Identificador persistente para citar o vincular este elemento: http://hdl.handle.net/10553/49500
Título: Apoptosis induced by Rac GTPase correlates with induction of FasL and ceramides production
Autores/as: Embade, N.
Valeron, P. F. 
Aznar, S.
Lopez-Collazo, E.
Lacal, J. C.
Clasificación UNESCO: 32 Ciencias médicas
2407 Biología celular
Palabras clave: Apoptosis
GTAPases
Ceramides
Fecha de publicación: 2000
Publicación seriada: Molecular Biology of the Cell 
Resumen: Rho proteins, members of the Ras superfamily of GTPases, are critical elements in signal transduction pathways governing cell proliferation and cell death. Different members of the family of human Rho GTPases, including RhoA, RhoC, and Rac1, participate in the regulation of apoptosis in response to cytokines and serum deprivation in different cell systems. Here, we have characterized the mechanism of apoptosis induced by Rac1 in NIH 3T3 cells. It requires protein synthesis and caspase-3 activity, but it is independent of the release of cytochrome c from mitochondria. Moreover, an increase in mitochondria membrane potential and the production of reactive oxygen species was observed. Rac1-induced apoptosis was related to the simultaneous increase in ceramide production and synthesis of FasL. Generation of FasL may be mediated by transcriptional regulation involving both c-Jun amino terminal kinase as well as nuclear factor-κB-dependent signals. None of these signals, ceramides or FasL, was sufficient to induce apoptosis in the parental cell line, NIH 3T3 cells. However, any of them was sufficient to induce apoptosis in the Rac1-expressing cells. Finally, inhibition of FasL signaling drastically reduced apoptosis by Rac1. Thus, Rac1 seems to induce apoptosis by a complex mechanism involving the generation of ceramides and the de novo synthesis of FasL. These results suggest that apoptosis mediated by Rac1 results from a signaling mechanism that involves biochemical and transcriptional events under control of Rac1.
URI: http://hdl.handle.net/10553/49500
ISSN: 1059-1524
DOI: 10.1091/mbc.11.12.4347
Fuente: Molecular Biology of the Cell[ISSN 1059-1524],v. 11(12), p. 4347-4358 (Diciembre 2000)
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