Inhibitory effects of flavonoids extracted from Nepalese propolis on the LPS signaling pathway.

Abstract:

:Flavonoids, particularly those derived from plants, harbor biological effects such as anti-inflammation and the inhibition of cancer progression. In the present study, we investigated the effects of 10 kinds of flavonoids isolated from Nepalese propolis on the LPS signaling pathway in order to clarify their anti-inflammatory activities. Five types of flavonoids: isoliquiritigenin, chrysin, 3',4'-dihydroxy-4-methoxydalbergione, 4-methoxydalbergion, and cearoin, markedly inhibited inflammatory responses including LPS-induced NO production by suppressing the expression of iNOS mRNA and LPS-induced mRNA expression of TNFα and CCL2. Their inhibitory effects on LPS-induced inflammatory responses correlated with the intensities of these flavonoids to suppress the LPS-induced activation of nuclear factor κB (NF-κB), an essential transcription factor for the mRNA expression of iNOS, TNFα, and CCL2. Among these flavonoids, 3',4'-dihydroxy-4-methoxydalbergione and 4-methoxydalbergion markedly inhibited the LPS-induced activation of IKK, thereby abrogating the degradation of IκBα and nuclear localization of NF-κB. On the other hand, isoliquiritigenin, chrysin, and cearoin failed to inhibit these signaling steps, but suppressed the transcriptional activity of NF-κB, which caused their anti-inflammatory effects. The results of the present study revealed that these five kinds of flavonoids are the components of Nepalese propolis that exhibit anti-inflammatory activities with a different regulatory mechanism for the activation of NF-κB.

journal_name

Int Immunopharmacol

authors

Funakoshi-Tago M,Ohsawa K,Ishikawa T,Nakamura F,Ueda F,Narukawa Y,Kiuchi F,Tamura H,Tago K,Kasahara T

doi

10.1016/j.intimp.2016.10.008

subject

Has Abstract

pub_date

2016-11-01 00:00:00

pages

550-560

eissn

1567-5769

issn

1878-1705

pii

S1567-5769(16)30413-1

journal_volume

40

pub_type

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