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  1. Article ; Online: Emerging Epigenetic and Posttranslational Mechanisms Controlling Resistance to Glucocorticoids in Acute Lymphoblastic Leukemia.

    Borin, Cristina / Pieters, Tim / Serafin, Valentina / Ntziachristos, Panagiotis

    HemaSphere

    2023  Volume 7, Issue 7, Page(s) e916

    Abstract: Glucocorticoids are extensively used for the treatment of acute lymphoblastic leukemia as they pressure cancer cells to undergo apoptosis. Nevertheless, glucocorticoid partners, modifications, and mechanisms of action are hitherto poorly characterized. ... ...

    Abstract Glucocorticoids are extensively used for the treatment of acute lymphoblastic leukemia as they pressure cancer cells to undergo apoptosis. Nevertheless, glucocorticoid partners, modifications, and mechanisms of action are hitherto poorly characterized. This hampers our understanding of therapy resistance, frequently occurring in leukemia despite the current therapeutic combinations using glucocorticoids in acute lymphoblastic leukemia. In this review, we initially cover the traditional view of glucocorticoid resistance and ways of targeting this resistance. We discuss recent progress in our understanding of chromatin and posttranslational properties of the glucocorticoid receptor that might be proven beneficial in our efforts to understand and target therapy resistance. We discuss emerging roles of pathways and proteins such as the lymphocyte-specific kinase that antagonizes glucocorticoid receptor activation and nuclear translocation. In addition, we provide an overview of ongoing therapeutic approaches that sensitize cells to glucocorticoids including small molecule inhibitors and proteolysis-targeting chimeras.
    Language English
    Publishing date 2023-06-22
    Publishing country United States
    Document type Journal Article ; Review
    ISSN 2572-9241
    ISSN (online) 2572-9241
    DOI 10.1097/HS9.0000000000000916
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Tet2 is a tumor suppressor in the pre-leukemic phase of T-cell acute lymphoblastic leukemia.

    De Coninck, Stien / Roels, Juliette / Lintermans, Beatrice / T'Sas, Sara / Taghon, Tom / Curtis, David J / Pieters, Tim / Goossens, Steven / Van Vlierberghe, Pieter

    Blood advances

    2024  

    Abstract: TET2-mediated DNA demethylation plays a pivotal role in regulating pre-leukemic clonal expansion in acute myeloid leukemia (AML), where TET2 mutations are also linked to AML progression. However, its function in other types of leukemias, including T-cell ...

    Abstract TET2-mediated DNA demethylation plays a pivotal role in regulating pre-leukemic clonal expansion in acute myeloid leukemia (AML), where TET2 mutations are also linked to AML progression. However, its function in other types of leukemias, including T-cell acute lymphoblastic leukemia (T-ALL), remains unclear. Here, we used two different T-ALL mouse models to study the possible tumor suppressor role of Tet2 in pre-leukemic T-ALL. Overexpression of Tet2 resulted in a mild but significant increase in T-ALL latency in the immature CD2-Lmo2tg T-ALL mouse model, but no effect on survival was observed in the mature Lck-Cretg/+ Ptenfl/lf T-ALL mouse model. In contrast to the pre-leukemic thymocytes from CD2-Lmo2tg mice, Lck-Cretg/+ Ptenfl/fl thymi do not display self-renewal suggesting that the anti-leukemic effect of Tet2 occurs mainly in the pre-leukemic phase of T-ALL. In conclusion, we demonstrated that the Tet2 tumor suppressor function is dependent on the differentiation stage of T-ALL and limited to the pre-leukemic phase.
    Language English
    Publishing date 2024-03-27
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2915908-8
    ISSN 2473-9537 ; 2473-9529
    ISSN (online) 2473-9537
    ISSN 2473-9529
    DOI 10.1182/bloodadvances.2023011970
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Myb drives B-cell neoplasms and myeloid malignancies in vivo.

    Pieters, Tim / Almeida, André / T'Sas, Sara / Lemeire, Kelly / Hochepied, Tino / Berx, Geert / Kentsis, Alex / Goossens, Steven / Van Vlierberghe, Pieter

    Blood advances

    2022  Volume 6, Issue 10, Page(s) 2987–2991

    MeSH term(s) Cell Proliferation ; Humans ; Myeloproliferative Disorders ; Neoplasms ; Proto-Oncogene Proteins c-myb
    Chemical Substances Proto-Oncogene Proteins c-myb
    Language English
    Publishing date 2022-01-12
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2915908-8
    ISSN 2473-9537 ; 2473-9529
    ISSN (online) 2473-9537
    ISSN 2473-9529
    DOI 10.1182/bloodadvances.2021005955
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Neural defects caused by total and Wnt1-Cre mediated ablation of p120ctn in mice.

    Pieters, Tim / Sanders, Ellen / Tian, Huiyu / van Hengel, Jolanda / van Roy, Frans

    BMC developmental biology

    2020  Volume 20, Issue 1, Page(s) 17

    Abstract: Background: p120 catenin (p120ctn) is an important component in the cadherin-catenin cell adhesion complex because it stabilizes cadherin-mediated intercellular junctions. Outside these junctions, p120ctn is actively involved in the regulation of small ... ...

    Abstract Background: p120 catenin (p120ctn) is an important component in the cadherin-catenin cell adhesion complex because it stabilizes cadherin-mediated intercellular junctions. Outside these junctions, p120ctn is actively involved in the regulation of small GTPases of the Rho family, in actomyosin dynamics and in transcription regulation. We and others reported that loss of p120ctn in mouse embryos results in an embryonic lethal phenotype, but the exact developmental role of p120ctn during brain formation has not been reported.
    Results: We combined floxed p120ctn mice with Del-Cre or Wnt1-Cre mice to deplete p120ctn from either all cells or specific brain and neural crest cells. Complete loss of p120ctn in mid-gestation embryos resulted in an aberrant morphology, including growth retardation, failure to switch from lordotic to fetal posture, and defective neural tube formation and neurogenesis. By expressing a wild-type p120ctn from the ROSA26 locus in p120ctn-null mouse embryonic stem cells, we could partially rescue neurogenesis. To further investigate the developmental role of p120ctn in neural tube formation, we generated conditional p120ctn
    Conclusions: These results indicate that p120ctn is required for neurogenesis and neurulation. Elimination of p120ctn in cells expressing Wnt1 affects neural tube closure by hampering correct formation of specific adhesion and actomyosin complexes at the apical side of neural folds. Collectively, our results demonstrate the crucial role of p120ctn during brain morphogenesis.
    MeSH term(s) Animals ; Cadherins/genetics ; Cadherins/metabolism ; Catenins/genetics ; Catenins/metabolism ; Cell Adhesion/genetics ; Cell Adhesion/physiology ; Mice ; Mice, Knockout ; RNA, Untranslated/genetics ; RNA, Untranslated/metabolism ; Wnt1 Protein/genetics ; Wnt1 Protein/metabolism ; beta Catenin/genetics ; beta Catenin/metabolism
    Chemical Substances Cadherins ; Catenins ; Gt(ROSA)26Sor non-coding RNA, mouse ; RNA, Untranslated ; Wnt1 Protein ; beta Catenin
    Language English
    Publishing date 2020-08-03
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1471-213X
    ISSN (online) 1471-213X
    DOI 10.1186/s12861-020-00222-4
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Role of cell-cell adhesion complexes in embryonic stem cell biology.

    Pieters, Tim / van Roy, Frans

    Journal of cell science

    2014  Volume 127, Issue Pt 12, Page(s) 2603–2613

    Abstract: Pluripotent embryonic stem cells (ESCs) can self-renew or differentiate into any cell type within an organism. Here, we focus on the roles of cadherins and catenins - their cytoplasmic scaffold proteins - in the fate, maintenance and differentiation of ... ...

    Abstract Pluripotent embryonic stem cells (ESCs) can self-renew or differentiate into any cell type within an organism. Here, we focus on the roles of cadherins and catenins - their cytoplasmic scaffold proteins - in the fate, maintenance and differentiation of mammalian ESCs. E-cadherin is a master stem cell regulator that is required for both mouse ESC (mESC) maintenance and differentiation. E-cadherin interacts with key components of the naive stemness pathway and ablating it prevents stem cells from forming well-differentiated teratomas or contributing to chimeric animals. In addition, depleting E-cadherin converts naive mouse ESCs into primed epiblast-like stem cells (EpiSCs). In line with this, a mesenchymal-to-epithelial transition (MET) occurs during reprogramming of somatic cells towards induced pluripotent stem cells (iPSCs), leading to downregulation of N-cadherin and acquisition of high E-cadherin levels. β-catenin exerts a dual function; it acts in cadherin-based adhesion and in WNT signaling and, although WNT signaling is important for stemness, the adhesive function of β-catenin might be crucial for maintaining the naive state of stem cells. In addition, evidence is rising that other junctional proteins are also important in ESC biology. Thus, precisely regulated levels and activities of several junctional proteins, in particular E-cadherin, safeguard naive pluripotency and are a prerequisite for complete somatic cell reprogramming.
    MeSH term(s) Animals ; Catenins/physiology ; Cell Adhesion ; Cell Adhesion Molecules/metabolism ; Cell Differentiation ; Cell Proliferation ; Embryonic Stem Cells/physiology ; Humans ; Intercellular Junctions/physiology
    Chemical Substances Catenins ; Cell Adhesion Molecules
    Language English
    Publishing date 2014-06-15
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 2993-2
    ISSN 1477-9137 ; 0021-9533
    ISSN (online) 1477-9137
    ISSN 0021-9533
    DOI 10.1242/jcs.146720
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Mutations in the histone methyltransferase Ezh2 drive context-dependent leukemia in Xenopus tropicalis.

    Tulkens, Dieter / Boelens, Marthe / Naert, Thomas / Carron, Marjolein / Demuynck, Suzan / Dewaele, Sylviane / Van Isterdael, Gert / Creytens, David / Pieters, Tim / Goossens, Steven / Van Vlierberghe, Pieter / Vleminckx, Kris

    Leukemia

    2023  Volume 37, Issue 12, Page(s) 2404–2413

    Abstract: CRISPR-mediated simultaneous targeting of candidate tumor suppressor genes in Xenopus tropicalis allows fast functional assessment of co-driver genes for various solid tumors. Genotyping of tumors that emerge in the mosaic mutant animals rapidly exposes ... ...

    Abstract CRISPR-mediated simultaneous targeting of candidate tumor suppressor genes in Xenopus tropicalis allows fast functional assessment of co-driver genes for various solid tumors. Genotyping of tumors that emerge in the mosaic mutant animals rapidly exposes the gene mutations under positive selection for tumor establishment. However, applying this simple approach to the blood lineage has not been attempted. Multiple hematologic malignancies have mutations in EZH2, encoding the catalytic subunit of the Polycomb Repressive Complex 2. Interestingly, EZH2 can act as an oncogene or a tumor suppressor, depending on cellular context and disease stage. We show here that mosaic CRISPR/Cas9 mediated ezh2 disruption in the blood lineage resulted in early and penetrant acute myeloid leukemia (AML) induction. While animals were co-targeted with an sgRNA that induces notch1 gain-of-function mutations, sequencing of leukemias revealed positive selection towards biallelic ezh2 mutations regardless of notch1 mutational status. Co-targeting dnm2, recurrently mutated in T/ETP-ALL, induced a switch from myeloid towards acute T-cell leukemia. Both myeloid and T-cell leukemias engrafted in immunocompromised hosts. These data underline the potential of Xenopus tropicalis for modeling human leukemia, where mosaic gene disruption, combined with deep amplicon sequencing of the targeted genomic regions, can rapidly and efficiently expose co-operating driver gene mutations.
    MeSH term(s) Animals ; Humans ; Histone Methyltransferases/genetics ; Xenopus/genetics ; RNA, Guide, CRISPR-Cas Systems ; Enhancer of Zeste Homolog 2 Protein/genetics ; Mutation ; Leukemia, Myeloid, Acute
    Chemical Substances Histone Methyltransferases (EC 2.1.1.-) ; RNA, Guide, CRISPR-Cas Systems ; Enhancer of Zeste Homolog 2 Protein (EC 2.1.1.43)
    Language English
    Publishing date 2023-10-04
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 807030-1
    ISSN 1476-5551 ; 0887-6924
    ISSN (online) 1476-5551
    ISSN 0887-6924
    DOI 10.1038/s41375-023-02052-2
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Targeting hyperactive platelet-derived growth factor receptor-β signaling in T-cell acute lymphoblastic leukemia and lymphoma.

    De Coninck, Stien / De Smedt, Renate / Lintermans, Beatrice / Reunes, Lindy / Kosasih, Hansen J / Reekmans, Alexandra / Brown, Lauren M / Van Roy, Nadine / Palhais, Bruno / Roels, Juliette / Van der Linden, Malaika / Van Dorpe, Jo / Ntziachristos, Panagiotis / Van Delft, Frederik W / Mansour, Marc R / Pieters, Tim / Lammens, Tim / De Moerloose, Barbara / De Bock, Charles E /
    Goossens, Steven / Van Vlierberghe, Pieter

    Haematologica

    2024  Volume 109, Issue 5, Page(s) 1373–1384

    Abstract: T-cell acute lymphoblastic leukemia (T-ALL) and T-cell lymphoblastic lymphoma (T-LBL) are rare aggressive hematologic malignancies. Current treatment consists of intensive chemotherapy leading to 80% overall survival but is associated with severe toxic ... ...

    Abstract T-cell acute lymphoblastic leukemia (T-ALL) and T-cell lymphoblastic lymphoma (T-LBL) are rare aggressive hematologic malignancies. Current treatment consists of intensive chemotherapy leading to 80% overall survival but is associated with severe toxic side effects. Furthermore, 10-20% of patients still die from relapsed or refractory disease providing a strong rationale for more specific, targeted therapeutic strategies with less toxicities. Here, we report a novel MYH9::PDGFRB fusion in a T-LBL patient, and demonstrate that this fusion product is constitutively active and sufficient to drive oncogenic transformation in vitro and in vivo. Expanding our analysis more broadly across T-ALL, we found a T-ALL cell line and multiple patient-derived xenograft models with PDGFRB hyperactivation in the absence of a fusion, with high PDGFRB expression in TLX3 and HOXA T-ALL molecular subtypes. To target this PDGFRB hyperactivation, we evaluated the therapeutic effects of a selective PDGFRB inhibitor, CP-673451, both in vitro and in vivo and demonstrated sensitivity if the receptor is hyperactivated. Altogether, our work reveals that hyperactivation of PDGFRB is an oncogenic driver in T-ALL/T-LBL, and that screening T-ALL/T-LBL patients for phosphorylated PDGFRB levels can serve as a biomarker for PDGFRB inhibition as a novel targeted therapeutic strategy in their treatment regimen.
    MeSH term(s) Humans ; Receptor, Platelet-Derived Growth Factor beta/genetics ; Receptor, Platelet-Derived Growth Factor beta/metabolism ; Receptor, Platelet-Derived Growth Factor beta/antagonists & inhibitors ; Precursor T-Cell Lymphoblastic Leukemia-Lymphoma/drug therapy ; Precursor T-Cell Lymphoblastic Leukemia-Lymphoma/metabolism ; Precursor T-Cell Lymphoblastic Leukemia-Lymphoma/genetics ; Precursor T-Cell Lymphoblastic Leukemia-Lymphoma/pathology ; Animals ; Mice ; Signal Transduction/drug effects ; Xenograft Model Antitumor Assays ; Cell Line, Tumor ; Oncogene Proteins, Fusion/genetics ; Oncogene Proteins, Fusion/metabolism ; Myosin Heavy Chains/genetics ; Myosin Heavy Chains/metabolism ; Molecular Targeted Therapy ; Protein Kinase Inhibitors/pharmacology ; Protein Kinase Inhibitors/therapeutic use ; Disease Models, Animal
    Chemical Substances Receptor, Platelet-Derived Growth Factor beta (EC 2.7.10.1) ; PDGFRB protein, human (EC 2.7.10.1) ; Oncogene Proteins, Fusion ; MYH9 protein, human ; Myosin Heavy Chains (EC 3.6.4.1) ; Protein Kinase Inhibitors
    Language English
    Publishing date 2024-05-01
    Publishing country Italy
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, N.I.H., Extramural
    ZDB-ID 2333-4
    ISSN 1592-8721 ; 0017-6567 ; 0390-6078
    ISSN (online) 1592-8721
    ISSN 0017-6567 ; 0390-6078
    DOI 10.3324/haematol.2023.283981
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Dual targeting of MAPK and PI3K pathways unlocks redifferentiation of Braf-mutated thyroid cancer organoids.

    Lasolle, Hélène / Schiavo, Andrea / Tourneur, Adrien / Gillotay, Pierre / de Faria da Fonseca, Bárbara / Ceolin, Lucieli / Monestier, Olivier / Aganahi, Benilda / Chomette, Laura / Kizys, Marina Malta Letro / Haenebalcke, Lieven / Pieters, Tim / Goossens, Steven / Haigh, Jody / Detours, Vincent / Maia, Ana Luiza Silva / Costagliola, Sabine / Romitti, Mírian

    Oncogene

    2023  Volume 43, Issue 3, Page(s) 155–170

    Abstract: Thyroid cancer is the most common endocrine malignancy and several genetic events have been described to promote the development of thyroid carcinogenesis. Besides the effects of specific mutations on thyroid cancer development, the molecular mechanisms ... ...

    Abstract Thyroid cancer is the most common endocrine malignancy and several genetic events have been described to promote the development of thyroid carcinogenesis. Besides the effects of specific mutations on thyroid cancer development, the molecular mechanisms controlling tumorigenesis, tumor behavior, and drug resistance are still largely unknown. Cancer organoids have been proposed as a powerful tool to study aspects related to tumor development and progression and appear promising to test individual responses to therapies. Here, using mESC-derived thyroid organoids, we developed a Braf
    MeSH term(s) Animals ; Mice ; Carcinogenesis ; Mutation ; Organoids/pathology ; Phosphatidylinositol 3-Kinases/genetics ; Proto-Oncogene Proteins B-raf ; Thyroid Cancer, Papillary/pathology ; Thyroid Neoplasms/drug therapy ; Thyroid Neoplasms/genetics ; Thyroid Neoplasms/pathology
    Chemical Substances Phosphatidylinositol 3-Kinases (EC 2.7.1.-) ; Proto-Oncogene Proteins B-raf (EC 2.7.11.1) ; Braf protein, mouse (EC 2.7.11.1)
    Language English
    Publishing date 2023-11-20
    Publishing country England
    Document type Journal Article
    ZDB-ID 639046-8
    ISSN 1476-5594 ; 0950-9232
    ISSN (online) 1476-5594
    ISSN 0950-9232
    DOI 10.1038/s41388-023-02889-y
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Direct and indirect anti-leukemic properties of activity-on-target interferons for the treatment of T-cell acute lymphoblastic leukemia.

    Goossens, Steven / Cauwels, Anje / Pieters, Tim / De Smedt, Renate / T'Sas, Sara / Almeida, André / Daneels, Willem / Van Vlierberghe, Pieter / Tavernier, Jan

    Haematologica

    2022  Volume 107, Issue 6, Page(s) 1448–1453

    MeSH term(s) Humans ; Interferons ; Precursor T-Cell Lymphoblastic Leukemia-Lymphoma/drug therapy ; T-Lymphocytes
    Chemical Substances Interferons (9008-11-1)
    Language English
    Publishing date 2022-06-01
    Publishing country Italy
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2333-4
    ISSN 1592-8721 ; 0017-6567 ; 0390-6078
    ISSN (online) 1592-8721
    ISSN 0017-6567 ; 0390-6078
    DOI 10.3324/haematol.2021.278913
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Myb

    Almeida, André / T'Sas, Sara / Pagliaro, Luca / Fijalkowski, Igor / Sleeckx, Wouter / Van Steenberge, Hannah / Zamponi, Raffaella / Lintermans, Béatrice / Van Loocke, Wouter / Palhais, Bruno / Reekmans, Alexandra / Bardelli, Valentina / Demoen, Lisa / Reunes, Lindy / Deforce, Dieter / Van Nieuwerburgh, Filip / Kentsis, Alex / Ntziachristos, Panagiotis / Van Roy, Nadine /
    De Moerloose, Barbara / Mecucci, Cristina / La Starza, Roberta / Roti, Giovanni / Goossens, Steven / Van Vlierberghe, Pieter / Pieters, Tim

    HemaSphere

    2024  Volume 8, Issue 3, Page(s) e51

    Abstract: T-lineage acute lymphoblastic leukemia (T-ALL) is an aggressive hematological malignancy that accounts for 10%-15% of pediatric and 25% of adult ALL cases. Although the prognosis of T-ALL has improved over time, the outcome of T-ALL patients with primary ...

    Abstract T-lineage acute lymphoblastic leukemia (T-ALL) is an aggressive hematological malignancy that accounts for 10%-15% of pediatric and 25% of adult ALL cases. Although the prognosis of T-ALL has improved over time, the outcome of T-ALL patients with primary resistant or relapsed leukemia remains poor. Therefore, further progress in the treatment of T-ALL requires a better understanding of its biology and the development of more effective precision oncologic therapies. The proto-oncogene
    Language English
    Publishing date 2024-03-10
    Publishing country United States
    Document type Journal Article
    ISSN 2572-9241
    ISSN (online) 2572-9241
    DOI 10.1002/hem3.51
    Database MEDical Literature Analysis and Retrieval System OnLINE

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