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Molecular Mechanisms of Ara-C Signalling: Synergy and Antagonism with Interleukin-3

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Acute Leukemias V

Part of the book series: Haematology and Blood Transfusion / Hämatologie und Bluttransfusion ((HAEMATOLOGY,volume 37))

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Abstract

Cytosine arabinosde (Ara-C) is the most widely used and most effective agent in the treatment of acute myelogenous leukemia [1]. Several lines of evidence have suggested that the efficacy of Ara-C may be enhanced by its combination with hematopoietic growth factors such as Interleukin (IL)-3 or Granulocyte-Macrophage Colony Stimulating Factor (GM-CSF) [2]. IL-3 has been shown by several laboratories to enhance Ara-C incoporation into DNA and Ara-C-mediated tumor cell kill by recruiting resting cells into the cell cycle but also by facilitating intracellular Ara-C metabolism into its active compound, Ara-CTP [3,4]. However, other reports have indicated that IL-3 may also confer resistance of acute myelogenous blasts to subsequent Ara-C [5]. It is thought that Ara-C exerts its cytotoxic effects after incorporation into DNA leading to inhibition of chain elongation [6,7]. In addition, more recent reports have indicated that Ara-C also induces features of apoptotic cell death including DNA fragmentation [8]. Ara-C modulates mRNA expression of several proto-oncogenes, such as c-jun, jun-B or c-myc [3,9,10]. Singaling events initiated by Ara-C, however, are still enigmatic. The present article explores signaling cascades initiated by Ara-C and point to their impact in mediating both synergistic and antagonistic effects of Ara-C and IL-3.

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© 1996 Springer-Verlag Berlin Heidelberg

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Belka, C., Sott, C., Herrmann, F., Brach, M.A. (1996). Molecular Mechanisms of Ara-C Signalling: Synergy and Antagonism with Interleukin-3. In: Hiddemann, W., et al. Acute Leukemias V. Haematology and Blood Transfusion / Hämatologie und Bluttransfusion, vol 37. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-78907-6_22

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  • DOI: https://doi.org/10.1007/978-3-642-78907-6_22

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-78909-0

  • Online ISBN: 978-3-642-78907-6

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