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The Modes of Dysregulation of the Proto-Oncogene T-Cell Leukemia/Lymphoma 1A. Cancers (Basel) 2021; 13:cancers13215455. [PMID: 34771618 PMCID: PMC8582492 DOI: 10.3390/cancers13215455] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Revised: 10/26/2021] [Accepted: 10/28/2021] [Indexed: 11/19/2022] Open
Abstract
Simple Summary T-cell leukemia/lymphoma 1A (TCL1A) is a proto-oncogene that is mainly expressed in embryonic and fetal tissues, as well as in some lymphatic cells. It is frequently overexpressed in a variety of T- and B-cell lymphomas and in some solid tumors. In chronic lymphocytic leukemia and in T-prolymphocytic leukemia, TCL1A has been implicated in the pathogenesis of these conditions, and high-level TCL1A expression correlates with more aggressive disease characteristics and poorer patient survival. Despite the modes of TCL1A (dys)regulation still being incompletely understood, there are recent advances in understanding its (post)transcriptional regulation. This review summarizes the current concepts of TCL1A’s multi-faceted modes of regulation. Understanding how TCL1A is deregulated and how this can lead to tumor initiation and sustenance can help in future approaches to interfere in its oncogenic actions. Abstract Incomplete biological concepts in lymphoid neoplasms still dictate to a large extent the limited availability of efficient targeted treatments, which entertains the mostly unsatisfactory clinical outcomes. Aberrant expression of the embryonal and lymphatic TCL1 family of oncogenes, i.e., the paradigmatic TCL1A, but also TML1 or MTCP1, is causally implicated in T- and B-lymphocyte transformation. TCL1A also carries prognostic information in these particular T-cell and B-cell tumors. More recently, the TCL1A oncogene has been observed also in epithelial tumors as part of oncofetal stemness signatures. Although the concepts on the modes of TCL1A dysregulation in lymphatic neoplasms and solid tumors are still incomplete, there are recent advances in defining the mechanisms of its (de)regulation. This review presents a comprehensive overview of TCL1A expression in tumors and the current understanding of its (dys)regulation via genomic aberrations, epigenetic modifications, or deregulation of TCL1A-targeting micro RNAs. We also summarize triggers that act through such transcriptional and translational regulation, i.e., altered signals by the tumor microenvironment. A refined mechanistic understanding of these modes of dysregulations together with improved concepts of TCL1A-associated malignant transformation can benefit future approaches to specifically interfere in TCL1A-initiated or -driven tumorigenesis.
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Bresin A, Callegari E, D'Abundo L, Cattani C, Bassi C, Zagatti B, Narducci MG, Caprini E, Pekarsky Y, Croce CM, Sabbioni S, Russo G, Negrini M. miR-181b as a therapeutic agent for chronic lymphocytic leukemia in the Eµ-TCL1 mouse model. Oncotarget 2015; 6:19807-18. [PMID: 26090867 PMCID: PMC4637322 DOI: 10.18632/oncotarget.4415] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2015] [Accepted: 05/29/2015] [Indexed: 12/05/2022] Open
Abstract
The involvement of microRNAs (miRNAs) in chronic lymphocytic leukemia (CLL) pathogenesis suggests the possibility of anti-CLL therapeutic approaches based on miRNAs. Here, we used the Eµ-TCL1 transgenic mouse model, which reproduces leukemia with a similar course and distinct immunophenotype as human B-CLL, to test miR-181b as a therapeutic agent.In vitro enforced expression of miR-181b mimics induced significant apoptotic effects in human B-cell lines (RAJI, EHEB), as well as in mouse Eµ-TCL1 leukemic splenocytes. Molecular analyses revealed that miR-181b not only affected the expression of TCL1, Bcl2 and Mcl1 anti-apoptotic proteins, but also reduced the levels of Akt and phospho-Erk1/2. Notably, a siRNA anti-TCL1 could similarly down-modulate TCL1, but exhibited a reduced or absent activity in other relevant proteins, as well as a reduced effect on cell apoptosis and viability. In vivo studies demonstrated the capability of miR-181b to reduce leukemic cell expansion and to increase survival of treated mice.These data indicate that miR-181b exerts a broad range of actions, affecting proliferative, survival and apoptotic pathways, both in mice and human cells, and can potentially be used to reduce expansion of B-CLL leukemic cells.
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MESH Headings
- Animals
- Apoptosis
- Apoptosis Regulatory Proteins/genetics
- Apoptosis Regulatory Proteins/metabolism
- Cell Line, Tumor
- Cell Proliferation
- Cell Survival
- Disease Models, Animal
- Extracellular Signal-Regulated MAP Kinases/genetics
- Extracellular Signal-Regulated MAP Kinases/metabolism
- Gene Expression Regulation, Neoplastic
- Genetic Therapy/methods
- Leukemia, Lymphocytic, Chronic, B-Cell/genetics
- Leukemia, Lymphocytic, Chronic, B-Cell/metabolism
- Leukemia, Lymphocytic, Chronic, B-Cell/pathology
- Leukemia, Lymphocytic, Chronic, B-Cell/therapy
- Mice, Transgenic
- MicroRNAs/genetics
- MicroRNAs/metabolism
- Proto-Oncogene Proteins/genetics
- Proto-Oncogene Proteins/metabolism
- Proto-Oncogene Proteins c-akt/genetics
- Proto-Oncogene Proteins c-akt/metabolism
- RNA Interference
- Signal Transduction
- Spleen/immunology
- Spleen/metabolism
- Spleen/pathology
- Time Factors
- Transfection
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Affiliation(s)
- Antonella Bresin
- Università di Ferrara, Dipartimento di Morfologia, Chirurgia e Medicina Sperimentale, Ferrara, Italy
| | - Elisa Callegari
- Università di Ferrara, Dipartimento di Morfologia, Chirurgia e Medicina Sperimentale, Ferrara, Italy
| | - Lucilla D'Abundo
- Università di Ferrara, Dipartimento di Morfologia, Chirurgia e Medicina Sperimentale, Ferrara, Italy
| | - Caterina Cattani
- Istituto Dermopatico dell'Immacolata, IDI-IRCCS, Laboratorio di Oncologia Molecolare, Rome, Italy
| | - Cristian Bassi
- Università di Ferrara, Dipartimento di Morfologia, Chirurgia e Medicina Sperimentale, Ferrara, Italy
| | - Barbara Zagatti
- Università di Ferrara, Dipartimento di Morfologia, Chirurgia e Medicina Sperimentale, Ferrara, Italy
| | - M. Grazia Narducci
- Istituto Dermopatico dell'Immacolata, IDI-IRCCS, Laboratorio di Oncologia Molecolare, Rome, Italy
| | - Elisabetta Caprini
- Istituto Dermopatico dell'Immacolata, IDI-IRCCS, Laboratorio di Oncologia Molecolare, Rome, Italy
| | - Yuri Pekarsky
- Human Cancer Genetics Program and Department of Molecular Virology, Immunology and Medical Genetics, OSU School of Medicine, Ohio State University, Columbus, OH, USA
| | - Carlo M. Croce
- Human Cancer Genetics Program and Department of Molecular Virology, Immunology and Medical Genetics, OSU School of Medicine, Ohio State University, Columbus, OH, USA
| | - Silvia Sabbioni
- Università di Ferrara, Dipartimento di Scienze della Vita e Biotecnologie, Ferrara, Italy
| | - Giandomenico Russo
- Istituto Dermopatico dell'Immacolata, IDI-IRCCS, Laboratorio di Oncologia Molecolare, Rome, Italy
| | - Massimo Negrini
- Università di Ferrara, Dipartimento di Morfologia, Chirurgia e Medicina Sperimentale, Ferrara, Italy
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Herling M, Patel KA, Hsi ED, Chang KC, Rassidakis GZ, Ford R, Jones D. TCL1 in B-cell tumors retains its normal b-cell pattern of regulation and is a marker of differentiation stage. Am J Surg Pathol 2007; 31:1123-9. [PMID: 17592280 DOI: 10.1097/pas.0b013e31802e2201] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The high expression of the T-cell oncogene TCL1 in B-cell tumors and the emergence of B-cell lymphomas in TCL1-transgenic mice suggest a pathogenetic role for this kinase coregulator in B-cell malignancies. We compared the expression of TCL1 in B-cell tumors with their differentiation stage. As with normal B-cell subsets, uniform TCL1 expression was characteristic of tumors of pregerminal center derivation such as precursor B-cell lymphoblastic leukemia/lymphoma (85%, 47/55) and mantle cell lymphoma (84%, 49/58), and was more variable in follicular lymphoma (57%, 28/49). Large B-cell lymphoma was less frequently positive for TCL1 (36%, 18/50), especially among cases of the activated B-cell type. All types of Hodgkin lymphoma, splenic marginal zone lymphoma, and post-germinal center-derived tumors, including plasma cell myeloma and MALT lymphoma, were negative for TCL1, except for 1 case. In nearly all TCL1-expressing tumors, as with normal B cells, variations in cellular TCL1 levels were related to the proliferation and microenvironmental factors. In normal B cells, cell lines and primary B-cell tumor samples, TCL1 downmodulation occurred after prolonged cytokine treatment and/or B-cell receptor stimulation. In contrast to mature T-cell tumors where TCL1 expression is always indicative of an activating TCL1 gene translocation, TCL1 expression in B-cell tumors parallels its regulation in non-neoplastic B cells. Therefore, TCL1 expression can be used diagnostically as an indicator of the differentiation stage of a given B-cell tumor.
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Affiliation(s)
- Marco Herling
- Department of Hematopathology, The University of Texas, M. D. Anderson Cancer Center, Houston, TX 77030, USA
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