Mode of inactivation of arenaviruses by disulfide-based compounds

• Published in: Antiviral research 2002-09, Vol.55 (3), p.437-446
• Main Authors: Garcı́a, C.C, Candurra, N.A, Damonte, E.B
• Format: Article
• Language: English
• Subjects: Animals; Antibiotics. Antiinfectious agents. Antiparasitic agents; Antiviral; Antiviral agents; Antiviral Agents - chemistry; Antiviral Agents - pharmacology; Arenaviruses; Arenaviruses, New World - drug effects; Biological and medical sciences; Cercopithecus aethiops; Disulfides; Disulfides - chemistry; Disulfides - pharmacology; Junin virus; Junin virus - drug effects; Junin virus - growth & development; Medical sciences; Pharmacology. Drug treatments; Tacaribe virus; Vero Cells; Viral Proteins - metabolism; Virion - drug effects; Virus inactivation; Virus Replication - drug effects
• ISSN: 0166-3542; 1872-9096
• DOI: 10.1016/S0166-3542(02)00076-1

Several disulfide-based compounds, including intermolecular aromatic disulfides of the type Ph-S-S-Ph and dithianes with the sulfur atoms tethered in a ring structure, have shown effective inhibitory activity against the arenaviruses Junin (JUNV), agent of Argentine hemorrhagic fever, and Tacaribe (TCRV). These compounds showed a strong virucidal effect with inactivating concentration 50% (IC 50) values in the range 0.6–5.0 μM, and also were effective to reduce virus yields from infected cells. The mode of inactivating action of two active compounds, the aromatic bis disulfide NSC20625 and the dithiane NSC624152, was further studied. Both compounds were able to inactivate arenaviruses after a few minutes of direct contact with virions, in a concentration- and time-dependent manner. The ability of drug-treated virus to perform several steps of the replication cycle was analyzed. The killed virus particles were found to bind and enter to Vero cells with the same efficacy as infectious native virions, but the ability of inactivated virions to synthesize viral proteins in Vero cells was abolished. Thus, treatment of JUNV and TCRV with these compounds destroyed virion infectivity, generating particles which entered the host cell but were unable to complete the viral biosynthetic processes.