KH, Cheung PCK. Antiproliferative Effects of Sclerotial Polysaccharides from Polyporus rhinocerus Cooke (Aphyllophoromycetideae) on Different Kinds of Leukemic Cells. Int J Med Mushrooms 2008. [DOI: 10.1615/intjmedmushr.v10.i3.60] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Wong KH, Cheung PCK. Sclerotium of Culinary-Medicinal King Tuber Oyster Mushroom, Pleurotus tuberregium (Fr.) Singer (Agaricomycetideae): Its Cultivation, Biochemical Composition, and Biopharmacological Effects (Review). Int J Med Mushrooms 2008. [DOI: 10.1615/intjmedmushr.v10.i4.20] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Zhang L, Chen L, Xu X, Zeng F, Cheung PCK. Effect of molecular mass on antitumor activity of heteropolysaccharide from Poria cocos. Biosci Biotechnol Biochem 2005; 69:631-4. [PMID: 15784995 DOI: 10.1271/bbb.69.631] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
A water-soluble heteropolysaccharide ac-PCM0 from Poria cocos was successfully fractionated using a preparative size exclusion chromatography (SEC) column, and their weight-average molecular mass (M(w)) was characterized by analytical SEC combined with laser light scattering (SEC-LLS). The results indicate that the fractions having relatively high M(w) exhibited higher inhibition ratio in vivo antitumor activity than those having M(w) below 3.29 x 10(4). However, the relatively low molecular mass was beneficial to the in vitro antitumor activity. Moreover, ac-PCM0 has a significantly higher enhancement ratio of the body weight than 5-fluorouracil, and its 50% lethal dose is above 1250 mg/kg, indicating a nontoxic nature.
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Affiliation(s)
- Lina Zhang
- Department of Chemistry, Wuhan University, China.
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Abstract
Six water-insoluble (1-->3)-beta-D-glucan fractions TM8-1 to TM8-6 with weight-average molecular mass Mw ranging from 5.76 to 77.4x10(4) obtained from the sclerotia of Pleurotus tuber-regium were sulfated to produce the water-soluble fractions S-TM8-1 to S-TM8-6 with Mw from 6.0 to 64.8x10(4). The degree of substitution (DS) of S-TM8 fractions was analyzed by elemental analysis (EA) to be 1.14-1.74. The 13C NMR results indicated that the C-6 was fully substituted, and C-2, C-4 were partially substituted by the sulfo-groups. The Mw and the intrinsic viscosity [eta] of the S-TM8 fractions were measured, respectively, by size-exclusion chromatography combined with laser light scattering (SEC-LLS), LLS and viscometry in phosphate buffer solution (PBS) at 37 degrees C. The dependences of [eta] and radius of gyration <s2>z(1/2) on Mw for the S-TM8 samples were found to be [eta]=1.89x10(-2) Mw(0.70) (cm3/g) and <s2>z(1/2)=1.12x10(-4) Mw(0.81) (nm) in the Mw range tested. Based on current theories for a wormlike chain model, the molar mass per unit contour length ML and persistence length q of the S-TM8 were calculated to be 990 nm(-1) and 8.5 nm, respectively. The relatively higher q value suggested a more expanded flexible chain of S-TM8 in PBS. The water-solubility and relatively expanded chain conformation of the STM8 fractions were considered to be significant to their antiviral activity.
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Affiliation(s)
- Mei Zhang
- Department of Chemistry, Wuhan University, Wuhan 430072, China
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Jin Y, Zhang L, Chen L, Chen Y, Cheung PCK, Chen L. Effect of culture media on the chemical and physical characteristics of polysaccharides isolated from Poria cocos mycelia. Carbohydr Res 2003; 338:1507-15. [PMID: 12829396 DOI: 10.1016/s0008-6215(03)00197-6] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Mycelia of a wild strain Poria cocos were cultured in two media differing in one constituent: bran extract or corn steep liquor, and are designated as wb and wc, respectively. Six polysaccharide fractions were isolated sequentially from the two mycelia by 0.9% NaCl (PCM1), hot water (PCM2), 0.5 M NaOH (PCM3-I and -II) and 88% formic acid (PCM4-I and -II). Their chemical and physical characteristics were determined by infrared spectroscopy (IR), gas chromatography (GC), 13C NMR, light scattering (LS) and viscometry. The results indicated that wb-, wc-PCM1, and PCM2 were heteropolysaccharides mainly composed of alpha-D-glucose, mannose, and galactose, whereas wb-PCM3-I and wc-PCM3-I were mainly (1-->3)-alpha-D-glucans, and wb- and wc-PCM3-II, PCM4-I and PCM4-II were (1-->3)-beta-D-glucans. Interestingly, (1-->3) alpha- and (1-->3)-beta-D-glucans co-existed in the 0.5 M NaOH fraction and were separated individually into the two fractions (PCM3-I and PCM3-II) after neutralizing with acetic acid. The polysaccharides from wc-PCM cultured in media containing corn steep liquor contained relatively more protein. The polysaccharide fractions also existed in conformations including random coil (as in PCM0 and PCM1) and expanded chain (as in PCM3), and differed molecular mass. In addition, two exo-polysaccharides isolated from the two culture media by methanol precipitation (wb- and wc-PCM0) also differed in their monosaccharide composition.
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Affiliation(s)
- Yong Jin
- Department of Chemistry, Wuhan University, Wuhan 430072, PR China
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Jin Y, Zhang L, Zhang M, Chen L, Cheung PCK, Oi VEC, Lin Y. Antitumor activities of heteropolysaccharides of Poria cocos mycelia from different strains and culture media. Carbohydr Res 2003; 338:1517-21. [PMID: 12829397 DOI: 10.1016/s0008-6215(03)00198-8] [Citation(s) in RCA: 77] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Ten water-soluble heteropolysaccharide fractions were isolated from Poria cocos mycelia cultured from one wild and one cultivated strain in two identical culture media differing only in one component: either corn steep liquor or bran extract. The chemical compositions, including monosaccharide profile, protein content, and molecular mass M(w) of the mycelial polysaccharides were determined. Both the in vitro and in vivo antitumor activities of the heteropolysaccharides were evaluated and compared. The heteropolysaccharides from Poria cocos mycelia cultured with the wild strain in a medium containing corn steep liquor exhibited the highest antitumor activities against Sarcoma 180 in vivo.
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Affiliation(s)
- Yong Jin
- Department of Chemistry, Wuhan University, Wuhan 430072, PR China
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Zhang M, Zhang L, Cheung PCK. Molecular mass and chain conformation of carboxymethylated derivatives of beta-glucan from sclerotia of Pleurotus tuber-regium. Biopolymers 2003; 68:150-9. [PMID: 12548620 DOI: 10.1002/bip.10277] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Seven water-insoluble (1 --> 3)-beta-D-glucan fractions TM8-1 to TM8-7 with weight-average molecular mass M(w) ranged from 2.22 to 77.4 x 10(4) obtained from the sclerotia of Pleurotus tuber-regium were carboxymethylated to produce the water-soluble fractions CTM8-1 to CTM8-7 with M(w) ranged from 3.87 to 87.8 x 10(4). The degree of substitution (DS) of CTM8 fractions was analyzed by ir and elemental analysis (EA) to be 0.3-0.68. The M(w) and the intrinsic viscosity [eta] of the CTM8 fractions were measured by size-exclusion chromatography combined with multiangle laser light scattering (SEC-MALLS), MALLS, and viscometry in phosphate buffer solution (PBS) at 37 degrees C. The dependencies of [eta] and radius of gyration <s(2)>(z) (1/2) on M(w) for the CTM8 samples were found to be [eta] = (8.82 +/- 0.03) x 10(-3) M(w)(0.78 +/- 0.04) (cm(3) g(-1)) and <s(2)>(z) (1/2) = (3.09 +/- 0.05) x 10(-3) M(w)(0.75 +/- 0.06) (nm) in the M(w) range from 3.87 x 10(4) to 53.2 x 10(4). Based on current theories for wormlike chain model, the conformational parameters of the CTM8 were obtained to be 790 (nm(-1)) for M(L), 9.6 (nm) for q, which were higher than those of the native TM8 fractions, suggesting a more extended flexible chain of CTM8 in PBS. On the whole, the CTM8 fractions showed higher antitumor activity than their corresponding TM8 fractions. In view of data from molecular parameters and bioactivity, the antitumor activity of the CTM8 fractions may be correlated to its water solubility and relatively extended chain.
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Affiliation(s)
- Mei Zhang
- Department of Chemistry, Wuhan University, Wuhan 430072, China
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Lim SN, Cheung PCK, Ooi VEC, Ang PO. Evaluation of antioxidative activity of extracts from a brown seaweed, Sargassum siliquastrum. J Agric Food Chem 2002; 50:3862-6. [PMID: 12059172 DOI: 10.1021/jf020096b] [Citation(s) in RCA: 107] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Antioxidative activities of the extracts from Sargassum siliquastrum were determined using the inhibition of red blood cell (RBC) hemolysis induced by 2,2'-azobis(2-amidinopropane) dihydrochloride (AAPH) radicals, suppression of lipid peroxidation using rat brain homogenate, and scavenging activity of superoxide radicals. The dichloromethane fraction isolated from the methanol crude extract by differential solvent extractions exhibited the strongest antioxidant activity in both RBC hemolysis and lipid peroxidation assays. This fraction was further fractionated into four subfractions F1-F4 by silica gel column chromatography. F1 was found to be most effective in protecting RBC against AAPH radicals and in inhibiting lipid peroxidation. On the basis of thin-layer chromatography and UV and IR spectra analyses, all subfractions contained phenolic compounds. However, there was no correlation between the above antioxidant potency and total phenolic compounds estimated by using the Folin-Ciocalteau method.
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Affiliation(s)
- S N Lim
- Department of Biology, The Chinese University of Hong Kong, Shatin, New Territories, People's Republic of China
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