Nutrition Research and Practice

  • 제16권6호
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  • Pages.685-699
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  • 2022
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  • 1976-1457(pISSN)
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  • 2005-6168(eISSN)
한국영양학회 (The Korean Nutrition Society)
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Immunostimulatory activity of hydrolyzed and fermented Platycodon grandiflorum extract occurs via the MAPK and NF-κB signaling pathway in RAW 264.7 cells

  • Jae In, Jung (Regional Strategic Industry Innovation Center, Hallym University) ;
  • Hyun Sook, Lee (Department of Food Science & Nutrition, Dongseo University) ;
  • So Mi, Kim (Regional Strategic Industry Innovation Center, Hallym University) ;
  • Soyeon, Kim (R&D Center, World Food Services Co. Ltd.) ;
  • Jihoon, Lim (R&D Center, World Food Services Co. Ltd.) ;
  • Moonjea, Woo (R&D Center, World Food Services Co. Ltd.) ;
  • Eun Ji, Kim (Regional Strategic Industry Innovation Center, Hallym University)
  • 투고 : 2021.10.29
  • 심사 : 2022.03.25
  • 발행 : 2022.12.01
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초록

BACKGROUND/OBJECTIVES: Platycodon grandiflorum (PG) has long been known as a medicinal herb effective in various diseases, including bronchitis and asthma, but is still more widely used for food. Fermentation methods are being applied to increase the pharmacological composition of PG extracts and commercialize them with high added value. This study examines the hydrolyzed and fermented PG extract (HFPGE) fermented with Lactobacillus casei in RAW 264.7 cells, and investigates the effect of amplifying the immune and the probable molecular mechanism. MATERIALS/METHODS: HFPGE's total phenolic, flavonoid, saponin, and platycodin D contents were analyzed by colorimetric analysis or high-performance liquid chromatography. Cell viability was measured by the MTT assay. Phagocytic activity was analyzed by a phagocytosis assay kit, nitric oxide (NO) production by a Griess reagent system, and cytokines by enzyme-linked immunosorbent assay kits. The mRNA expressions of inducible nitric oxide synthase (iNOS) and cytokines were analyzed by reverse transcription-polymerase chain reaction, whereas MAPK and nuclear factor (NF)-κB activation were analyzed by Western blots. RESULTS: Compared to PGE, HFPGE was determined to contain 13.76 times and 6.69 times higher contents of crude saponin and platycodin D, respectively. HFPGE promoted cell proliferation and phagocytosis in RAW 264.7 cells and regulated the NO production and iNOS expression. Treatment with HFPGE also resulted in increased production of interleukin (IL)-1β, IL-6, tumor necrosis factor (TNF)-α, C-X-C motif chemokine ligand10, granulocyte-colony-stimulating factor, granulocyte-macrophage colony-stimulating factor, and monocyte chemoattractant protein-1, and the mRNA expressions of these cytokines. HFPGE also resulted in significantly increasing the phosphorylation of NF-κB p65, extracellular signal-regulated kinase, and c-Jun N-terminal kinase. CONCLUSIONS: Taken together, our results imply that fermentation and hydrolysis result in the extraction of more active ingredients of PG. Furthermore, we determined that HFPGE exerts immunostimulatory activity via the MAPK and NF-κB signaling pathways.

키워드

과제정보

This research was supported by an R&D grant from the Gangneung Science & Industry Promotion Agency of Korea in 2020-2021.

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