Journal
JAIDS-JOURNAL OF ACQUIRED IMMUNE DEFICIENCY SYNDROMES
Volume 36, Issue 4, Pages 900-914Publisher
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/00126334-200408010-00003
Keywords
tenofovir; PMPA; simian immunodeficiency virus; macaque; survival; AIDS
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Funding
- NIAID NIH HHS [R01 AI46320-01] Funding Source: Medline
- NIDCR NIH HHS [DE12926] Funding Source: Medline
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Previous studies have demonstrated that tenofovir (9[2-(phosphonomethoxy)propyl] adenine; PMPA) treatment is usually very effective in suppressing viremia in macaques infected with simian immunodeficiency virus (SIV). The present study focuses on a subset of infant macaques that were chronically infected with highly virulent SIVmac251, and for which prolonged tenofovir treatment failed to significantly suppress viral RNA levels in plasma despite the presence of tenofovir-susceptible virus at the onset of therapy. While untreated animals with similarly high viremia developed fatal immunodeficiency within 3-6 months, these tenofovir-treated animals had significantly improved survival (up to 3.5 years). This clinical benefit occurred even in animals for which tenofovir had little or no effect on CD4(+) and CD8(+) lymphocyte counts and antibody responses to SIV and test antigens. Thus, the clinical benefits of tenofovir were larger than predicted by plasma viral RNA levels and other routine laboratory parameters.
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