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Open AccessJournal ArticleDOI

Chrysin, Apigenin and Acacetin Inhibit Tumor Necrosis Factor-Related Apoptosis—Inducing Ligand Receptor-1 (TRAIL-R1) on Activated RAW264.7 Macrophages

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TLDR
It is demonstrated that RAW264.7 macrophages exhibit TRAIL-R1 surface expression and that the tested compounds: chrysin, apigenin and acacetin can inhibit TRAIL -R1 death receptor expression level on macrophage.
Abstract
Expression level of Tumor Necrosis Factor—related apoptosis—inducing ligand (TRAIL) receptors is one of the most important factors of TRAIL-mediated apoptosis in cancer cells. We here report for the first time data concerning TRAIL-R1 and TRAIL-R2 receptor expression on RAW264.7 macrophages. Three substances belonging to flavones: chrysin, apigenin and acacetin which differ from their substituents at the 4' position in the phenyl ring were used in assays because of the variety of biological activities (e.g., anticancer activity) of the polyphenol compounds. The expression of TRAIL-R1 and TRAIL-R2 death receptors on non-stimulated and LPS (lipopolysaccharide)-stimulated macrophages was determined using flow cytometry. We demonstrate that RAW264.7 macrophages exhibit TRAIL-R1 surface expression and that the tested compounds: chrysin, apigenin and acacetin can inhibit TRAIL-R1 death receptor expression level on macrophages.

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Molecular Mechanisms and Therapeutic Effects of (−)-Epicatechin and Other Polyphenols in Cancer, Inflammation, Diabetes, and Neurodegeneration

TL;DR: The biological effects of a group of natural compounds called polyphenols, including apigenin, epigallocatechin gallate, genistein, and (−)-epicatechin are reviewed, with a focus on the latter.
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Intracellular signaling pathways of inflammation modulated by dietary flavonoids: The most recent evidence

TL;DR: The present review attempted to summarize and highlight a broad range of inflammation-associated signaling pathways modulated by flavonoids, and identified the main structural features required for the modulation of these inflammation-related pathways (hydroxylation pattern, C2=C3 double bond).
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Apigenin ameliorates streptozotocin-induced diabetic nephropathy in rats via MAPK/NF-κB/TNF-α and TGF-β1/MAPK/Fibronectin pathways

TL;DR: Apigenin ameliorated renal damage due to DN by suppressing oxidative stress and fibrosis and by inhibiting MAPK pathway, which significantly prevented MAPK activation.
Journal ArticleDOI

Chrysin, a PPAR-γ agonist improves myocardial injury in diabetic rats through inhibiting AGE-RAGE mediated oxidative stress and inflammation.

TL;DR: Chrysin significantly ameliorated isoproterenol-induced myocardial injury in diabetic rats via PPAR-γ activation and inhibition of AGE-RAGE mediated oxidative stress and inflammation.
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Apigenin: A current review on its beneficial biological activities

TL;DR: These biological effects suggest that apigenin may be a potential health promoting agent and further development will be needed to apply to the prevention and treatment of some-related diseases in the future.
References
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Journal ArticleDOI

Alternative Activation of Macrophages: Mechanism and Functions

TL;DR: In this paper, the authors assess recent research in this field, argue for a restricted definition, and explore pathways by which the T helper 2 (Th2) cell cytokines interleukin-4 (IL-4) and IL-13 mediate their effects on macrophage cell biology, their biosynthesis, and responses to a normal and pathological microenvironment.
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Identification and characterization of a new member of the TNF family that induces apoptosis

TL;DR: A novel tumor necrosis factor (TNF) family member has been cloned and characterized, and the TRAIL gene is located on chromosome 3 at position 3q26, which is not close to any other known TNF ligand family members.
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Flavonoids—Chemistry, metabolism, cardioprotective effects, and dietary sources

TL;DR: The structural requirements for the antioxidant and free radical scavenging functions of flavonoids include a hydroxyl group in carbon position three, a double bond between carbon positions two and three, carbonyl groups in carbon positions four, and polyhydroxylation of the A and B aromatic rings.
Journal ArticleDOI

The many faces of macrophage activation

TL;DR: There appears to be at least three different populations of activated macrophages with three distinct biological functions, the most recent addition is the type 2-activated macrophage, which is anti-inflammatory and preferentially induces Th2-type humoral-immune responses to antigen.
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Induction of Apoptosis by Apo-2 Ligand, a New Member of the Tumor Necrosis Factor Cytokine Family *

TL;DR: Results suggest that, along with other family members such as Fas/Apo-1 ligand and TNF, Apo-2L may serve as an extracellular signal that triggers programmed cell death.
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