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Published 6 August 2001. doi:10.1083/jcb.200101023
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© The Rockefeller University Press, 0021-9525/2001/8/585 $5.00
The Journal of Cell Biology, Volume 154, Number 3, August 6, 2001 585-598

Article

Neuronal survival induced by neurotrophins requires calmodulin



Joaquim Egea1, Carme Espinet1, Rosa M. Soler1, Xavier Dolcet1, Víctor J. Yuste1, Mario Encinas1, Montserrat Iglesias1, Nativitat Rocamora2 and Joan X. Comella1

1 Grup de Neurobiologia Molecular, Departament de Ciències Mèdiques Bàsiques, Facultat de Medicina, Universitat de Lleida, 25198 Lleida, Catalonia, Spain
2 Laboratori de Biologia Molecular, Institut Català d'Oncologia, Barcelona, Catalonia, Spain

Address correspondence to Joan X. Comella, Grup de Neurobiologia Molecular, Departament de Ciències Mèdiques Bàsiques, Universitat de Lleida, Avda Rovira Roure, 44, 25198 Lleida, Spain. Tel.: 34-973-702414. Fax: 34-973-702438. E-mail: joan.comella{at}cmb.udl.es

It has been reported that phosphoinositide 3-kinase (PI 3-kinase) and its downstream target, protein kinase B (PKB), play a central role in the signaling of cell survival triggered by neurotrophins (NTs). In this report, we have analyzed the involvement of Ca2+ and calmodulin (CaM) in the activation of the PKB induced by NTs. We have found that reduction of intracellular Ca2+ concentration or functional blockade of CaM abolished NGF-induced activation of PKB in PC12 cells. Similar results were obtained in cultures of chicken spinal cord motoneurons treated with brain-derived neurotrophic factor (BDNF). Moreover, CaM inhibition prevented the cell survival triggered by NGF or BDNF. This effect was counteracted by the transient expression of constitutive active forms of the PKB, indicating that CaM regulates NT-induced cell survival through the activation of the PKB. We have investigated the mechanisms whereby CaM regulates the activation of the PKB, and we have found that CaM was necessary for the proper generation and/or accumulation of the products of the PI 3-kinase in intact cells.

Key Words: calmodulin; neurotrophin; cell survival; PKB; motoneuron


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