Involvement of P2X7 receptor in neuronal degeneration triggered by traumatic injury.

Abstract:

:Axonal injury is a common feature of central nervous system insults that culminates with the death of the affected neurons, and an irreversible loss of function. Inflammation is an important component of the neurodegenerative process, where the microglia plays an important role by releasing proinflammatory factors as well as clearing the death neurons by phagocytosis. Here we have identified the purinergic signaling through the P2X7 receptor as an important component for the neuronal death in a model of optic nerve axotomy. We have found that in P2X7 receptor deficient mice there is a delayed loss of retinal ganglion cells and a decrease of phagocytic microglia at early times points after axotomy. In contralateral to the axotomy retinas, P2X7 receptor controlled the numbers of phagocytic microglia, suggesting that extracellular ATP could act as a danger signal activating the P2X7 receptor in mediating the loss of neurons in contralateral retinas. Finally, we show that intravitreal administration of the selective P2X7 receptor antagonist A438079 also delays axotomy-induced retinal ganglion cell death in retinas from wild type mice. Thus, our work demonstrates that P2X7 receptor signaling is involved in neuronal cell death after axonal injury, being P2X7 receptor antagonism a potential therapeutic strategy.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Nadal-Nicolás FM,Galindo-Romero C,Valiente-Soriano FJ,Barberà-Cremades M,deTorre-Minguela C,Salinas-Navarro M,Pelegrín P,Agudo-Barriuso M

doi

10.1038/srep38499

subject

Has Abstract

pub_date

2016-12-08 00:00:00

pages

38499

issn

2045-2322

pii

srep38499

journal_volume

6

pub_type

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