Cross talk among Notch3, pre-TCR, and Tal1 in T-cell development and leukemogenesis

Claudio Talora, Samantha Cialfi, Christian Oliviero, Rocco Palermo, Monica Pascucci, Luigi Frati, Alessandra Vacca, Alberto Gulino, Isabella Screpanti

Research output: Contribution to journalArticlepeer-review


Integrated pathways are believed to determine hematopoietic cell fate and/or neoplastic transformation. Notch signaling has been shown to regulate T-cell differentiation and leukemogenesis. However, specific target genes and molecular partners are not fully elucidated. We show that Notch3 activation sustains aberrant SCL/Tal1 overexpression and phosphorylation in mature thymocytes. Furthermore, we define the role of SCL/Tal1 as a component of an activator complex, including phosphorylated Tal1 and Sp1, that specifically enhances cyclin D1 expression and demonstrate that Tal1/Sp1 specifically co-occupy the D1 promoter in vivo, only in the presence of pre-T-cell receptor (TCR). We therefore conclude not only that cyclin D1 is a target of the Tal1/Sp1 complex, but also that Notch3-dependent activation of pre-TCR/ERK signaling regulates SCL/Tal1 function.

Original languageEnglish
Pages (from-to)3313-3320
Number of pages8
Issue number8
Publication statusPublished - Apr 15 2006

ASJC Scopus subject areas

  • Hematology


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