Ursolic acid: A novel antiviral compound inhibiting rotavirus infection in vitro

Area of Science:

• Virology
• Natural Product Chemistry
• Drug Discovery

Background:

• Rotavirus is a primary cause of severe gastroenteritis in young children, particularly in developing nations.
• Current treatments for rotavirus are limited, highlighting the urgent need for effective antiviral therapies.
• Ursolic acid, a naturally occurring triterpenoid, possesses known antiviral properties.

Purpose of the Study:

• To investigate the potential of ursolic acid as an antirotaviral agent.
• To assess the virucidal and cytotoxic effects of ursolic acid.
• To evaluate the impact of ursolic acid on rotavirus replication and maturation in vitro.

Main Methods:

• Analysis of ursolic acid's virucidal effect on rotavirus particles.
• Assessment of ursolic acid's cytotoxicity on cultured cells.
• In vitro evaluation of ursolic acid's efficacy against rotavirus infection, including viral titre, protein levels, and viroplasm formation.

Main Results:

• Ursolic acid demonstrated no virucidal effect at concentrations up to 40 µM.
• Cytotoxicity was observed starting at 20 µM ursolic acid.
• At 10 µM, ursolic acid significantly inhibited rotavirus replication, reduced viral titre, affected viral protein levels (VP6, NSP2), and disrupted viral particle maturation and viroplasm formation.

Conclusions:

• Ursolic acid exhibits significant in vitro antiviral activity against rotavirus.
• The compound interferes with early and late stages of the rotavirus replication cycle.
• Ursolic acid represents a potential candidate for developing novel therapeutic strategies against rotavirus infections.