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Blood. 2017 Dec 28;130(26):2860-2871. doi: 10.1182/blood-2017-08-801019. Epub 2017 Nov 14.

Immature CML cells implement a BMP autocrine loop to escape TKI treatment.

Grockowiak E1,2,3,4, Laperrousaz B1,2,3,4,5, Jeanpierre S1,2,3,4,6, Voeltzel T1,2,3,4, Guyot B1,2,3,4, Gobert S1,2,3,4, Nicolini FE1,2,3,4,6,7,8, Maguer-Satta V1,2,3,4,8.

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Centre National de la Recherche Scientifique (CNRS) Unité Mixte de Recherche (UMR) and.
INSERM Unité 1052, Centre de Recherche en Cancérologie de Lyon (CRCL), Lyon, France.
Université de Lyon, Lyon, France.
Department of Signaling of Tumor Escape, CRCL, Lyon, France.
CNRS UMR 5672, Ecole Normale Supérieure de Lyon, Lyon, France.
Centre Léon Bérard, Lyon, France.
Hematology Department, Centre Hospitalier Lyon Sud, Hospices Civils de Lyon, Pierre-Bénite, France; and.
French Group of Chronic Myeloid Leukemia (CML) (Fi-LMC), Institut Bergonié, Bordeaux, France.


The BCR-ABL specific tyrosine kinase inhibitors (TKI) changed the outcome of chronic myeloid leukemia (CML), turning a life-threatening disease into a chronic illness. However, TKI are not yet curative, because most patients retain leukemic stem cells (LSC) and their progenitors in bone marrow and relapse following treatment cessation. At diagnosis, deregulation of the bone morphogenetic protein (BMP) pathway is involved in LSC and progenitor expansion. Here, we report that BMP pathway alterations persist in TKI-resistant patients. In comparison with patients in complete cytogenetic remission, TKI-resistant LSC and progenitors display high levels of BMPR1b expression and alterations of its cellular localization. In vitro treatment of immature chronic phase CML cells with TKI alone, or in combination with interferon-α, results in the preferential survival of BMPR1b+ cells. We demonstrated persistent and increasing BMP4 production by patients' mesenchymal cells with resistance. Patient follow-up revealed an increase of BMPR1b expression and in BMP4 expression in LSC from TKI-resistant patients in comparison with diagnosis, while remaining unchanged in sensitive patients. Both leukemic and nonleukemic cells exhibit higher BMP4 levels in the bone marrow of TKI-resistant patients. Exposure to BMP2/BMP4 does not alter BCR-ABL transcript expression but is accompanied by the overexpression of TWIST-1, a transcription factor highly expressed in resistant LSC. By modulating BMP4 or BMPR1b expression, we show that these elements are involved in TKI resistance. In summary, we reveal that persistence of BMP alterations and existence of an autocrine loop promote CML-primitive cells' TKI resistance.

[Indexed for MEDLINE]

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