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Biochem Biophys Res Commun. 2018 Sep 10;503(3):1696-1702. doi: 10.1016/j.bbrc.2018.07.101. Epub 2018 Jul 26.

Dihydromyricetin inhibits caerulin-induced TRAF3-p38 signaling activation and acute pancreatitis response.

Author information

1
Department of Gastroenterology, Shanghai Tongren Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
2
Department of Gastroenterology, Shanghai Tongren Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China. Electronic address: wangnatongren@163.com.

Abstract

Acute pancreatitis (AP) is a common inflammatory disease in gastrointestinal tract. Our previous study has shown that caerulin induces TNF receptor-associated factor 3 (TRAF3)-p38 signaling activation and pro-inflammatory response in macrophages, causing damage to co-cultured pancreatic acinar cells. Dihydromyricetin (DHM) is a flavonoid extracted from Ampelopsis grossedentata, which has displayed anti-inflammation and anti-oxidant functions. Our results here show that DHM potently inhibited caerulin-induced expression and productions of multiple pro-inflammatory cytokines (IL-1β, TNF-α and IL-17) in murine bone marrow-derived macrophages (BMDMs). DHM significantly inhibited caerulin-induced TRAF3 protein stabilization, TRAF3-mitogen-activated protein kinase kinase 3 (MKK3) association and following MKK3-p38 activation in BMDMs. Significantly, DHM was ineffective against caerulin in TRAF3-silenced BMDMs. Importantly, DHM supplement attenuated the cytotoxicity of caerulin-activated BMDMs to co-cultured pancreatic acinar cells, resulting in significantly decreased acinar cell death and apoptosis. In vivo, DHM co-administration largely attenuated pancreatic and systemic inflammation in caerulin-injected AP mice. Together, DHM inhibits caerulin-induced TRAF3-p38 signaling activation and AP response. DHM could be further studied as a potential anti-AP agent.

KEYWORDS:

Acute pancreatitis; Caerulin; Dihydromyricetin; Pro-inflammatory response; TRAF3

PMID:
30055802
DOI:
10.1016/j.bbrc.2018.07.101
[Indexed for MEDLINE]

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