Nutrition Research and Practice

The Korean Nutrition Society (한국영양학회)
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Protaetia brevitarsis larvae extract protects against lipopolysaccharides-induced ferroptosis and inflammation by inhibiting acid sphingomyelinase

  • Woo-Jae Park (Department of Biochemistry, Chung-Ang University College of Medicine) ;
  • Eunyoung Oh (Interdisciplinary Program in Sustainable Living System, Graduate School, Korea University) ;
  • Yookyung Kim (Department of Human Ecology, Graduate School, Korea University)
  • Received : 2024.04.05
  • Accepted : 2024.05.31
  • Published : 2024.10.01
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Abstract

BACKGROUND/OBJECTIVES: Inflammation and ferroptosis are implicated in various diseases and lipopolysaccharides (LPS) have been linked with these disorders. Recently, many edible insects, such as Gryllus bimaculatus, Protaetia brevitarsis larvae (PB) and Tenebrio molitor larvae, have been recommended as alternative foods because they contain lots of nutritional sources. In this study, we explored the potential of PB extract in preventing LPS-induced inflammation and ferroptosis in Hep3B cells. MATERIALS/METHODS: PB powder was extracted using 70% ethanol and applied to Hep3B cells. Co-treatment with LPS was conducted to induce ferroptosis and inflammation. The anti-inflammatory and anti-ferroptosis mechanisms of the PB extract were confirmed using Western blot, enzyme-linked immunosorbent assay, and real-time polymerase chain reaction analysis. RESULTS: PB extract effectively prevented LPS-induced cell death and restored LPS-induced inflammatory cytokine production, NF-κB signaling, endoplasmic reticulum (ER) stress and ferroptosis. Interestingly, PB extract reduced LPS-induced ceramide increase and acid sphingomyelinase (ASMase) expression. The use of the ASMase inhibitor, desipramine, also demonstrated a reduction in these pathways, highlighting the pivotal role of ASMase in inflammation and ferroptosis. Treatment with each inhibitor revealed that ferroptosis causes ER stress and that NF-κB and MAP kinase pathways are involved in inflammation. CONCLUSION: PB emerges as a potential functional food with inhibitory effects on LPS-induced inflammation and ferroptosis, making it a promising candidate for nutritional interventions.

Keywords

References

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