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Heat-Treated Paraprobiotic Latilactobacillus sakei KU15041 and Latilactobacillus curvatus KU15003 Show an Antioxidant and Immunostimulatory Effect

  • Jun-Hyun Hyun (Department of Food Science and Biotechnology of Animal Resources, Konkuk University) ;
  • Im-Kyung Woo (Department of Food Science and Biotechnology of Animal Resources, Konkuk University) ;
  • Kee-Tae Kim (Research Institute, WithBio Inc.) ;
  • Young-Seo Park (Department of Food Science and Biotechnology, Gachon University) ;
  • Dae-Kyung Kang (Department of Animal Biotechnology, Dankook University) ;
  • Na-Kyoung Lee (Department of Food Science and Biotechnology of Animal Resources, Konkuk University) ;
  • Hyun-Dong Paik (Department of Food Science and Biotechnology of Animal Resources, Konkuk University)
  • Received : 2023.09.05
  • Accepted : 2023.09.25
  • Published : 2024.02.28

Abstract

The lactic acid bacteria, including Latilactobacillus sakei and Latilactobacillus curvatus, have been widely studied for their preventive and therapeutic effects. In this study, the underlying mechanism of action for the antioxidant and immunostimulatory effects of two strains of heat-treated paraprobiotics was examined. Heat-treated L. sakei KU15041 and L. curvatus KU15003 showed higher radical scavenging activity in both the 2-azinobis-(3-ethylbenzothiazoline-6-sulfonic acid (ABTS) and 2,2-diphenyl-1-picryl-hydrazyl (DPPH) assays than the commercial probiotic strain LGG. In addition, treatment with these two strains exhibited immunostimulatory effects in RAW 264.7 macrophages, with L. curvatus KU15003 showing a slightly higher effect. Additionally, they promoted phagocytosis and NO production in RAW 264.7 cells without any cytotoxicity. Moreover, the expression of tumor necrosis factor-α, interleukin (IL)-1β, and IL-6 was upregulated. These strains resulted in an increased expression of inducible nitric oxide synthase and cyclooxygenase-2. Moreover, the nuclear factor-κB and mitogen-activated protein kinase signaling pathways were stimulated by these strains. These findings suggest the potential of using L. sakei KU15041 and L. curvatus KU15003 in food or by themselves as probiotics with antioxidant and immune-enhancing properties.

Keywords

Acknowledgement

This work was supported by the Korea Institute of Planning and Evaluation for Technology in Food, Agriculture, and Forestry (IPET) through the High Value-added Food Technology Development Program, funded by the Ministry of Agriculture, Food and Rural Affairs (MAFRA) (#321035-5).

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