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Title: Dual mechanisms of 9-beta-D-arabinofuranosylguanine resistance in CEM T-lymphoblast leukemia cells
Authors: Curbo, S ×
Zhu, C
Johansson, M
Balzarini, Jan
Karlsson, A #
Issue Date: 27-Jul-2001
Series Title: Biochemical and Biophysical Research Communications vol:285 issue:1 pages:40-5
Abstract: The guanine nucleoside analog araG is selectively toxic to T-lymphoblasts and has recently shown promise in treatment of lymphoid malignancies of T-cell origin. The molecular mechanism of this tissue-selective cytotoxicity is, however, yet unclear. AraG is phosphorylated, and thereby pharmacologically activated, by the mitochondrial deoxguanosine kinase and the cytosolic/nuclear deoxycytidine kinase. We have recently shown that araG is predominantly incorporated into mitochondrial DNA of cancer cell lines, which suggests a role of mitochondria as its pharmacological target. In the present study, we have generated araG-resistant CEM T-lymphoblast cell lines and show that araG resistance may occur by two separate molecular mechanisms that can occur sequentially. The first mechanism is associated with a decrease of araG incorporation into mitochondrial DNA, and the second event is associated with loss of dCK activity.
URI: 
ISSN: 0006-291X
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Laboratory of Virology and Chemotherapy (Rega Institute)
× corresponding author
# (joint) last author

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