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© A-M. Pais-Correia, M-I. Thoulouze, A. Alcover, A. Gessain
Mise en évidence de structures de type "biofilm ", formées par le rétrovirus HTLV-1 générés par des cellules infectées (cellules du haut), qui ont été transmis à un autre lymphocyte (cellule du bas). Micrographie en microscopie électronique à balayage. Image colorisée.
Publication : Antiviral research

The efficacy of combined therapy of arsenic trioxide and alpha interferon in human T-cell leukemia virus type-1-infected squirrel monkeys (Saimiri sciureus)

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Antiviral research - 28 Feb 2006

Heraud JM, Mortreux F, Merien F, Contamin H, Mahieux R, Pouliquen JF, Wattel E, Gessain A, de Thé H, Bazarbachi A, Hermine O, Kazanji M

Link to Pubmed [PMID] – 16540180

Antiviral Res. 2006 Jul;70(3):132-9

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.