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. 2019 Sep;234(9):16252-16262.
doi: 10.1002/jcp.28288. Epub 2019 Feb 11.

Myricetin relieves LPS-induced mastitis by inhibiting inflammatory response and repairing the blood-milk barrier

Xingchi Kan  1 , Bingrun Liu  2 , Wenjin Guo  1 , Libin Wei  3 , Yuanqing Lin  4 , Yingcheng Guo  5 , Qian Gong  1 , Yanwei Li  1 , Dianwen Xu  1 , Yu Cao  1 , Bingxu Huang  1 , Aiwen Dong  1 , He Ma  1 , Shoupeng Fu  1 , Juxiong Liu  1
Affiliations

Myricetin relieves LPS-induced mastitis by inhibiting inflammatory response and repairing the blood-milk barrier

Xingchi Kan et al. J Cell Physiol. 2019 Sep.

Abstract

Mastitis, an inflammation of mammary gland, is a serious disease that affects the health of dairy cows around the world. Myricetin, a flavonoid from Bayberry, has been reported to suppress various inflammatory response. The aim of this study was to evaluate the effect of myricetin on lipopolysaccharide (LPS)-induced in vivo and in vitro mastitis model and clarify the underlying mechanism. In vivo experiments, myricetin attenuated the severity of inflammatory lesion and neutrophil infiltration. Moreover, myricetin pretreatment induced a significant decrease in the activity of myeloperoxidase (MPO) and the production of TNF-α, IL-6, and IL-1β triggered by LPS. Myricetin pretreatment could also increase the integrity of the blood-milk barrier and upregulate the tight junction proteins in LPS-induced mice mastitis. In vitro, myricetin inhibited LPS-induced inflammatory response in mice mammary epithelial cells (mMECs). In the further mechanism studies, we found that the anti-inflammatory effect of myricetin was mediated by inhibiting LPS-induced phosphorylation of AKT, IKK-α, IκB-α, and P65 in vivo and in vitro. Collectively, these data suggested that myricetin effectively ameliorated the inflammatory response by inhibiting the AKT/IKK/NF-κB signaling pathway and repairing the integrity of blood-milk barrier in LPS-induced mice mastitis.

Keywords: AKT/IKK/NF-κB; LPS; blood-milk barrier; mastitis; myricetin.

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