Identificador persistente para citar o vincular este elemento: http://hdl.handle.net/10553/44425
Título: Cross-talk among epidermal growth factor, Ap<inf>5</inf>A, and nucleotide receptors causing enhanced ATP Ca<sup>2+</sup>signaling involves extracellular kinase activation in cerebellar astrocytes
Autores/as: Delicado, Esmerilda G.
Jimȩnez, Ana I.
Carrasquero, Luz María G.
Castro López-Tarruella, Enrique 
Miras-Portugal, Ma Teresa
Clasificación UNESCO: 32 Ciencias médicas
Palabras clave: Calcium
Dinucleotides
ERK activation
Glia
Growth factors, et al.
Fecha de publicación: 2005
Editor/a: 0360-4012
Publicación seriada: Journal of Neuroscience Research 
Resumen: In previous papers, we reported that ATP calcium responses in cerebellar astrocytes were strongly potentiated by preincubation with nanomolar concentrations of the diadenosine pentaphosphate Ap5A. However, the intracellular signaling pathway mediating this effect was not defined. We also showed that stimulation of astrocytes with the dinucleotide led to the activation of extracellular regulated kinases (ERKs). Here, we examined whether ERKs are involved in the potentiating mechanism and intracellular mechanism leading to their activation. Epidermal growth factor (EGF) exactly reproduced the potentiation displayed by the dinucleotide. Moreover, the potentiation of ATP responses by Ap5A and EGF was completely abolished by the MAP kinase (MEK) inhibitor U‐0126, indicating that ERK activation is a required step for the potentiation event. Our data also indicated that ERK activation and the potentiation of ATP calcium responses were sensitive to the src‐like kinase inhibitor herbimycin A, p21ras farnesyltransferase inhibitor peptide, and some PKC inhibitors. Taken together, our findings reveal that Ap5A triggers the potentiation of ATP calcium responses through an intracellular mechanism that is insensitive to pertussis toxin and that this potentiation requires src protein‐mediated ERK activation and the participation of an atypical protein kinase C isoform activated downstream from ERK.
URI: http://hdl.handle.net/10553/44425
ISSN: 0360-4012
DOI: 10.1002/jnr.20609
Fuente: Journal of Neuroscience Research [ISSN 0360-4012], v. 81, p. 789-796
Colección:Artículos
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