Related Experiment Videos
Benzimidazole derivatives: new enhancers of influenza virus multiplication
Abstract:
The enhancing activity of 5-methyl-2-D-ribobenzimidazole on influenza B (Lee) virus yield in chorioallantoic membranes from 10-day old embryonated eggs was compared with that of eight other polyhydroxyalkyl-benzimidazoles. No marked differences in activity were noted with the following six derivatives: 5,6-dimethyl-2-D-ribo; 2-D-gluco; 5-methyl-2-D-gluco; 5,6-dimethyl-2-D-gluco; 5-methyl-2-D-galacto; and 5-methyl-2-L-rhamno. None caused morphological damage to the membranes at a concentration of 3.5 mM. The solubility of the 5-methyl-2-D-arabo and 5-methyl-2-D-manno derivatives was too low to permit quantitative comparisons, but both were active and nontoxic at a concentration of 1.75 mM. 5-Hydroxy-1-methylbenzimidazole and 5-methoxy-1-methylbenzimidazole are more active than 5-methyl-2-D-ribobenzimidazole both with respect to specific activity and maximal enhancement at the highest tolerated dose. The hydroxyl substituent is superior to the methoxyl grouping. Substitution at position 5 is superior to substitution at position 6 with respect to the tolerated dose level and therefore the maximal effect obtainable, but the 6-hydroxy-1-methyl derivative showed the highest specific activity. 5-Methoxy-1-methylbenzimidazole increases the yield to a comparable extent as measured by infectivity and hemagglutination titrations. The responses of membranes from individual chicken embryos to the enhancing action of 5-methoxy-1-methylbenzimidazole and 5-methyl-2-D-ribobenzimidazole are similar. 5-Methoxy-1-methylbenzimidazole restores the capacity of membranes from older chicken embryos to produce a large amount of virus after a small inoculum. This derivative increases the yield of virus in membranes treated before infection only. Maximal enhancement is obtained with prolonged treatment, starting before, and continuing after infection. 5-Methoxy-1-methyl-benzimidazole increases the yield of virus from COFAL-negative embryos in which the control yield is very low. Combined treatment with moderate doses of 5-methoxy-1-methylbenzimidazole and 5-methyl-2-D-ribobenzimidazole gives an additive effect.
Insights
This study compared benzimidazole derivatives for enhancing influenza B virus yield in embryonated eggs. 5-Methoxy-1-methylbenzimidazole showed superior activity and restored virus production in older embryos.
Area of Science:
- Virology
- Antiviral Research
- Drug Discovery
Background:
- Influenza B virus poses a significant public health threat.
- Developing effective antiviral agents is crucial for managing influenza.
- Benzimidazole derivatives have shown potential in modulating viral replication.
Purpose of the Study:
- To evaluate the antiviral activity of various polyhydroxyalkyl-benzimidazole derivatives.
- To compare the efficacy of 5-methyl-2-D-ribobenzimidazole with other derivatives in enhancing influenza B virus yield.
- To identify the most potent benzimidazole derivative for influenza B virus replication enhancement.
Main Methods:
- Comparative analysis of eight polyhydroxyalkyl-benzimidazole derivatives.
- Testing on chorioallantoic membranes from 10-day-old embryonated chicken eggs.
- Assessment of viral yield through infectivity and hemagglutination titrations.
- Evaluation of cytotoxicity at varying concentrations.
Main Results:
- 5-Methoxy-1-methylbenzimidazole and 5-hydroxy-1-methylbenzimidazole demonstrated higher activity than 5-methyl-2-D-ribobenzimidazole.
- Substitution at position 5 was generally superior to position 6 for tolerated dose and maximal effect.
- 5-Methoxy-1-methylbenzimidazole restored virus production capacity in older embryos and showed an additive effect when combined with 5-methyl-2-D-ribobenzimidazole.
Conclusions:
- 5-Methoxy-1-methylbenzimidazole is a potent enhancer of influenza B virus yield.
- Optimal enhancement is achieved with prolonged treatment, starting before and continuing after infection.
- Benzimidazole derivatives, particularly those with specific substitutions, represent a promising class of compounds for influenza antiviral research.