RT info:eu-repo/semantics/article
T1 MicroRNA‐135a‐5p reduces P2X7‐dependent rise in intracellular calcium and protects against excitotoxicity
A1 Reigada, David
A1 Soto‐Catalán, Manuel
A1 Nieto‐Díaz, Manuel
A1 Muñoz‐Galdeano, Teresa
A1 del Águila, Ángela
A1 Maza, Rodrigo M.
A1 Calderón García, Andrés Ángel
K1 ATP
K1 Calcio intracelular
K1 miRNA
K1 Receptores purinérgicos
K1 Lesión medular
K1 Neuroprotección
K1 2490.02 Neuroquímica
K1 2403 Bioquímica
AB Excitotoxic cell death because of the massive release of glutamate and ATP contributes to the secondary extension of cellular and tissue loss following traumatic spinal cord injury (SCI). Evidence from blockage experiments suggests that overexpression and activation of purinergic receptors, especially P2X7, produces excitotoxicity in neurodegenerative diseases and trauma of the central nervous system. We hypothesize that the down-regulation of specific miRNAs after the SCI contributes to theover-expression of P2X7and that restorative strategies can be used to reduce the excitotoxic response. In the present study, we have employed bioinformatic analyses to identify microRNAs whose down-regulation following SCI can be responsible for P2X7 over-expression and excitotoxic activity. Additional luciferase assays validated microRNA-135a-5p (miR-135a) as a posttranscriptional modulator of P2X7. Moreover, gene expression analysis in spinal cord samples from a rat SCI model confirmed that the decrease in miR-135a expression correlated with P2X7 over-expression after injury. Transfection of cultures of Neuro-2 a neuronal cell line with a miR-135 a inhibitory sequences (antagomiR-135a), simulating the reduction of miR-135a observed after SCI, resulted in the increase of P2X7 expression and the subsequent ATP-dependent rise in intracellular calcium concentration. Conversely, a restorative strategy employing miR-135a mimicked reduced P2X7 expression, attenuating the increase in intracellular calcium concentration that depends on this receptor and protecting cells from excitotoxic death. Therefore, we conclude that miR-135a is a potential therapeutic target for SCI and that restoration of its expression may reduce the deleterious effects of ATP-dependent excitotoxicity induced after a traumatic spinal cord injury.
PB WILEY
SN 0022-3042
YR 2019
FD 2019
LK https://uvadoc.uva.es/handle/10324/81947
UL https://uvadoc.uva.es/handle/10324/81947
LA spa
NO Journal of Neurochemistry, 2019, Vol. 151, Núm. 1, pp. 116-130
DS UVaDOC
RD 21-ene-2026