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Biochim Biophys Acta. 2013 Apr;1830(4):2981-8. doi: 10.1016/j.bbagen.2013.01.018. Epub 2013 Jan 26.

Edible blue-green algae reduce the production of pro-inflammatory cytokines by inhibiting NF-κB pathway in macrophages and splenocytes.

Author information

1
Department of Nutritional Sciences, University of Connecticut, Storrs, CT 06269, USA.

Abstract

BACKGROUND:

Chronic inflammation contributes to the development of pathological disorders including insulin resistance and atherosclerosis. Identification of anti-inflammatory natural products can prevent the inflammatory diseases.

METHODS:

Anti-inflammatory effects of blue-green algae (BGA), i.e., Nostoc commune var. sphaeroides Kützing (NO) and Spirulina platensis (SP), were compared in RAW 264.7 and mouse bone marrow-derived macrophages (BMM) as well as splenocytes from apolipoprotein E knockout (apoE(-/-)) mice fed BGA.

RESULTS:

When macrophages pretreated with 100μg/ml NO lipid extract (NOE) or SP lipid extract (SPE) were activated by lipopolysaccharide (LPS), expression and secretion of pro-inflammatory cytokines, such as tumor necrosis factor α (TNFα), interleukin 1β (IL-1β), and IL-6, were significantly repressed. NOE and SPE also significantly repressed the expression of TNFα and IL-1β in BMM. LPS-induced secretion of IL-6 was lower in splenocytes from apoE(-/-) fed an atherogenic diet containing 5% NO or SP for 12weeks. In RAW 264.7 macrophages, NOE and SPE markedly decreased nuclear translocation of NF-κB. The degree of repression of pro-inflammatory gene expression by algal extracts was much stronger than that of SN50, an inhibitor of NF-κB nuclear translocation. Trichostatin A, a pan histone deacetylase inhibitor, increased basal expression of IL-1β and attenuated the repression of the gene expression by SPE. SPE significantly down-regulated mRNA abundance of 11 HDAC isoforms, consequently increasing acetylated histone 3 levels.

CONCLUSION:

NOE and SPE repress pro-inflammatory cytokine expression and secretion in macrophages and splenocytes via inhibition of NF-κB pathway. Histone acetylation state is likely involved in the inhibition.

GENERAL SIGNIFICANCE:

This study underscores natural products can exert anti-inflammatory effects by epigenetic modifications such as histone acetylation.

PMID:
23357040
PMCID:
PMC3594481
DOI:
10.1016/j.bbagen.2013.01.018
[Indexed for MEDLINE]
Free PMC Article

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