Pre-TCR-triggered ERK signalling-dependent downregulation of E2A activity in Notch3-induced T-cell lymphoma.

ABSTRACT: Notch and basic helix-loop-helix E2A pathways specify cell fate and regulate neoplastic transformation in a variety of cell types. Whereas Notch enhances tumorigenesis, E2A suppresses it. However, whether and how Notch and E2A interact functionally in an integrative mechanism for regulating neoplastic transformation remains to be understood. It has been shown that Notch3-induced T-cell leukaemia is abrogated by the inactivation of pTalpha/pre-T-cell antigen receptor (pre-TCR). We report here that Notch3-induced transcriptional activation of pTalpha/pre-TCR is responsible for the downregulation of E2A DNA binding and transcriptional activity. Further, the E2A messenger RNA and protein levels remain unaltered but the E2A inhibitor Id1 expression is augmented in thymocytes and T lymphoma cell

SUBMITTER: Talora C 

PROVIDER: S-EPMC1326383 | biostudies-literature | 2003 Nov

REPOSITORIES: biostudies-literature