Bmk1/Erk5 is required for cell proliferation induced by epidermal growth factor

Yutaka Kato, Richard I. Tapping, Shuang Huang, Mark H. Watson, Richard J. Ulevitch and Jiing-Dwan Lee ()
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Yutaka Kato: The Scripps Research Institute
Richard I. Tapping: The Scripps Research Institute
Shuang Huang: The Scripps Research Institute
Mark H. Watson: The Scripps Research Institute
Richard J. Ulevitch: The Scripps Research Institute
Jiing-Dwan Lee: The Scripps Research Institute

Nature, 1998, vol. 395, issue 6703, 713-716

Abstract: Abstract Epidermal growth factor (EGF) induces cell proliferation in a variety of cell types by binding to a prototype transmembrane tyrosine kinase receptor1,2. Ligation of this receptor by EGF activates Erk1 and Erk2, members of the mitogen-activated protein (MAP) kinase family, through a Ras-dependent signal transduction pathway3,4,5. Despite our detailed understanding of these events, the exact mechanism by which EGF causes cells to proliferate is unclear. Big MAP kinase (Bmk1), also known as Erk5, is a member of the MAP kinase family that is activated in cells in response to oxidative stress, hyperosmolarity and treatment with serum6,7. Here we show that EGF is a potent activator of Bmk1. In contrast to Erk1/2, EGF-mediated activation of Bmk1 occurs independently of Ras and requires the MAP-kinase kinase Mek5. Expression of a dominant-negative form of Bmk1 blocks EGF-induced cell proliferation and prevents cells from entering the S phase of the cell cycle. These results demonstrate that Bmk1 is part of a distinct MAP-kinase signalling pathway that is required for EGF-induced cell proliferation and progression through the cell cycle.

Date: 1998
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DOI: 10.1038/27234

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