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Modulation of NKG2D, KIR2DL and cytokine production by pleurotus ostreatus glucan enhances natural killer cell cytotoxicity toward cancer cells

El-Deeb, Nehal M. and El-Adawi, Hala I. and Abd. El-Wahab, Abeer E. and Haddad, Ahmed M. and El Enshasy, Hesham A. and He, You Wen and Davis, Keith R. (2019) Modulation of NKG2D, KIR2DL and cytokine production by pleurotus ostreatus glucan enhances natural killer cell cytotoxicity toward cancer cells. Frontiers in Cell and Developmental Biology, 7 . p. 165. ISSN 2296-634X


Official URL: http://dx.doi.org/10.3389/fcell.2019.00165


Medicinal mushrooms have been used for centuries against cancer and infectious diseases. These positive biological effects of mushrooms are due in part to the indirect action of stimulating immune cells. The objective of the current study is to investigate the possible immunomodulatory effects of mushroom polysaccharides on NK cells against different cancer cells. In this current study, fruiting bodies isolated from cultured Pleurotus ostreatus were extracted and partially purified using DEAE ion-exchange chromatography. The activation action of the collected fractions on Natural Killer cells was quantified against three different cancer cell lines in the presence or absence of human recombinant IL2 using three different activation and co-culture conditions. The possible modes of action of mushroom polysaccharides against cancer cells were evaluated at the cellular and molecular levels. Our results indicate that P. ostreatus polysaccharides induced NK-cells cytotoxic effects against lung and breast cancer cells with the largest effect being against breast cancer cells (81.2%). NK cells activation for cytokine secretion was associated with upregulation of KIR2DL genes while the cytotoxic activation effect of NK cells against cancer cells correlated with NKG2D upregulation and induction of IFNγ and NO production. These cytotoxic effects were enhanced in the presence of IL2. Analysis of the most active partially purified fraction indicates that it is predominantly composed of glucans. These results indicate bioactive 6-linked glucans present in P. ostreatus extracts activate NK-cell cytotoxicity via regulation of activation and induction of IFNγ and NO. These studies establish a positive role for bioactive P. ostreatus polysaccharides in NK-cells activation and induction of an innate immune response against breast and lung cancer cells.

Item Type:Article
Uncontrolled Keywords:breast cancer, glucans
Subjects:T Technology > TP Chemical technology
Divisions:Chemical and Energy Engineering
ID Code:88160
Deposited By: Widya Wahid
Deposited On:15 Dec 2020 08:12
Last Modified:15 Dec 2020 08:12

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