Toll-like receptor 2 and Toll-like receptor 4-dependent activation of B cells by a polysaccharide from marine fungus Phoma herbarum YS4108.

Toll-like receptor 2 and Toll-like receptor 4-dependent activation of B cells by a polysaccharide from marine fungus Phoma herbarum YS4108.
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来自海洋真菌毛霉 YS4108 的多糖对 B 细胞的 Toll 样受体 2 和 Toll 样受体 4 依赖性激活

DOI:
10.1371/journal.pone.0060781
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Gao X
Gao X
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Zhang X;Ding R;Zhou Y;Zhu R;Liu W;Jin L;Yao W;Gao X

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各种天然多糖能够激活免疫系统,因此可以用作抗肿瘤治疗中的生物反应调节剂。我们之前从海洋真菌Phoma herbarum YS4108菌丝体中发现了一种均质多糖,命名为YCP,通过增强宿主免疫反应而表现出强大的体内抗肿瘤能力。为了进一步阐明 YCP 作为生物反应调节剂的作用,本研究研究了 YCP 在 B 细胞中的免疫调节活性。我们证明用小鼠脾 B 细胞刺激 YCP 会导致细胞增殖和 IgM 抗体反应的产生。 YCP 与 B 细胞的结合是直接、可饱和且可逆的事件,需要 TLR2 和 TLR4 的参与。抗体阻断或等位基因特异性突变导致的 TLR2 和 TLR4 去功能化显着损害了 B 细胞增殖和 IgM 对 YCP 的反应。 YCP 与 TLR2 和 TLR4 的相互作用导致细胞内 p38、ERK 和 JNK 的激活,以及转录因子 NF-κB 易位到细胞核中。此外,p38、ERK、JNK 和 NF-κB 的特异性抑制剂可以减弱 YCP 诱导 B 细胞增殖和 IgM 产生的能力。总而言之,这项研究首次表明 YCP 通过受体介导的机制对 B 细胞具有免疫刺激特性,该机制涉及 TLR2 和 TLR4 以及由此产生的 MAPK 和 NF-κB 信号通路的激活,从而强调了 YCP 作为肿瘤免疫治疗中有效的生物反应调节剂的作用。
Various natural polysaccharides are capable of activating the immune system and therefore can be employed as biological response modifiers in anti-tumor therapy. We previously found a homogenous polysaccharide from the mycelium of marine fungus Phoma herbarum YS4108, named YCP, exhibiting strong in vivo antitumor ability via enhancement of the host immune responses. To further elucidate the role of YCP as a biological response modifier, the immunomoduating activities of YCP in B cells was investigated in the current study. We demonstrated that stimulation of YCP with murine splenic B cells resulted in cell proliferation and generation of IgM antibody response. Binding of YCP to B cells was a direct, saturable and reversible event and required TLR2 and TLR4 involvement. TLR2 and TLR4 defunctionalization by either antibody blocking or allele-specific mutation significantly impaired the B-cell proliferative and IgM responses to YCP. YCP interaction with TLR2 and TLR4 led to the activation of intracellular p38, ERK and JNK, as well as the translocation of transcriptional factor NF-κB into nucleus. Furthermore, specific inhibitors of p38, ERK, JNK and NF-κB could attenuate the ability of YCP to induce B cell proliferation and IgM production. Taken together, this study has indicated for the first time the immunostimulating properties of YCP on B cells through a receptor-mediated mechanism, which involves TLR2 and TLR4 and resultant activation of MAPK and NF-κB signaling pathways, thereby highlighting the role of YCP as an efficacious biological response modifier in oncologic immunotherapy.
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