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Zheng Q, Zheng Y, Jia RB, Luo D, Chen C, Zhao M. Fucus vesiculosus polysaccharide alleviates type 2 diabetes in rats via remodeling gut microbiota and regulating glycolipid metabolism-related gene expression. Int J Biol Macromol 2023; 248:126504. [PMID: 37625739 DOI: 10.1016/j.ijbiomac.2023.126504] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Revised: 08/13/2023] [Accepted: 08/22/2023] [Indexed: 08/27/2023]
Abstract
The antidiabetic activity and underlying mechanisms of Fucus vesiculosus polysaccharide (FVP) were studied in type 2 diabetic rats. Our results exhibited that FVP intervention reversed body weight loss, alleviated hyperglycemia and insulin resistance in diabetic rats. FVP also had the potential to ameliorate dyslipidemia, liver and kidney dysfunction, decrease oxidative stress, promote glycogen synthesis, and boost short-chain fatty acid production and total bile acid excretion. 16S rRNA gene sequencing analysis suggested that FVP interfered with the gut microbiota in a beneficial manner. Moreover, RT-qPCR results demonstrated that the antidiabetic activity of FVP in connection with the acceleration of blood glucose absorption and glycogen synthesis, the inhibition of gluconeogenesis, and the regulation of lipid metabolism in the liver. These findings suggested that FVP had antidiabetic effects on high-fat diet and STZ-induced diabetic rats and could be a potential resource for treating type 2 diabetes mellitus.
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Affiliation(s)
- Qianwen Zheng
- College of Food Science and Technology, Guangdong Ocean University, Zhanjiang 524088, China; School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, China; Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory, Chaozhou 521000, China
| | - Yang Zheng
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, China; Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory, Chaozhou 521000, China
| | - Rui-Bo Jia
- College of Food Science and Technology, Guangdong Ocean University, Zhanjiang 524088, China; School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, China; Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory, Chaozhou 521000, China.
| | - Donghui Luo
- College of Food Science and Technology, Guangdong Ocean University, Zhanjiang 524088, China; Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory, Chaozhou 521000, China
| | - Chong Chen
- College of Food Science and Technology, Guangdong Ocean University, Zhanjiang 524088, China
| | - Mouming Zhao
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, China; Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory, Chaozhou 521000, China.
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Liu T, Ren Q, Wang S, Gao J, Shen C, Zhang S, Wang Y, Guan F. Chemical Modification of Polysaccharides: A Review of Synthetic Approaches, Biological Activity and the Structure-Activity Relationship. Molecules 2023; 28:6073. [PMID: 37630326 PMCID: PMC10457902 DOI: 10.3390/molecules28166073] [Citation(s) in RCA: 13] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Revised: 08/11/2023] [Accepted: 08/13/2023] [Indexed: 08/27/2023] Open
Abstract
Natural polysaccharides are macromolecular substances with great potential owing to their wide biological activity and low toxicity. However, not all polysaccharides have significant pharmacodynamic activity; hence, appropriate chemical modification methods can be selected according to the unique structural characteristics of polysaccharides to assist in enhancing and promoting the presentation of their biological activities. This review summarizes research progress on modified polysaccharides, including common chemical modification methods, the change in biological activity following modification, and the factors affecting the biological activity of chemically modified polysaccharides. At the same time, the difficulties and challenges associated with the structural modification of natural polysaccharides are also outlined in this review. Thus, research on polysaccharide structure modification is critical for improving the development and utilization of sugar products.
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Affiliation(s)
- Tianbo Liu
- School of Pharmacy, Heilongjiang University of Chinese Medicine, 24 Heping Road, Xiangfang District, Harbin 150040, China; (T.L.); (Q.R.); (S.W.); (J.G.); (C.S.); (S.Z.)
| | - Qianqian Ren
- School of Pharmacy, Heilongjiang University of Chinese Medicine, 24 Heping Road, Xiangfang District, Harbin 150040, China; (T.L.); (Q.R.); (S.W.); (J.G.); (C.S.); (S.Z.)
| | - Shuang Wang
- School of Pharmacy, Heilongjiang University of Chinese Medicine, 24 Heping Road, Xiangfang District, Harbin 150040, China; (T.L.); (Q.R.); (S.W.); (J.G.); (C.S.); (S.Z.)
| | - Jianing Gao
- School of Pharmacy, Heilongjiang University of Chinese Medicine, 24 Heping Road, Xiangfang District, Harbin 150040, China; (T.L.); (Q.R.); (S.W.); (J.G.); (C.S.); (S.Z.)
| | - Congcong Shen
- School of Pharmacy, Heilongjiang University of Chinese Medicine, 24 Heping Road, Xiangfang District, Harbin 150040, China; (T.L.); (Q.R.); (S.W.); (J.G.); (C.S.); (S.Z.)
| | - Shengyu Zhang
- School of Pharmacy, Heilongjiang University of Chinese Medicine, 24 Heping Road, Xiangfang District, Harbin 150040, China; (T.L.); (Q.R.); (S.W.); (J.G.); (C.S.); (S.Z.)
| | - Yanhong Wang
- School of Pharmacy, Heilongjiang University of Chinese Medicine, 24 Heping Road, Xiangfang District, Harbin 150040, China; (T.L.); (Q.R.); (S.W.); (J.G.); (C.S.); (S.Z.)
- Key Laboratory of Basic and Application Research of Beiyao, Ministry of Education, Heilongjiang University of Chinese Medicine, 24 Heping Road, Xiangfang District, Harbin 150040, China
| | - Feng Guan
- School of Pharmacy, Heilongjiang University of Chinese Medicine, 24 Heping Road, Xiangfang District, Harbin 150040, China; (T.L.); (Q.R.); (S.W.); (J.G.); (C.S.); (S.Z.)
- Key Laboratory of Basic and Application Research of Beiyao, Ministry of Education, Heilongjiang University of Chinese Medicine, 24 Heping Road, Xiangfang District, Harbin 150040, China
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Structure-function relationships of pectic polysaccharides from broccoli by-products with in vitro B lymphocyte stimulatory activity. Carbohydr Polym 2023; 303:120432. [PMID: 36657866 DOI: 10.1016/j.carbpol.2022.120432] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2022] [Revised: 11/18/2022] [Accepted: 12/01/2022] [Indexed: 12/12/2022]
Abstract
To study structure-function relationships of pectic polysaccharides with their immunostimulatory activity, broccoli by-products were used. Pectic polysaccharides composed by 64 mol% uronic acids, 18 mol% Ara, and 10 mol% Gal, obtained by hot water extraction, activated B lymphocytes in vitro (25-250 μg/mL). To disclose active structural features, combinations of ethanol and chromatographic fractionation and modification of the polysaccharides were performed. Polysaccharides insoluble in 80 % ethanol (Et80) showed higher immunostimulatory activity than the pristine mixture, which was independent of molecular weight range (12-400 kDa) and removal of terminal or short Ara side chains. Chemical sulfation did not promote B lymphocyte activation. However, the action of pectin methylesterase and endo-polygalacturonase on hot water extracted polysaccharides produced an acidic fraction with a high immunostimulatory activity. The de-esterified homogalacturonan region seem to be an important core to confer pectic polysaccharides immunostimulatory activity. Therefore, agri-food by-products are a source of pectic polysaccharide functional food ingredients.
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Guo Z, Wang L, Haq SU, Wang L, Guo W, Luo Y, Ijaz N. In-vitro evaluation of immunomodulatory activity of sulphation-modified total ginsenosides derivative-3. Front Vet Sci 2023; 10:1068315. [PMID: 36761888 PMCID: PMC9907730 DOI: 10.3389/fvets.2023.1068315] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2022] [Accepted: 01/02/2023] [Indexed: 01/26/2023] Open
Abstract
Background Ginseng has been used in biomedicine to prevent and treat decreased physical and mental capacities. Total ginsenosides (TG) from ginseng root which have antitumor and immune-enhancing properties, are the principal active components of Panax ginseng, while the sulphation-modified TG derivative-3 (SMTG-d3) was expected to enhance the anticancer activity in conventional medicinal treatments. Methods The chlorosulphonic acid-pyridine technique, used for the sulfation modification of TG to improve their biological activity, and the infrared spectroscopic characteristics of TG and SMTG-d3 were investigated, and the effects of SMTG-d3 on immunocytes and cytokines relevant to tumor treatment were assessed. The MTT assay was used to assess the effect of TG and SMTG-d3 on the cytotoxicity and T-lymphocytic proliferation against mouse splenocytes. The LDH method was employed to evaluate NK activity induced by TG or SMTG-d3. The production levels of splenocytes-secreted IL-2 and IFN-γ and peritoneal macrophages-secreted TNF-α were determined using mouse ELISA kits. Results and discussion It showed that the ideal conditions for the sulfation modification of TG: the volume ratio of chlorosulfonic acid to pyridine lower than 1:2.5; controlled amount of chlorosulfonic acid; and a yield of 51.5% SMTG-d3 (2 h, < 45°C). SMTG-d3 showed two characteristic absorption peaks at 1,230 cm-1 and 810 cm-1, indicating the formation of sulfuric acid esters and the presence of sulfuric acid groups. SMTG-d3 exhibited higher antitumor immunological activity than TG by promoting the proliferation of T lymphocytes and the production of IFN-γ and TNF-α, thus enhancing NK cell activity, and reducing cytotoxicity. The findings imply sulfated modification represents an effective method of enhancing the immunomodulatory activities of TG and could be used as the basis for developing new drug target compounds; SMTG-d3 can serve as an antitumor immunomodulator and can be considered an effective and prospective herbal formulation in clinical applications.
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Affiliation(s)
- Zhiting Guo
- Key Laboratory of New Animal Drug Project, Lanzhou, Gansu, China,Key Laboratory of Veterinary Pharmaceutical Development, Ministry of Agriculture and Rural Affairs, Lanzhou Institute of Husbandry and Pharmaceutical Sciences, Chinese Academy of Agriculture Sciences, Lanzhou, Gansu, China
| | - Ling Wang
- Key Laboratory of New Animal Drug Project, Lanzhou, Gansu, China,Key Laboratory of Veterinary Pharmaceutical Development, Ministry of Agriculture and Rural Affairs, Lanzhou Institute of Husbandry and Pharmaceutical Sciences, Chinese Academy of Agriculture Sciences, Lanzhou, Gansu, China,*Correspondence: Ling Wang ✉
| | - Shahbaz Ul Haq
- Key Laboratory of New Animal Drug Project, Lanzhou, Gansu, China,Key Laboratory of Veterinary Pharmaceutical Development, Ministry of Agriculture and Rural Affairs, Lanzhou Institute of Husbandry and Pharmaceutical Sciences, Chinese Academy of Agriculture Sciences, Lanzhou, Gansu, China
| | - Lu Wang
- Engineering Research Center of Ministry of Education for the Development and Utilization of Southwest Characteristic Medicine Biological Resources, School of Pharmacy, Guizhou University, Guiyang, China
| | - Wenzhu Guo
- Key Laboratory of New Animal Drug Project, Lanzhou, Gansu, China,Key Laboratory of Veterinary Pharmaceutical Development, Ministry of Agriculture and Rural Affairs, Lanzhou Institute of Husbandry and Pharmaceutical Sciences, Chinese Academy of Agriculture Sciences, Lanzhou, Gansu, China
| | - Yongjiang Luo
- Key Laboratory of New Animal Drug Project, Lanzhou, Gansu, China,Key Laboratory of Veterinary Pharmaceutical Development, Ministry of Agriculture and Rural Affairs, Lanzhou Institute of Husbandry and Pharmaceutical Sciences, Chinese Academy of Agriculture Sciences, Lanzhou, Gansu, China
| | - Nabeel Ijaz
- Department of Clinical Sciences, Faculty of Veterinary Sciences, Bahauddin Zakariya University, Multan, Pakistan
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Zhuansun W, Xu J, Liu H, Zhao Y, Chen L, Shan S, Song S, Zhang H, Dong T, Zeng H, Xu Q. Optimisation of the production of a selenium-enriched polysaccharide from Cordyceps cicadae S1 and its structure and antioxidant activity. Front Nutr 2022; 9:1032289. [PMID: 36337663 PMCID: PMC9631440 DOI: 10.3389/fnut.2022.1032289] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Accepted: 09/28/2022] [Indexed: 07/30/2023] Open
Abstract
The fermentation medium of a newly identified Cordyceps cicadae S1 was optimized by response surface methodology, with the optimal medium containing sucrose (80 g/L), yeast powder (60 g/L), KH2PO4 (5 g/L), MgSO4·7H2O (1 g/L) and Na2SeO3 (0. 1 g/L). Under these conditions, the extracellular polysaccharide yield was 8.09 g/L. A novel selenium-enriched polysaccharide (PACI-1) was isolated from Cordyceps cicadae, purified and identified as a homofructose polysaccharide with a low average molecular weight of 9.95 × 103 Da. The fine structure of PACI-1 was analyzed using NMR, CD, and AFM. Additionally, the in vitro antioxidant results showed that the PACI-1 had stronger antioxidant capacity than natural polysaccharides. These results provided a candidate strain for producing selenium polysaccharide and a new polysaccharide from C. cicadae, which showed good antioxidant activity.
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Affiliation(s)
- Wanwan Zhuansun
- Anhui Province Key Laboratory of Pollutant Sensitive Materials and Environmental Remediation, School of Life Sciences Huaibei Normal University, Huaibei, China
| | - Jun Xu
- R&D Center of Anhui Kouzi Distillery Co., Ltd, Huaibei, China
| | - Hengzhao Liu
- R&D Center of Anhui Kouzi Distillery Co., Ltd, Huaibei, China
| | - Ying Zhao
- R&D Center of Anhui Kouzi Distillery Co., Ltd, Huaibei, China
| | - Lulu Chen
- R&D Center of Anhui Kouzi Distillery Co., Ltd, Huaibei, China
| | - Shufang Shan
- R&D Center of Anhui Kouzi Distillery Co., Ltd, Huaibei, China
| | - Shiqin Song
- Key Laboratory of Se-enriched Products Development and Quality Control, Ministry of Agriculture and Rural Affairs, Ankang, China
- National-Local Joint Engineering Laboratory of Se-enriched Food Development, Ankang R&D Center for Se-enriched Products, Ankang, China
| | - Haoyu Zhang
- Anhui Province Key Laboratory of Pollutant Sensitive Materials and Environmental Remediation, School of Life Sciences Huaibei Normal University, Huaibei, China
| | - Tingting Dong
- Anhui Province Key Laboratory of Pollutant Sensitive Materials and Environmental Remediation, School of Life Sciences Huaibei Normal University, Huaibei, China
| | - Huawei Zeng
- Anhui Province Key Laboratory of Pollutant Sensitive Materials and Environmental Remediation, School of Life Sciences Huaibei Normal University, Huaibei, China
| | - Qinxiang Xu
- R&D Center of Anhui Kouzi Distillery Co., Ltd, Huaibei, China
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Correlating rheology with 3D printing performance based on thermo-responsive κ-carrageenan/Pleurotus ostreatus protein with regard to interaction mechanism. Food Hydrocoll 2022. [DOI: 10.1016/j.foodhyd.2022.107813] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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7
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Phytochemicals of six selected herbal plants and their inhibitory activities towards free radicals and glycation. FOOD BIOSCI 2022. [DOI: 10.1016/j.fbio.2022.101557] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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8
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Zheng Q, Jia RB, Ou ZR, Li ZR, Zhao M, Luo D, Lin L. Comparative study on the structural characterization and α-glucosidase inhibitory activity of polysaccharide fractions extracted from Sargassum fusiforme at different pH conditions. Int J Biol Macromol 2022; 194:602-610. [PMID: 34808147 DOI: 10.1016/j.ijbiomac.2021.11.103] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2021] [Revised: 11/05/2021] [Accepted: 11/15/2021] [Indexed: 11/05/2022]
Abstract
Sargassum fusiforme polysaccharides (SFPs), including SFP-3-40, SFP-3-60, SFP-3-80, SFP-7-40, SFP-7-60, SFP-7-80, SFP-10-40, SFP-10-60, and SFP-10-80, were extracted at different pH (3, 7, and 10), and then precipitated with graded precipitation of 40%, 60% and 80% (v/v) ethanol solution, respectively. Their physicochemical properties and α-glucosidase inhibitory activity were determined. Results showed that SFPs significantly differed in the contents of total sugar, protein, uronic acid, sulfate, the zeta potential, and molecular weight distribution. SFPs, including SFP-10-40, SFP-10-60, and SFP-10-80, had bigger absolute zeta potential value and higher respective average molecular weight in the same ethanol concentration precipitate. All samples were mainly composed of fucose, glucuronic acid, and mannose with different molar ratios. The extraction pH and precipitation ethanol solution concentration caused little changes in functional groups, but significantly altered surface morphology of SFPs. Congo red test revealed that all polysaccharides were not helical polysaccharides. Rheological measurements indicated that SFPs were pseudoplastic fluids and showed elastic behavior of the gel. Except SFP-3-40 and SFP-3-60, all other samples had a stronger α-glucosidase inhibitory activity than that of acarbose. The inhibition type of SFPs against α-glucosidase varied owing to different extraction pH and precipitation ethyl concentration. This study shows that extraction pH can significantly affect the structure and hypoglycemic activity of SFPs and provide a data support for the scientific use of Sargassum fusiforme in industrial production.
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Affiliation(s)
- Qianwen Zheng
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, China; Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory, Chaozhou 521000, China
| | - Rui-Bo Jia
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, China; Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory, Chaozhou 521000, China.
| | - Zhi-Rong Ou
- Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory, Chaozhou 521000, China
| | - Zhao-Rong Li
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, China; Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory, Chaozhou 521000, China
| | - Mouming Zhao
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, China; Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory, Chaozhou 521000, China
| | - Donghui Luo
- Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory, Chaozhou 521000, China; College of Food Science and Technology, Guangdong Ocean University, Zhanjiang 524088, China
| | - Lianzhu Lin
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, China; Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory, Chaozhou 521000, China.
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Sulfated modification enhances the immunomodulatory effect of Cyclocarya paliurus polysaccharide on cyclophosphamide-induced immunosuppressed mice through MyD88-dependent MAPK/NF-κB and PI3K-Akt signaling pathways. Food Res Int 2021; 150:110756. [PMID: 34865774 DOI: 10.1016/j.foodres.2021.110756] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2021] [Revised: 09/10/2021] [Accepted: 10/09/2021] [Indexed: 01/16/2023]
Abstract
The present study investigated the effect of sulfation on the immunomodulatory effect of Cyclocarya paliurus polysaccharide (CP) through a Cyclophosphamide (CTX)-induced immunosuppression mice model. The results showed that sulfated Cyclocarya paliurus polysaccharide (SCP3) had stronger immunomodulatory ability than CP. Administration of SCP3 alleviated immune organ atrophy and restored hematopoiesis in immunosuppressed mice, enhanced splenocyte proliferation, and promoted cytokines and nitric oxide (NO) production in splenocyte supernatants, as well as the number of CD3+, CD4+ and CD8+ T lymphocytes. Meantime, SCP3 significantly improved oxidative stress via increasing the activities of antioxidant enzymes and decreasing the levels of malondialdehyde (MDA) in liver. In addition, SCP3 significantly upregulated the phosphorylation expression of JNK, Erk 1/2, p38 of MAPKs signaling pathway at a dose of 50 mg/kg and accordingly showed increased phosphorylation of Akt, NF-κB (p65), IκB-α, and promoted the degradation of IkB-α. Furthermore, SCP3 significantly increased the expression of the upstream signaling molecule MyD88. All results demonstrated that sulfation can be an effective way to enhance the immunomodulatory effect of polysaccharides. SCP3 has high potential to be a functional food supplement candidate for alleviating chemotherapy drug-induced immunosuppression.
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Efficacy and Safety of Qiwei Tongbi Oral Liquid in Patients with Stable Long-Standing Rheumatoid Arthritis. BIOMED RESEARCH INTERNATIONAL 2021; 2021:3930800. [PMID: 34725638 PMCID: PMC8557082 DOI: 10.1155/2021/3930800] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Accepted: 09/28/2021] [Indexed: 11/17/2022]
Abstract
Objective Our study is aimed at investigating the efficacy and safety of Qiwei Tongbi oral liquid in patients with stable long-standing rheumatoid arthritis (RA). Method 140 patients with stable long-standing RA were recruited into the Qiwei Tongbi oral liquid group or the control group. At study recruitment and after 12 weeks of treatment, their C-reactive protein (CRP) levels, interleukin-6 (IL-6) levels, erythrocyte sedimentation rate (ESR), Health Assessment Questionnaire (HAQ), visual analogue scale (VAS), and Disease Activity Score (DAS) 28 were compared in two groups. Results Patients in the Qiwei Tongbi oral liquid group had a lower level of CRP, IL-6, VAS scale, and HAQ score compared to patients in the control group (CRP: 3.51 ± 1.57 vs.5.47 ± 1.72 mg/L, P < 0.001; IL-6: 1.62 ± 0.8 vs. 2.19 ± 0.88 pg/mL, P < 0.001; VAS scale: 1.59 ± 0.69 vs. 2.66 ± 1.02, P < 0.001; and HAQ score: 1.19 ± 0.46 vs. 1.41 ± 0.50, P = 0.005). The ESR and DAS28 did not reach statistical difference. No damage to liver and kidney functions was observed in both groups. Conclusion Qiwei Tongbi oral liquid has the tendency to decrease the inflammation levels and pain score and improve patients' outcomes in patients with stable long-standing RA.
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Luo M, Zhang X, Wu J, Zhao J. Modifications of polysaccharide-based biomaterials under structure-property relationship for biomedical applications. Carbohydr Polym 2021; 266:118097. [PMID: 34044964 DOI: 10.1016/j.carbpol.2021.118097] [Citation(s) in RCA: 59] [Impact Index Per Article: 19.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Revised: 04/13/2021] [Accepted: 04/17/2021] [Indexed: 12/20/2022]
Abstract
Polysaccharides are well accepted biomaterials that have attracted considerable attention. Compared with other materials under research, polysaccharides show unique advantages: they are available in nature and are normally easily acquired, those acquired from nature show favorable immunogenicity, and are biodegradable and bioavailable. The bioactivity and possible applications are based on their chemical structure; however, naturally acquired polysaccharides sometimes have unwanted flaws that limit further applications. For this reason, carefully summarizing the possible modifications of polysaccharides to improve them is crucial. Structural modifications can not only provide polysaccharides with additional functional groups but also change their physicochemical properties. This review based on the structure-property relation summarizes the common chemical modifications of polysaccharides, the related bioactivity changes, possible functionalization methods, and major possible biomedical applications based on modified polysaccharides.
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Affiliation(s)
- Moucheng Luo
- School of Biomedical Engineering, Sun Yat-sen University, Shenzhen 518107, China
| | - Xinyu Zhang
- Department of Hematology, The Seventh Affiliated Hospital, Sun Yat-sen University, Shenzhen 518107, China
| | - Jun Wu
- School of Biomedical Engineering, Sun Yat-sen University, Shenzhen 518107, China.
| | - Jinmin Zhao
- Guangxi Engineering Center in Biomedical Materials for Tissue and Organ Regeneration, The First Affiliated Hospital of Guangxi Medical University, Nanning 530021, China.
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Gunasekaran S, Govindan S, Ramani P. Sulfated modification, characterization and bioactivities of an acidic polysaccharide fraction from an edible mushroom Pleurotus eous (Berk.) Sacc. Heliyon 2021; 7:e05964. [PMID: 33511294 PMCID: PMC7815800 DOI: 10.1016/j.heliyon.2021.e05964] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2020] [Revised: 11/09/2020] [Accepted: 01/08/2021] [Indexed: 12/13/2022] Open
Abstract
The acidic fraction (P3a) of Pleurotus eous was successfully sulfated by sulphur trioxide-pyridine complex method. The effect of sulfate modification (SP3a) on the structure, physicochemical properties and in vitro biological activity of P3 was studied. The structural characteristics were established by UV absorption, FT-IR, HPGPC and GC-MS. Biological studies were carried out, such as in vitro antioxidant, anticoagulant, anti-tumour and antibacterial activities. The sulfation process changed its physicochemical and biological characteristics. Compared with P3a, the molecular weight of SP3a is reduced. P3a and SP3a are composed of galactose, xylose, arabinose with different molar percentages. Sulfated derivatives have strong antioxidant and anticoagulant properties. Compared with P3a, SP3a showed obvious cytotoxicity to Jurkat and HeLa cells. SP3a showed a higher inhibition zone for Gram-positive and Gram-negative bacteria. This article demonstrates that sulfation is an effective way to enhance biological activity, especially SP3a is a promising candidate for bioactive macromolecules and has great potential for industrial and biomedical applications.
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Affiliation(s)
- Sasikala Gunasekaran
- Department of Biochemistry, School of Biosciences, Periyar University, Salem, India
| | - Sudha Govindan
- Department of Biochemistry, School of Biosciences, Periyar University, Salem, India
| | - Prasanna Ramani
- Dhanvanthri Lab, Department of Sciences, Amrita School of Engineering, Amrita Vishwa Vidyapeetham, Coimbatore, India
- Center of Excellence in Advanced Materials & Green Technologies (CoE–AMGT), Amrita School of Engineering, Amrita Vishwa Vidyapeetham, Coimbatore, India
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Gu J, Zhang H, Wen C, Zhang J, He Y, Ma H, Duan Y. Purification, characterization, antioxidant and immunological activity of polysaccharide from Sagittaria sagittifolia L. Food Res Int 2020; 136:109345. [DOI: 10.1016/j.foodres.2020.109345] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Revised: 05/20/2020] [Accepted: 05/20/2020] [Indexed: 12/22/2022]
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Liu J, Wu SY, Chen L, Li QJ, Shen YZ, Jin L, Zhang X, Chen PC, Wu MJ, Choi JI, Tong HB. Different extraction methods bring about distinct physicochemical properties and antioxidant activities of Sargassum fusiforme fucoidans. Int J Biol Macromol 2020; 155:1385-1392. [PMID: 31733246 DOI: 10.1016/j.ijbiomac.2019.11.113] [Citation(s) in RCA: 56] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2019] [Revised: 11/09/2019] [Accepted: 11/12/2019] [Indexed: 01/11/2023]
Abstract
Fucoidan is a complex sulfated polysaccharide and an active component found in the cell wall of brown seaweeds. In the present study, fucoidans were obtained from Sargassum fusiforme using different extraction methods, including hot water (prepared fucoidan was named as WSFF), dilute hydrochloric acid (ASFF), and calcium chloride solution (CSFF). The assessments were performed on S. fusiforme fucoidans based on their chemical composition, molecular conformations, and in vitro antioxidant activities. ASFF showed the maximum extraction yield (11.24%), whereas CSFF exhibited the minimum yield (3.94%). The monosaccharide composition of WSFF, ASFF, and CSFF was similar, but the molar ratio of monosaccharide was quite different. Moreover, their molecular weight, Fourier transform infrared (FT-IR) spectrum, surface morphology, uronic acid content and degree of sulfation were distinct. The Congo red test and Circular dichroism spectroscopy analysis displayed some differences in solution conformation of these samples. Furthermore, WSFF, ASFF, and CSFF showed distinct in vitro antioxidant activities evaluated by DPPH and hydroxyl radical scavenging assays. The present study provides scientific evidence on the influences of extraction methods on the physicochemical characteristics, conformation behaviors and antioxidant activities of S. fusiforme fucoidans.
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Affiliation(s)
- Jian Liu
- College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China; Department of Biotechnology and Bioengineering, Chonnam National University, Gwangju 500-757, South Korea
| | - Si-Ya Wu
- College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China
| | - Ling Chen
- College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China
| | - Qiao-Juan Li
- College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China
| | - Yi-Zhe Shen
- College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China
| | - Li Jin
- College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China
| | - Xu Zhang
- College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China
| | - Pei-Chao Chen
- College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China
| | - Ming-Jiang Wu
- College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China.
| | - Jong-Il Choi
- Department of Biotechnology and Bioengineering, Chonnam National University, Gwangju 500-757, South Korea.
| | - Hai-Bin Tong
- College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China.
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15
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Sulfated modification, characterization, and potential bioactivities of polysaccharide from the fruiting bodies of Russula virescens. Int J Biol Macromol 2020; 154:1438-1447. [DOI: 10.1016/j.ijbiomac.2019.11.025] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2019] [Revised: 10/24/2019] [Accepted: 11/05/2019] [Indexed: 02/06/2023]
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16
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Zheng L, Ma Y, Zhang Y, Meng Q, Yang J, Gong W, Liu Q, Cai L, Hao L, Wang B, Yang Y. Distribution of Zinc in Mycelial Cells and Antioxidant and Anti-Inflammatory Activities of Mycelia Zinc Polysaccharides from Thelephora ganbajun TG-01. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2020; 2020:2308017. [PMID: 32655762 PMCID: PMC7317320 DOI: 10.1155/2020/2308017] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/21/2020] [Revised: 04/18/2020] [Accepted: 04/20/2020] [Indexed: 11/17/2022]
Abstract
This study demonstrates that Thelephora ganbajun had a strong ability to absorb zinc, and zinc can be compartmentally stored in the small vesicles and mainly accumulated in the form of zinc-enriched polysaccharides (zinc content was 25.0 ± 1.27 mg/g). Mycelia zinc polysaccharides (MZPS) and its fractions were isolated. The main fraction (MZPS-2) with the highest antioxidant activity in vitro was composed of mannose : galacturonic acid : glucose : galactose in a molar ratio of 61.19 : 1 : 39.67 : 48.67, with a weight-averaged molecular weight of 5.118 × 105 Da. MZPS-2 had both α-pyranose and β-pyranose configuration and had a triple helical conformation. By establishing zebrafish models, we found that MZPS-2 can significantly scavenge free radicals, reduce the generation of reactive oxygen species caused by inflammation, and inhibit the recruitment of neutrophils toward the injury site. Therefore, MZPS-2 exhibited antioxidant and anti-inflammatory effects and can be used as a zinc supplement with specific biological activities to alleviate zinc deficiency complications, such as chronic oxidative stress or inflammation.
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Affiliation(s)
- Lan Zheng
- Biology Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250103, China
- Shandong Provincial Key Laboratory of Biosensors, Jinan 250103, China
| | - Yaohong Ma
- Biology Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250103, China
- Shandong Provincial Key Laboratory of Biosensors, Jinan 250103, China
| | - Yunjuan Zhang
- Biology Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250103, China
| | - Qingjun Meng
- Biology Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250103, China
- Shandong Provincial Key Laboratory of Biosensors, Jinan 250103, China
| | - Junhui Yang
- Biology Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250103, China
- Shandong Provincial Key Laboratory of Biosensors, Jinan 250103, China
| | - Weili Gong
- Biology Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250103, China
- Shandong Provincial Key Laboratory of Biosensors, Jinan 250103, China
| | - Qingai Liu
- Biology Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250103, China
- Shandong Provincial Key Laboratory of Biosensors, Jinan 250103, China
| | - Lei Cai
- Biology Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250103, China
- Shandong Provincial Key Laboratory of Biosensors, Jinan 250103, China
| | - Lujiang Hao
- State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China
| | - Binglian Wang
- Biology Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250103, China
- Shandong Provincial Key Laboratory of Biosensors, Jinan 250103, China
| | - Yan Yang
- Biology Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250103, China
- Shandong Provincial Key Laboratory of Biosensors, Jinan 250103, China
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17
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Gu J, Zhang H, Yao H, Zhou J, Duan Y, Ma H. Comparison of characterization, antioxidant and immunological activities of three polysaccharides from Sagittaria sagittifolia L. Carbohydr Polym 2020; 235:115939. [PMID: 32122481 DOI: 10.1016/j.carbpol.2020.115939] [Citation(s) in RCA: 73] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2019] [Revised: 12/21/2019] [Accepted: 01/30/2020] [Indexed: 10/25/2022]
Abstract
To investigate and compare the preliminary structural characteristics and biological activity in vitro of polysaccharides from Sagittaria sagittifolia L. (SSs) by different extration methods, three polysaccharides (SSW, SSU, and SSP) were obtained with hot water, ultrasound-assisted, and subcritical water extraction. Their structural features were elucidated using High Performance Liquid Chromatography (HPLC), Gas Chromatography (GC), Scanning Electron Microscopy (SEM), Infrared Spectroscopy (IR), Atomic Force Microscopy (AFM), Zeta Potential and Congo red methods. Furthermore, the antioxidant activity and immunostimulatory effects were investigated in vitro. Molecular weight and monosaccharide composition analysis exhibited that SSW (2275.0 kDa), SSU (148.7 kDa), and SSP (1984.0 kDa) were heteropolysaccharide with dramatically different monosaccharide species and mole ratios. In addition, SSP exhibited stronger antioxidant activity in vitro and more potent immunomodulatory activity than SSW and SSU. SSP has greater potential to be explored as biologicalagents for use in complementary medicine or functional foods.
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Affiliation(s)
- Jinyan Gu
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, 212013, China
| | - Haihui Zhang
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, 212013, China; Institute of Food Physical Processing, Jiangsu University, Zhenjiang, 212013, China.
| | - Hui Yao
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, 212013, China
| | - Jie Zhou
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, 212013, China
| | - Yuqing Duan
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, 212013, China; Institute of Food Physical Processing, Jiangsu University, Zhenjiang, 212013, China.
| | - Haile Ma
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, 212013, China; Institute of Food Physical Processing, Jiangsu University, Zhenjiang, 212013, China
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18
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Preparation, characterization and bioactivity of polysaccharide fractions from Sagittaria sagittifolia L. Carbohydr Polym 2020; 229:115355. [DOI: 10.1016/j.carbpol.2019.115355] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2019] [Revised: 09/16/2019] [Accepted: 09/19/2019] [Indexed: 01/31/2023]
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19
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Dat LD, Tu NTM, Duc NV, Luyen BTT, Huyen CTT, Jang HJ, Thu DT, Huong TT, Tram LH, Thong NV, Hung ND, Kim YH, Thao NP. Anti-inflammatory secondary metabolites from the stems of Millettia dielsiana Harms ex Diels. Carbohydr Res 2019; 484:107778. [PMID: 31470215 DOI: 10.1016/j.carres.2019.107778] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2019] [Revised: 08/13/2019] [Accepted: 08/13/2019] [Indexed: 12/18/2022]
Abstract
A phytochemical investigation for the constituents of the stems of Millettia dielsiana Harms ex Diels resulted in the isolation of a new isoflavone glycoside, mildiside A (1), and 14 known compounds (2-15). Their chemical structures were determined using a combination of IR, NMR, MS, and optical rotation analysis, as well as comparison with the literature data. The ethanolic (EtOH) extract and several isolated compounds exert the inflammatory effect of nitric oxide (NO) production in lipopolysaccharide (LPS)-stimulated murine RAW264.7 macrophage cells.
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Affiliation(s)
- Le Duc Dat
- Division of Computational Physics, Institute for Computational Science, Ton Duc Thang University, Ho Chi Minh City, Viet Nam; Faculty of Pharmacy, Ton Duc Thang University, Ho Chi Minh City, Viet Nam.
| | - Nguyen Thi Minh Tu
- School of Biotechnology and Food Technology, Hanoi University of Science and Technology, Hanoi, Viet Nam.
| | - Ngo Viet Duc
- Faculty of Pharmacy, Ton Duc Thang University, Ho Chi Minh City, Viet Nam.
| | | | | | - Hyun Jae Jang
- Immunoregulatory Material Research Center, Korea Research Institute of Bioscience and Biotechnology, Jeonbuk, 56212, Republic of Korea.
| | - Dang Thi Thu
- School of Biotechnology and Food Technology, Hanoi University of Science and Technology, Hanoi, Viet Nam.
| | - Tran Thu Huong
- School of Chemical Engineering, Hanoi University of Science and Technology, Hanoi, Viet Nam.
| | - Le Huyen Tram
- School of Chemical Engineering, Hanoi University of Science and Technology, Hanoi, Viet Nam.
| | - Nguyen Van Thong
- School of Chemical Engineering, Hanoi University of Science and Technology, Hanoi, Viet Nam.
| | - Nguyen Duc Hung
- Centre for Drug Research and Technology Transfer, Phutho College of Medicine and Pharmacy, Viettri City, Phutho Province, Viet Nam
| | - Young Ho Kim
- College of Pharmacy, Chungnam National University, Daejeon, 34134, Republic of Korea.
| | - Nguyen Phuong Thao
- Institute of Marine Biochemistry, Vietnam Academy of Science and Technology (VAST), 18 Hoang Quoc Viet, Caugiay, Hanoi, Viet Nam.
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20
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Wu S, Zhang X, Liu J, Song J, Yu P, Chen P, Liao Z, Wu M, Tong H. Physicochemical characterization of Sargassum fusiforme fucoidan fractions and their antagonistic effect against P-selectin-mediated cell adhesion. Int J Biol Macromol 2019; 133:656-662. [PMID: 30930270 DOI: 10.1016/j.ijbiomac.2019.03.218] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2019] [Revised: 03/28/2019] [Accepted: 03/28/2019] [Indexed: 12/22/2022]
Abstract
P-selectin, mediated adhesion between endothelium and neutrophils, is a promising target for the therapeutics of acute inflammatory-related diseases. It is reported that brown algal fucoidans can antagonize P-selectin function. However, the fractionation and physicochemical characterization of Sargassum fusiforme fucoidan, and the screening of fucoidan fractions with P-selectin antagonistic capability have not been investigated. In this study, we isolated and fractionated systematically the S. fusiforme fucoidan by ion-exchange chromatography and size exclusion chromatography to obtain eight fucoidan fractions. Their physicochemical characterization was determined by chemical methods, HPLC and FT-IR. The inhibitory capacity of the fucoidan fractions in P-selectin-mediated leukocyte adhesion was evaluated by static adhesion assay and parallel-plate flow chamber. Results showed that fucoidan fractions possessed distinct physicochemical properties, including total carbohydrate, uronic acid and sulfate contents, molecular weight, and monosaccharide compositions. Among all the fucoidan fractions, SFF-32 and SFF-42 showed better blocking ability against P-selectin-mediated cell adhesion.
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Affiliation(s)
- Siya Wu
- College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China
| | - Xu Zhang
- College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China
| | - Jian Liu
- College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China
| | - Jianxi Song
- Analytical and Testing Center, Beihua University, Jilin 132013, China
| | - Ping Yu
- College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China
| | - Peichao Chen
- College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China
| | - Zhiyong Liao
- College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China
| | - Mingjiang Wu
- College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China.
| | - Haibin Tong
- College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China.
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21
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Cheng Y, Sibusiso L, Hou L, Jiang H, Chen P, Zhang X, Wu M, Tong H. Sargassum fusiforme fucoidan modifies the gut microbiota during alleviation of streptozotocin-induced hyperglycemia in mice. Int J Biol Macromol 2019; 131:1162-1170. [PMID: 30974142 DOI: 10.1016/j.ijbiomac.2019.04.040] [Citation(s) in RCA: 83] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2018] [Revised: 03/27/2019] [Accepted: 04/07/2019] [Indexed: 12/31/2022]
Abstract
Diabetes is a complicated endocrine and metabolic disorder, which has become an epidemic health issue worldwide. Fucoidan is extensively distributed in the brown algae and several marine invertebrates exhibiting diverse biological activities. In the present study, the physicochemical property of Sargassum fusiforme fucoidan (SFF) and its effects on streptozotocin (STZ)-induced diabetic mice and gut microbiota were investigated. Diabetes mice not only showed abnormal blood glucose, but also accompanied by multiple symptoms, such as gradual emaciation, decreased body weight, increased food and water intake. Compared with diabetic mice after 6-week treatment, administration of SFF significantly decreased the fasting blood glucose, diet and water intake. Furthermore, SFF attenuated the pathological change in the heart and liver, improved the liver function, and suppressed oxidative stress in STZ-induced diabetic mice. Simultaneously, SFF significantly altered the gut microbiota in the faeces of diabetic mice, decreased the relative abundances of the diabetes-related intestinal bacteria, which is a potential mechanism for relieving the symptoms of diabetes. Therefore, SFF might be considered as one of the promising complementary and alternative medicines for the management of diabetes mellitus in future.
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Affiliation(s)
- Yang Cheng
- College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China
| | - Luthuli Sibusiso
- College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China
| | - Lingfeng Hou
- College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China
| | - Huijing Jiang
- College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China
| | - Peichao Chen
- College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China
| | - Xu Zhang
- College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China
| | - Mingjiang Wu
- College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China.
| | - Haibin Tong
- College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China.
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