Abstract:
:Human T-cell lymphotropic virus type 1 (HTLV-1)-associated adult T-cell leukemia/lymphoma (ATLL) has a poor prognosis owing to its intrinsic resistance to chemotherapy. Although zidovudine (AZT) and alpha interferon (IFN-alpha) give rise to some response and improve the prognosis of ATLL, alternative therapies are needed. Arsenic trioxide (As(2)O(3)) has been shown to synergize with IFN-alpha in arresting cell growth and inducing apoptosis of ATLL cells in vitro. In this study, we evaluated the toxicity and the efficacy of this combined treatment in HTLV-1-infected squirrel monkeys (Saimiri sciureus) and HTLV-1 infected cell lines derived therefrom. We first show that treatment with As(2)O(3) and IFN-alpha can induce growth arrest in HTLV-1-transformed monkey T-cell lines in vitro. We then show that treatment of squirrel monkeys with As(2)O(3) in vivo is highly toxic at 0.9 or 0.3mg/day but not at 0.14mg/day for up to 2 weeks. Although the combination of As(2)O(3) and IFN-alpha did not affect significantly the HTLV-1 proviral load in infected monkeys, it reduced the absolute numbers of CD3(+), CD4(+) and CD8(+) cells during treatment, with a significant reduction in the total number of circulating HTLV-1 flower cells in the infected monkeys with chronic ATLL-like disease.
journal_name
Antiviral Resjournal_title
Antiviral researchauthors
Heraud JM,Mortreux F,Merien F,Contamin H,Mahieux R,Pouliquen JF,Wattel E,Gessain A,de Thé H,Bazarbachi A,Hermine O,Kazanji Mdoi
10.1016/j.antiviral.2006.02.003subject
Has Abstractpub_date
2006-07-01 00:00:00pages
132-9issue
3eissn
0166-3542issn
1872-9096pii
S0166-3542(06)00035-0journal_volume
70pub_type
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