Luteolin isolated from the flowers of Lonicera japonica suppresses inflammatory mediator release by blocking NF-kappaB and MAPKs activation pathways in HMC-1 cells.

Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry
Ok-Hwa KangDong-Yeul Kwon

Abstract

Luteolin (3',4',5,7-tetrahydroxylflavone) is a plant flavonoid and pharmacologically active agent that has been isolated from several plant species. In the present study, the effect of luteolin from the flowers of Lonicera japonica on phorbol 12-myristate 13-acetate (PMA) plus A23187-induced mast cell activation was examined. Luteolin significantly inhibited the induction of inflammatory cytokines such as tumor necrosis factor (TNF)-alpha, interleukin (IL)-8, IL-6 and granulocyte-macrophage colony-stimulating factor (GM-CSF) by PMA plus A23187. Moreover, luteolin attenuated cyclooxygenase (COX)-2 expression and intracellular Ca2+ levels. In activated HMC-1 cells, the phosphorylation of extra-signal response kinase (ERK 1/2) and c-jun N-terminal Kinase (JNK 1/2), but not p38 mitogen-activated protein kinase (p38 MAPK) were decreased by treatment of the cells with luteolin. Luteolin inhibited PMA plus A23187-induced nuclear factor (NF)-kappaB activation, IkappaB degradation, and luciferase activity. Furthermore, luteolin suppressed the expression of TNF-alpha, IL-8, IL-6, GM-CSF, and COX-2 through a decrease in the intracellular Ca2+ levels, and also showed a suppression of the ERK 1/2, JNK 1/2, and NF-kappaB activation. These re...Continue Reading

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Citations

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Datasets Mentioned

BETA
GM-CSF

Methods Mentioned

BETA
PMA
ELISA
nuclear translocation
nuclear
Assay
NMR
enzyme-linked immunosorbent assay
PCR
protein assay
electrophoresis

Software Mentioned

Primer Express

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