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Mol Cell. 2003 Apr;11(4):905-14.

Myc-mediated proliferation and lymphomagenesis, but not apoptosis, are compromised by E2f1 loss.

Author information

1
Department of Biochemistry, St. Jude Children's Research Hospital, Memphis, Tennessee 38105, USA.

Abstract

Myc and E2f1 promote cell cycle progression, but overexpression of either can trigger p53-dependent apoptosis. Mice expressing an Emu-Myc transgene in B lymphocytes develop lymphomas, the majority of which sustain mutations of either the Arf or p53 tumor suppressors. Emu-Myc transgenic mice lacking one or both E2f1 alleles exhibited a slower onset of lymphoma development associated with increased expression of the cyclin-dependent kinase inhibitor p27(Kip1) and a reduced S phase fraction in precancerous B cells. In contrast, Myc-induced apoptosis and the frequency of Arf and p53 mutations in lymphomas were unaffected by E2f1 loss. Therefore, Myc does not require E2f1 to induce Arf, p53, or apoptosis in B cells, but depends upon E2f1 to accelerate cell cycle progression and downregulate p27(Kip1).

PMID:
12718877
DOI:
10.1016/s1097-2765(03)00102-3
[Indexed for MEDLINE]
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