Abstract
Neurotrophic factors have been proposed for the treatment of a variety of neurological diseases. However, to this point they have failed in clinical trials. One potential problem is that while neurotrophic factors attenuate apoptosis, they have the potential to enhance necrosis. In this study we show that neurotrophin-4 (NT-4) attenuated apoptotic neuronal death while potentiating necrotic neuronal death in cortical cultures. The protective effects of NT-4 were not blocked by the mitogen-activated protein kinase kinase (MEK) inhibitors PD098059 or U0126, while the injury potentiation by NT-4 was blocked by these inhibitors. NT-4 stimulated the phosphorylation of ERK1/2 and this phosphorylation was attenuated by U0126 and PD098059. The results indicate a disassociation between the pathway by which NT-4 potentiates necrosis, and that by which it attenuates apoptosis, and suggest that addition of a MEK inhibitor may enhance the beneficial effects of NT-4 in treating complex injuries such as occur in vivo.
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Lobner, D., Liot, G. Role of MAPK/ERK in Neurotrophin-4 Potentiation of Necrotic Neuronal Death. Neurochem Res 29, 2303–2309 (2004). https://doi.org/10.1007/s11064-004-7040-4
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DOI: https://doi.org/10.1007/s11064-004-7040-4