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© The Rockefeller University Press, 0021-9525/1999//713 $5.00
The Journal of Cell Biology, Volume 145, Number 4, , 1999 713-726


Regular Articles

PKC{varepsilon}, Via its Regulatory Domain and Independently of its Catalytic Domain, Induces Neurite-like Processes in Neuroblastoma Cells



Ruth Zeidman, Bjarne Löfgren, Sven Påhlman, and Christer Larsson

Lund University, Department of Laboratory Medicine, Molecular Medicine, Malmö University Hospital, S-205 02 Malmö, Sweden

To investigate the role of protein kinase C (PKC) isoforms in regulation of neurite outgrowth, PKC{alpha}, βII, {delta}, and {varepsilon} fused to enhanced green fluorescent protein (EGFP) were transiently overexpressed in neuroblastoma cells. Overexpression of PKC{varepsilon}–EGFP induced cell processes whereas the other isoforms did not. The effect of PKC{varepsilon}–EGFP was not suppressed by the PKC inhibitor GF109203X. Instead, process formation was more pronounced when the regulatory domain was introduced. Overexpression of various fragments from PKC{varepsilon} regulatory domain revealed that a region encompassing the pseudosubstrate, the two C1 domains, and parts of the V3 region were necessary and sufficient for induction of processes. By deleting the second C1 domain from this construct, a dominant-negative protein was generated which suppressed processes induced by full-length PKC{varepsilon} and neurites induced during retinoic acid- and growth factor–induced differentiation. As with neurites in differentiated neuroblastoma cells, processes induced by the PKC{varepsilon}– PSC1V3 protein contained {alpha}-tubulin, neurofilament-160, and F-actin, but the PKC{varepsilon}–PSC1V3-induced processes lacked the synaptic markers synaptophysin and neuropeptide Y. These data suggest that PKC{varepsilon}, through its regulatory domain, can induce immature neurite-like processes via a mechanism that appears to be of importance for neurite outgrowth during neuronal differentiation.

Key Words: C1 domains • neuroblastoma cells • neuronal differentiation • neurite outgrowth • protein kinase C



Abbreviations used in this paper: CNTF, ciliary neurotrophic factor; EGFP, enhanced green fluorescent protein; FL, full-length PKC; FLE, full-length PKC bound to EGFP; GFP, green fluorescent protein; NF-160, neurofilament-160; NPY, neuropeptide Y; PKC, protein kinase C; RA, retinoic acid; RACK, receptor for activated C-kinase; RD, regulatory domain; TPA, 12-O-tetradecanoylphorbol-13-acetate.

Financial support was obtained from The Swedish Society for Medical Research, The Swedish Cancer Society, The Children's Cancer Foundation of Sweden, HKH Kronprinsessan Lovisas förening för barnasjukvård, Malmö University Hospital Research Funds, and Magnus Bergvall, Crafoord, Ollie and Elof Ericsson, Hans von Kantzow, Gunnar, Arvid, and Elisabeth Nilsson, and John and Augusta Persson Foundations.



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