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Endocrinology Vol. 138, No. 3 1111-1120
Copyright © 1997 by The Endocrine Society

Articles

The Effect of Cyclic Adenosine Monophosphate on the Mitogen-Activated Protein Kinase Pathway Depends on Both the Cell Type and the Type of Tyrosine Kinase-Receptor1

Véronique Calleja, Pilar Ruiz Enríquez2, Chantal Filloux, Pascal Peraldi, Véronique Baron and Emmanuel Van Obberghen

INSERM U145, Faculté de Médecine, Avenue de Valombrose, 06107, Nice cedex 02, France

Address all correspondence and requests for reprints to: E. Van Obberghen, M.D., Ph.D., INSERM U145, Faculté de Médecine, Avenue de Valombrose, 06107 Nice Cedex 02, France. E-mail: vanobberg{at}unice.fr

The mitogen-activated protein kinase (MAP kinase) is a key participant in growth factor-stimulated intracellular events such as proliferation and differentiation. We and others have previously described a cross-talk between the MAP kinase pathway and the cAMP pathway. Indeed, in several cell lines and, in particular in fibroblasts, an increase in the level of cAMP produced an inhibition of MAP kinase together with decreased cell proliferation. In contrast, in PC12 cells, cAMP induced an increase in the NGF-induced activation of MAP kinase concomitantly with augmented NGF-induced differentiation. Therefore, it has been proposed that the cellular context is important for the nature of the cAMP effects on growth factor-stimulated MAP kinase activity. Here we show that the type of tyrosine kinase receptor stimulated also participates in the nature of the cAMP effect. Thus, in NIH3T3 fibroblasts expressing NGF receptors (NIH3T3/trk cells) we found that cAMP potentiates NGF-stimulated ERK1 and MEK1 activities, whereas in NIH3T3 fibroblasts expressing insulin receptors (NIH3T3/IR cells) we saw no effect of cAMP on the activation of insulin-stimulated ERK1 and MEK1. In PC12 cells and in Rat1 fibroblasts expressing insulin receptors (PC12/IR and Rat1/IR cells) we observed, respectively, a potentiation and an inhibition of insulin-stimulated ERK1 activity. In addition, cAMP does not seem to modify the basal nor growth factor-stimulated Shc or IRS-1 tyrosine phosphorylation in the different cell lines studied. Finally, we observed that cAMP inhibited serum- and insulin-induced, but not NGF-induced, cell proliferation in NIH3T3 cells. However, cAMP potentiated insulin-stimulated cell differentiation in PC12/IR cells. These results led us to conclude that the cAMP effect on cell proliferation in NIH3T3 fibroblasts and PC12/IR cells appears to be correlated, in part, with the effect of cAMP on the MAP kinase pathway, but by itself this pathway cannot fully account for these observations.




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