Nutrition Research and Practice

The Korean Nutrition Society (한국영양학회)
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Pear pomace alleviated atopic dermatitis in NC/Nga mice and inhibited LPS-induced inflammation in RAW 264.7 macrophages

  • You, Mikyoung (Nutrition Research Institute, University of North Carolina) ;
  • Wang, Ziyun (Department of Food and Nutrition, Mokpo National University) ;
  • Kim, Hwa-Jin (Department of Food and Nutrition, Mokpo National University) ;
  • Lee, Young-Hyun (Department of Food and Nutrition, Mokpo National University) ;
  • Kim, Hyeon-A (Department of Food and Nutrition, Mokpo National University)
  • Received : 2021.08.30
  • Accepted : 2021.11.25
  • Published : 2022.10.01
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Abstract

BACKGROUND/OBJECTIVES: Poorly regulated inflammation is believed to be the most predominant factor that can result in a wide scope of diseases including atopic dermatitis (AD). Despite many studies on the effect of pear pomace in obesity-related disorders including dysregulated gut microbiota, the protective effect of pear pomace in AD is still unknown. This study aimed to evaluate the effect of pear pomace ethanol extract (PPE) on AD by inhibiting inflammation. MATERIALS/METHODS: In the in vivo experiment, 2, 4-dinitrochlorobenzene (DNCB) was applied to NC/Nga mice to induce AD-like skin lesions. After the induction, PPE was administered daily by oral gavage for 4 weeks. The clinical severity score, serum IgE levels, spleen weight, histological changes in dorsal skin, and inflammation-related proteins were measured. In the cell study, RAW 264.7 cells were pretreated with PPE before stimulation with lipopolysaccharide (LPS). Nitrite oxide (NO) production and nuclear factor kappa B (NF-𝛋B) protein expression were detected. RESULTS: Compared to the AD control (AD-C) group, IgE levels were dramatically decreased via PPE treatment. PPE significantly reduced scratching behavior, improved skin symptoms, and decreased ear thickness compared to the AD-C group. In addition, PPE inhibited the DNCB-induced expression of inducible nitrite oxide synthase (iNOS), the receptor for advanced glycation end products, extracellular signal-regulated kinase (ERK) 1/2, and NF-𝛋B. PPE inhibited the LPS-induced overproduction of NO and the enhanced expression of iNOS and cyclooxygenase-2. Moreover, the phosphorylation of ERK1/2 and NF-𝛋B in RAW 264.7 cells was suppressed by PPE. CONCLUSIONS: These results suggest that PPE could be explored as a therapeutic agent to prevent AD.

Keywords

Acknowledgement

This work was supported by the Bio-Industry Technology Development Program of the Ministry of Agriculture, Doo fans Rural Affairs (313019-03-3-HD030).

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