Antiviral and Antibacterial Effects of the Effective Site of Traditional Chinese Medicine / 中药新药与临床药理

ABSTRACT

Objective To study the antiviral and antibacterial effects of the effective site of traditional Chinese medicine(TCM-ES).Methods Chicken embryoes were infected with influenza virus A(FM1 strain) and pre-injected with TCM-ES by means of chicken-embryo inoculation technique,and the antiviral effect of TCM-ES on chicken embryo was assayed by detecting the hemagglutination titers in allantoic fluids.Mice were orally pretreated with various dosages of drugs twice daily for 3 days,then were given drugs continuously for another 4 days following FM1 infection.The protective effects of TCM-ES on mice infected with FM1 were assayed by calculating the weight,index of lung,death-protection rate,and life-prolongation rate,etc.Ribavirin was used as the positive control.In addition,the antibacterial effects of TCM-ES were observed by detecting the minimum inhibitory concentration(MIC) and minimum bactericidal concentration(MBC) by test-tube dilution method.Results In chicken embryo experiments,TCM-ES showed a potential inhibiting effect on influenza virus with the MIC of 10 mg/mL,which was weaker than ribavirin.The results of animal experiment showed that the body-weight(BW) and pulmonary index of infected model group decreased evidently compared with those of the normal group,TCM-ES groups at the dosages of 750 mg/kg and 1500 mg/kg could reverse the decrease of BW and lung index as compared with the infected models,the difference being insignificant as compared with the normal group.Moreover,TCM-ES also increased the death-protection rate and life-prolongation rate of mice in a dose-dependent manner.TCM-ES at dosage of 10 mg/mL(MIC and MBC) had an antibacterial effect on staphylococcus,while had no effect on gram-negative bacilli.Conclusion TCM-ES has obvious antivirus effect on influenza virus FM1 strain,and also has certain antibacterial effect on staphylococcus,which is worth of further development and research.