Oncoscience

Modeling the influence of stromal microenvironment in the selection of ENU-induced BCR-ABL1 mutants by tyrosine kinase inhibitors

Djamel Aggoune1, Lucie Tosca2,3,4, Nathalie Sorel1,5, Marie-Laure Bonnet1, Fatima Dkhissi1, Gérard Tachdjian2,3,4, Annelise Bennaceur-Griscelli2,3,6, Jean-Claude Chomel1,5 and Ali G Turhan1,2,3,7

1 INSERM, U935, F-86000 Poitiers, France

2 INSERM, U935, F-94800, Villejuif, France

3 Université Paris–Sud 11, F-94270 Le Kremlin-Bicêtre, France

4 Hôpital Antoine Béclère, Service d’Histologie-Embryologie-Cytogénétique, F-92140 Clamart, France

5 CHU de Poitiers, Service de Cancérologie Biologique, F-86000 Poitiers, France

6 Hôpital Paul Brousse, Service d’Hématologie Biologique, F-94800 Villejuif, France

7 Hôpital Bicêtre, Service d’Hématologie Biologique, F-94270 Le Kremlin Bicêtre, France

Correspondence:

Ali G Turhan, email:

Keywords: ENU-mutagenesis, BCR-ABL1, CML, microenvironment, TKI resistance

Received: December 21, 2013 Accepted: January 20, 2014 Published: January 22, 2014

Abstract

Tyrosine kinase inhibitors (TKIs) have profoundly changed the natural history of chronic myeloid leukemia (CML). However, acquired resistance to imatinib, dasatinib or nilotinib (1st and 2nd generation TKIs), due in part to BCR-ABL1 kinase mutations, has been largely described. These drugs are ineffective on the T315I gatekeeper substitution, which remains sensitive to 3rd generation TKI ponatinib. It has recently been suggested that the hematopoietic niche could protect leukemic cells from targeted therapy. In order to investigate the role of a stromal niche in mutation-related resistance, we developed a niche-based cell mutagenesis assay. For this purpose, ENU (N-ethyl-N-nitrosourea)-exposed UT-7 cells expressing non-mutated or T315I-mutated BCR-ABL1 were cultured with or without murine MS-5 stromal cells and in the presence of imatinib, dasatinib, nilotinib, or ponatinib. In the assays relative to 1st and 2nd generation TKIs, which were performed on non-mutated BCR-ABL1 cells, our data highlighted the increasing efficacy of the latter, but did not reveal any substantial effect of the niche. In ponatinib assays performed on both non-mutated and T315I–mutated BCR-ABL1 cells, an increased number of resistant clones were observed in the presence of MS-5. Present data suggested that T315I mutants need either compound mutations (e.g. E255K/T315I) or a stromal niche to escape from ponatinib. Using array-comparative genomic hybridization experiments, we found an increased number of variations (involving some recurrent chromosome regions) in clones cultured on MS-5 feeder. Overall, our study suggests that the hematopoietic niche could play a crucial role in conferring resistance to ponatinib, by providing survival signals and favoring genetic instability.


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