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1. (Article ID: 8616)
 
Luo Q, Yan L, Xu P, Xiong C, Yang Z, Hu P, Hu H, Hong R
Discovery of a polysaccharide from the fruiting bodies of Lepista sordida as potent inhibitors of indoleamine 2, 3-dioxygenase (IDO) in HepG2 cells via blocking of STAT1-mediated JAK-PKC-δ signaling pathways
Carbohydrate Polymers 197 (2018) 540-547
 

The present study examined the role of a polysaccharide (LSP, 25 and 100 μg/ml) from the fruiting bodies of Lepista sordid on the immunosuppressive enzyme indoleamine 2, 3-dioxygenase (IDO) in HepG2 cells, and the possible mechanism of action. IDO expression and kynurenine production from LSP-treated HepG2 cells following IFN-γ stimulation were dramatically inhibited by LSP treatment. In line with this, the medium of HepG2 cells pretreated with LSP improved the survival rate of primary CD4+ and CD8+ T cells as compared with IFN-γ-treated control cells. Moreover, tyrosine 701 and serine 727 phosphorylation of STAT1 were dramatically reduced by LSP pretreatment in IFN-γ-stimulated HepG2 cells. Furthermore phosphorylation of JAK-1 and JAK-2 was also inhibited by LSP. Additionally, two IDO promoters (GAS and ISRE) were inhibited in cells pretreated with LSP prior to IFN-γ exposure. These findings suggest that LSP exerts antitumor effects on HepG2 cells by inhibiting IDO via JAK-PKC-δ-STAT1 signaling pathway.

hepatocellular carcinoma (HCC), IFN-γ, indoleamine 2, 3-dioxygenase (IDO), JAK-PKC-δ-STAT1 signaling pathway, Lepista sordid polysaccharide

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2. (Article ID: 8704)
 
Oleinikova GK, Denisenko VA, Berdyshev DV, Pushilin MA, Kirichuk NN, Menzorova NI, Kuzmich AS, Yurchenko EA, Zhuravleva OI, Afiyatullov SS
Two new sesterterpenoids, terretonins H and I, from the marine-derived fungus Aspergillus ustus
Phytochemistry Letters 17 (2016) 135-139
 

Two new sesterterpenoids, terretonins H(1) and I(2), together with two known compounds, strobilactone A(3) and cerebroside D(4), were isolated from the lipophilic extract of the marine-derived fungus Aspergillus ustus KMM 4664. The structures of compounds 1 and 2 were determined based on spectroscopic methods and confirmed by X-ray crystallographic analysis of terretonin H. All compounds were tested for cytotoxic and embryotoxic effects using sperm and developing embryos of the sea urchin Strongylocentrotus intermedius and human cancer cells.

terretonin, sesterterpenoids, Aspergillus ustus, Strongylocentrotus intermedius

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3. (Article ID: 11423)
 
Kisiel W, Janeczko Z, Zgud-Walaszek M
A germacradiene glycoside from roots of Pimpinella saxifraga
Phytochemistry 49(7) (1998) 2031-2033
 

A new germacradiene glycoside was found to occur in the roots of Pimpinella saxifraga. The structure of its acetylation product was determined by spectroscopic methods, including 2D NMR techniques.

glycoside, sesquiterpene, Umbelliferae, Pimpinella saxifraga, germacradiene

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