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          <att_value att_id="a366" value="Prior studies indicate that one of the kinases that phosphorylates tau (mitogen-activated protein kinase, or MAP kinase) does so at least in part indirectly within intact neuronal cells by phosphorylating and activating the L-voltage-sensitive calcium channel. Resultant calcium influx then fosters tau phosphorylation via one or more calcium-activated kinases.  okadaic acid (OA) similarly may increase tau phosphorylation via sustained activation of the L-voltage-sensitive calcium channel. OA increased phospho-tau as indicated by increased immunoreactivity towards an antibody (PHF-1) directed against paired helical filaments from AD brain. This increase was blocked by co-treatment with the channel antagonist nimodipine. ... Okadaic acid (OA) treatment increased channel phosphorylation. The increases in calcium influx, PHF-1 immunoreactivity and channel phosphorylation were all attenuated by co-treatment with PD98059, which inhibits MAP kinase activity, suggesting that OA mediates these effects at least in part via sustained activation of MAP kinase. (Ekinci FJ et al. 2003)" />
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