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Li Y, Sun J, Fu Z, He Y, Chen X, Wang S, Zhang L, Jian J, Yang W, Liu C, Liu X, Yang Y, Bai Z. Engineering the L-tryptophan metabolism for efficient de novo biosynthesis of tryptophol in Saccharomyces cerevisiae. BIOTECHNOLOGY FOR BIOFUELS AND BIOPRODUCTS 2024; 17:130. [PMID: 39415302 DOI: 10.1186/s13068-024-02576-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2024] [Accepted: 10/05/2024] [Indexed: 10/18/2024]
Abstract
Tryptophol (IET) is a metabolite derived from L-tryptophan that can be isolated from plants, bacteria, and fungi and has a wide range of biological activities in living systems. Despite the fact that IET biosynthesis pathways exist naturally in living organisms, industrial-scale production of IET and its derivatives is solely based on environmentally unfriendly chemical conversion. With diminishing petroleum reserves and a significant increase in global demand in all major commercial segments, it becomes essential to develop new technologies to produce chemicals from renewable resources and under mild conditions, such as microbial fermentation. Here we characterized and engineered the less-studied L-tryptophan pathway and IET biosynthesis in the baker's yeast Saccharomyces cerevisiae, with the goal of investigating microbial fermentation as an alternative/green strategy to produce IET. In detail, we divided the aromatic amino acids (AAAs) metabolism related to IET synthesis into the shikimate pathway, the L-tryptophan pathway, the competing L-tyrosine/L-phenylalanine pathways, and the Ehrlich pathway based on a modular engineering concept. Through stepwise engineering of these modules, we obtained a yeast mutant capable of producing IET up to 1.04 g/L through fed-batch fermentation, a ~ 650-fold improvement over the wild-type strain. Besides, our engineering process also revealed many insights about the regulation of AAAs metabolism in S. cerevisiae. Finally, during our engineering process, we also discovered yeast mutants that accumulate anthranilate and L-tryptophan, both of which are precursors of various valuable secondary metabolites from fungi and plants. These strains could be developed to the chassis for natural product biosynthesis upon introducing heterologous pathways.
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Affiliation(s)
- Ye Li
- Key Laboratory of Industrial Biotechnology of Ministry of Education and School of Biotechnology, Jiangnan University, Wuxi, 214122, China.
| | - Jingzhen Sun
- Key Laboratory of Industrial Biotechnology of Ministry of Education and School of Biotechnology, Jiangnan University, Wuxi, 214122, China
| | - Zhenhao Fu
- Key Laboratory of Industrial Biotechnology of Ministry of Education and School of Biotechnology, Jiangnan University, Wuxi, 214122, China
| | - Yubing He
- Key Laboratory of Industrial Biotechnology of Ministry of Education and School of Biotechnology, Jiangnan University, Wuxi, 214122, China
| | - Xiaorui Chen
- Key Laboratory of Industrial Biotechnology of Ministry of Education and School of Biotechnology, Jiangnan University, Wuxi, 214122, China
| | - Shijie Wang
- Key Laboratory of Industrial Biotechnology of Ministry of Education and School of Biotechnology, Jiangnan University, Wuxi, 214122, China
| | - Lele Zhang
- Key Laboratory of Industrial Biotechnology of Ministry of Education and School of Biotechnology, Jiangnan University, Wuxi, 214122, China
- Wuxi Tmaxtree Biotechnology Co. Ltd., Wuxi, 214072, China
| | - Jiansheng Jian
- Wuxi Tmaxtree Biotechnology Co. Ltd., Wuxi, 214072, China
| | - Weihua Yang
- Changxing Pharmaceutical Co. Ltd., Huzhou, 313100, China
| | - Chunli Liu
- Key Laboratory of Industrial Biotechnology of Ministry of Education and School of Biotechnology, Jiangnan University, Wuxi, 214122, China
| | - Xiuxia Liu
- Key Laboratory of Industrial Biotechnology of Ministry of Education and School of Biotechnology, Jiangnan University, Wuxi, 214122, China
| | - Yankun Yang
- Key Laboratory of Industrial Biotechnology of Ministry of Education and School of Biotechnology, Jiangnan University, Wuxi, 214122, China
| | - Zhonghu Bai
- Key Laboratory of Industrial Biotechnology of Ministry of Education and School of Biotechnology, Jiangnan University, Wuxi, 214122, China.
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Xu Y, Liang X, Hyun CG. Isolation, Characterization, Genome Annotation, and Evaluation of Tyrosinase Inhibitory Activity in Secondary Metabolites of Paenibacillus sp. JNUCC32: A Comprehensive Analysis through Molecular Docking and Molecular Dynamics Simulation. Int J Mol Sci 2024; 25:2213. [PMID: 38396889 PMCID: PMC10889091 DOI: 10.3390/ijms25042213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2024] [Revised: 02/05/2024] [Accepted: 02/05/2024] [Indexed: 02/25/2024] Open
Abstract
A potential strain, Paenibacillus sp. JNUCC32, was isolated and subjected to whole-genome sequencing. Genome functional annotation revealed its active metabolic capabilities. This study aimed to investigate the pivotal secondary metabolites in the biological system. Fermentation and extraction were performed, resulting in the isolation of seven known compounds: tryptophol (1), 3-(4-hydroxyphenyl)propionic acid (2), ferulic acid (3), maculosin (4), brevianamide F (5), indole-3-acetic acid (6), and butyric acid (7). Tryptophol exhibited favorable pharmacokinetic properties and demonstrated certain tyrosinase inhibitory activity (IC50 = 999 μM). For further analysis of its inhibition mechanism through molecular docking and molecular dynamics (MD) simulation, tryptophol formed three hydrogen bonds and a pro-Michaelis complex with tyrosinase (binding energy = -5.3 kcal/mol). The MD simulation indicated favorable stability for the tryptophol-mushroom tyrosinase complex, primarily governed by hydrogen bond interactions. The crucial residues VAL-283 and HIS-263 in the docking were also validated. This study suggests tryptophol as a potential candidate for antibrowning agents and dermatological research.
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Affiliation(s)
| | | | - Chang-Gu Hyun
- Department of Beauty and Cosmetology, Jeju Inside Agency and Cosmetic Science Center, Jeju National University, Jeju 63243, Republic of Korea; (Y.X.); (X.L.)
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Effects of tryptophan and phenylalanine on tryptophol production in Saccharomyces cerevisiae revealed by transcriptomic and metabolomic analyses. J Microbiol 2022; 60:832-842. [DOI: 10.1007/s12275-022-2059-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2022] [Revised: 05/02/2022] [Accepted: 05/03/2022] [Indexed: 10/18/2022]
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Zhang XL, Zheng Y, Xia ML, Wu YN, Liu XJ, Xie SK, Wu YF, Wang M. Knowledge Domain and Emerging Trends in Vinegar Research: A Bibliometric Review of the Literature from WoSCC. Foods 2020; 9:E166. [PMID: 32050682 PMCID: PMC7074530 DOI: 10.3390/foods9020166] [Citation(s) in RCA: 63] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2020] [Revised: 01/31/2020] [Accepted: 02/06/2020] [Indexed: 12/22/2022] Open
Abstract
Vinegar is one of the most widely used acidic condiments. In recent decades, rapid advances have been made in the area of vinegar research, and the intellectual structure pertaining to this domain has significantly evolved. Thus, it is important that scientists keep abreast of associated developments to ensure an appropriate understanding of this field. To facilitate this current study, a bibliometric analysis method was adopted to visualize the knowledge map of vinegar research based on literature data retrieved from the Web of Science Core Collection (WoSCC) database. In total, 883 original research and review articles from between 1998 and 2019 with 19,663 references were analyzed by CiteSpace. Both a macroscopical sketch and microscopical characterization of the whole knowledge domain were realized. According to the research contents, the main themes that underlie vinegar research can be divided into six categories, that is, microorganisms, substances, health functions, production technologies, adjuvant medicines, and vinegar residues. In addition to the latter analysis, emerging trends and future research foci were predicted. Finally, the evolutionary stage of vinegar research was discerned according to Shneider's four-stage theory. This review will help scientists to discern the dynamic evolution of vinegar research, as well as highlight areas for future research.
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Affiliation(s)
| | | | | | | | | | | | | | - Min Wang
- State Key Laboratory of Food Nutrition and Safety, Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, College of Biotechnology, Tianjin University of Science & Technology, Tianjin 300457, China; (X.-L.Z.); (Y.Z.); (M.-L.X.); (Y.-N.W.); (X.-J.L.); (S.-K.X.); (Y.-F.W.)
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Lynch KM, Zannini E, Wilkinson S, Daenen L, Arendt EK. Physiology of Acetic Acid Bacteria and Their Role in Vinegar and Fermented Beverages. Compr Rev Food Sci Food Saf 2019; 18:587-625. [DOI: 10.1111/1541-4337.12440] [Citation(s) in RCA: 64] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2018] [Revised: 02/06/2019] [Accepted: 02/18/2019] [Indexed: 12/16/2022]
Affiliation(s)
- Kieran M. Lynch
- School of Food and Nutritional SciencesUniv. College Cork Cork T12 K8AF Ireland
| | - Emanuele Zannini
- School of Food and Nutritional SciencesUniv. College Cork Cork T12 K8AF Ireland
| | - Stuart Wilkinson
- Global Innovation & Technology CentreAnheuser‐Busch InBev nv/sa Leuven 3000 Belgium
| | - Luk Daenen
- Global Innovation & Technology CentreAnheuser‐Busch InBev nv/sa Leuven 3000 Belgium
| | - Elke K. Arendt
- School of Food and Nutritional SciencesUniv. College Cork Cork T12 K8AF Ireland
- APC Microbiome IrelandUniv. College Cork Cork T12 K8AF Ireland
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Palmieri A, Petrini M. Tryptophol and derivatives: natural occurrence and applications to the synthesis of bioactive compounds. Nat Prod Rep 2019; 36:490-530. [DOI: 10.1039/c8np00032h] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
This report presents some fundamental aspects related to the natural occurrence and bioactivity of tryptophol as well as the synthesis of tryptophols and their utilization for the preparation of naturally occurring alkaloid metabolites embedding the indole system.
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Affiliation(s)
- Alessandro Palmieri
- School of Science and Technology
- Chemistry Division
- University of Camerino
- Italy
| | - Marino Petrini
- School of Science and Technology
- Chemistry Division
- University of Camerino
- Italy
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Prophetic medicine as potential functional food elements in the intervention of cancer: A review. Biomed Pharmacother 2017; 95:614-648. [DOI: 10.1016/j.biopha.2017.08.043] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2017] [Revised: 08/05/2017] [Accepted: 08/07/2017] [Indexed: 01/01/2023] Open
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Chen H, Chen T, Giudici P, Chen F. Vinegar Functions on Health: Constituents, Sources, and Formation Mechanisms. Compr Rev Food Sci Food Saf 2016; 15:1124-1138. [PMID: 33401833 DOI: 10.1111/1541-4337.12228] [Citation(s) in RCA: 103] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2016] [Revised: 08/24/2016] [Accepted: 08/25/2016] [Indexed: 11/30/2022]
Abstract
Vinegars are one of only a few acidic condiments throughout the world. Vinegars can mainly be considered grain vinegars and fruit vinegars, according to the raw materials used. Both grain vinegars and fruit vinegars, which are fermented by traditional methods, possess a variety of physiological functions, such as antibacteria, anti-infection, antioxidation, blood glucose control, lipid metabolism regulation, weight loss, and anticancer activities. The antibacteria and anti-infection abilities of vinegars are mainly due to the presence of organic acids, polyphenols, and melanoidins. The polyphenols and melanoidins also provide the antioxidant abilities of vinegars, which are produced from the raw materials and fermentation processes, respectively. The blood glucose control, lipid metabolism regulation, and weight loss capabilities from vinegars are mainly due to acetic acid. Besides caffeoylsophorose (inhibits disaccharidase) and ligustrazine (improves blood circulation), other functional ingredients present in vinegars provide certain health benefits as well. Regarding anticancer activities, several grain vinegars strongly inhibit the growth of some cancer cells in vivo or in vitro, but related functional ingredients remain largely unknown, except tryptophol in Japanese black soybean vinegar. Considering the discovering of various functional ingredients and clarifying their mechanisms, some vinegars could be functional foods or even medicines, depending on a number of proofs that demonstrate these constituents can cure chronic diseases such as diabetes or cardiovascular problems.
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Affiliation(s)
- Hengye Chen
- Key Laboratory of Environment Correlative Dietology and College of Food Science and Technology, Huazhong Agricultural Uni, Wuhan, 430070, Hubei Province, People's Republic of China
| | - Tao Chen
- Key Laboratory of Environment Correlative Dietology and College of Food Science and Technology, Huazhong Agricultural Uni, Wuhan, 430070, Hubei Province, People's Republic of China
| | - Paolo Giudici
- Dept. of Life Sciences, Uni. of Modena and Reggio Emilia, Via Amendola, 2, 42122, Reggio Emilia, Italy
| | - Fusheng Chen
- Key Laboratory of Environment Correlative Dietology and College of Food Science and Technology, Huazhong Agricultural Uni, Wuhan, 430070, Hubei Province, People's Republic of China
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Wu YY, Liu HY, Huang TC, Chen JH, Chang PY, Ho CL, Chao TY. A phase II double-blinded study to evaluate the efficacy of EW02 in reducing chemotherapy-induced neutropenia in breast cancer. Oncol Lett 2015; 10:1793-1798. [PMID: 26622752 DOI: 10.3892/ol.2015.3492] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2014] [Accepted: 06/03/2015] [Indexed: 11/06/2022] Open
Abstract
EW02, a polysaccharide-enriched crude extract from black soybean, has been shown to assist hematopoiesis in chemotherapy-treated animals. The present study aimed to clarify the safety, quality of life (QOL) and efficacy for myelopoiesis of EW02 administration in early breast cancer (EBC) patients receiving adjuvant chemotherapy. A total of 60 eligible EBC patients were enrolled in a randomized, double-blinded trial, 40 of whom were prescribed 700 mg oral EW02 three times daily for 15 days in chemotherapy cycle (C)2. The remainder were prescribed a placebo. All subjects took EW02 in C3 for 15 days. Blood samples were collected at different time-points for determining the blood cell count, and the serum level of granulocyte colony-stimulating factor (G-CSF) and interleukin (IL)-6. All patients tolerated EW02 well without severe side-effects. QOL evaluation showed that only the score of one questionnaire section (QLQ-C30) was significantly increased at C1 day (D)8 to C2D8 when the EW02 and placebo groups were compared (P=0.045). No significant myelopoiesis recovery, and no incremental change in IL-6 and G-CSF levels were found in C2. Subgroup analysis showed a slightly lower decrease in absolute neutrophil count (ANC) in the EW02 patients who underwent Adriamycin + cyclophosphamide treatment compared with the placebo group. Although EW02 failed to show efficacy for myelopoiesis in the present study, EW02 was still well tolerated in EBC patients who underwent adjuvant chemotherapy.
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Affiliation(s)
- Yi-Ying Wu
- Division of Hematology and Oncology, Department of Medicine, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan, R.O.C. ; Graduate Institute of Life Sciences, National Defense Medical Center, Taipei, Taiwan, R.O.C
| | - Hsin-Yi Liu
- Division of Hematology and Oncology, Department of Medicine, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan, R.O.C
| | - Tzu-Chuan Huang
- Division of Hematology and Oncology, Department of Medicine, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan, R.O.C
| | - Jia-Hong Chen
- Division of Hematology and Oncology, Department of Medicine, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan, R.O.C. ; Institute of Clinical Medicine, Taipei Medical University, Shuang-Ho Hospital, New Taipei, Taiwan, R.O.C
| | - Ping-Ying Chang
- Division of Hematology and Oncology, Department of Medicine, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan, R.O.C
| | - Ching-Liang Ho
- Division of Hematology and Oncology, Department of Medicine, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan, R.O.C
| | - Tsu-Yi Chao
- Graduate Institute of Life Sciences, National Defense Medical Center, Taipei, Taiwan, R.O.C. ; Institute of Clinical Medicine, Taipei Medical University, Shuang-Ho Hospital, New Taipei, Taiwan, R.O.C. ; Division of Hematology and Oncology, Department of Medicine, Taipei Medical University, Shuang-Ho Hospital, New Taipei, Taiwan, R.O.C
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Inagaki S, Morimura S, Tang Y, Akutagawa H, Kida K. Tryptophol Induces Death Receptor (DR) 5-Mediated Apoptosis in U937 Cells. Biosci Biotechnol Biochem 2014; 71:2065-8. [PMID: 17690453 DOI: 10.1271/bbb.70084] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Tryptophol is a natural component isolated from vinegar produced from the boiled extract of black soybean. We have reported that tryptophol induces apoptosis in U937 cells via activation of caspase-8 followed by caspase-3. Tryptophol, however, did not affect human peripheral blood lymphocytes (PBL). In this study, we found that tryptophol enhances formation of a death-inducing signaling complex including death receptor (DR) 5. Cell viability and induction of apoptosis by tryptophol was reduced by transfection with decoy receptor (DcR) 1. These results indicate that tryptophol induces apoptosis through DR5 and that the resistance of PBL to tryptophol-induced apoptosis might be due to competition from DcR1.
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Affiliation(s)
- Shyuichiro Inagaki
- Graduate School of Science and Technology, Department of Materials and Life Science, Kumamoto University, Kurokami, Kumamoto, Japan
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Inagaki S, Kato T, Ichige K. Cytotoxicity and Apoptosis-Inducing Effect of Soybean Broth Cultured with Microorganisms Used in the Production of Fermented Soybean Foods on Human Monoblastic Leukemia U937 Cells. FOOD SCIENCE AND TECHNOLOGY RESEARCH 2014. [DOI: 10.3136/fstr.20.499] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Assessment of tryptophol genotoxicity in four cell lines in vitro: a pilot study with alkaline comet assay. Arh Hig Rada Toksikol 2011; 62:41-9. [PMID: 21421532 DOI: 10.2478/10004-1254-62-2011-2090] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Tryptophol is an aromatic alcohol and secondary metabolite of the opportunistic fungus Candida albicans. Although its toxicity profile at cell level has been poorly investigated, recent data point to cytotoxic, cytostatic, and genotoxic effects in lymphocytes and the induction of apoptosis in leukaemic blood monocytes. In this pilot study we evaluated the genotoxicity of tryptophol in vitro on four permanent cell lines of animal and human origin: ovary cells, alveolar epithelium, liver cells, and blood monocytes using the alkaline comet assay. We selected cells that might be principal targets of tryptophol and other low-molecular geno(toxins) secreted by Candida albicans during host invasion. Our results suggest that tryptophol applied in vitro at 2 mmol L(-1) for 24 h damages DNA in HepG2, A549 and THP-1 cells, obviously due to bioactivation and/or decomposition of the parent compound, which results in the formation of more genotoxic compound(s) and production of reactive species that additionally damage DNA. On the other hand, notably lower levels of primary DNA damage were recorded in CHO cells, which lack metabolic activity. Future studies with tryptophol should look further into mechanisms involved in its toxic action and should focus on other cell types prone to infection with Candida spp. such as vaginal epithelial cells or keratinocytes of human origin.
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Zou Y, Chang SKC. Effect of black soybean extract on the suppression of the proliferation of human AGS gastric cancer cells via the induction of apoptosis. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2011; 59:4597-605. [PMID: 21462927 DOI: 10.1021/jf104945x] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Black soybean is known to have a health-promoting effect because of its high content of polyphenolic compounds and antioxidant activities. The objective of the present study was to investigate the chemopreventive effects of black soybean extract against human AGS gastric cancer cells and its possible mechanism in inducing apoptosis. Black soybean extract was obtained by extracting black soybean with acidified aqueous acetone, and its phytochemical constituents, as determined by HPLC-DAD methods, were demonstrated to contain various phenolics. The black soybean extract inhibited AGS cell growth in a dose-dependent manner with an IC(50) of 3.69 mg/mL as measured by the MTT assay. This growth inhibition effect was further confirmed by the CFDA-SE assay. Flow cytometry analysis showed that black soybean extract dose-dependently induced apoptosis of AGS cells. Moreover, the involvement of black soybean extract in inducing apoptosis was confirmed by the expression of Bax, Bcl-2, caspase-3, and PARP. The results of the present study indicated that black soybean extract could be used as an apoptosis inducer in AGS cells and a natural chemopreventive agent in the treatment of human gastric cancer.
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Affiliation(s)
- Yanping Zou
- Department of Cereal and Food Science, North Dakota State University , Fargo, North Dakota 58108-6050, United States
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Ozhan Aytekin A, Morimura S, Kida K. Physiological activities of chitosan and N
-trimethyl chitosan chloride in U937 and 3T3-L1 cells. POLYM ADVAN TECHNOL 2010. [DOI: 10.1002/pat.1856] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Salkowski's reagent test as a primary screening index for functionalities of rhizobacteria isolated from wild dipterocarp saplings growing naturally on medium-strongly acidic tropical peat soil. Biosci Biotechnol Biochem 2010; 74:2202-8. [PMID: 21071871 DOI: 10.1271/bbb.100360] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Rhizobacteria isolated from wild dipterocarp saplings in Central Kalimantan, Indonesia, were subjected to Salkowski's reagent test, which is often used in detecting indolic substances. Among 69 isolates grown in a low-nitrogen medium supplemented with L-tryptophan (TRP), culture fluids of 29 strains were positive to the test, in which 17 bacteria turned red and other 10 pink. All the red type rhizobacteria actively converted TRP into tryptophol (TOL), while some yielded indole-3-acetic acid (IAA) with TOL production. They also showed a capacity to decompose gallotannin into pyrogallol via gallic acid. On the other hand, an active IAA-producing Serratia sp. CK67, and three Fe-solubilizing Burkholderia spp. CK28, CK43, and Citrobacter sp. CK42, were all involved in pink type rhizobacteria, which were more effective, oxidative TRP-degraders than the red type rhizobacteria. Thus, Salkowski's reagent test should be a useful primary index in the screening of functional rhizobacteria in peatland ecosystem.
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Xu B, Chang SKC. Antioxidant capacity of seed coat, dehulled bean, and whole black soybeans in relation to their distributions of total phenolics, phenolic acids, anthocyanins, and isoflavones. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2008; 56:8365-73. [PMID: 18729453 DOI: 10.1021/jf801196d] [Citation(s) in RCA: 96] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Black soybeans have been used as an excellent dietary source for disease prevention and health promotion in China for hundreds of years. However, information about the distribution of health-promoting phenolic compositions in different physical parts of black soybean and the contribution of phenolic compositions to overall antioxidant capacity is limited. To elucidate the distribution of phenolic composition and their contribution to antioxidant activities in black soybean, the total and individual phenolic profiles, and antioxidant capacities of seed coat, dehulled and whole black soybean were systematically investigated. The seed coat exhibited much higher total phenolic indexes and antioxidant activities than whole and dehulled black soybean. Dehulled black soybean possessed similar levels of total phenolic content, total flavonoid content, 2-diphenyl-1-picryhydrazyl (DPPH) radical scavenging activity, ferric reducing antioxidant power (FRAP), and oxygen radical absorbance capacity (ORAC) activities as compared to whole yellow soybean. Cyanidin-3-glucoside, petunidin-3-glucoside, and peonidin-3-glucoside were detected in the seed coat but not in dehulled black soybean and yellow soybean. Among benzoic acid detected, caffeic and chlorogenic acid were the predominant phenolic acids. Whole black soybean and dehulled black soybean exhibited similar isoflavone contents in 7- O-beta-glucosides and malonylglucosides of daidzein and genistein. The seed coat possessed significantly ( p < 0.05) lower 7- O-beta-glucosides and malonylglucosides of daidzein and genistein, acetylglycitin, and total isoflavones than whole and dehulled black soybean. The contribution of phenolics in the seed coat to the antioxidant activity of black soybean parts depends on the assay methods. When measured with the DPPH and FRAP methods, the seed coat contributed 90% of the total antioxidant capacity of black soybean. However, when measured with the ORAC method, the seed coat and dehulled portion contributed approximately equally the total antioxidant capacity of black soybeans. The information generated from this study on the distribution and content of their active components is useful for the effective use of black soybeans as an ingredient for promoting health.
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Affiliation(s)
- Baojun Xu
- Department of Cereal and Food Sciences, North Dakota State University, Fargo, North Dakota 58105, USA
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Kosalec I, Šafranić A, Pepeljnjak S, Bačun-Družina V, Ramić S, Kopjar N. Genotoxicity of Tryptophol in a Battery of Short-Term Assays on Human White Blood Cells in vitro. Basic Clin Pharmacol Toxicol 2008; 102:443-52. [DOI: 10.1111/j.1742-7843.2007.00204.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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