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Molecules 2017, 22(1), 116;

Radix isatidis Polysaccharides Inhibit Influenza a Virus and Influenza A Virus-Induced Inflammation via Suppression of Host TLR3 Signaling In Vitro

State Key Laboratory of Respiratory Disease, National Clinical Research Center for Respiratory Disease, Guangzhou Institute of Respiratory Disease, First Affiliated Hospital of Guangzhou Medical University, (Guangzhou Medical University), Guangzhou 510120, China
The First Hospital of Yulin, Yuxi Da Dao Road, Yulin 719000, China
Guangdong Provincial Hospital of Traditional Chinese Medicine, Guangzhou University of Traditinal Chinese Medicine, Guangzhou 510180, China
Shanghai Key Laboratory of Functional Materials Chemistry, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China
Macau University of Science and Technology, AvenidaWai Long, Taipa, Macau 519020, China
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editor: Christopher W.K. Lam
Received: 28 November 2016 / Revised: 8 January 2017 / Accepted: 9 January 2017 / Published: 11 January 2017
(This article belongs to the Collection Herbal Medicine Research)
Full-Text   |   PDF [1435 KB, uploaded 11 January 2017]   |  


Influenza remains one of the major epidemic diseases worldwide, and rapid virus replication and collateral lung tissue damage caused by excessive pro-inflammatory host immune cell responses lead to high mortality rates. Thus, novel therapeutic agents that control influenza A virus (IAV) propagation and attenuate excessive pro-inflammatory responses are needed. Polysaccharide extract from Radix isatidis, a traditional Chinese herbal medicine, exerted potent anti-IAV activity against human seasonal influenza viruses (H1N1 and H3N2) and avian influenza viruses (H6N2 and H9N2) in vitro. The polysaccharides also significantly reduced the expression of pro-inflammatory cytokines (IL-6) and chemokines (IP-10, MIG, and CCL-5) stimulated by A/PR/8/34 (H1N1) at a range of doses (7.5 mg/mL, 15 mg/mL, and 30 mg/mL); however, they were only effective against progeny virus at a high dose. Similar activity was detected against inflammation induced by avian influenza virus H9N2. The polysaccharides strongly inhibited the protein expression of TLR-3 induced by PR8, suggesting that they impair the upregulation of pro-inflammatory factors induced by IAV by inhibiting activation of the TLR-3 signaling pathway. The polysaccharide extract from Radix isatidis root therefore has the potential to be used as an adjunct to antiviral therapy for the treatment of IAV infection. View Full-Text
Keywords: anti-inflammatory; antiviral; polysaccharides; Radix isatidis; TLR-3 anti-inflammatory; antiviral; polysaccharides; Radix isatidis; TLR-3

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Li, Z.; Li, L.; Zhou, H.; Zeng, L.; Chen, T.; Chen, Q.; Zhou, B.; Wang, Y.; Chen, Q.; Hu, P.; Yang, Z. Radix isatidis Polysaccharides Inhibit Influenza a Virus and Influenza A Virus-Induced Inflammation via Suppression of Host TLR3 Signaling In Vitro. Molecules 2017, 22, 116.

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