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FEBS Lett. 2002 Apr 10;516(1-3):187-90.

Conventional protein kinase C isoforms regulate human dopamine transporter activity in Xenopus oocytes.

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  • 1Department of Pharmacology and Neuroscience Program, C-236, University of Colorado Health Sciences Center, 4200 East Ninth Avenue, Denver, CO 80262, USA.


The hypothesis that specific protein kinase C (PKC) isoforms regulate dopamine transporter (DAT) function was tested in Xenopus laevis oocytes expressing human (h)DAT. Activation of conventional PKCs (cPKCs) and novel PKCs (nPKCs) using 10 nM phorbol 12-myristate 13-acetate (PMA) significantly inhibited DAT-associated transport currents. This effect was reversed by isoform-non-selective PKC inhibitors, selective inhibitors of cPKCs and deltaPKC, and by Ca2+ chelation. By contrast, the epsilonPKC translocation inhibitor peptide had no effect on PMA-induced inhibition of hDAT transport-associated currents. Thus, the primary mechanism by which PMA regulates hDAT expressed in oocytes appears to be by activating cPKC(s).

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