1887

Abstract

Summary

-methyl and -ethyl isatin beta-thiosemicarbazones inactivate cell-free Parana and Pichinde viruses as well as three strains of lymphocytic choriomeningitis virus. This antiviral activity is abolished in the presence of the chelating agent EDTA. The rate of virus inactivation by -methyl isatin beta-thiosemicarbazone is greatly enhanced and controlled by the addition of cupric sulphate. Divalent cations of other first transition series metals are less effective. A difference exists in the copper requirement for fast inactivation of the prototype arenavirus (lymphocytic choriomeningitis) and the Tacaribe Complex of viruses (Parana and Pichinde). In the presence of 20 µ--methyl isatin beta-thiosemicarbazone, LCM and Pichinde viruses can be inactivated at about the same rate if 20 µ-CuSO is added to the former and 160 µ-CuSO is added to the latter. Using 20 µ--methyl isatin beta-thiosemicarbazone and CuSO the inactivation of LCM is reduced, but not eliminated, in the presence of an equal amount of infectious Pichinde virus. Crude and highly purified Pichinde virus are inactivated at the same rate when exposed to identical concentrations of -methyl isatin beta-thiosemicarbazone and cupric sulphate. There is little detectable change in inactivation rates when Pichinde or LCM viruses are grown in a variety of different cell lines.

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1975-09-01
2022-01-27
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