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Regulation of proteasome activity by P2Y2 receptor underlies the neuroprotective effects of extracellular nucleotides



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Diego García, Laura de y Ramírez Escudero, Mercedes y Sebastián Serrano, Álvaro y Díaz Hernández, Juan Ignacio y Pintor, Jesús y Lucas Lozano, José J. y Díaz Hernández, Miguel (2017) Regulation of proteasome activity by P2Y2 receptor underlies the neuroprotective effects of extracellular nucleotides. Bioquimica et biophysica acta, 1863 (1). pp. 43-51. ISSN 0006-3002

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URL Oficial: https://doi.org/10.1016/j.bbadis.2016.10.012


The Ubiquitin-Proteasome System (UPS) is essential for the regulation of the cellular proteostasis. Indeed, it has been postulated that an UPS dysregulation is the common mechanism that underlies several neurological disorders. Considering that extracellular nucleotides, through their selective P2Y2 receptor (P2Y2R), play a neuroprotective role in various neurological disorders that course with an UPS impairment, we wonder if this neuroprotective capacity resulted from their ability to modulate the UPS. Using a cellular model expressing two different UPS reporters, we found that the stimulation of P2Y2R by its selective agonist Up4U induced a significant reduction of UPS reporter levels. This reduction was due to an increase in two of the three peptidase proteasome activities, chymotrypsin and postglutamyl, caused by an increased expression of proteasome constitutive catalytic subunits β1 and β5. The intracellular signaling pathway involved required the activation of IP3/MEK1/2/ERK but was independent of PKC or PKA. Interestingly, the P2Y2R activation was able to revert both UPS-reporter accumulation and the cell death induced by a prolonged inhibition of UPS. Finally, we also observed that intracerebroventricular administration of Up4U induced a significant increase both of chymotrypsin and postglutamyl activities as well as an increased expression of proteasome subunits β1 and β5 in the hippocampus of wild-type mice, but not in P2Y2R KO mice. All these results strongly suggest that the capacity to modulate the UPS activity via P2Y2R is the molecular mechanism which is how the nucleotides play a neuroprotective role in neurological disorders.

Tipo de documento:Artículo
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Received 23 June 2016, Revised 22 September 2016, Accepted 16 October 2016, Available online 18 October 2016.

Palabras clave:Chymotrypsin-like activity; Neurological disorders; P2Y2 receptor; Postglutamyl-like activity; Ubiquitin-proteasome-system; Up4U
Materias:Ciencias > Química > Bioquímica
Ciencias Biomédicas > Medicina > Fisiología
Ciencias Biomédicas > Medicina > Neurociencias
Ciencias Biomédicas > Biología > Biología molecular
Código ID:45087
Depositado:13 Oct 2017 07:55
Última Modificación:16 Oct 2017 08:13

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