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| Subject Categories: Signal Transduction | Differentiation & Death |
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| The EMBO Journal
(2006) 25, 4808–4819, doi:10.1038/sj.emboj.7601366 Published online 12 October 2006 |
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| A nestin scaffold links Cdk5/p35 signaling to oxidant-induced cell death |
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| Cecilia M Sahlgren1, 2, 5, Hanna-Mari Pallari1, 3, 5, Tao He1, 2, Ying-Hao Chou4, Robert D Goldman4 and John E Eriksson1, 2 |
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1 Turku Centre for Biotechnology, University of Turku and Åbo Akademi University, Turku, Finland 2 Department of Biology, Åbo Akademi University, BioCity, Turku, Finland 3 Department of Biology, Laboratory of Animal Physiology, University of Turku, Turku, Finland 4 Department of Cell and Molecular Biology, Feinberg School of Medicine, Northwestern University, IL, USA To whom correspondence should be addressed John E Eriksson, Department of Biology, Åbo Akademi University, 20520 Turku, Finland. Tel.: +358 2 333 8036; Fax: +358 2 333 8000; E-mail: john.eriksson@btk.fi 5 These authors contributed equally to this work Received 17 November 2005; Accepted 1 September 2006; Published online 12 October 2006. |
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| Abstract |
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| The intermediate filament protein, nestin, has been implicated as an organizer of survival-determining signaling molecules. When nestin expression was related to the sensitivity of neural progenitor cells to oxidant-induced apoptosis, nestin displayed a distinct cytoprotective effect. Oxidative stress in neuronal precursor cells led to downregulation of nestin with subsequent activation of cyclin-dependent kinase 5 (Cdk5), a crucial kinase in the nervous system. Nestin downregulation was a prerequisite for the Cdk5-dependent apoptosis, as overexpression of nestin efficiently inhibited induction of apoptosis, whereas depletion of nestin by RNA interference had a sensitizing effect. When the underlying link between nestin and Cdk5 was analyzed, we observed that nestin serves as a scaffold for Cdk5, with binding restricted to a specific region following the alpha-helical domain of nestin, and that the presence and organization of nestin regulated the sequestration and activity of Cdk5, as well as the ubiquitylation and turnover of its regulator, p35. Our data imply that nestin is a survival determinant whose action is based upon a novel mode of Cdk5 regulation, affecting the targeting, activity, and turnover of the Cdk5/p35 signaling complex. |
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| Keywords: apoptosis, Cdk5 kinase, nestin, oxidative stress, signaling scaffold |
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