Myc-mediated proliferation and lymphomagenesis,but not apoptosis,are compromised by E2f1 loss |
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Authors: | Baudino Troy A Maclean Kirsteen H Brennan Jennifer Parganas Evan Yang Chunying Aslanian Aaron Lees Jacqueline A Sherr Charles J Roussel Martine F Cleveland John L |
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Affiliation: | Department of Biochemistry, St. Jude Children's Research Hospital, Memphis, Tennessee 38105, USA. |
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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). |
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