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Riegelman E, Xue KS, Wang JS, Tang L. Gut-Brain Axis in Focus: Polyphenols, Microbiota, and Their Influence on α-Synuclein in Parkinson's Disease. Nutrients 2024; 16:2041. [PMID: 38999791 PMCID: PMC11243524 DOI: 10.3390/nu16132041] [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: 06/11/2024] [Revised: 06/20/2024] [Accepted: 06/25/2024] [Indexed: 07/14/2024] Open
Abstract
With the recognition of the importance of the gut-brain axis in Parkinson's disease (PD) etiology, there is increased interest in developing therapeutic strategies that target α-synuclein, the hallmark abhorrent protein of PD pathogenesis, which may originate in the gut. Research has demonstrated that inhibiting the aggregation, oligomerization, and fibrillation of α-synuclein are key strategies for disease modification. Polyphenols, which are rich in fruits and vegetables, are drawing attention for their potential role in this context. In this paper, we reviewed how polyphenols influence the composition and functional capabilities of the gut microbiota and how the resulting microbial metabolites of polyphenols may potentially enhance the modulation of α-synuclein aggregation. Understanding the interaction between polyphenols and gut microbiota and identifying which specific microbes may enhance the efficacy of polyphenols is crucial for developing therapeutic strategies and precision nutrition based on the microbiome.
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Affiliation(s)
- Elizabeth Riegelman
- Department of Environmental Health Science, University of Georgia, Athens, GA 30602, USA
| | - Kathy S Xue
- Department of Environmental Health Science, University of Georgia, Athens, GA 30602, USA
| | - Jia-Sheng Wang
- Department of Environmental Health Science, University of Georgia, Athens, GA 30602, USA
| | - Lili Tang
- Department of Environmental Health Science, University of Georgia, Athens, GA 30602, USA
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2
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Sun L, Su Y, Hu K, Li D, Guo H, Xie Z. Microbial-Transferred Metabolites of Black Tea Theaflavins by Human Gut Microbiota and Their Impact on Antioxidant Capacity. Molecules 2023; 28:5871. [PMID: 37570841 PMCID: PMC10420933 DOI: 10.3390/molecules28155871] [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: 06/20/2023] [Revised: 07/22/2023] [Accepted: 08/01/2023] [Indexed: 08/13/2023] Open
Abstract
Theaflavins (TFs), the primary bioactive components in black tea, are poorly absorbed in the small intestine. However, the biological activity of TFs does not match their low bioavailability, which suggests that the gut microbiota plays a crucial role in their biotransformation and activities. In this study, we aimed to investigate the biotransferred metabolites of TFs produced by the human gut microbiota and these metabolites' function. We profiled the microbial metabolites of TFs by in vitro anaerobic human gut microbiota fermentation using liquid chromatography tandem mass spectrometry (LC-MS/MS) methods. A total of 17 microbial metabolites were identified, and their corresponding metabolic pathways were proposed. Moreover, full-length 16S rRNA gene sequence analysis revealed that the TFs altered the gut microbiota diversity and increased the relative abundance of specific members of the microbiota involved in the catabolism of the TFs, including Flavonifractor_plautii, Bacteroides_uniformis, Eubacterium_ramulus, etc. Notably, the antioxidant capacity of the TF sample increased after fermentation compared to the initial sample. In conclusion, the results contribute to a more comprehensive understanding of the microbial metabolites and antioxidant capacity of TFs.
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Affiliation(s)
- Li Sun
- State Key Laboratory of Tea Plant Biology and Utilization, School of Tea and Food Sciences and Technology, Anhui Agricultural University, Hefei 230036, China; (L.S.); (D.L.); (H.G.)
- The College of Pharmacy, Anhui University of Chinese Medicine, Hefei 230012, China; (Y.S.); (K.H.)
| | - You Su
- The College of Pharmacy, Anhui University of Chinese Medicine, Hefei 230012, China; (Y.S.); (K.H.)
| | - Kaiyin Hu
- The College of Pharmacy, Anhui University of Chinese Medicine, Hefei 230012, China; (Y.S.); (K.H.)
| | - Daxiang Li
- State Key Laboratory of Tea Plant Biology and Utilization, School of Tea and Food Sciences and Technology, Anhui Agricultural University, Hefei 230036, China; (L.S.); (D.L.); (H.G.)
| | - Huimin Guo
- State Key Laboratory of Tea Plant Biology and Utilization, School of Tea and Food Sciences and Technology, Anhui Agricultural University, Hefei 230036, China; (L.S.); (D.L.); (H.G.)
- Center for Biotechnology, Anhui Agricultural University, Hefei 230036, China
| | - Zhongwen Xie
- State Key Laboratory of Tea Plant Biology and Utilization, School of Tea and Food Sciences and Technology, Anhui Agricultural University, Hefei 230036, China; (L.S.); (D.L.); (H.G.)
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3
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Beneficial Effects of Theaflavins on Metabolic Syndrome: From Molecular Evidence to Gut Microbiome. Int J Mol Sci 2022; 23:ijms23147595. [PMID: 35886943 PMCID: PMC9317877 DOI: 10.3390/ijms23147595] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2022] [Revised: 07/02/2022] [Accepted: 07/06/2022] [Indexed: 02/04/2023] Open
Abstract
In recent years, many natural foods and herbs rich in phytochemicals have been proposed as health supplements for patients with metabolic syndrome (MetS). Theaflavins (TFs) are a polyphenol hydroxyl substance with the structure of diphenol ketone, and they have the potential to prevent and treat a wide range of MetS. However, the stability and bioavailability of TFs are poor. TFs have the marvelous ability to alleviate MetS through antiobesity and lipid-lowering (AMPK-FoxO3A-MnSOD, PPAR, AMPK, PI3K/Akt), hypoglycemic (IRS-1/Akt/GLUT4, Ca2+/CaMKK2-AMPK, SGLT1), and uric-acid-lowering (XO, GLUT9, OAT) effects, and the modulation of the gut microbiota (increasing beneficial gut microbiota such as Akkermansia and Prevotella). This paper summarizes and updates the bioavailability of TFs, and the available signaling pathways and molecular evidence on the functionalities of TFs against metabolic abnormalities in vitro and in vivo, representing a promising opportunity to prevent MetS in the future with the utilization of TFs.
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4
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Tea phenolics as prebiotics. Trends Food Sci Technol 2022. [DOI: 10.1016/j.tifs.2022.06.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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5
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Wang M, Li J, Hu T, Zhao H. Metabolic fate of tea polyphenols and their crosstalk with gut microbiota. FOOD SCIENCE AND HUMAN WELLNESS 2022. [DOI: 10.1016/j.fshw.2021.12.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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6
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Zhang S, Ohland C, Jobin C, Sang S. Degradation of black tea theaflavin through C-ring cleavage by gut microbiota. FOOD SCIENCE AND HUMAN WELLNESS 2022. [DOI: 10.1016/j.fshw.2021.12.016] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Luo T, Jiang JG. Anticancer Effects and Molecular Target of Theaflavins from Black Tea Fermentation in Vitro and in Vivo. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2021; 69:15052-15065. [PMID: 34878780 DOI: 10.1021/acs.jafc.1c05313] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Black tea is one of the most popular beverages in the world, and numerous epidemiological studies have shown that drinking black tea is good for health. As a natural tea pigment formed during the fermentation of black tea, the content of theaflavins accounts for only 2-6% of the dry weight of black tea, but they have a great impact on the color and taste of black tea soup. Recently, a large number of studies have shown that theaflavins have a significant anticancer effect. In this Perspective, we first state the physical and chemical properties, separation and purification methods, and biological formation pathways of theaflavins and analyze their safety and oral bioavailability and the structure-activity relationship of their antioxidant and anticancer activities; then, we describe in detail their anticancer effect in vitro and in vivo and highlight their various molecular targets involved in cancer inhibition. The anticancer molecular targets of theaflavins are mainly cell-cycle regulatory proteins, apoptosis-related proteins, cell-migration-related proteins, and growth transcription factors. Finally, the possibility of developing new health-care food based on theaflavins is discussed. This Perspective is expected to provide a theoretical basis for the anticancer application of theaflavins in the future.
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Affiliation(s)
- Ting Luo
- College of Food and Bioengineering, South China University of Technology, Guangzhou 510640, China
| | - Jian-Guo Jiang
- College of Food and Bioengineering, South China University of Technology, Guangzhou 510640, China
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8
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Shan Z, Nisar MF, Li M, Zhang C, Wan C(C. Theaflavin Chemistry and Its Health Benefits. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2021; 2021:6256618. [PMID: 34804369 PMCID: PMC8601833 DOI: 10.1155/2021/6256618] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Revised: 10/30/2021] [Accepted: 11/02/2021] [Indexed: 02/07/2023]
Abstract
Huge epidemiological and clinical studies have confirmed that black tea is a rich source of health-promoting ingredients, such as catechins and theaflavins (TFs). Furthermore, TF derivatives mainly include theaflavin (TF1), theaflavin-3-gallate (TF2A), theaflavin-3'-gallate (TF2B), and theaflavin-3,3'-digallate (TF3). All of these TFs exhibit extensive usages in pharmaceutics, foods, and traditional medication systems. Various indepth studies reported that how TFs modulates health effects in cellular and molecular mechanisms. The available literature regarding the pharmacological activities of TFs has revealed that TF3 has remarkable anti-inflammatory, antioxidant, anticancer, antiobesity, antiosteoporotic, and antimicrobial properties, thus posing significant effects on human health. The current manuscript summarizes both the chemistry and various pharmacological effects of TFs on human health, lifestyle or aging associated diseases, and populations of gut microbiota. Furthermore, the biological potential of TFs has also been focused to provide a deeper understanding of its mechanism of action.
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Affiliation(s)
- Zhiguo Shan
- College of Agriculture and Forestry, Pu'er University, Pu'er 665099, China
| | - Muhammad Farrukh Nisar
- Jiangxi Key Laboratory for Postharvest Technology and Nondestructive Testing of Fruits & Vegetables, College of Agronomy, Jiangxi Agricultural University, Nanchang 330045, China
- Department of Physiology and Biochemistry, Cholistan University of Veterinary and Animal Sciences (CUVAS), Bahawalpur 63100, Pakistan
| | - Mingxi Li
- Research Center of Tea and Tea Culture, College of Agronomy, Jiangxi Agricultural University, Nanchang, Jiangxi, China
| | - Chunhua Zhang
- College of Agriculture and Forestry, Pu'er University, Pu'er 665099, China
| | - Chunpeng (Craig) Wan
- Jiangxi Key Laboratory for Postharvest Technology and Nondestructive Testing of Fruits & Vegetables, College of Agronomy, Jiangxi Agricultural University, Nanchang 330045, China
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9
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Qu F, Ai Z, Liu S, Zhang H, Chen Y, Wang Y, Ni D. Study on mechanism of low bioavailability of black tea theaflavins by using Caco-2 cell monolayer. Drug Deliv 2021; 28:1737-1747. [PMID: 34463173 PMCID: PMC8409943 DOI: 10.1080/10717544.2021.1949074] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
Abstract
This study aimed to clarify the bioavailability mechanism of theaflavins by using the Caco-2 monolayer in vitro model. Prior to the transport of theaflavin (TF), theaflavin-3-gallate (TF3G), theaflavin-3'-gallate (TF3'G), and theaflavin-3, 3'-digallate (TFDG), we found the cytotoxicity of theaflavins was in the order of TF3'G > TFDG > TF3G > TF, suggesting the galloyl moiety enhances the cytotoxicity of theaflavins. Meantime, the galloyl moiety made theaflavins unstable, with the stability in the order of TF > TFDG > TF3G/TF3'G. Four theaflavins showed poor bioavailability with the Papp values ranging from 0.44 × 10-7 to 3.64 × 10-7 cm/s in the absorptive transport. All the theaflavins showed an efflux ratio of over 1.24. And it is further confirmed that P-glycoprotein (P-gp), multidrug resistance associated proteins (MRPs) and breast cancer resistance protein (BCRP) were all shown to contribute to the efflux transport of four theaflavins, with P-gp playing the most important role, followed by MRPs and BCRP. Moreover, theaflavins increased the expression of P-gp, MRP1, MPR3, and BCRP while decreased the expression of MRP2 at the transcription and translation levels. Additionally, the gallated theaflavins were degraded into simple theaflavins and gallic acids when transported through Caco-2 monolayers. Overall, the structural instability, efflux transporters, and cell metabolism were all responsible for the low bioavailability of four theaflavins in Caco-2 monolayers.
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Affiliation(s)
- Fengfeng Qu
- Key Laboratory of Horticultural Plant Biology, College of Horticulture and Forestry Sciences, Ministry of Education, Huazhong Agricultural University, Wuhan, China.,College of Horticulture, Qingdao Agricultural University, Qingdao, China
| | - Zeyi Ai
- Key Laboratory of Horticultural Plant Biology, College of Horticulture and Forestry Sciences, Ministry of Education, Huazhong Agricultural University, Wuhan, China
| | - Shuyuan Liu
- Key Laboratory of Horticultural Plant Biology, College of Horticulture and Forestry Sciences, Ministry of Education, Huazhong Agricultural University, Wuhan, China
| | - Haojie Zhang
- Key Laboratory of Horticultural Plant Biology, College of Horticulture and Forestry Sciences, Ministry of Education, Huazhong Agricultural University, Wuhan, China
| | - Yuqiong Chen
- Key Laboratory of Horticultural Plant Biology, College of Horticulture and Forestry Sciences, Ministry of Education, Huazhong Agricultural University, Wuhan, China
| | - Yaomin Wang
- Key Laboratory of Horticultural Plant Biology, College of Horticulture and Forestry Sciences, Ministry of Education, Huazhong Agricultural University, Wuhan, China
| | - Dejiang Ni
- Key Laboratory of Horticultural Plant Biology, College of Horticulture and Forestry Sciences, Ministry of Education, Huazhong Agricultural University, Wuhan, China
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10
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Nargeh H, Aliabadi F, Ajami M, Pazoki-Toroudi H. Role of Polyphenols on Gut Microbiota and the Ubiquitin-Proteasome System in Neurodegenerative Diseases. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2021; 69:6119-6144. [PMID: 34038102 DOI: 10.1021/acs.jafc.1c00923] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Today, neurodegenerative diseases have become a remarkable public health challenge due to their direct relation with aging. Accordingly, understanding the molecular and cellular mechanisms occurring in the pathogenesis of them is essential. Both protein aggregations as a result of the ubiquitin-proteasome system (UPS) inefficiency and gut microbiota alternation are the main pathogenic hallmarks. Polyphenols upregulating this system may decrease the developing rate of neurodegenerative diseases. Most of the dietary intake of polyphenols is converted into other microbial metabolites, which have completely different biological properties from the original polyphenols and should be thoroughly investigated. Herein, several prevalent neurodegenerative diseases are pinpointed to explain the role of gut microbiota alternations and the role of molecular changes, especially UPS down-regulation in their pathogenesis. Some of the most important polyphenols found in our diet are explained along with their microbial metabolites in the body.
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Affiliation(s)
- Hanieh Nargeh
- Department of Life Science Engineering, Faculty of New Sciences and Technologies, University of Tehran, Tehran 1417466191, Iran
| | - Fatemeh Aliabadi
- Physiology Research Center, Faculty of Medicine, Iran University of Medical Sciences, Tehran 14535, Iran
| | - Marjan Ajami
- Faculty of Nutrition Sciences & Food Technology, Shahid Beheshti University of Medical Sciences, 7th Floor, Bldg No. 2 SBUMS, Arabi Avenue, Daneshjoo Boulevard, Velenjak, Tehran 19839-63113, Iran
| | - Hamidreza Pazoki-Toroudi
- Physiology Research Center, Faculty of Medicine, Iran University of Medical Sciences, Tehran 14535, Iran
- Department of Physiology and Physiology Research Center, Faculty of Medicine, Iran University of Medical Sciences, Tehran 14535, Iran
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11
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Shi W, Zhang G, Ma Z, Li L, Liu M, Qin L, Yu Z, Zhao L, Liu Y, Zhang X, Qin J, Ye H, Jiang X, Zhou H, Sun H, Jiao Z. Hyperactivation of HER2-SHCBP1-PLK1 axis promotes tumor cell mitosis and impairs trastuzumab sensitivity to gastric cancer. Nat Commun 2021; 12:2812. [PMID: 33990570 PMCID: PMC8121856 DOI: 10.1038/s41467-021-23053-8] [Citation(s) in RCA: 34] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2020] [Accepted: 04/13/2021] [Indexed: 02/04/2023] Open
Abstract
Trastuzumab is the backbone of HER2-directed gastric cancer therapy, but poor patient response due to insufficient cell sensitivity and drug resistance remains a clinical challenge. Here, we report that HER2 is involved in cell mitotic promotion for tumorigenesis by hyperactivating a crucial HER2-SHCBP1-PLK1 axis that drives trastuzumab sensitivity and is targeted therapeutically. SHCBP1 is an Shc1-binding protein but is detached from scaffold protein Shc1 following HER2 activation. Released SHCBP1 responds to HER2 cascade by translocating into the nucleus following Ser273 phosphorylation, and then contributing to cell mitosis regulation through binding with PLK1 to promote the phosphorylation of the mitotic interactor MISP. Meanwhile, Shc1 is recruited to HER2 for MAPK or PI3K pathways activation. Also, clinical evidence shows that increased SHCBP1 prognosticates a poor response of patients to trastuzumab therapy. Theaflavine-3, 3'-digallate (TFBG) is identified as an inhibitor of the SHCBP1-PLK1 interaction, which is a potential trastuzumab sensitizing agent and, in combination with trastuzumab, is highly efficacious in suppressing HER2-positive gastric cancer growth. These findings suggest an aberrant mitotic HER2-SHCBP1-PLK1 axis underlies trastuzumab sensitivity and offer a new strategy to combat gastric cancer.
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Affiliation(s)
- Wengui Shi
- Cuiying Biomedical Research Center, Lanzhou University Second Hospital, Lanzhou, People's Republic of China
- Biobank of Tumors from Plateau of Gansu Province, Lanzhou University Second Hospital, Lanzhou, People's Republic of China
| | - Gengyuan Zhang
- The Department of General Surgery, Lanzhou University Second Hospital, Lanzhou, People's Republic of China
| | - Zhijian Ma
- The Second Clinical Medical College, Lanzhou University, Lanzhou, People's Republic of China
| | - Lianshun Li
- The Second Clinical Medical College, Lanzhou University, Lanzhou, People's Republic of China
| | - Miaomiao Liu
- The Second Clinical Medical College, Lanzhou University, Lanzhou, People's Republic of China
| | - Long Qin
- Cuiying Biomedical Research Center, Lanzhou University Second Hospital, Lanzhou, People's Republic of China
- Biobank of Tumors from Plateau of Gansu Province, Lanzhou University Second Hospital, Lanzhou, People's Republic of China
| | - Zeyuan Yu
- The Department of General Surgery, Lanzhou University Second Hospital, Lanzhou, People's Republic of China
| | - Lei Zhao
- Cuiying Biomedical Research Center, Lanzhou University Second Hospital, Lanzhou, People's Republic of China
- Biobank of Tumors from Plateau of Gansu Province, Lanzhou University Second Hospital, Lanzhou, People's Republic of China
| | - Yang Liu
- Cuiying Biomedical Research Center, Lanzhou University Second Hospital, Lanzhou, People's Republic of China
- Biobank of Tumors from Plateau of Gansu Province, Lanzhou University Second Hospital, Lanzhou, People's Republic of China
| | - Xue Zhang
- The Second Clinical Medical College, Lanzhou University, Lanzhou, People's Republic of China
| | - Junjie Qin
- Cuiying Biomedical Research Center, Lanzhou University Second Hospital, Lanzhou, People's Republic of China
- Biobank of Tumors from Plateau of Gansu Province, Lanzhou University Second Hospital, Lanzhou, People's Republic of China
| | - Huili Ye
- Cuiying Biomedical Research Center, Lanzhou University Second Hospital, Lanzhou, People's Republic of China
- Biobank of Tumors from Plateau of Gansu Province, Lanzhou University Second Hospital, Lanzhou, People's Republic of China
| | - Xiangyan Jiang
- The Second Clinical Medical College, Lanzhou University, Lanzhou, People's Republic of China
| | - Huinian Zhou
- The Department of General Surgery, Lanzhou University Second Hospital, Lanzhou, People's Republic of China
| | - Hui Sun
- Cuiying Biomedical Research Center, Lanzhou University Second Hospital, Lanzhou, People's Republic of China.
- Biobank of Tumors from Plateau of Gansu Province, Lanzhou University Second Hospital, Lanzhou, People's Republic of China.
| | - Zuoyi Jiao
- Cuiying Biomedical Research Center, Lanzhou University Second Hospital, Lanzhou, People's Republic of China.
- Biobank of Tumors from Plateau of Gansu Province, Lanzhou University Second Hospital, Lanzhou, People's Republic of China.
- The Department of General Surgery, Lanzhou University Second Hospital, Lanzhou, People's Republic of China.
- The Second Clinical Medical College, Lanzhou University, Lanzhou, People's Republic of China.
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12
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Liu Z, de Bruijn WJ, Sanders MG, Wang S, Bruins ME, Vincken JP. Insights in the Recalcitrance of Theasinensin A to Human Gut Microbial Degradation. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2021; 69:2477-2484. [PMID: 33619960 PMCID: PMC8028050 DOI: 10.1021/acs.jafc.1c00727] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/03/2021] [Revised: 02/10/2021] [Accepted: 02/16/2021] [Indexed: 06/12/2023]
Abstract
Due to low bioavailability of dietary phenolic compounds in small intestine, their metabolism by gut microbiota is gaining increasing attention. The microbial metabolism of theasinensin A (TSA), a bioactive catechin dimer found in black tea, has not been studied yet. Here, TSA was extracted and purified for in vitro fermentation by human fecal microbiota, and epigallocatechin gallate (EGCG) and procyanidin B2 (PCB2) were used for comparison. Despite the similarity in their flavan-3-ol skeletons, metabolic fate of TSA was distinctively different. After degalloylation, its core biphenyl-2,2',3,3',4,4'-hexaol structure remained intact during fermentation. Conversely, EGCG and PCB2 were promptly degraded into a series of hydroxylated phenylcarboxylic acids. Computational analyses comparing TSA and PCB2 revealed that TSA's stronger interflavanic bond and more compact stereo-configuration might underlie its lower fermentability. These insights in the recalcitrance of theasinensins to degradation by human gut microbiota are of key importance for a comprehensive understanding of its health benefits.
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Affiliation(s)
- Zhibin Liu
- Laboratory
of Food Chemistry, Wageningen University, P.O. Box 17, Wageningen 6700 AA , The Netherlands
- Institute
of Food Science & Technology, Fuzhou
University, Fuzhou 350108, P.R. China
| | - Wouter J.C. de Bruijn
- Laboratory
of Food Chemistry, Wageningen University, P.O. Box 17, Wageningen 6700 AA , The Netherlands
| | - Mark G. Sanders
- Laboratory
of Food Chemistry, Wageningen University, P.O. Box 17, Wageningen 6700 AA , The Netherlands
| | - Sisi Wang
- Laboratory
of Food Chemistry, Wageningen University, P.O. Box 17, Wageningen 6700 AA , The Netherlands
| | - Marieke E. Bruins
- Food
& Biobased Research, Wageningen University
& Research, P.O. Box 17, Wageningen 6700 AA, The
Netherlands
| | - Jean-Paul Vincken
- Laboratory
of Food Chemistry, Wageningen University, P.O. Box 17, Wageningen 6700 AA , The Netherlands
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13
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Zhang S, Ohland C, Jobin C, Sang S. Black Tea Theaflavin Detoxifies Metabolic Toxins in the Intestinal Tract of Mice. Mol Nutr Food Res 2021; 65:e2000887. [PMID: 33381889 PMCID: PMC7967262 DOI: 10.1002/mnfr.202000887] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2020] [Revised: 12/06/2020] [Indexed: 01/21/2023]
Abstract
SCOPE This study is to determine the in vivo efficacy of black tea theaflavin (TF) to detoxify two metabolic toxins, ammonia and methylglyoxal (MGO), in mice METHODS AND RESULTS: Under in vitro conditions, TF is able to react with ammonia, MGO, and hydrogen peroxide to produce its aminated, MGO conjugated, and oxidized products, respectively. In TF-treated mice, the aminated TF, the MGO conjugates of TF and aminated TF, and the oxidized TF are searched using LC-MS/MS. The results provide the first in vivo evidence that the unabsorbed TF is able to trap ammonia to form the aminated TF; furthermore, both TF and the aminated TF have the capacity to trap MGO to generate the corresponding mono-MGO conjugates. Moreover, TF is oxidized to dehydrotheaflavin, which underwent further amination in the gut. By exposing TF to germ-free (GF) mice and conventionalized mice (GF mice colonized with specific-pathogen-free microbiota), the gut microbiota is demonstrated to facilitate the amination and MGO conjugation of TF. CONCLUSION TF has the capacity to remove the endogenous metabolic toxins through oxidation, amination, and MGO conjugation in the intestinal tract, which can potentially explain why TF still generates in vivo efficacy while showing a poor systematic bioavailability.
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Affiliation(s)
- Shuwei Zhang
- Laboratory for Functional Foods and Human Health, Center for Excellence in Post-Harvest Technologies, North Carolina Agricultural and Technical State University, North Carolina Research Campus, 500 Laureate Way, Kannapolis, North Carolina, 28081, USA
| | - Christina Ohland
- Department of Infectious Diseases and Immunology, University of Florida, Gainesville, Florida, 32611, USA
| | - Christian Jobin
- Department of Infectious Diseases and Immunology, University of Florida, Gainesville, Florida, 32611, USA
| | - Shengmin Sang
- Laboratory for Functional Foods and Human Health, Center for Excellence in Post-Harvest Technologies, North Carolina Agricultural and Technical State University, North Carolina Research Campus, 500 Laureate Way, Kannapolis, North Carolina, 28081, USA
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Liu Z, de Bruijn WJC, Bruins ME, Vincken JP. Microbial Metabolism of Theaflavin-3,3'-digallate and Its Gut Microbiota Composition Modulatory Effects. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2021; 69:232-245. [PMID: 33347309 PMCID: PMC7809692 DOI: 10.1021/acs.jafc.0c06622] [Citation(s) in RCA: 34] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Theaflavin-3,3'-digallate (TFDG), a bioactive black tea phenolic, is poorly absorbed in the small intestine, and it has been suggested that gut microbiota metabolism plays a crucial role in its bioactivities. However, information on its metabolic fate and impact on gut microbiota is limited. Here, TFDG was anaerobically fermented in vitro by human fecal microbiota, and epigallocatechin gallate (EGCG) was used for comparison. Despite the similar flavan-3-ol skeletons, TFDG was more slowly degraded and yielded a distinctively different metabolic profile. The formation of theanaphthoquinone as the main metabolites was unique to TFDG. Additionally, a number of hydroxylated phenylcarboxylic acids were formed with low concentrations, when comparing to EGCG metabolism. Microbiome profiling demonstrated several similarities in gut microbiota modulatory effects, including growth-promoting effects on Bacteroides, Faecalibacterium, Parabacteroides, and Bifidobacterium, and inhibitory effects on Prevotella and Fusobacterium. In conclusion, TFDG and EGCG underwent significantly different microbial metabolic fates, yet their gut microbiota modulatory effects were similar.
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Affiliation(s)
- Zhibin Liu
- Laboratory
of Food Chemistry, Wageningen University, P.O. Box 17, 6700 AA Wageningen, The Netherlands
- Institute
of Food Science & Technology, Fuzhou
University, Fuzhou 350108, P.R. China
| | - Wouter J. C. de Bruijn
- Laboratory
of Food Chemistry, Wageningen University, P.O. Box 17, 6700 AA Wageningen, The Netherlands
| | - Marieke E. Bruins
- Food
& Biobased Research, Wageningen University
& Research, P.O. Box 17, 6700 AA Wageningen, The Netherlands
| | - Jean-Paul Vincken
- Laboratory
of Food Chemistry, Wageningen University, P.O. Box 17, 6700 AA Wageningen, The Netherlands
- . Tel.: +31-317482234
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15
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Wang W, Zhang S, Lv L, Sang S. A new method to prepare and redefine black tea thearubigins. J Chromatogr A 2018; 1563:82-88. [PMID: 29859681 PMCID: PMC6008242 DOI: 10.1016/j.chroma.2018.05.060] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2017] [Revised: 04/05/2018] [Accepted: 05/27/2018] [Indexed: 12/21/2022]
Abstract
Thearubigins (TRs) are the major components of black tea, which are formed during the fermentation reactions. Although anti-inflammatory and anti-cancer activities of TRs have been reported, the prepared TRs according to the literature methods still contain many floating peaks. It is puzzling whether the observed activities are from TRs or these floating peaks. Thus, it is urgent to develop a method to prepare pure TRs and redefine them. In the present study, we developed a new method, the combination of caffeine precipitation and Sephadex LH-20 column chromatography, to prepare pure TRs. The floating peaks on the hump of the crude TRs were removed, and pure TRs were prepared. The chemical profile of the floating peaks was established using LC/MS, and the major compounds in this fraction were identified as apigenin glycosides, quercetin glycosides, kaempferol glycosides, theaflavins, theasinensin, and galloylglucoses based on the analysis of their tandem mass spectra and in comparison with literature data. This study will pave the way to further study the chemistry and biological activities of TRs and the health effects of black tea consumption.
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Affiliation(s)
- Weixin Wang
- Laboratory for Functional Foods and Human Health, Center for Excellence in Post-Harvest Technologies, North Carolina Agricultural and Technical State University, North Carolina Research Campus, 500 Laureate Way, Kannapolis, NC 28081, United States
| | - Shuwei Zhang
- Laboratory for Functional Foods and Human Health, Center for Excellence in Post-Harvest Technologies, North Carolina Agricultural and Technical State University, North Carolina Research Campus, 500 Laureate Way, Kannapolis, NC 28081, United States
| | - Lishuang Lv
- Department of Food Science and Technology, Nanjing Normal University, 122# Ninghai Road, Nanjing, 210097, PR China
| | - Shengmin Sang
- Laboratory for Functional Foods and Human Health, Center for Excellence in Post-Harvest Technologies, North Carolina Agricultural and Technical State University, North Carolina Research Campus, 500 Laureate Way, Kannapolis, NC 28081, United States.
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16
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Pasinetti GM, Singh R, Westfall S, Herman F, Faith J, Ho L. The Role of the Gut Microbiota in the Metabolism of Polyphenols as Characterized by Gnotobiotic Mice. J Alzheimers Dis 2018; 63:409-421. [PMID: 29660942 PMCID: PMC6021178 DOI: 10.3233/jad-171151] [Citation(s) in RCA: 52] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
A growing body of experimental data suggests that microbes in the gut influence behavior and can alter brain physiology and neurochemistry. Although promising, researchers are only starting to understand the potential of the gut microbiota for use in neurological disease. Recent evidence demonstrated that gastrointestinal activities are linked to mood disorders such as anxiety, depression, and most recently, cognitive functions in age-related neurodegenerative disorders. Studies from our group and others are uncovering new evidence suggesting that the gut microbiota plays a crucial role in the metabolism and bioavailability of certain dietary compounds and synthetic drugs. Based on this evidence, this review article will discuss the implications of the gut microbiota in mechanisms of bioavailability and biotransformation with an emphasis on dietary polyphenol compounds. This will be followed by a survey of ongoing innovative research identifying the ability of individual gut bacteria to enhance the bioavailability of gut-derived, brain-penetrating, bioactive polyphenol metabolites that ultimately influence mechanisms associated with the promotion of resilience against psychological and cognitive impairment in response to stress. Lastly, current research initiatives aimed at promoting the generation of brain bioactive polyphenol metabolites by specialized gut microbes will be discussed, specifically the use of gnotobiotic mice to develop bioengineered second generation probiotics. We propose that leveraging the gut microbial ecosystem to generate brain targeted bioactive metabolites from dietary polyphenols can attenuate lifestyle risk factors and promote resilience against age-related cognitive decline.
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Affiliation(s)
- Giulio Maria Pasinetti
- Department of Neurology, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Geriatric Research, Education and Clinical Center, James J. Peters Veterans Affairs Medical Center, Bronx, NY, USA
| | - Risham Singh
- Department of Neurology, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Susan Westfall
- Department of Biomedical Engineering, McGill University, Montreal, QC, Canada
| | - Francis Herman
- Department of Neurology, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Jeremiah Faith
- Department of Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Lap Ho
- Department of Neurology, Icahn School of Medicine at Mount Sinai, New York, NY, USA
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17
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Pereira-Caro G, Moreno-Rojas JM, Brindani N, Del Rio D, Lean MEJ, Hara Y, Crozier A. Bioavailability of Black Tea Theaflavins: Absorption, Metabolism, and Colonic Catabolism. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2017; 65:5365-5374. [PMID: 28595385 DOI: 10.1021/acs.jafc.7b01707] [Citation(s) in RCA: 80] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Data obtained with in vitro fecal incubations and a feeding study indicate black tea theaflavin and its galloyl derivatives are not absorbed in detectable amounts in either the upper or lower gastrointestinal tract. The theaflavin skeleton is comparatively resistant to degradation by colonic bacteria with a 67% recovery being obtained after a 24 h incubation, which yielded 21 phenolic and aromatic catabolites. The theaflavin galloyl moiety was removed by the microbiota, and the released gallic acid further transformed to 3-O- and 4-O-methyl gallic acids, pyrogallol-1-sulfate and pyrogallol-2-sulfate, which were excreted in urine in amounts equivalent to 94% of intake. The main urinary product potentially derived from breakdown of the theaflavin skeleton was 3-(4'-hydroxyphenyl)propionic acid. A number of the colonic catabolites originating from gallic acid and theaflavins has been reported to be bioactive in ex vivo and in vitro models with a variety of potential modes of action.
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Affiliation(s)
- Gema Pereira-Caro
- Department of Food and Health, Andalusian Institute of Agricultural and Fisheries Research and Training (IFAPA) , Avenida Menendez-Pidal, SN 14004, Córdoba, Spain
| | - José Manuel Moreno-Rojas
- Department of Food and Health, Andalusian Institute of Agricultural and Fisheries Research and Training (IFAPA) , Avenida Menendez-Pidal, SN 14004, Córdoba, Spain
| | | | - Daniele Del Rio
- Department of Food and Drug, University of Parma , 43124 Parma, Italy
| | - Michael E J Lean
- College of Medical, Veterinary and Life Sciences, University of Glasgow , New Lister Building, Glasgow G31 2ER, U.K
| | | | - Alan Crozier
- Department of Nutrition, University of California , Davis, California 95616-5270, United States
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18
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Xia G, Lin C, Liu S. Tannase-mediated biotransformation assisted separation and purification of theaflavin and epigallocatechin by high speed counter current chromatography and preparative high performance liquid chromatography: A comparative study. Microsc Res Tech 2016; 79:880-9. [PMID: 27389804 DOI: 10.1002/jemt.22715] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2016] [Revised: 05/23/2016] [Accepted: 06/15/2016] [Indexed: 01/12/2023]
Abstract
A large scale isolation and purification of theaflavin (TF) and epigallocatechin (EGC) has been successfully developed by tannase-mediated biotransformation combining high-speed countercurrent chromatography. After tannase hydrolysis of a commercially available theaflavins extract (TE), the content of TF and EGC in tannase-mediated biotransformation product (TBP) achieved approximately 3 times enrichment. SEM studies revealed smooth tannase biotransformation and the possibility of recovery of the tannase. A single 1.5 hours' HSCCC separation for TF and EGC employing a two-phase solvent system could simultaneously produce 180.8 mg of 97.3% purity TF and 87.5 mg of 97.3% purity EGC. However, a preparative HPLC separation of maximum injection volume containing 120 mg TBP prepared 11.2 mg TF of 94.9% purity and 7.7 mg EGC of 89.9% purity. HSCCC separation demonstrated significant advantages over Prep HPLC in terms of sample loading size, separation time, environmental friendly solvent systems, and the production.
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Affiliation(s)
- Guobin Xia
- Department of Food Science and Nutrition, Fuli Institute of Food Science, Zhejiang Key Laboratory for Agro-Food Processing, Zhejiang R & D Center for Food Technology and Equipment, Zhejiang University, 866 Yuhangtang Road, Hangzhou, 310058, China
| | - Chunfang Lin
- Department of Food Science and Nutrition, Fuli Institute of Food Science, Zhejiang Key Laboratory for Agro-Food Processing, Zhejiang R & D Center for Food Technology and Equipment, Zhejiang University, 866 Yuhangtang Road, Hangzhou, 310058, China
| | - Songbai Liu
- Department of Food Science and Nutrition, Fuli Institute of Food Science, Zhejiang Key Laboratory for Agro-Food Processing, Zhejiang R & D Center for Food Technology and Equipment, Zhejiang University, 866 Yuhangtang Road, Hangzhou, 310058, China
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19
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Protective effect of black tea extract against aluminium chloride-induced Alzheimer's disease in rats: A behavioural, biochemical and molecular approach. J Funct Foods 2015. [DOI: 10.1016/j.jff.2015.05.001] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
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20
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Jiang X, Liu Y, Li W, Zhao L, Meng F, Wang Y, Tan H, Yang H, Wei C, Wan X, Gao L, Xia T. Tissue-specific, development-dependent phenolic compounds accumulation profile and gene expression pattern in tea plant [Camellia sinensis]. PLoS One 2013; 8:e62315. [PMID: 23646127 PMCID: PMC3639974 DOI: 10.1371/journal.pone.0062315] [Citation(s) in RCA: 137] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2012] [Accepted: 03/20/2013] [Indexed: 12/03/2022] Open
Abstract
Phenolic compounds in tea plant [Camellia sinensis (L.)] play a crucial role in dominating tea flavor and possess a number of key pharmacological benefits on human health. The present research aimed to study the profile of tissue-specific, development-dependent accumulation pattern of phenolic compounds in tea plant. A total of 50 phenolic compounds were identified qualitatively using liquid chromatography in tandem mass spectrometry technology. Of which 29 phenolic compounds were quantified based on their fragmentation behaviors. Most of the phenolic compounds were higher in the younger leaves than that in the stem and root, whereas the total amount of proanthocyanidins were unexpectedly higher in the root. The expression patterns of 63 structural and regulator genes involved in the shikimic acid, phenylpropanoid, and flavonoid pathways were analyzed by quantitative real-time polymerase chain reaction and cluster analysis. Based on the similarity of their expression patterns, the genes were classified into two main groups: C1 and C2; and the genes in group C1 had high relative expression level in the root or low in the bud and leaves. The expression patterns of genes in C2-2-1 and C2-2-2-1 groups were probably responsible for the development-dependent accumulation of phenolic compounds in the leaves. Enzymatic analysis suggested that the accumulation of catechins was influenced simultaneously by catabolism and anabolism. Further research is recommended to know the expression patterns of various genes and the reason for the variation in contents of different compounds in different growth stages and also in different organs.
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Affiliation(s)
- Xiaolan Jiang
- Key Laboratory of Tea Biochemistry and Biotechnology, Ministry of Education in China, Anhui Agricultural University, Hefei, Anhui, China
| | - Yajun Liu
- School of Life Science, Anhui Agricultural University, Hefei, Anhui, China
| | - Weiwei Li
- School of Life Science, Anhui Agricultural University, Hefei, Anhui, China
| | - Lei Zhao
- Key Laboratory of Tea Biochemistry and Biotechnology, Ministry of Education in China, Anhui Agricultural University, Hefei, Anhui, China
| | - Fei Meng
- Key Laboratory of Tea Biochemistry and Biotechnology, Ministry of Education in China, Anhui Agricultural University, Hefei, Anhui, China
| | - Yunsheng Wang
- School of Life Science, Anhui Agricultural University, Hefei, Anhui, China
| | - Huarong Tan
- Biotechnology Center, Anhui Agricultural University, Hefei, Anhui, China
| | - Hua Yang
- Key Laboratory of Tea Biochemistry and Biotechnology, Ministry of Education in China, Anhui Agricultural University, Hefei, Anhui, China
| | - Chaoling Wei
- Key Laboratory of Tea Biochemistry and Biotechnology, Ministry of Education in China, Anhui Agricultural University, Hefei, Anhui, China
| | - Xiaochun Wan
- Key Laboratory of Tea Biochemistry and Biotechnology, Ministry of Education in China, Anhui Agricultural University, Hefei, Anhui, China
| | - Liping Gao
- School of Life Science, Anhui Agricultural University, Hefei, Anhui, China
- * E-mail: (TX); (LG)
| | - Tao Xia
- Key Laboratory of Tea Biochemistry and Biotechnology, Ministry of Education in China, Anhui Agricultural University, Hefei, Anhui, China
- * E-mail: (TX); (LG)
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Henning SM, Wang P, Abgaryan N, Vicinanza R, de Oliveira DM, Zhang Y, Lee RP, Carpenter CL, Aronson WJ, Heber D. Phenolic acid concentrations in plasma and urine from men consuming green or black tea and potential chemopreventive properties for colon cancer. Mol Nutr Food Res 2013; 57:483-93. [PMID: 23319439 DOI: 10.1002/mnfr.201200646] [Citation(s) in RCA: 83] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2012] [Revised: 11/08/2012] [Accepted: 11/21/2012] [Indexed: 12/16/2022]
Abstract
SCOPE Tea polyphenols are metabolized by the colonic microflora yielding phenolic metabolites, which may contribute to the health benefits of tea. We determined the serum and urine concentrations of phenolic acids, hippuric acid, and polyhydroxyphenyl-γ-valerolactones during green tea (GT) and black tea (BT) administration. The effects of (-)-epigallocatechin gallate (EGCG) and 3,4-dihydroxyphenylacetic acid (3,4-DHPAA) alone and in combination on bioavailability, intracellular metabolism, and antiproliferative activity were determined in HCT-116 colon cancer cells. METHODS AND RESULTS The concentration of phenolic metabolites was quantified by HPLC with electrochemical detection and MS. Urine concentrations of 4-hydroxyphenylacetic acid (4-HPAA), 3-hydroxyphenylacetic acid (3-HPAA), and polyhydroxy-γ-valerolactones were increased significantly in men drinking GT compared to control. Urine concentration of 3-O-methylgallic acid (3OMGA) was significantly increased in men drinking BT compared to control. Serum 3,4-DHPAA was significantly increased after consumption of GT and BT and 4-HPAA after GT consumption. In vitro treatment of HCT-116 colon cancer cells with 3,4-DHPAA and EGCG exhibited an additive antiproliferative effect, while methylation of 3,4-DHPAA was significantly decreased. 3OMGA exhibited the strongest antiproliferative activity among the phenolic acids. CONCLUSION The consumption of both, GT and BT, was associated with a significant increase in urinary and serum phenolic acids.
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Affiliation(s)
- Susanne M Henning
- Center for Human Nutrition, David Geffen School of Medicine, University of California, Los Angeles, CA 90095, USA.
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The microbiota is essential for the generation of black tea theaflavins-derived metabolites. PLoS One 2012; 7:e51001. [PMID: 23227227 PMCID: PMC3515489 DOI: 10.1371/journal.pone.0051001] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2012] [Accepted: 10/29/2012] [Indexed: 12/22/2022] Open
Abstract
Background Theaflavins including theaflavin (TF), theaflavin-3-gallate (TF3G), theaflavin-3′-gallate (TF3′G), and theaflavin-3,3′-digallate (TFDG), are the most important bioactive polyphenols in black tea. Because of their poor systemic bioavailability, it is still unclear how these compounds can exert their biological functions. The objective of this study is to identify the microbial metabolites of theaflavins in mice and in humans. Methods and Findings In the present study, we gavaged specific pathogen free (SPF) mice and germ free (GF) mice with 200 mg/kg TFDG and identified TF, TF3G, TF3′G, and gallic acid as the major fecal metabolites of TFDG in SPF mice. These metabolites were absent in TFDG- gavaged GF mice. The microbial bioconversion of TFDG, TF3G, and TF3′G was also investigated in vitro using fecal slurries collected from three healthy human subjects. Our results indicate that TFDG is metabolized to TF, TF3G, TF3′G, gallic acid, and pyrogallol by human microbiota. Moreover, both TF3G and TF3′G are metabolized to TF, gallic acid, and pyrogallol by human microbiota. Importantly, we observed interindividual differences on the metabolism rate of gallic acid to pyrogallol among the three human subjects. In addition, we demonstrated that Lactobacillus plantarum 299v and Bacillus subtilis have the capacity to metabolize TFDG. Conclusions The microbiota is important for the metabolism of theaflavins in both mice and humans. The in vivo functional impact of microbiota-generated theaflavins-derived metabolites is worthwhile of further study.
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