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Shin-Ya M, Nakashio M, Ohgitani E, Suganami A, Kawamoto M, Ichitani M, Kobayashi M, Takihara T, Inaba T, Nukui Y, Kinugasa H, Ishikura H, Tamura Y, Mazda O. Effects of tea, catechins and catechin derivatives on Omicron subvariants of SARS-CoV-2. Sci Rep 2023; 13:16577. [PMID: 37789046 PMCID: PMC10547759 DOI: 10.1038/s41598-023-43563-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2023] [Accepted: 09/26/2023] [Indexed: 10/05/2023] Open
Abstract
The Omicron subvariants of SARS-CoV-2 have multiple mutations in the S-proteins and show high transmissibility. We previously reported that tea catechin (-)-epigallocatechin gallate (EGCG) and its derivatives including theaflavin-3,3'-di-O-digallate (TFDG) strongly inactivated the conventional SARS-CoV-2 by binding to the receptor binding domain (RBD) of the S-protein. Here we show that Omicron subvariants were effectively inactivated by green tea, Matcha, and black tea. EGCG and TFDG strongly suppressed infectivity of BA.1 and XE subvariants, while effect on BA.2.75 was weaker. Neutralization assay showed that EGCG and TFDG inhibited interaction between BA.1 RBD and ACE2. In silico analyses suggested that N460K, G446S and F490S mutations in RBDs crucially influenced the binding of EGCG/TFDG to the RBDs. Healthy volunteers consumed a candy containing green tea or black tea, and saliva collected from them immediately after the candy consumption significantly decreased BA.1 virus infectivity in vitro. These results indicate specific amino acid substitutions in RBDs that crucially influence the binding of EGCG/TFDG to the RBDs and different susceptibility of each Omicron subvariant to EGCG/TFDG. The study may suggest molecular basis for potential usefulness of these compounds in suppression of mutant viruses that could emerge in the future and cause next pandemic.
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Affiliation(s)
- Masaharu Shin-Ya
- Department of Immunology, Kyoto Prefectural University of Medicine, Kyoto, Japan
- Department of Molecular Anti-Virus Immunology, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Maiko Nakashio
- Department of Immunology, Kyoto Prefectural University of Medicine, Kyoto, Japan
- Department of Emergency and Critical Care Medicine, Faculty of Medicine, Fukuoka University, Fukuoka, Japan
| | - Eriko Ohgitani
- Department of Immunology, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Akiko Suganami
- Department of Bioinformatics, Graduate School of Medicine, Chiba University, Chiba, Japan
| | - Masaya Kawamoto
- Department of Immunology, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Masaki Ichitani
- Department of Molecular Anti-Virus Immunology, Kyoto Prefectural University of Medicine, Kyoto, Japan
- Central Research Institute, ITO EN, Ltd, Shizuoka, Japan
| | | | | | - Tohru Inaba
- Department of Infection Control and Laboratory Medicine, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Yoko Nukui
- Department of Infection Control and Laboratory Medicine, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | | | - Hiroyasu Ishikura
- Department of Emergency and Critical Care Medicine, Faculty of Medicine, Fukuoka University, Fukuoka, Japan
| | - Yutaka Tamura
- Department of Bioinformatics, Graduate School of Medicine, Chiba University, Chiba, Japan
| | - Osam Mazda
- Department of Immunology, Kyoto Prefectural University of Medicine, Kyoto, Japan.
- Department of Molecular Anti-Virus Immunology, Kyoto Prefectural University of Medicine, Kyoto, Japan.
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Nakashio M, Ohgitani E, Shin-Ya M, Kawamoto M, Ichitani M, Kobayashi M, Takihara T, Kinugasa H, Ishikura H, Mazda O. Milk Casein Inhibits Effect of Black Tea Galloylated Theaflavins to Inactivate SARS-CoV-2 In Vitro. Bioengineering (Basel) 2023; 10:1068. [PMID: 37760169 PMCID: PMC10526027 DOI: 10.3390/bioengineering10091068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2023] [Revised: 09/01/2023] [Accepted: 09/03/2023] [Indexed: 09/29/2023] Open
Abstract
Continuing caution is required against the potential emergence of SARS-CoV-2 novel mutants that could pose the next global health and socioeconomical threats. If virus in saliva can be inactivated by a beverage, such a beverage may be useful because the saliva of infected persons is the major origin of droplets and aerosols that mediate human-to-human viral transmission. We previously reported that SARS-CoV-2 was significantly inactivated by treatment in vitro with tea including green tea and black tea. Catechins and its derived compounds galloylated theaflavins (gTFs) bound to the receptor-binding domain (RBD) of the S-protein and blocked interaction between RBD and ACE2. Black tea is often consumed with sugar, milk, lemon juice, etc., and it remains unclarified whether these ingredients may influence the anti-SARS-CoV-2 effect of black tea. Here, we examined the effect of black tea on Omicron subvariants in the presence of these ingredients. The infectivity of Omicron subvariants was decreased to 1/100 or lower after treatment with black tea for 10 s. One or two teaspoons of milk (4~8 mL) completely blocked the anti-viral effect of a cup of tea (125 mL), whereas an addition of sugar or lemon juice failed to do so. The suppressive effect was dose-dependently exerted by milk casein but not whey proteins. gTFs were coprecipitated with casein after acidification of milk-supplemented black tea, strongly suggesting the binding of gTFs to casein. The present study demonstrates for the first time that an addition of milk cancelled the anti-SARS-CoV-2 effect of black tea due to binding of casein to gTFs.
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Affiliation(s)
- Maiko Nakashio
- Department of Immunology, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan; (M.N.)
- Department of Emergency and Critical Care Medicine, Faculty of Medicine, Fukuoka University, Fukuoka 814-0180, Japan
| | - Eriko Ohgitani
- Department of Immunology, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan; (M.N.)
| | - Masaharu Shin-Ya
- Department of Immunology, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan; (M.N.)
- Department of Molecular Anti-Virus Immunology, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan
| | - Masaya Kawamoto
- Department of Immunology, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan; (M.N.)
| | - Masaki Ichitani
- Department of Molecular Anti-Virus Immunology, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan
- Central Research Institute, ITO EN, Ltd., Shizuoka 421-0516, Japan
| | - Makoto Kobayashi
- Central Research Institute, ITO EN, Ltd., Shizuoka 421-0516, Japan
| | | | - Hitoshi Kinugasa
- Central Research Institute, ITO EN, Ltd., Shizuoka 421-0516, Japan
| | - Hiroyasu Ishikura
- Department of Emergency and Critical Care Medicine, Faculty of Medicine, Fukuoka University, Fukuoka 814-0180, Japan
| | - Osam Mazda
- Department of Immunology, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan; (M.N.)
- Department of Molecular Anti-Virus Immunology, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan
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Goto I, Saga S, Ichitani M, Kimijima M, Narisawa N. Investigation of Components in Roasted Green Tea That Inhibit Streptococcus mutans Biofilm Formation. Foods 2023; 12:2502. [PMID: 37444240 DOI: 10.3390/foods12132502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2023] [Revised: 06/22/2023] [Accepted: 06/22/2023] [Indexed: 07/15/2023] Open
Abstract
Streptococcus mutans form oral biofilms (BFs) and cause dental caries. Roasted green tea (RGT) is prepared by roasting the tea plant, and RGT-specific polyphenols are produced during the roasting process. Catechins, polyphenols in green tea, have BF inhibitory activity against S. mutans; therefore, RGT-specific polyphenols are also expected to have this activity. However, there are few reports on the structural and functional properties of RGT. This study aimed to investigate the inhibitory activity of RGT against S. mutans BF formation and to investigate the active compounds. RGT extract fractionation and BF inhibitory assay were performed. Strong activity was confirmed in the RGT fractions that had medium-high hydrophobicity, were rich in phenolic hydroxyl groups, and lacked catechins. A peak comprising compounds with molecular weights of 918 (mw918) and 1050 (mw1050) was purified from the fraction. Since BF inhibitory activity was confirmed for this peak, these compounds were considered to be part of the active ingredients. The mw918 polyphenol was detected only in RGT and it was thought to be produced during the roasting process. The results of this research will serve as a basis for the future application of RGT as a safe and effective anti-caries agent.
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Affiliation(s)
- Iori Goto
- Central Research Institute, ITO EN, Ltd., 21 Mekami, Makinohara 421-0516, Shizuoka, Japan
| | - Satoshi Saga
- Central Research Institute, ITO EN, Ltd., 21 Mekami, Makinohara 421-0516, Shizuoka, Japan
| | - Masaki Ichitani
- Central Research Institute, ITO EN, Ltd., 21 Mekami, Makinohara 421-0516, Shizuoka, Japan
| | - Manami Kimijima
- Department of Food Science and Technology, College of Bioresource Sciences, Nihon University, 1866 Kameino, Fujisawa 252-0880, Kanagawa, Japan
| | - Naoki Narisawa
- Department of Food Science and Technology, College of Bioresource Sciences, Nihon University, 1866 Kameino, Fujisawa 252-0880, Kanagawa, Japan
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Hosoyama H, Ichitani M. [Fibrinolysis Enhancing Activity of Roasted Barley Extract (Mugicha) and Its Simulated Digestate]. YAKUGAKU ZASSHI 2023; 143:663-672. [PMID: 37532575 DOI: 10.1248/yakushi.23-00004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/04/2023]
Abstract
Barley tea (Mugicha), commonly consumed in Japan and other East Asian countries, is prepared by decocting roasted barley (Hordeum vulgare) seed with hot or cold water. Although barley tea is commonly consumed, studies on its health benefits are limited, especially regarding its bioactivity against thrombosis. During the evaluation of functional foods and drinks, barley tea extract was found to exhibit potential fibrinolysis-enhancing activity induced by urokinase. Therefore, the aim of this study was to explore the application of barley tea as a functional food and conduct a preliminary investigation to reveal the effects of barley tea on thrombosis. Hot water extract of roasted barley was treated with pancreatin and separated via various techniques using macroporous resin and silica gel and tangential flow filtration with an ultra-filtration membrane. The low-molecular-weight fraction of the roasted barley tea extract was found to possess activity. We further purified the extract and found that the activity of each fraction decreased. Thus, the different fractions of the roasted barley extract may not exhibit the activity individually, instead additive or synergistic effects of multiple components may occur. The results suggest the potential use of barley extract as a functional food to prevent thrombosis.
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Unno T, Ichitani M. Epigallocatechin-3-Gallate Decreases Plasma and Urinary Levels of p-Cresol by Modulating Gut Microbiota in Mice. ACS Omega 2022; 7:40034-40041. [PMID: 36385823 PMCID: PMC9648152 DOI: 10.1021/acsomega.2c04731] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Accepted: 10/18/2022] [Indexed: 06/16/2023]
Abstract
p-Cresol (PC), a gut bacterial product of tyrosine catabolism, is recognized as a uremic toxin that has negative biological effects. Lowering the plasma PC level by manipulating the gut bacterial composition represents a promising therapeutic strategy in chronic kidney disease. This study was conducted to reveal whether epigallocatechin-3-gallate (EGCG) decreases plasma PC levels by limiting its bacterial production in a mouse model. The PC concentration in the samples was measured by high-performance liquid chromatography (HPLC) after treatments with sulfatase and β-glucuronidase. The results showed that the addition of EGCG to the diet decreased the plasma and urinary concentrations of PC in a dose-dependent manner, with a statistically significant difference between the control group and the 0.2% EGCG group. However, once EGCG was enzymatically hydrolyzed to epigallocatechin (EGC) and gallic acid, such effects were lost almost completely. The addition of 0.2% EGCG in the diet was accompanied by a decreased abundance of Firmicutes at the phylum level and Clostridiales at the order level, which constitute a large part of PC produced from tyrosine. In conclusion, EGCG, not EGC, reduced plasma and urinary concentrations of PC in mice by suppressing its bacterial production with accompanying alteration of the relative abundance of PC producers.
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Affiliation(s)
- Tomonori Unno
- Faculty
of Human Nutrition, Tokyo Kasei Gakuin University, 22 Sanban-cho,
Chiyoda-ku, Tokyo 102-8341, Japan
| | - Masaki Ichitani
- Central
Research Institute, Ito En, Ltd., 21 Mekami, Makihohara-shi, Shizuoka 421-0516, Japan
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Tanaka KI, Nakaguchi S, Shiota S, Nakada Y, Oyama K, Sakakibara O, Shimoda M, Sugimoto A, Ichitani M, Takihara T, Kinugasa H, Kawahara M. Preventive Effect of Epigallocatechin Gallate, the Main Component of Green Tea, on Acute Lung Injury Caused by Air Pollutants. Biomolecules 2022; 12:biom12091196. [PMID: 36139034 PMCID: PMC9496336 DOI: 10.3390/biom12091196] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2022] [Revised: 08/23/2022] [Accepted: 08/26/2022] [Indexed: 12/04/2022] Open
Abstract
Reducing the health hazards caused by air pollution is a global challenge and is included in the Sustainable Development Goals. Air pollutants, such as PM2.5, induce respiratory and cardiovascular disorders by causing various inflammatory responses via oxidative stress. Catechins and polyphenols, which are components of green tea, have various protective effects, owing to their antioxidant ability. The main catechin in green tea, epigallocatechin gallate (EGCG), is potentially effective against respiratory diseases, such as idiopathic pulmonary fibrosis and asthma, but its effectiveness against air-pollution-dependent lung injury has not yet been investigated. In this study, we examined the effect of EGCG on urban aerosol-induced acute lung injury in mice. Urban aerosol treatment caused increases in inflammatory cell counts, protein levels, and inflammatory cytokine expression in the lungs of ICR mice, but pretreatment with EGCG markedly suppressed these responses. Analyses of oxidative stress revealed that urban aerosol exposure enhanced reactive oxygen species (ROS) production and the formation of ROS-activated neutrophil extracellular traps (NETs) in the lungs of mice. However, ROS production and NETs formation were markedly suppressed by pretreating the mice with EGCG. Gallocatechin gallate (GCG), a heat-epimerized form of EGCG, also markedly suppressed urban aerosol-dependent inflammatory responses and ROS production in vivo and in vitro. These findings suggest that EGCG and GCG prevent acute lung injury caused by urban aerosols through their inhibitory effects on ROS production. Thus, we believe that foods and medications containing EGCG or GCG may be candidates to prevent the onset and progression of acute lung injury caused by air pollutants.
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Affiliation(s)
- Ken-Ichiro Tanaka
- Laboratory of Bio-Analytical Chemistry, Research Institute of Pharmaceutical Sciences, Musashino University, 1-1-20 Shinmachi, Nishitokyo 202-8585, Japan
- Correspondence: ; Tel./Fax: +81-42-468-9335
| | - Shunsuke Nakaguchi
- Laboratory of Bio-Analytical Chemistry, Research Institute of Pharmaceutical Sciences, Musashino University, 1-1-20 Shinmachi, Nishitokyo 202-8585, Japan
| | - Sachie Shiota
- Laboratory of Bio-Analytical Chemistry, Research Institute of Pharmaceutical Sciences, Musashino University, 1-1-20 Shinmachi, Nishitokyo 202-8585, Japan
| | - Yuka Nakada
- Laboratory of Bio-Analytical Chemistry, Research Institute of Pharmaceutical Sciences, Musashino University, 1-1-20 Shinmachi, Nishitokyo 202-8585, Japan
| | - Kaho Oyama
- Laboratory of Bio-Analytical Chemistry, Research Institute of Pharmaceutical Sciences, Musashino University, 1-1-20 Shinmachi, Nishitokyo 202-8585, Japan
| | - Okina Sakakibara
- Laboratory of Bio-Analytical Chemistry, Research Institute of Pharmaceutical Sciences, Musashino University, 1-1-20 Shinmachi, Nishitokyo 202-8585, Japan
| | - Mikako Shimoda
- Laboratory of Bio-Analytical Chemistry, Research Institute of Pharmaceutical Sciences, Musashino University, 1-1-20 Shinmachi, Nishitokyo 202-8585, Japan
| | - Akio Sugimoto
- Central Research Institute, ITO EN, Ltd., 21 Mekami, Makinohara 421-0516, Japan
| | - Masaki Ichitani
- Central Research Institute, ITO EN, Ltd., 21 Mekami, Makinohara 421-0516, Japan
| | - Takanobu Takihara
- Central Research Institute, ITO EN, Ltd., 21 Mekami, Makinohara 421-0516, Japan
| | - Hitoshi Kinugasa
- Central Research Institute, ITO EN, Ltd., 21 Mekami, Makinohara 421-0516, Japan
| | - Masahiro Kawahara
- Laboratory of Bio-Analytical Chemistry, Research Institute of Pharmaceutical Sciences, Musashino University, 1-1-20 Shinmachi, Nishitokyo 202-8585, Japan
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Unno T, Araki Y, Inagaki S, Kobayashi M, Ichitani M, Takihara T, Kinugasa H. Fructooligosaccharides Increase in Plasma Concentration of (-)-Epigallocatechin-3-Gallate in Rats. J Agric Food Chem 2021; 69:14849-14855. [PMID: 34870993 DOI: 10.1021/acs.jafc.1c05991] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
(-)-Epigallocatechin-3-gallate (EGCG) undergoes auto-oxidation at physiological pH and therefore may be poorly absorbed in the intestine. Fructooligosaccharides (FOS), comprising a group of 1-kestose, nystose, and 1F-β fructofuranosyl-nystose, are fermentable by gut bacteria and converted mainly into lactate. This study was conducted to determine whether dietary FOS may help to increase the plasma concentration of EGCG in rats by preventing it from auto-oxidation. Rats consumed an assigned diet, either a 0.3% (w/w) EGCG diet or an EGCG diet with additional 1, 3, or 5% (w/w) FOS, for 2 weeks. The results showed that the plasma concentration of EGCG was 0.21 ± 0.05 μM for the EGCG alone group, and it was significantly higher at 0.65 ± 0.12 μM for the EGCG plus 5% FOS group. Treatments with FOS resulted in a dose-dependent increase in the cecal level of lactate and brought the cecal pH down, with an accompanying alteration in the abundance of Lactobacillus and Collinsella. Because EGCG concentrations in the cecal digesta of rats fed the FOS-containing diet maintained comparatively high levels, FOS likely contributed to the protection of EGCG from auto-oxidation. In conclusion, FOS reduced the pH of the lumen of the intestine, kept EGCG intact to a certain degree, and consequently allowed EGCG to be taken into the blood circulation from the intestine.
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Affiliation(s)
- Tomonori Unno
- Faculty of Human Nutrition, Tokyo Kasei Gakuin University, 22 Sanban-cho, Chiyoda-ku, Tokyo 1028341, Japan
| | - Yoshiharu Araki
- Central Research Institute, ITO EN, Ltd., 21 Mekami, Makinohara-shi, Shizuoka 4210516, Japan
| | - Shun Inagaki
- Central Research Institute, ITO EN, Ltd., 21 Mekami, Makinohara-shi, Shizuoka 4210516, Japan
| | - Makoto Kobayashi
- Central Research Institute, ITO EN, Ltd., 21 Mekami, Makinohara-shi, Shizuoka 4210516, Japan
| | - Masaki Ichitani
- Central Research Institute, ITO EN, Ltd., 21 Mekami, Makinohara-shi, Shizuoka 4210516, Japan
| | - Takanobu Takihara
- Central Research Institute, ITO EN, Ltd., 21 Mekami, Makinohara-shi, Shizuoka 4210516, Japan
| | - Hitoshi Kinugasa
- Central Research Institute, ITO EN, Ltd., 21 Mekami, Makinohara-shi, Shizuoka 4210516, Japan
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Ohgitani E, Shin-Ya M, Ichitani M, Kobayashi M, Takihara T, Kawamoto M, Kinugasa H, Mazda O. Significant Inactivation of SARS-CoV-2 In Vitro by a Green Tea Catechin, a Catechin-Derivative, and Black Tea Galloylated Theaflavins. Molecules 2021; 26:3572. [PMID: 34208050 PMCID: PMC8230566 DOI: 10.3390/molecules26123572] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2021] [Revised: 05/31/2021] [Accepted: 06/10/2021] [Indexed: 12/21/2022] Open
Abstract
Potential effects of tea and its constituents on SARS-CoV-2 infection were assessed in vitro. Infectivity of SARS-CoV-2 was decreased to 1/100 to undetectable levels after a treatment with black tea, green tea, roasted green tea, or oolong tea for 1 min. An addition of (-) epigallocatechin gallate (EGCG) significantly inactivated SARS-CoV-2, while the same concentration of theasinensin A (TSA) and galloylated theaflavins including theaflavin 3,3'-di-O-gallate (TFDG) had more remarkable anti-viral activities. EGCG, TSA, and TFDG at 1 mM, 40 µM, and 60 µM, respectively, which are comparable to the concentrations of these compounds in tea beverages, significantly reduced infectivity of the virus, viral RNA replication in cells, and secondary virus production from the cells. EGCG, TSA, and TFDG significantly inhibited interaction between recombinant ACE2 and RBD of S protein. These results suggest potential usefulness of tea in prevention of person-to-person transmission of the novel coronavirus.
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Affiliation(s)
- Eriko Ohgitani
- Department of Immunology, Kyoto Prefectural University of Medicine, Kamigyo, Kyoto 602-8566, Japan; (E.O.); (M.S.-Y.); (M.K.)
| | - Masaharu Shin-Ya
- Department of Immunology, Kyoto Prefectural University of Medicine, Kamigyo, Kyoto 602-8566, Japan; (E.O.); (M.S.-Y.); (M.K.)
| | - Masaki Ichitani
- Central Research Institute, ITO EN, Ltd., Makinohara, Shizuoka 421-0516, Japan; (M.I.); (M.K.); (T.T.); (H.K.)
| | - Makoto Kobayashi
- Central Research Institute, ITO EN, Ltd., Makinohara, Shizuoka 421-0516, Japan; (M.I.); (M.K.); (T.T.); (H.K.)
| | - Takanobu Takihara
- Central Research Institute, ITO EN, Ltd., Makinohara, Shizuoka 421-0516, Japan; (M.I.); (M.K.); (T.T.); (H.K.)
| | - Masaya Kawamoto
- Department of Immunology, Kyoto Prefectural University of Medicine, Kamigyo, Kyoto 602-8566, Japan; (E.O.); (M.S.-Y.); (M.K.)
| | - Hitoshi Kinugasa
- Central Research Institute, ITO EN, Ltd., Makinohara, Shizuoka 421-0516, Japan; (M.I.); (M.K.); (T.T.); (H.K.)
| | - Osam Mazda
- Department of Immunology, Kyoto Prefectural University of Medicine, Kamigyo, Kyoto 602-8566, Japan; (E.O.); (M.S.-Y.); (M.K.)
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Ichitani M, Okumura H, Nakashima Y, Kinugasa H, Honda M, Kunimoto KK. Spectroscopic characterization of thiol adducts formed in the reaction of 4-methylcatechol with DPPH in the presence of N-acetylcysteine. ACTA ACUST UNITED AC 2018. [DOI: 10.5155/eurjchem.9.4.386-393.1794] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Nucleophiles such as thiol compounds have enhancing effects on the 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activities of polyphenols. Several authors have suggested that regeneration of the catechol structure from o-quinone plays a key role in enhanced radical scavenging activity. We therefore explored the reaction of 4-methyl catechol (MC) with DPPH in the presence of N-acetylcysteine (NACys) to clarify the mechanism underlying activity enhancement. Four types of NACys adducts were isolated and purified by preparative HPLC after the reactions reached equilibrium and their structures were characterized spectroscopically using UV-Vis absorption, NMR, and LC-MS. Oxidation of MC using a periodate resin and subsequent reaction with NACys were also studied. LC-MS analyses revealed that a mono-NACys adduct is produced as the major product in the reaction of MC quinone with NACys, and direct reduction by NACys occurs in reactions with NACys MC quinones.
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Affiliation(s)
- Masaki Ichitani
- Division of Material Sciences, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-Machi, Kanazawa 920-1192, Japan
| | - Hisako Okumura
- Department of Materials Engineering, National Institute of Technology, Nagaoka College, 888 Nishikatakai-Machi, Nagaoka 940-8532, Japan
| | - Yugo Nakashima
- Division of Material Sciences, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-Machi, Kanazawa 920-1192, Japan
| | - Hitoshi Kinugasa
- Central Research Institute, Ito En. Ltd., Shizuoka 421-0516, Japan
| | - Mitsunori Honda
- Division of Material Sciences, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-Machi, Kanazawa 920-1192, Japan
| | - Ko-Ki Kunimoto
- Institute of Liberal Arts and Science, Kanazawa University, Kakuma-Machi, Kanazawa 920-1192, Japan
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Suzuki-Sugihara N, Kishimoto Y, Saita E, Taguchi C, Kobayashi M, Ichitani M, Ukawa Y, Sagesaka YM, Suzuki E, Kondo K. Green tea catechins prevent low-density lipoprotein oxidation via their accumulation in low-density lipoprotein particles in humans. Nutr Res 2016; 36:16-23. [DOI: 10.1016/j.nutres.2015.10.012] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2015] [Revised: 10/29/2015] [Accepted: 10/30/2015] [Indexed: 12/16/2022]
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Sasaki C, Ichitani M, Kunimoto KK, Asada C, Nakamura Y. Extraction of arbutin and its comparative content in branches, leaves, stems, and fruits of Japanese pear Pyrus pyrifolia cv. Kousui. Biosci Biotechnol Biochem 2014; 78:874-7. [PMID: 25035992 DOI: 10.1080/09168451.2014.893185] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Arbutin is a tyrosinase inhibitor and is extensively used as a human skin-whitening agent. This study investigated the optimum conditions for extracting arbutin by ultrasonic homogenization from discarded branches pruned from Japanese pear (Pyrus pyrifolia cv. Kousui) trees. The arbutin content was measured in the branches and also in the leaves, stems, fruit peel, and fruit flesh.
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Affiliation(s)
- Chizuru Sasaki
- a Department of Life System , Institute of Technology and Science, The University of Tokushima , Tokushima , Japan
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12
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Kitoh SI, Feng Y, Fujinami S, Ichitani M, Honda M, Kunimoto KK. 1-Acetyl-5-(4-fluoro-phen-yl)-2-sulfanyl-ideneimidazolidin-4-one. Acta Crystallogr Sect E Struct Rep Online 2013; 69:o1699. [PMID: 24454125 PMCID: PMC3884349 DOI: 10.1107/s1600536813028560] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2013] [Accepted: 10/17/2013] [Indexed: 11/23/2022]
Abstract
In the title compound, C11H9FN2O2S, the 2-sulfanylideneimidazolidin-4-one moiety is essentially planar, with a maximum deviation of 0.0183 (14) Å. The mean plane of this moiety is approximately coplanar with the attached acetyl group and perpendicular to the benzene ring, making dihedral angles of 9.70 (14) and 86.70 (6)°, respectively. In the crystal, molecules are linked by N—H⋯O hydrogen bonds between the amide NH and acetyl C=O groups, forming a C(6) chain along the a-axis direction.
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Affiliation(s)
- Soh-Ichi Kitoh
- Division of Material Sciences, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
| | - Yijing Feng
- Division of Material Sciences, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
| | - Shuhei Fujinami
- Division of Material Sciences, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
| | - Masaki Ichitani
- Division of Material Sciences, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
| | - Mitsunori Honda
- Division of Material Sciences, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
| | - Ko-Ki Kunimoto
- Division of Material Sciences, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
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13
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Ichitani M, Kitoh SI, Fujinami S, Suda M, Honda M, Kunimoto KK. 5-Isopropyl-5-methyl-2-sulfanylidene-imidazolidin-4-one. Acta Crystallogr Sect E Struct Rep Online 2013; 69:o953. [PMID: 23795113 PMCID: PMC3685094 DOI: 10.1107/s1600536813013639] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2013] [Accepted: 05/17/2013] [Indexed: 05/27/2023]
Abstract
In the title compound, C7H12N2OS, the 2-sulfanylideneimidazolidin-4-one moiety is nearly planar, with a maximum deviation of 0.054 (2) Å. In the crystal, a pair of N—H⋯O hydrogen bonds and a pair of N—H⋯S hydrogen bonds each form a centrosymmetric ring with an R22(8) graph-set motif. The enantiomeric R and S molecules are alternately linked into a tape along [1-10] via these pairs of hydrogen bonds.
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Affiliation(s)
- Masaki Ichitani
- Division of Material Sciences, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
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14
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Saha RK, Takahashi T, Kurebayashi Y, Fukushima K, Minami A, Kinbara N, Ichitani M, Sagesaka YM, Suzuki T. Antiviral effect of strictinin on influenza virus replication. Antiviral Res 2010; 88:10-8. [DOI: 10.1016/j.antiviral.2010.06.008] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2010] [Revised: 06/22/2010] [Accepted: 06/22/2010] [Indexed: 11/26/2022]
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16
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Kobayashi M, Ichitani M, Suzuki Y, Unno T, Sugawara T, Yamahira T, Kato M, Takihara T, Sagesaka Y, Kakuda T, Ikeda I. Black-tea polyphenols suppress postprandial hypertriacylglycerolemia by suppressing lymphatic transport of dietary fat in rats. J Agric Food Chem 2009; 57:7131-7136. [PMID: 19722586 DOI: 10.1021/jf900855v] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Administration of black-tea polyphenols (BTP) at 100 and 200 mg/kg of body weight in rats suppressed postprandial hypertriacylglycerolemia in a dose-dependent manner. Administration of BTP also suppressed lymphatic recovery of (14)C-trioleoylglycerol in rats that were cannulated in the thoracic duct. BTP dose-dependently inhibited the activity of pancreatic lipase in vitro with an IC50 of 0.254 mg/mL. When purified theaflavins, which are components of BTP, were used, theaflavins with galloyl moieties, but not those without galloyl moiety, inhibited the activity of pancreatic lipase. Theaflavin-3,3'-digallate (TFDG) was more effective in inhibiting the activity of pancreatic lipase than epigallocatechin gallate (EGCG), epicatechin gallate (ECG), and a mixture of EGCG and ECG. BTP and TFDG had a similar effect in inhibiting the activity of pancreatic lipase when the total polyphenol amount was adjusted to the same. BTP had no effect on micellar solubility of hydrolysis products of triacylglycerol. These results suggest that BTP suppressed postprandial hypertriacylglycerolemia by reducing triacylglycerol absorption via the inhibition of pancreatic lipase activity.
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Affiliation(s)
- Makoto Kobayashi
- Central Research Institute, ITO EN, Ltd., Shizuoka 421-0516, Japan.
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17
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Haginaka J, Tabo H, Ichitani M, Takihara T, Sugimoto A, Sambe H. Uniformly-sized, molecularly imprinted polymers for (−)-epigallocatechin gallate, -epicatechin gallate and -gallocatechin gallate by multi-step swelling and polymerization method. J Chromatogr A 2007; 1156:45-50. [PMID: 17070533 DOI: 10.1016/j.chroma.2006.10.026] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2006] [Revised: 10/10/2006] [Accepted: 10/12/2006] [Indexed: 11/24/2022]
Abstract
Uniformly-sized, molecularly imprinted polymers (MIPs) for (-)-epigallocatechin gallate (EGCg), -epicatechin gallate (ECg) and -gallocatechin gallate (GCg) were prepared by a multi-step swelling and polymerization method using 2-vinylpyridine as a functional monomer, ethylene glycol dimethacrylate as a cross-linker and cyclohexanol as a porogen. Molecular recognition abilities of the obtained MIPs were evaluated in liquid chromatography using a mixture of ethanol and water, or ethanol as the eluent. Each MIP gave the highest molecular recognition ability for the respective template molecule. In addition, (-)-EGCg and -ECg had the same configuration (2R,3R) at positions 2 and 3, and therefore resulting in high cross reactivity each other. However, (-)-GCg, which has different configuration at position 2 with (-)-EGCg and -ECg, showed low cross reactivity with them. On the other hand, those MIPs showed no molecular recognition against (-)-epigallocatechin and -epicatechin, which have no gallate group at position 3. These results indicate that the MIPs prepared can recognize configuration at position 2 and a gallate group at position 3. Furthermore, the MIP for (-)-GCg could be successfully used for isolating (-)-EGCg and -ECg from green tea extract.
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Affiliation(s)
- Jun Haginaka
- Faculty of Pharmaceutical Sciences, Mukogawa Women's University, Nishinomiya, Japan.
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18
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Kunimoto KK, Kitoh SI, Ichitani M, Funaki N, Kuwae A, Hanai K. Crystal and Molecular Structures of Racemic and Chiral 4-Phenyl-1,3-thiazolidine-2-thione. HETEROCYCLES 2002. [DOI: 10.3987/com-02-9556] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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19
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Ikeda Y, Murata M, Araki Y, Watanabe K, Ando Y, Itagaki I, Mori Y, Ichitani M, Sakai K. Importance of fibrinogen and platelet membrane glycoprotein IIb/IIIa in shear-induced platelet aggregation. Thromb Res 1988; 51:157-63. [PMID: 3187957 DOI: 10.1016/0049-3848(88)90059-x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The mechanism of shear-induced platelet aggregation was investigated using a polycarbonate cone and plate viscometer. After exposed to shear stress of 54-90 dyne/cm2 for 2 min. at 37 degrees C, platelets aggregated without a significant amount of serotonin release and lactic dehydrogenase leakage from platelets. Under this conditions, platelets from 2 patients with thrombasthenia and a patient with congenital afibrinogenemia failed to aggregate. When fibrinogen was added to platelet rich plasma from a patient with afibrinogenemia, shear-induced platelet aggregation occurred at the same extent of aggregation as observed in normal platelets. Shear-induced platelet aggregation was inhibited by monoclonal antibody to GPIIb/IIIa (1 microgram/ml) and synthetic peptide, Arg-Gly-Asp-Ser (RGDS) (1 mM). Apyrase and hirudin showed no effect on this aggregation. Indomethacin (100 microM) and thromboxane A2 synthetase inhibitor, OKY-046 (100 microM) markedly inhibited aggregation, while thromboxane A2 competitive inhibitor, ONO-3708 (100 microM) exhibited only partial inhibition. These results indicate that fibrinogen and GPIIb/IIIa are important for shear-induced platelet aggregation and that the induction of fibrinogen receptor on GPIIb/IIIa may partially depend upon thromboxane A2 synthesis in platelets.
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Affiliation(s)
- Y Ikeda
- Department of Haematology, School of Medicine, Keio University, Tokyo, Japan
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20
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Ichitani M, Kohno K, Tuboi H, Oda Y, Otani H. [Concentration in bronchial tissue of LMOX (1 g) after intravenous injection]. Nihon Kyobu Shikkan Gakkai Zasshi 1987; 25:416-20. [PMID: 3669452] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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21
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Tsuboi H, Ichitani M, Kohno K, Sasaki M. [Two cases of tracheobronchopathia osteoplastica]. Nihon Kyobu Shikkan Gakkai Zasshi 1986; 24:1151-4. [PMID: 3102824] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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22
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Tsuboi H, Ichitani M, Kohno K, Kato M, Kureyama M. [Change of rib cage motion before and after lung surgery]. Kokyu To Junkan 1984; 32:45-50. [PMID: 6739967] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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23
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Ichitani M, Kitano M, Kohno K, Iwata T. [Four cases of Morgagni diaphragmatic hernia operated successfully (author's transl)]. Nihon Kyobu Geka Gakkai Zasshi 1977; 25:1087-91. [PMID: 925454] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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24
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Kato M, Ota K, Ichitani M, Kono K. [Evaluation of surgical therapy of lung diseases based on the follow-up results of lung function]. Kyobu Geka 1974; 27:319-26. [PMID: 4471814] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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25
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Ogawa H, Ichitani M. [3 cases of vanishing tumor of the lung]. Bull Chest Dis Res Inst Kyoto Univ 1973; 6:117-21. [PMID: 4730514] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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26
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Azuma M, Umezono C, Ichitani M. [High speed magnified electrocardiography--with special reference to the influence of high cut frequency on p wave]. Bull Chest Dis Res Inst Kyoto Univ 1973; 6:122-5. [PMID: 4730515] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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27
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Ichitani M, Kusama I, Yoshida N, Kurata M, Kai T. [State of post-transfusion hepatitis in the National Utano Sanatorium with special reference to the comparison of blood from paid donors and volunteer donors]. Naika 1968; 21:549-52. [PMID: 5685637] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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