Green Tea Consumption and Chronic Atrophic Gastritis: A Cross-Sectional Study in a Green Tea Production Village.

Shibata, Kumiko; Moriyama, Masaki; Fukushima, Tetsuhito; Kaetsu, Akihiko; Miyazaki, Motonobu; Une, Hiroshi

doi:10.2188/jea.10.310

Cited by 65 publications

(54 citation statements)

References 36 publications

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“…The induced expression of CsCHS in germinal leaves is consistent with the elevation in catechol levels in processed tea, indicating that the use of HpaG Xooc or HpaG 1-94 plays a role in modulating catechol biosynthesis, which is essentially regulated by CsCHS activity (Kato et al 2000;Misako and Kouichi 2004;Punyasiri et al 2004). It can be assumed that either of the proteins applied to growing tea plants could subsequently increase the medicinal properties of green tea through the biochemical effects of the compounds (Shibata et al 2000;Cooper et al 2005;Shimizu and Weinstein 2005). The concomitant decrease in transcripts of TCS1 and CsSAMS suggest that theine synthesis may be downregulated by the application of HpaG Xooc or HpaG 1-94 .…”

Section: Discussionmentioning

confidence: 68%

“…With a long history of origin in China, green tea (Camellia sinensis), a popular variety of tea, has increasingly become a global favourite (Graham 1992). Extracts from green tea contain a full spectrum of amino acids, which enrich human nutrition, and peculiar sets of catechins and fl avonoids Punyasiri et al 2004), which have a potential role to play in the prevention and treatment of cancers and cardiovascular disorders (Shibata et al 2000;Cooper et al 2005;Stangl et al 2006;Friedman et al 2007). The biochemical properties of green tea are important for achieveing its benefi cial effects.…”

Section: Introductionmentioning

confidence: 99%

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Productivity and biochemical properties of green tea in response to full-length and functional fragments of HpaGXooc, a harpin protein from the bacterial rice leaf streak pathogen Xanthomonas oryzae pv. oryzicola

Long

et al. 2007

J. Biosci.

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Harpin proteins from plant pathogenic bacteria can stimulate hypersensitive cell death (HCD), drought tolerance, defence responses against pathogens and insects in plants, as well as enhance plant growth. Recently, we identified nine functional fragments of HpaG;Xooc, a harpin protein from Xanthomonas oryzae pv.oryzicola, the pathogen that causes bacterial leaf streak in rice. Fragments HpaG;1-94'HpaG;10-42, and HpaG;62-138, which contain the HpaG;Xooc regions of the amino acid sequence as indicated by the number spans, exceed the parent protein in promoting growth, pathogen defence and HCD in plants. Here we report improved productivity and biochemical properties of green tea (Camellia sinensis) in response to the fragments tested in comparison with HpaG;Xooc and an inactive protein control. Field tests suggested that the four proteins markedly increased the growth and yield of green tea, and increased the leaf content of tea catechols, a group of compounds that have relevance in the prevention and treatment of human diseases. In particular, HpaG;1-94 was more active than HpaG;Xooc in expediting the growth of juvenile buds and leaves used as green tea material and increased the catechol content of processed teas. When tea shrubs were treated with HpaH;Xooc and HpaG;1-94 compared with a control, green tea yields were over 55% and 39% greater, and leaf catechols were increased by more than 64% and 72%, respectively. The expression of three homologues of the expansin genes, which regulate plant cell growth, and the CsCHS gene encoding a tea chalcone synthase, which critically regulates the biosynthesis of catechols, were induced in germinal leaves of tea plants following treatment with HpaG;1-94 or HpaG;Xooc. Higher levels of gene expression were induced by the application of HpaG;1-94 than HpaG;Xooc. Our results suggest that the harpin protein, especially the functional fragment HpaG;1-94, can be used to effectively increase the yield and improve the biochemical properties of green tea, a drink with medicinal properties.

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Section: Discussionmentioning

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Productivity and biochemical properties of green tea in response to full-length and functional fragments of HpaGXooc, a harpin protein from the bacterial rice leaf streak pathogen Xanthomonas oryzae pv. oryzicola

Long

et al. 2007

J. Biosci.

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“…Measurement of pepsinogen serum levels was carried out by 11 studies in Japan (33,35,44,49,(51)(52)(53)(55)(56)(57)(58), two studies among Japanese living abroad (48,50), several others in Europe [United Kingdom (31,40), Italy (32), Finland (43,46,54) and the Netherlands (47)], two in the United States (29,45), and one in New Zealand (59). International comparative studies included population samples from 13 (37), 4 (60), and 2 (42) nations, respectively.…”

Section: Resultsmentioning

confidence: 99%

Prevalence of Chronic Atrophic Gastritis in Different Parts of the World

Weck

Brenner

2006

Cancer Epidemiology, Biomarkers &Amp; Prevention

129

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Chronic atrophic gastritis (CAG) is a well-established precursor of intestinal gastric cancer, but epidemiologic data about its occurrence are sparse. We provide an overview on studies that examined the prevalence of CAG in different parts of the world. Articles containing data about the prevalence of chronic atrophic gastritis in unselected population samples and published until November 2005 were identified by searching the MEDLINE database. Furthermore, the references in the identified publications were screened for additional suitable studies. Studies comprising at least 50 subjects were included. Forty-one studies providing data on the prevalence of CAG in unselected population samples could be identified. CAG was determined by gastroscopy in 15 studies and by pepsinogen serum levels in 26 studies.Although results are difficult to compare due to the various definitions of CAG used, a strong increase with age, the lack of major gender differences, and strong variations between populations and population groups (in particular, relatively high rates in certain Asian populations) could be observed quite consistently. We conclude that CAG is relatively common among older adults in different parts of the world, but large variations exist. Large-scale international comparative studies with standardized methodology to determine CAG are needed to provide a coherent picture of the epidemiology of CAG in various populations. Noninvasive measurements of CAG by pepsinogen levels may be particularly suited for that purpose. (Cancer Epidemiol Biomarkers Prev 2006;15(6):1083 -94)

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“…Of UK nondrinkers, 21% had gastritis versus 35% of heavy irregular drinkers, 46% of regular drinkers, and 63% of both heavy drinkers and smokers [95]. Green tea, but not black or Oolong tea, was associated with a 37% reduced risk of CAG after adjustment for Hp and other variables in Japan [148]. No relationship was found for coffee, alcohol or smoking.…”

Section: Pathogenic Factors Of Gastritis Beyond ‘Abc'mentioning

confidence: 99%

Different Pathophysiology of Gastritis in East and West? A Western Perspective

Wirth¹,

Yang²

2016

Inflamm Intest Dis

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Background: Gastritis results from multifactorial gastric mucosal injury. Helicobacter pylori(Hp) is the main cause, and associated diseases have typical underlying patterns of gastritis. Gastric ulcer and gastric cancer (GC) develop from chronic atrophic corpus gastritis (CAG) which therefore represents the most important pattern. GC incidences in East Asia are substantially higher than elsewhere, and this should be also reflected by higher prevalences of CAG and characteristic differences in pathophysiology compared to the West. Summary: The few available comparative studies of gastritis in Eastern and Western patients are summarized. The main pathogenic factors of gastritis are discussed together with their limitations to explain local differences in disease outcome. Emphasis was put to also include less well-established pathogenic host and environmental factors of possible impact. Conclusions: CAG is more prevalent in East Asian areas with high GC incidences than the West. Geographic heterogeneity of associated diseases is due to differences in Hp prevalence and virulence as well as modulating host and environmental factors. The following may contribute to the higher burden of CAG in the East: ABD type of CagA with vacA s1 and babA2 alleles of Hp, host Lewis(b) expression in sej/sej nonsecretors, H. heilmannii, low parietal cell mass, high sodium and nitrate intake, preferences in vegetable and fruit consumption, cigarette smoking, air pollution, alcohol. Conversely, green tea, nonfermented soy products and rice may confer protective effects. Hp is on the decline, but also in a world cleared from this bacterium, differences in host genetics will continue to modify gastric disease outcome together with maintained customs as part of cultural diversity.

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Green Tea Consumption and Chronic Atrophic Gastritis: A Cross-Sectional Study in a Green Tea Production Village.

Cited by 65 publications

References 36 publications

Productivity and biochemical properties of green tea in response to full-length and functional fragments of HpaGXooc, a harpin protein from the bacterial rice leaf streak pathogen Xanthomonas oryzae pv. oryzicola

Productivity and biochemical properties of green tea in response to full-length and functional fragments of HpaGXooc, a harpin protein from the bacterial rice leaf streak pathogen Xanthomonas oryzae pv. oryzicola

Prevalence of Chronic Atrophic Gastritis in Different Parts of the World

Different Pathophysiology of Gastritis in East and West? A Western Perspective

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