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Antimicrobial Agents and Chemotherapy, December 2004, p. 4680-4686, Vol. 48, No. 12
0066-4804/04/$08.00+0     DOI: 10.1128/AAC.48.12.4680-4686.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

TMC125, a Novel Next-Generation Nonnucleoside Reverse Transcriptase Inhibitor Active against Nonnucleoside Reverse Transcriptase Inhibitor-Resistant Human Immunodeficiency Virus Type 1

Koen Andries,1 Hilde Azijn,2 Theo Thielemans,1 Donald Ludovici,3 Michael Kukla,3 Jan Heeres,4 Paul Janssen,4 Bart De Corte,3 Johan Vingerhoets,2 Rudi Pauwels,2 and Marie-Pierre de Béthune2*

Johnson & Johnson Pharmaceutical Research and Development, Beerse,1 Tibotec, Mechelen,2 Johnson & Johnson Pharmaceutical Research and Development, Vosselaar, Belgium,4 Johnson & Johnson Pharmaceutical Research and Development, Spring House, Pennsylvania3

Received 9 April 2004/ Returned for modification 27 May 2004/ Accepted 5 August 2004

Nonnucleoside reverse transcriptase inhibitors (NNRTIs) are potent inhibitors of human immunodeficiency virus type 1 (HIV-1); however, currently marketed NNRTIs rapidly select resistant virus, and cross-resistance within the class is extensive. A parallel screening strategy was applied to test candidates from a series of diarylpyrimidines against wild-type and resistant HIV strains carrying clinically relevant mutations. Serum protein binding and metabolic stability were addressed early in the selection process. The emerging clinical candidate, TMC125, was highly active against wild-type HIV-1 (50% effective concentration [EC50] = 1.4 to 4.8 nM) and showed some activity against HIV-2 (EC50 = 3.5 µM). TMC125 also inhibited a series of HIV-1 group M subtypes and circulating recombinant forms and a group O virus. Incubation of TMC125 with human liver microsomal fractions suggested good metabolic stability (15% decrease in drug concentration and 7% decrease in antiviral activity after 120 min). Although TMC125 is highly protein bound, its antiviral effect was not reduced by the presence of 45 mg of human serum albumin/ml, 1 mg of {alpha}1-acid glycoprotein/ml, or 50% human serum. In an initial screen for activity against a panel of 25 viruses carrying single and double reverse transcriptase amino acid substitutions associated with NNRTI resistance, the EC50 of TMC125 was <5 nM for 19 viruses, including the double mutants K101E+K103N and K103N+Y181C. TMC125 also retained activity (EC50 < 100 nM) against 97% of 1,081 recent clinically derived recombinant viruses resistant to at least one of the currently marketed NNRTIs. TMC125 is a potent next generation NNRTI, with the potential for use in individuals infected with NNRTI-resistant virus.

* Corresponding author. Mailing address: Tibotec BVBA, Gen de Wittelaan L 11B 3, 2800 Mechelen, Belgium. Phone: 32-15-401-240. Fax: 32-15-286-347. E-mail: mdbethun{at}tibbe.jnj.com.

Antimicrobial Agents and Chemotherapy, December 2004, p. 4680-4686, Vol. 48, No. 12
0066-4804/04/$08.00+0     DOI: 10.1128/AAC.48.12.4680-4686.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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