Document Detail

Antiviral activity and mode of action of caffeoylquinic acids from Schefflera heptaphylla (L.) Frodin.
MedLine Citation:
PMID:  16140400     Owner:  NLM     Status:  MEDLINE    
Schefflera heptaphylla is a popular medicinal plant in southern China. Three caffeoylquinic acid derivatives, namely 3,4-di-O-caffeoylquinic acid, 3,5-di-O-caffeoylquinic acid, and 3-O-caffeoylquinic acid, were isolated from this plant and investigated for their antiviral activity against respiratory syncytial virus (RSV). 3,4-Di-O-caffeoylquinic acid and 3,5-di-O-caffeoylquinic acid possessed potent anti-RSV activity. The median inhibitory concentrations (IC50) of 3,4-di-O-caffeoylquinic acid and 3,5-di-O-caffeoylquinic acid against RSV were 2.33 microM (1.2 microg/ml) and 1.16 microM (0.6 microg/ml), respectively, in a plaque reduction assay. The dicaffeoylquinic acids exhibited minimal cytotoxicity against HEp-2 cells with median cytotoxic concentration (CC50) higher than 1000 microM. The maximal non-cytotoxic concentration (MNCC) of the two dicaffeoylquinic acids were about 96.7 microM, which suggested their anti-RSV effect was not due to cytotoxicity. The antiviral action of 3,4-di-O-caffeoylquinic acid and 3,5-di-O-caffeoylquinic acid was specific against RSV, as they had no obvious antiviral activity against influenza A (Flu A), Coxsackie B3 (Cox B3), and Herpes simplex type one (HSV-1) viruses. Studies were performed that indicated that the dicaffeoylquinic acids could inhibit RSV directly, extracellularly, but only at much higher concentrations than seen in standard assays. Moreover, they could not inhibit RSV attachment to host cells, and could not protect HEp-2 cells from RSV infection at lower concentrations. The data suggest that the compounds exerted their anti-RSV effects via the inhibition of virus-cell fusion in the early stage, and the inhibition of cell-cell fusion at the end of the RSV replication cycle.
Yaolan Li; Paul P H But; Vincent E C Ooi
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Antiviral research     Volume:  68     ISSN:  0166-3542     ISO Abbreviation:  Antiviral Res.     Publication Date:  2005 Oct 
Date Detail:
Created Date:  2005-09-26     Completed Date:  2006-01-12     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8109699     Medline TA:  Antiviral Res     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  1-9     Citation Subset:  IM    
Department of Chemistry, Jinan University, Guangzhou, China.
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MeSH Terms
Antiviral Agents / chemistry,  pharmacology*
Araliaceae / chemistry*
Cell Line, Tumor
Dose-Response Relationship, Drug
Plaque Assay
Quinic Acid / analogs & derivatives*,  chemistry,  isolation & purification,  pharmacology
Respiratory Syncytial Viruses / drug effects*,  growth & development
Species Specificity
Time Factors
Reg. No./Substance:
0/Antiviral Agents; 0/caffeoylquinic acid; 77-95-2/Quinic Acid

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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