{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,1]],"date-time":"2026-10-01T20:50:52Z","timestamp":1790887852262,"version":"4.1.0"},"reference-count":74,"publisher":"American Society of Hematology","issue":"6","content-domain":{"domain":["ashpublications.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2026,8,6]]},"abstract":"<jats:sec>\n                    <jats:title>Abstract<\/jats:title>\n                    <jats:p>T-cell acute lymphoblastic leukemia (T-ALL) is an aggressive hematological malignancy arising from the neoplastic transformation of immature T cells during their development in the thymus. Deciphering the developmental programs whose dysregulation drives T-ALL pathogenesis is critical for the development of novel targeted therapies, which remain an urgent unmet need for the treatment of this disease. MicroRNAs (miRNAs) have emerged as key posttranscriptional regulators of numerous physiological processes, including cancer. However, the specific role of miRNAs in human T-cell development and T-ALL pathogenesis remains largely unexplored. In this study, we comprehensively evaluated miRNA expression profiles across human T-cell development using microarray analysis and identified a dynamic expression pattern of miR-16-2, which is upregulated during early pre\u2013T-cell proliferative stages up to the resting stage of immature thymocytes immediately preceding T-cell receptor \u03b1\u03b2 expression and is subsequently downregulated. We also confirmed the coordinated regulation of miR-15b expression, consistent with the reported clustered genomic location of both miRNAs. Notably, functional studies identified the miR-15b\/16-2 cluster as a negative regulator of early thymocyte proliferation and demonstrated that overexpression of miR-15b\/16-2 in T-ALL cells impaired leukemic growth in vitro and tumor progression in patient-derived xenotransplantation assays. Mechanistically, miR-15b\/16-2 represses the expression of the genes encoding BCL-2 and cyclin D3, thereby promoting apoptosis and cell cycle dysregulation in T-ALL cells, characterized by an accumulation of G0-phase cells and a defective transition to the G2\/M phase. Overall, these findings support a novel tumor-suppressive function for miR-15b\/16-2 in T-ALL and highlight its potential as a promising therapeutic target.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1182\/blood.2025030670","type":"journal-article","created":{"date-parts":[[2026,4,8]],"date-time":"2026-04-08T16:23:44Z","timestamp":1775665424000},"page":"724-738","update-policy":"https:\/\/doi.org\/10.1182\/blood.2019cm0000","source":"Crossref","is-referenced-by-count":2,"title":["A tumor suppressor role of the miR-15b\/16-2 cluster in T-cell acute lymphoblastic leukemia"],"prefix":"10.1182","volume":"148","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8637-0373","authenticated-orcid":false,"given":"Mar\u00eda L.","family":"Toribio","sequence":"first","affiliation":[{"name":"1Development and Function of Immune System Unit, Centro de Biolog\u00eda Molecular Severo Ochoa, Consejo Superior de Investigaciones Cient\u00edficas and Universidad Aut\u00f3noma de Madrid, Madrid, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9790-808X","authenticated-orcid":false,"given":"Mar\u00eda J.","family":"Garc\u00eda-Le\u00f3n","sequence":"additional","affiliation":[{"name":"1Development and Function of Immune System Unit, Centro de Biolog\u00eda Molecular Severo Ochoa, Consejo Superior de Investigaciones Cient\u00edficas and Universidad Aut\u00f3noma de Madrid, Madrid, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8791-132X","authenticated-orcid":false,"given":"Marina","family":"Garc\u00eda-Peydr\u00f3","sequence":"additional","affiliation":[{"name":"1Development and Function of Immune System Unit, Centro de Biolog\u00eda Molecular Severo Ochoa, Consejo Superior de Investigaciones Cient\u00edficas and Universidad Aut\u00f3noma de Madrid, Madrid, 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