A nestin scaffold links Cdk5/p35 signaling to oxidant-induced cell death

Cecilia Sahlgren, Pallari, He, Chou, Goldman, John Eriksson

    Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

    123 Citeringar (Scopus)

    Sammanfattning

    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.
    OriginalspråkOdefinierat/okänt
    Sidor (från-till)4808–4819
    TidskriftEMBO Journal
    Volym25
    Utgåva20
    DOI
    StatusPublicerad - 2006
    MoE-publikationstypA1 Tidskriftsartikel-refererad

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