Mechanism by which ma-xing-shi-gan-tang inhibits the entry of influenza virus

Chung Fan Hsieh, Cheng Wei Lo, Chih Hao Liu, Shiming Lin, Hung Rong Yen, Tzou Yien Lin, Jim Tong Horng

研究成果: 雜誌貢獻文章

28 引文 (Scopus)

摘要

Ethnopharmacological relevance: Ma-xing-shi-gan-tang (MXSGT, aka maxing shigan powder), a Chinese herbal decoction, has been used for the treatment of the common cold, fever, and influenza virus infections. However, the underlying mechanisms of its activity against the influenza virus are not fully understood. In this study, we examined the antiviral effects of MXSGT in influenza-virus-infected MDCK cells and their underlying mechanisms, including the damage of the viral surface ultrastructure and the consequent inhibition of viral entry. Materials and methods: The antiviral activity of nontoxic concentrations of MXSGT against influenza virus A/WSN/33 was examined by assaying (neutralization assay) its inhibition of the virus-induced cytopathic effects. The mode of MXSGT action was first examined with a time-of-addition assay of synchronized infections, followed by viral attachment and penetration assays. Viral endocytosis was evaluated with attachment and penetration assays. We also performed assays related to the inhibition of viral entry, such as neuraminidase activity, hemagglutinin activity, and phosphoinositide-3-kinase (PI3K)/AKT phosphorylation assays. The inhibition of viral replication was demonstrated by quantitative real-time PCR, immunoblotting, and immunofluorescence microscopy. The surface ultrastructure of the MXSGT-treated virus was revealed by atomic force microscopy. Results: MXSGT exhibited an EC50 of 0.83±0.41 mg/ml against influenza virus A/WSN/33 (H1N1), with broad-spectrum inhibitory activity against different strains of human influenza A viruses, including clinical oseltamivir-resistant isolates and an H1N1pdm strain. The synthesis of both viral RNA and protein was profoundly inhibited when the cells were treated with MXSGT. The time-of-addition assay demonstrated that MXSGT blocks the virus entry phase. This was confirmed with attachment and penetration assays, in which MXSGT showed similar inhibitory potencies (IC50 of 0.58±0.07 and 0.47±0.08 mg/ml). High-resolution images and quantitative measurements made with atomic force microscopy confirmed that the viral surface structure was disrupted by MXSGT. We also established that viral entry, regulated by the PI3K/AKT signaling pathway, was abolished by MXSGT. Conclusions: Our results give scientific support to the use of MXSGT in the treatment of influenza virus infections. MXSGT has potential utility in the management of seasonal pandemics of influenza virus infections, like other clinically available drugs.
原文英語
頁(從 - 到)57-67
頁數11
期刊Journal of Ethnopharmacology
143
發行號1
DOIs
出版狀態已發佈 - 八月 30 2012
對外發佈Yes

指紋

Orthomyxoviridae
Virus Diseases
Influenza A virus
1-Phosphatidylinositol 4-Kinase
Atomic Force Microscopy
Antiviral Agents
Viruses
Oseltamivir
Rhinovirus
Virus Internalization
Viral Structures
Madin Darby Canine Kidney Cells
Viral RNA
Hemagglutinins
Neuraminidase
Viral Proteins
Pandemics
Endocytosis
Fluorescence Microscopy
Immunoblotting

ASJC Scopus subject areas

  • Pharmacology
  • Drug Discovery

引用此文

Mechanism by which ma-xing-shi-gan-tang inhibits the entry of influenza virus. / Hsieh, Chung Fan; Lo, Cheng Wei; Liu, Chih Hao; Lin, Shiming; Yen, Hung Rong; Lin, Tzou Yien; Horng, Jim Tong.

於: Journal of Ethnopharmacology, 卷 143, 編號 1, 30.08.2012, p. 57-67.

研究成果: 雜誌貢獻文章

Hsieh, Chung Fan ; Lo, Cheng Wei ; Liu, Chih Hao ; Lin, Shiming ; Yen, Hung Rong ; Lin, Tzou Yien ; Horng, Jim Tong. / Mechanism by which ma-xing-shi-gan-tang inhibits the entry of influenza virus. 於: Journal of Ethnopharmacology. 2012 ; 卷 143, 編號 1. 頁 57-67.
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abstract = "Ethnopharmacological relevance: Ma-xing-shi-gan-tang (MXSGT, aka maxing shigan powder), a Chinese herbal decoction, has been used for the treatment of the common cold, fever, and influenza virus infections. However, the underlying mechanisms of its activity against the influenza virus are not fully understood. In this study, we examined the antiviral effects of MXSGT in influenza-virus-infected MDCK cells and their underlying mechanisms, including the damage of the viral surface ultrastructure and the consequent inhibition of viral entry. Materials and methods: The antiviral activity of nontoxic concentrations of MXSGT against influenza virus A/WSN/33 was examined by assaying (neutralization assay) its inhibition of the virus-induced cytopathic effects. The mode of MXSGT action was first examined with a time-of-addition assay of synchronized infections, followed by viral attachment and penetration assays. Viral endocytosis was evaluated with attachment and penetration assays. We also performed assays related to the inhibition of viral entry, such as neuraminidase activity, hemagglutinin activity, and phosphoinositide-3-kinase (PI3K)/AKT phosphorylation assays. The inhibition of viral replication was demonstrated by quantitative real-time PCR, immunoblotting, and immunofluorescence microscopy. The surface ultrastructure of the MXSGT-treated virus was revealed by atomic force microscopy. Results: MXSGT exhibited an EC50 of 0.83±0.41 mg/ml against influenza virus A/WSN/33 (H1N1), with broad-spectrum inhibitory activity against different strains of human influenza A viruses, including clinical oseltamivir-resistant isolates and an H1N1pdm strain. The synthesis of both viral RNA and protein was profoundly inhibited when the cells were treated with MXSGT. The time-of-addition assay demonstrated that MXSGT blocks the virus entry phase. This was confirmed with attachment and penetration assays, in which MXSGT showed similar inhibitory potencies (IC50 of 0.58±0.07 and 0.47±0.08 mg/ml). High-resolution images and quantitative measurements made with atomic force microscopy confirmed that the viral surface structure was disrupted by MXSGT. We also established that viral entry, regulated by the PI3K/AKT signaling pathway, was abolished by MXSGT. Conclusions: Our results give scientific support to the use of MXSGT in the treatment of influenza virus infections. MXSGT has potential utility in the management of seasonal pandemics of influenza virus infections, like other clinically available drugs.",
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T1 - Mechanism by which ma-xing-shi-gan-tang inhibits the entry of influenza virus

AU - Hsieh, Chung Fan

AU - Lo, Cheng Wei

AU - Liu, Chih Hao

AU - Lin, Shiming

AU - Yen, Hung Rong

AU - Lin, Tzou Yien

AU - Horng, Jim Tong

PY - 2012/8/30

Y1 - 2012/8/30

N2 - Ethnopharmacological relevance: Ma-xing-shi-gan-tang (MXSGT, aka maxing shigan powder), a Chinese herbal decoction, has been used for the treatment of the common cold, fever, and influenza virus infections. However, the underlying mechanisms of its activity against the influenza virus are not fully understood. In this study, we examined the antiviral effects of MXSGT in influenza-virus-infected MDCK cells and their underlying mechanisms, including the damage of the viral surface ultrastructure and the consequent inhibition of viral entry. Materials and methods: The antiviral activity of nontoxic concentrations of MXSGT against influenza virus A/WSN/33 was examined by assaying (neutralization assay) its inhibition of the virus-induced cytopathic effects. The mode of MXSGT action was first examined with a time-of-addition assay of synchronized infections, followed by viral attachment and penetration assays. Viral endocytosis was evaluated with attachment and penetration assays. We also performed assays related to the inhibition of viral entry, such as neuraminidase activity, hemagglutinin activity, and phosphoinositide-3-kinase (PI3K)/AKT phosphorylation assays. The inhibition of viral replication was demonstrated by quantitative real-time PCR, immunoblotting, and immunofluorescence microscopy. The surface ultrastructure of the MXSGT-treated virus was revealed by atomic force microscopy. Results: MXSGT exhibited an EC50 of 0.83±0.41 mg/ml against influenza virus A/WSN/33 (H1N1), with broad-spectrum inhibitory activity against different strains of human influenza A viruses, including clinical oseltamivir-resistant isolates and an H1N1pdm strain. The synthesis of both viral RNA and protein was profoundly inhibited when the cells were treated with MXSGT. The time-of-addition assay demonstrated that MXSGT blocks the virus entry phase. This was confirmed with attachment and penetration assays, in which MXSGT showed similar inhibitory potencies (IC50 of 0.58±0.07 and 0.47±0.08 mg/ml). High-resolution images and quantitative measurements made with atomic force microscopy confirmed that the viral surface structure was disrupted by MXSGT. We also established that viral entry, regulated by the PI3K/AKT signaling pathway, was abolished by MXSGT. Conclusions: Our results give scientific support to the use of MXSGT in the treatment of influenza virus infections. MXSGT has potential utility in the management of seasonal pandemics of influenza virus infections, like other clinically available drugs.

AB - Ethnopharmacological relevance: Ma-xing-shi-gan-tang (MXSGT, aka maxing shigan powder), a Chinese herbal decoction, has been used for the treatment of the common cold, fever, and influenza virus infections. However, the underlying mechanisms of its activity against the influenza virus are not fully understood. In this study, we examined the antiviral effects of MXSGT in influenza-virus-infected MDCK cells and their underlying mechanisms, including the damage of the viral surface ultrastructure and the consequent inhibition of viral entry. Materials and methods: The antiviral activity of nontoxic concentrations of MXSGT against influenza virus A/WSN/33 was examined by assaying (neutralization assay) its inhibition of the virus-induced cytopathic effects. The mode of MXSGT action was first examined with a time-of-addition assay of synchronized infections, followed by viral attachment and penetration assays. Viral endocytosis was evaluated with attachment and penetration assays. We also performed assays related to the inhibition of viral entry, such as neuraminidase activity, hemagglutinin activity, and phosphoinositide-3-kinase (PI3K)/AKT phosphorylation assays. The inhibition of viral replication was demonstrated by quantitative real-time PCR, immunoblotting, and immunofluorescence microscopy. The surface ultrastructure of the MXSGT-treated virus was revealed by atomic force microscopy. Results: MXSGT exhibited an EC50 of 0.83±0.41 mg/ml against influenza virus A/WSN/33 (H1N1), with broad-spectrum inhibitory activity against different strains of human influenza A viruses, including clinical oseltamivir-resistant isolates and an H1N1pdm strain. The synthesis of both viral RNA and protein was profoundly inhibited when the cells were treated with MXSGT. The time-of-addition assay demonstrated that MXSGT blocks the virus entry phase. This was confirmed with attachment and penetration assays, in which MXSGT showed similar inhibitory potencies (IC50 of 0.58±0.07 and 0.47±0.08 mg/ml). High-resolution images and quantitative measurements made with atomic force microscopy confirmed that the viral surface structure was disrupted by MXSGT. We also established that viral entry, regulated by the PI3K/AKT signaling pathway, was abolished by MXSGT. Conclusions: Our results give scientific support to the use of MXSGT in the treatment of influenza virus infections. MXSGT has potential utility in the management of seasonal pandemics of influenza virus infections, like other clinically available drugs.

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KW - Attachment assay

KW - Cytopathic effect

KW - Influenza virus

KW - Ma-hsing-kan-shih-tang

KW - MXSGT

KW - Penetration assay

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