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Ethyl acetate extract of Kaempferia parviflora inhibits Helicobacter pylori-associated mammalian cell inflammation by regulating proinflammatory cytokine expression and leukocyte chemotaxis

Authors
  • Nemidkanam, Variya1
  • Kato, Yuko2
  • Kubota, Tetsuo2
  • Chaichanawongsaroj, Nuntaree1
  • 1 Chulalongkorn University, Pathumwan, Bangkok, Thailand , Bangkok (Thailand)
  • 2 Tokyo Medical and Dental University Graduate School of Health Care Sciences, Tokyo, Japan , Tokyo (Japan)
Type
Published Article
Journal
BMC Complementary Medicine and Therapies
Publisher
BioMed Central
Publication Date
Apr 22, 2020
Volume
20
Issue
1
Identifiers
DOI: 10.1186/s12906-020-02927-2
Source
Springer Nature
Keywords
License
Green

Abstract

BackgroundKaempferia parviflora (KP) has been used in traditional Thai medicine to cure gastrointestinal disorders since ancient times. Helicobacter pylori is an initiating factor in gastric pathogenesis via activation of massive inflammation, the cumulative effect of which leads to gastric disease progression, including gastric carcinogenesis. Accordingly, the effect of a crude ethyl acetate extract of KP (CEAE-KP) on proinflammatory cytokine production and cell chemotaxis was the focus of this study.MethodsThe cytotoxicity of CEAE-KP (8–128 μg/ml) on AGS (gastric adenocarcinoma) cells was determined at 6, 12 and 24 h using an MTT assay. The effect of CEAE-KP on H. pylori-induced interleukin (IL)-8 production by AGS cells was evaluated by ELISA and RT-PCR. The effect of CEAE-KP on monocyte and neutrophil chemotaxis to H. pylori soluble protein (sHP) and IL-8, respectively, was determined using a Boyden chamber assay with THP-1 or HL-60 cells.ResultsCEAE-KP reduced AGS cell viability in a concentration- and time-dependent manner, but at 8–16 μg/ml, it was not cytotoxic after 6–24 h of exposure. Coculture of AGS cells with CEAE-KP at a noncytotoxic concentration of 16 μg/ml and H. pylori reduced IL-8 secretion by ~ 60% at 12 h, which was consistent with the decreased level of mRNA expression, and inhibited neutrophil chemotaxis to IL-8. sHP (100 ng/ml) induced marked monocyte chemoattraction, and this was decreased by ~ 60% by CEAE-KP.ConclusionCEAE-KP might serve as a potent alternative medicine to ameliorate the inflammation mediated by H. pylori infection.

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