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Antimicrobial Agents and Chemotherapy, May 2003, p. 1756-1759, Vol. 47, No. 5
0066-4804/03/$08.00+0     DOI: 10.1128/AAC.47.5.1756-1759.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Susceptibilities of Simian Immunodeficiency Virus to Protease Inhibitors

Angelica C. Giuffre,1 Joanne Higgins,1 Robert W. Buckheit Jr.,2,{dagger} and Thomas W. North1,3*

Center for Comparative Medicine,1 Department of Veterinary Molecular Biosciences, University of California, Davis, Davis, California 95616,3 Southern Research Institute, Fredrick, Maryland 217012

Received 29 August 2002/ Returned for modification 18 November 2002/ Accepted 11 February 2003

We used a focal infectivity assay with HeLa H1-JC.37 cells to directly compare susceptibilities of simian immunodeficiency virus (SIV) and human immunodeficiency virus type 1 (HIV-1) to protease inhibitors. SIVmac239 was inhibited by indinavir, saquinavir, and ritonavir, with 50% effective concentrations (means ± standard deviations) of 39 ± 8, 55 ± 3, and 13 ± 5 nM, respectively. The corresponding values for inhibition of HIV-1 were 66 ± 4, 47 ± 10, and 25 ± 14 nM, respectively.

* Corresponding author. Mailing address: Center for Comparative Medicine, University of California, Davis, Davis CA 95616. Phone: (530) 752-3414. Fax: (530) 752-7914. E-mail: twnorth{at}ucdavis.edu.

{dagger} Present address: Infectious Disease, Cancer and Immunology Research Department, TherImmune Research Corporation, Gaithersburg, MD 20879.

Antimicrobial Agents and Chemotherapy, May 2003, p. 1756-1759, Vol. 47, No. 5
0066-4804/03/$08.00+0     DOI: 10.1128/AAC.47.5.1756-1759.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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