HTLV-1-associated adult T cell leukemia is highly susceptible to Navitoclax due to enhanced Bax expression

Over-expression of Bcl-2, Bcl-xL and Bcl-w is frequently associated with cancer resistance to chemotherapy. Navitoclax (ABT-263), an orally bio-available small-molecule mimetic of the Bcl-2 homology domain 3, specifically inhibits Bcl-2, Bcl-xL and Bcl-w. Despite promising results obtained from the...

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Hauptverfasser: Witzens-Harig, Mathias (VerfasserIn) , Giaisi, Marco (VerfasserIn) , Köhler, Rebecca (VerfasserIn) , Krammer, Peter H. (VerfasserIn) , Li-Weber, Min (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 2016
In: International journal of cancer
Year: 2015, Jahrgang: 138, Heft: 2, Pages: 507-514
ISSN:1097-0215
DOI:10.1002/ijc.29726
Online-Zugang:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1002/ijc.29726
Verlag, lizenzpflichtig, Volltext: https://onlinelibrary.wiley.com/doi/abs/10.1002/ijc.29726
Volltext
Verfasserangaben:Mathias Witzens‐Harig, Marco Giaisi, Rebecca Köhler, Peter H. Krammer and Min Li‐Weber

MARC

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520 |a Over-expression of Bcl-2, Bcl-xL and Bcl-w is frequently associated with cancer resistance to chemotherapy. Navitoclax (ABT-263), an orally bio-available small-molecule mimetic of the Bcl-2 homology domain 3, specifically inhibits Bcl-2, Bcl-xL and Bcl-w. Despite promising results obtained from the clinical trials, the use of Navitoclax in patients is dose-limited due to induction of death of platelets via inhibition of Bcl-xL and subsequent thrombocytopenia. This side effect limits the use of Navitoclax in low doses and to very sensitive tumors. In this study, we show that HTLV-1-associated adult T-cell leukemia/lymphoma (ATL) cells, which over-express Bcl-2, Bcl-xL and Bcl-w, show a 10- to 20-fold higher sensitivity (EC50 = ∼25-50 nM) to Navitoclax compared to non-HTLV-1-associated leukemic cells (EC50 = ∼1 μM). Investigation of the molecular mechanisms revealed that the HTLV-1 oncogenic protein Tax up-regulates expression of the pro-apoptotic protein Bax which enhances the therapeutic efficacy of Navitoclax. In addition, we show that agents that inhibit the transcription elongation or translation initiation such as Wogonin and Roc-A can further decrease the effective dose of Navitoclax. Our study suggests that HTLV-1 ATL may be a good candidate disease for low dose Navitoclax therapy and probably with less risk of thrombocytopenia. 
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