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Myelodysplastic syndrome

RETRACTED ARTICLE: LAMP2 expression dictates azacytidine response and prognosis in MDS/AML

Leukemia volume 33, pages 1501–1513 (2019)Cite this article

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A Retraction to this article was published on 14 July 2020

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Abstract

Chaperone-mediated autophagy (CMA) is a highly selective form of autophagy. During CMA, the HSC70 chaperone carries target proteins endowed with a KFERQ-like motif to the lysosomal receptor LAMP2A, which then translocate them into lysosomes for degradation. In the present study, we scrutinized the mechanisms underlying the response and resistance to Azacytidine (Aza) in MDS/AML cell lines and bone marrow CD34+ blasts from MDS/AML patients. In engineered Aza-resistant MDS cell lines and some AML cell lines, we identified a profound defect in CMA linked to the absence of LAMP2A. LAMP2 deficiency was responsible for Aza resistance and hypersensitivity to lysosome and autophagy inhibitors. Accordingly, gain of function of LAMP2 in deficient cells or loss of function in LAMP2-expressing cells rendered them sensitive or resistant to Aza, respectively. A strict correlation was observed between the absence of LAMP2, resistance to Aza and sensitivity to lysosome inhibitors. Low levels of LAMP2 expression in CD34+ blasts from MDS/AML patients correlated with lack of sensitivity to Aza and were predictive of poor overall survival. We propose that CD34+/LAMP2Low patients at diagnosis or who become CD34+/LAMP2Low during the course of treatment with Aza might benefit from a lysosome inhibitor already used in the clinic.

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Data availability

All results and datas presented in this article are available in main or supplemental figures. Characteristics of patients presented in Fig. 6a are available in Table 1. Patients DATA sets relative to Fig. 6c, Sup. Figure 13C and D are available on the Cbioportal website (TCGA NEJM 2013).

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Acknowledgements

This work was supported by INSERM, INCA (PRTK-045, 2013–2015), the Fondation ARC pour la Recherche contre le Cancer (Equipe labellisée 2014–2017 and 2018–2020) and the Association Laurette Fugain (ALF 2016/08). This work was also funded by the French government (National Research Agency, ANR) through the “investissement for the future” LABEX SIGNALIFE program reference #ANR-11-LABEX-0028-01. AD is the recipient of a fellowship from the Fondation pour la Recherche Médicale. SB is the recipient of a fellowship from the Fondation ARC. MZ is the recipient of a fellowship from the LABEX SIGNALIFE program. AP is supported by the ATIP-AVENIR research grant and by the St Louis Association for leukemia research. Finally, this work was also supported by the Conseil General des Alpes Maritimes and the Conseil Regional PACA & Corse. The authors greatly acknowledge the C3M Imaging Core Facility part of MICA (Microscopy and Imaging Platform Côte d’Azur).

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Author notes

  1. These authors contributed equally: Alix Dubois, Nathan Furstoss, Patrick Auberger, Guillaume Robert

Authors and Affiliations

  1. Université Côte d’Azur, Nice, France

    Alix Dubois, Nathan Furstoss, Anne Calleja, Marwa Zerhouni, Thomas Cluzeau, Coline Savy, Sandrine Marchetti, Mohamed Amine Hamouda, Sonia Boulakirba, François Orange, Sandra Lacas-Gervais, Nicolas Mounier, Frederic Luciano, Arnaud Jacquel, Patrick Auberger & Guillaume Robert

  2. Inserm U1065, C3M, Team: Myeloid Malignancies and Multiple Myeloma, Nice, France

    Alix Dubois, Nathan Furstoss, Anne Calleja, Thomas Cluzeau, Coline Savy, Sandrine Marchetti, Mohamed Amine Hamouda, Sonia Boulakirba, Frederic Luciano, Arnaud Jacquel, Patrick Auberger & Guillaume Robert

  3. Equipe Labellisée par la Fondation ARC, Paris, France

    Alix Dubois, Nathan Furstoss, Marwa Zerhouni, Coline Savy, Sandrine Marchetti, Mohamed Amine Hamouda, Sonia Boulakirba, Frederic Luciano, Arnaud Jacquel, Patrick Auberger & Guillaume Robert

  4. CHU de Nice, Département d’Hématologie Clinique, Nice, France

    Anne Calleja, Thomas Cluzeau, Jean-Michel Karsenti, Nicolas Mounier & Patrick Auberger

  5. Centre Commun de Microscopie Appliquée, Nice, France

    François Orange & Sandra Lacas-Gervais

  6. Institut Cochin, CNRS, UMR 8104, INSERM U1016, Université Paris Descartes, Paris, France

    Jérôme Tamburini

  7. Inserm U944, Institut Universitaire d’Hématologie, Hôpital St Louis, Paris, France

    Alexandre Puissant

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Dubois, A., Furstoss, N., Calleja, A. et al. RETRACTED ARTICLE: LAMP2 expression dictates azacytidine response and prognosis in MDS/AML. Leukemia 33, 1501–1513 (2019). https://doi.org/10.1038/s41375-018-0336-1

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