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MBC in Press, published online ahead of print October 5, 2005
Mol. Biol. Cell 10.1091/mbc.E05-05-0432

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Submitted on May 17, 2005
Revised on September 7, 2005
Accepted on September 27, 2005

Epac Activation Converts cAMP from a Proliferative into a Differentiation Signal in PC12 Cells

Simone Kiermayer, Ricardo M. Biondi, Jochen Imig, Guido Plotz, Jörg Haupenthal, Stefan Zeuzem, and Albrecht Piiper

Department of Internal Medicine, University of Saarland, D-66421 Homburg/Saar, Germany

Monitoring Editor: J. Silvio Gutkind

Elevation of the intracellular cAMP concentration ([cAMP]i) regulates metabolism, cell proliferation and differentiation, and plays roles in memory formation and neoplastic growth. cAMP mediates its effects mainly through activation of protein kinase A (PKA) as well as Epac1 and Epac2, exchange factors activating the small GTPases Rap1 and Rap2. However, how cAMP utilizes these effectors to induce distinct biological responses is unknown. We here studied the specific roles of PKA and Epac in neuroendocrine PC12 cells. In these cells, elevation of [cAMP]i activates extracellular signal-regulated kinase (ERK) 1/2 and induces low-degree neurite outgrowth. The present study showed that specific stimulation of PKA triggered ERK1/2 activation that was considerably more transient than that observed upon simultaneous activation of both PKA and Epac. Unexpectedly, the PKA-specific cAMP analog induced cell proliferation rather than neurite outgrowth. The proliferative signaling pathway activated by the PKA-specific cAMP analog involved activation of the epidermal growth factor receptor and ERK1/2. Activation of Epac appeared to extend the duration of PKA-dependent ERK1/2 activation and converted cAMP from a proliferative into an anti-proliferative, neurite outgrowth-promoting signal. Thus, the present study showed that the outcome of cAMP signaling can depend heavily on the set of cAMP effectors activated.

Address correspondence to: Albrecht Piiper (inapii{at}uniklinikum-saarland.de)




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