Abstract
Apoptosis is a major mechanism for cell death in the nervous system during development. P2X7 nucleotide receptors are ionotropic ATP receptors that mediate cell death under pathological conditions. We developed an in vitro protocol to investigate the expression and functional responses of P2X7 nucleotide receptors during retinoic acid (RA)-induced neuronal differentiation of human SH-SY5Y neuroblastoma cells. Neuronal differentiation was examined measuring cellular growth arrest and neuritic processes elongation. We found that SH-SY5Y cells treated for 5 days with RA under low serum content exhibited a neuron-like phenotype with neurites extending more than twice the length of the cell body and cell growth arrest. Concurrently, we detected the abolishment of intracellular-free calcium mobilization and the down-regulation of P2X7 nucleotide receptor protein expression that protected differentiated cells from neuronal cell death and reduced caspase-3 cleavage-induced by P2X7 nucleotide receptor agonist. The role of P2X7 nucleotide receptors in neuronal death was established by selectively antagonizing the receptor with KN-62 prior to its activation. We assessed the involvement of protein kinases and found that p38 signaling was activated in undifferentiated after nucleotide stimulation, but abolished by the differentiating RA pretreatment. Importantly, P2X7 receptor-induced caspase-3 cleavage was blocked by the p38 protein kinase specific inhibitor PD169316. Taken together, our results suggest that RA treatment of human SH-SY5Y cells leads to decreased P2X7 nucleotide receptor protein expression thus protecting differentiated cells from extracellular nucleotide-induced neuronal death, and p38 signaling pathway is critically involved in this protection of RA-differentiated cells.
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Acknowledgments
The authors are grateful to Dr. Michelle Burgos (BD, Biosciences) for useful discussion and for critical reading of the manuscript. We appreciate the excellent technical assistance of Cydmarie Cruz Quintana. The project described was supported by Grant P20 RR016470 from the National Center for Research Resources. The content is solely the responsibility of the authors and does not necessarily represent the official view of the National Center for Research Resources or National Institutes of Health. Elsie A. Orellano has a pre-doctoral fellowship from Puerto Rico Industrial Development Company (PRIDCO).
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Orellano, E.A., Rivera, O.J., Chevres, M. et al. Inhibition of neuronal cell death after retinoic acid-induced down-regulation of P2X7 nucleotide receptor expression. Mol Cell Biochem 337, 83–99 (2010). https://doi.org/10.1007/s11010-009-0288-x
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DOI: https://doi.org/10.1007/s11010-009-0288-x