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Title: Kainate receptors mediate regulated exocytosis of secretory phospholipase A2 in SH-SY5Y neuroblastoma cells
Authors: Farooqui, Akhlaq A.
Than, Aung
Tan, Yan
Ong, Wei-Yi
Chen, Peng
Keywords: DRNTU::Science::Biological sciences::Human anatomy and physiology::Neurobiology
Issue Date: 2011
Source: Than, A., Tan, Y., Ong, W. Y., Farooqui, A. A., & Chen P. (2012). Kainate Receptors Mediate Regulated Exocytosis of Secretory Phospholipase A2 in SH-SY5Y Neuroblastoma Cells. Neurosignals, 20(2), 72-85.
Series/Report no.: Neurosignals
Abstract: Secretory phospholipase A(2) (sPLA(2)) isoforms are widely expressed in the brain and spinal cord. Group IIA sPLA(2) (sPLA(2)-IIA) has been shown to stimulate exocytosis and release of neurotransmitters in neuroendocrine PC12 cells and neurons, suggesting a role of the enzyme in neuronal signaling and synaptic transmission. However, the mechanisms by which sPLA(2) is itself released, and a possible relation between glutamate receptors and sPLA(2) exocytosis, are unknown. This study was carried out to elucidate the effects of glutamate receptor agonists on exocytosis of sPLA(2)-IIA in transfected SH-SY5Y neuroblastoma cells. sPLA(2)-IIA enzyme was packaged in fusion-competent vesicles and released constitutively or upon stimulation, suggesting regulated secretion. The signal peptide of sPLA(2)-IIA is required for its vesicular localization and exocytosis. External application of α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) and kainate (KA) induced vesicular exocytosis and release of sPLA(2)-IIA. UBP 302, a GluR5-specific KA receptor antagonist, abolished the effect of KA, confirming the role of KA receptors in mediating sPLA(2)-IIA secretion. Moreover, KA-induced sPLA(2)-IIA secretion is dependent on Ca(2+) and protein kinase C. Together, these findings provide evidence of a link between glutamate receptors and regulated sPLA(2) secretion in neurons that may play an important role in synaptic plasticity, pain transmission and neurodegenerative diseases.
DOI: 10.1159/000330414
Rights: © 2011 S. Karger AG, Basel.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SCBE Journal Articles

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