Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/68644
標題: Leptin and Interleukin-1 beta Modulate Neuronal Glutamate Release and Protect Against Glucose-Oxygen-Serum Deprivation
作者: Wang, C.H.
Wang, W.T.
Cheng, S.Y.
Hung, W.T.
Wu, T.L.
Hsueh, C.M.
關鍵字: Apoptosis
glucose-oxygen-serum deprivation
glutamate
IL-1 beta
leptin
transient cerebral-ischemia
hippocampal slice cultures
cell-death
receptor antagonist
tnf-alpha
in-vitro
induced excitotoxicity
sh-sy5y cells
ca1 neurons
il-1-beta
期刊/報告no:: Current Neurovascular Research, Volume 7, Issue 3, Page(s) 223-237.
摘要: Molecular mechanism underlying leptin-mediated neuronal protection against glucose-oxygen-serum deprivation (GOSD) insult was investigated by focusing on the interactions among leptin, Interleukin-1 beta (IL-1 beta) and glutamate and their impacts on the growth of neurons under GOSD. The trypan blue dye exclusion assay, 4',6-diamidino-2-phenylindole (DAPI) assay, cytokine antibody array assay, immunocytochemical staining assay, glutamate determination kit, immunoblocking and chemical blocking strategies were applied to serve the study goal. Results showed that in response to 6 h of GOSD, cortical neurons can secrete significant amounts of leptin and IL-1 beta to protect neurons from GOSD-induced cell damage. Serine/threonine kinase Akt (Akt) and extracellular signal-related kinase (ERK) inhibitors significantly reversed leptin-mediated neuroprotection. GOSD-induced IL-1 beta was further enhanced by leptin in Akt/ERK-dependent manner. Blockade of endogenous leptin with specific antibodies significantly inhibited GOSD-induced IL-1 beta. expression and increased glutamate release from GOSD neurons. IL-1 blockade with IL-1 receptor antagonist (IL-1ra) on the other hand, inhibited leptin-mediated neuroprotection and suppression of glutamate release from GOSD neurons. Pre-treating GOSD neurons with leptin and IL-1 beta in combined significantly increased their survival but decreased their releases of glutamate. The results indicate that leptin may act through Akt and ERK signaling pathways to protect neurons from GOSD insult; the protection was in part IL-1 beta dependent and through which the glutamate release from GOSD neurons was inhibited. Therapeutic values of leptin and IL-1 beta were suggested in the treatment of cerebral ischemia at early stage.
URI: http://hdl.handle.net/11455/68644
ISSN: 1567-2026
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