In vitro anti-influenza virus activities of sulfated polysaccharide fractions from Gracilaria lemaneiformis.
In this paper, in vitro anti-influenza virus activities of sulfated polysaccharide fractions from Gracilaria lemaneiformis were investigated. Cytotoxicities and antiviral activities of Gracilaria lemaneiformis polysaccharides (PGL), Gracilaria lemaneiformis polysaccharide fraction-1 (GL-1), Gracilaria lemaneiformis polysaccharide fraction-2 (GL-2) and Gracilaria lemaneiformis polysaccharide fraction-3 (GL-3) were studied by the Methyl thiazolyl tetrazolium (MTT) method, and the inhibitory effect against Human influenza virus H1-364 induced cytopathic effect (CPE) on MDCK cells were observed by the CPE method. In addition, the antiviral mechanism of PGL was explored by Plaque forming unit (PFU), MTT and CPE methods. The results showed: i) Cytotoxicities were not significantly revealed, and H1-364 induced CPE was also reduced treated with sulfated polysaccharide fractions from Gracilaria lemaneiformis; ii) Antiviral activities were associated with the mass percentage content of sulfate groups in polysaccharide fractions, which was about 13%, in polysaccharides (PGL and GL-2) both of which exhibited higher antiviral activity; iii) A potential antiviral mechanism to explain these observations is that viral adsorption and replication on host cells were inhibited by sulfated polysaccharides from Gracilaria lemaneiformis. In conclusion, Anti-influenza virus activities of sulfated polysaccharide fractions from Gracilaria lemaneiformis were revealed, and the antiviral activities were associated with content of sulfate groups in polysaccharide fractions.
Chen
Mei-Zhen
MZ
Department of Biology of Shantou University, Shantou, 515063, China. chenmz@stu.edu.cn
Xie
Hao-Gui
HG
Yang
La-Wei
LW
Liao
Zao-Hui
ZH
Yu
Jie
J
D000818:Animals; D000998:Antiviral Agents / Q000302:isolation & purification / Q000494:pharmacology* / Q000633:toxicity; D002460:Cell Line; D002470:Cell Survival / Q000187:drug effects; D003588:Cytopathogenic Effect, Viral / Q000187:drug effects; D004285:Dogs; D044724:Gracilaria / Q000737:chemistry*; D006801:Humans; D007251:Influenza, Human / Q000821:virology; D009975:Orthomyxoviridae / Q000187:drug effects* / Q000302:isolation & purification; D010936:Plant Extracts / Q000302:isolation & purification / Q000494:pharmacology* / Q000633:toxicity; D011134:Polysaccharides / Q000302:isolation & purification / Q000494:pharmacology* / Q000633:toxicity; D013431:Sulfates / Q000302:isolation & purification / Q000494:pharmacology / Q000633:toxicity; D013778:Tetrazolium Salts / Q000378:metabolism; D013844:Thiazoles / Q000378:metabolism; D010948:Viral Plaque Assay
D000998:Antiviral Agents; D010936:Plant Extracts; D011134:Polysaccharides; D013431:Sulfates; D013778:Tetrazolium Salts; D013844:Thiazoles; C022616:thiazolyl blue