L-Methionine inhibits 4-hydroxy-2-nonenal accumulation and suppresses inflammation in growing rats

Zhengxuan Wang; Mingcai Liang; Hui Li; Bingxiao Liu; Lin Yang

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자료유형: 학술저널

저자정보: Zhengxuan Wang (Harbin Institute of Technology) Mingcai Liang (Harbin Institute of Technology) Hui Li (Harbin Institute of Technology) Bingxiao Liu (Harbin Institute of Technology) Lin Yang (Harbin Institute of Technology)

저널정보: 대한지역사회영양학회 Nutrition Research and Practice Nutrition Research and Practice Vol.16 No.6

발행연도: 2022.12

수록면: 729 - 744 (16page)

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BACKGROUND/OBJECTIVES: 4-Hydroxy-2-nonenal (HNE) is a biomarker for oxidative stress to induce inflammation. Methionine is an essential sulfur-containing amino acid with antioxidative activity. On the other hand, the evidence on whether and how methionine can depress HNE-derived inflammation is lacking. In particular, the link between the regulation of the nuclear factor-κB (NF-κB) signaling pathway and methionine intake is unclear. This study examined the link between depression from HNE accumulation and the anti-inflammatory function of L-methionine in rats.
MATERIALS/METHODS: Male Wistar rats (3-week-old, weighing 70–80 g) were administered different levels of L-methionine orally at 215.0, 268.8, 322.5, and 430.0 ㎎/㎏ body weight for two weeks. The control group was fed commercial pellets. The hepatic HNE contents and the protein expression and mRNA levels of the inflammatory mediators were measured. The interleukin-10 (IL-10) and glutathione S-transferase (GST) levels were also estimated.
RESULTS: Compared to the control group, hepatic HNE levels were reduced significantly in all groups fed L-methionine, which were attributed to the stimulation of GST by L-methionine. With decreasing HNE levels, L-methionine inhibited the activation of NF-κB by up-regulating inhibitory κBα and depressing phosphoinositide 3 kinase/protein kinase B. The mRNA levels of the inflammatory mediators (cyclooxygenase-2, interleukin-1β, interleukin-6, inducible nitric oxide synthase, tumor necrotic factor alpha) were decreased significantly by L-methionine. In contrast, the protein expression of these inflammatory mediators was effectively down regulated by L-methionine. The anti-inflammatory action of L-methionine was also reflected by the up-regulation of IL-10.
CONCLUSIONS: This study revealed a link between the inhibition of HNE accumulation and the depression of inflammation in growing rats, which was attributed to L-methionine availability. The anti-inflammatory mechanism exerted by L-methionine was to inhibit NF-κB activation and to up-regulate GST.

#L-Methionine #4-hydroxy-2-nonenal #inflammation #NF-κB #GST

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