Integrin alpha 2 beta 1 promotes activation of protein phosphatase 2A and dephosphorylation of Akt and glycogen synthase kinase 3 beta

J Ivaska, L Nissinen, N Immonen, John Eriksson, VM Kähäri, J Heino

    Research output: Contribution to journalArticleScientificpeer-review


    Serine/threonine kinase Akt is a downstream effector protein of phosphatidylinositol-3-kinase (PI-3K). Many integrins can function as positive modulators of the PI-3K/Akt pathway. Integrin alpha 2 beta 1 is a collagen receptor that has been shown to induce specific signals distinct from those activated by other integrins. Here, we found that, in contrast what was found for cells adherent to fibronectin, alpha 2 beta 1-mediated cell adhesion to collagen leads to dephosphorylation of Akt and glycogen synthase kinase 3 beta (GSK3 beta) and concomitantly to the induction of protein serine/threonine phosphatase 2A (PP2A) activity. PP2A activation can be inhibited by mutation in the alpha 2 cytoplasmic domain and by a function-blocking anti-alpha 2 antibody. Akt can be coprecipitated with PP2A, and coexpression of Akt with PP2Ac (catalytic subunit) inhibits Akt kinase activity. Integrin alpha 2 beta 1-related activation of PP2A is dependent on Cdc42. These results indicate that cell adhesion to collagen modulates Akt activity via the alpha 2 beta 1-induced activation of PP2A.
    Original languageUndefined/Unknown
    Pages (from-to)1352–1359
    JournalMolecular and Cellular Biology
    Issue number5
    Publication statusPublished - 2002
    MoE publication typeA1 Journal article-refereed

    Cite this