Abstract Title:

The Anti-Inflammatory Effects of Lion's Mane Culinary-Medicinal Mushroom, Hericium erinaceus (Higher Basidiomycetes) in a Coculture System of 3T3-L1 Adipocytes and RAW264 Macrophages.

Abstract Source:

Int J Med Mushrooms. 2015 ;17(7):609-18. PMID: 26559695

Abstract Author(s):

Koichiro Mori, Kenji Ouchi, Noriyasu Hirasawa

Article Affiliation:

Koichiro Mori

Abstract:

Chronic low-grade inflammation in the adipose tissue accompanying obesity is thought to be an underlying driver of metabolic diseases. In this study, we aimed to investigate the efficacy of Hericium erinaceus on adipose tissue inflammation. The anti-inflammatory effects of the ethyl acetate soluble fraction of H. erinaceus (EAHE) were examined using cocultures of 3T3-L1 adipocytes and RAW264 macrophages. EAHE significantly suppressed tumor necrosis factor (TNF)-α and interleukin (IL)-6 production in cultured RAW264 macrophages stimulated by lipopolysaccharide (LPS). EAHE also caused notable inhibition of c-Jun N-terminal kinase (JNK) activation, which is thought to be involved in the suppression of proinflammatory cytokines by EAHE. In a coculture systemwith 3T3-L1 and RAW264 cells stimulated with LPS, EAHE reduced TNF-α and IL-6 concentrations in the conditioned medium and lowered the gene expression levels of these cytokines in 3T3-L1 adipocytes. Furthermore, EAHE suppressed the LPS-induced reduction of adiponectin mRNA levels in 3T3-L1 adipocytes cocultured with RAW264 macrophages. However, in 3T3-L1 adipocytes cultured alone, the concentration of LPS used in this study did not affect the gene expression levels of these adipokines. We attributed the anti-inflammatory effects of EAHE on 3T3-L1 adipocytes cocultured with RAW264 macrophagesto the suppression of Toll-like receptor 4 (TLR4) signaling and subsequent proinflammatory cytokine secretion in RAW264 cells. Our findings indicate the possibility that H. erinaceus exerts anti-inflammatory effects on macrophages through the inhibition of TLR4-JNK signaling and prevents or ameliorates adipose tissue inflammation associated with obesity.

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