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Looking for the effect of oncogenic BCR-ABL1 on ABCA3 expression, we analysed stably transfected variants with BCR-ABL1 in HEK293 model cells as well as the leukaemic cell lines HL60 and Mo7, and discovered a significant increase in transporter expression (Fig S1a). Surprisingly, however, we also detected elevated ABCA3 transcript abundance in peripheral blood samples from patients in haematological http://www.selleck.cn/products/ON-01910.html complete remission (CR) under imatinib maintenance therapy, as well as �C at lower levels �C patients with GIST under imatinib maintenance therapy (Fig?2A). Seeking the source of these ABCA3 transcripts, we first measured transcript levels in BCR-ABL1 positive leukaemia cell lines, and identified a dose-dependent induction of ABCA3 transcription by imatinib, dasatinib, and nilotinib (Figs?2B and C). Of note, these ABCA3 transcripts originated from the viable cells in the suspension cultures, as confirmed with sorted cell preparations (Figure S1c). We also exposed CD34-positive BCR-ABL1 positive leukaemic cells to 2?��mol/l imatinib, dasatinib, or nilotinib in stroma-supported in vitro culture, and consistently observed induction of ABCA3 expression in these cells (Fig?2D), an effect which we also detected in BCR-ABL1 negative CD34 positive cells as the main source of ABCA3 transcripts in non-transformed bone marrow samples (Figs S2a and b). Notably, the TKI-mediated increase in ABCA3 expression occurred in cultures supported by stroma http://www.selleckchem.com/products/abc294640.html cell micromilieu, indicating that this regulation is effective under conditions mimicking the bone marrow niche. Thus, BCR-ABL1 expression is associated with increased ABCA3 expression, and targeting BCR-ABL1 with TKI enhances transporter expression in leukaemic and non-transformed haematopoietic stem cells, increasing the detoxification effects mediated by this transporter. http://www.selleckchem.com/products/loxo-101.html Given the induction of TKI-mediated ABCA3 expression and its consequences for leukaemia cell resistance to TKI-based therapy, we focused on the regulation of ABCA3 expression. Jeong et?al (2011) recently documented binding of the transcription factor SALL4 to the ABCA3 promoter, resulting in increased ABCA3 expression and resistance to anthracyclins in AML. Therefore, we evaluated the transcript levels of SALL4 and ABCA3 in a cohort of patients with untreated CML. The abundances of ABCA3 transcript correlated significantly with the transcript abundances of SALL4 in this cohort (r?=?0��9222, P?