کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2495314 1115611 2007 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Excitatory amino acid receptor-mediated responses in periaqueductal gray neurons are increased during ethanol withdrawal
موضوعات مرتبط
علوم زیستی و بیوفناوری علم عصب شناسی علوم اعصاب رفتاری
پیش نمایش صفحه اول مقاله
Excitatory amino acid receptor-mediated responses in periaqueductal gray neurons are increased during ethanol withdrawal
چکیده انگلیسی

The ventrolateral periaqueductal gray (PAG) is critical for propagation in the neuronal network for ethanol withdrawal (ETX) seizures, and ethanol is known to alter glutamate effects. This study evaluated changes in glutamate antagonist effects on PAG neurophysiology in brain slices from rats treated with ethanol in vivo. Spontaneous action potentials were rare in control PAG neurons but common during ETX. Spontaneous excitatory postsynaptic potential (EPSP) frequency was increased during ETX, and an AMPA antagonist, 6,7-dinitroquinoxaline-2,3-dione (DNQX) was more effective in suppressing this activity than an NMDA antagonist, 2-amino-7-phosphonoheptanoate (AP7). EPSPs evoked by stimulation of dorsolateral PAG were decreased by AP7 or DNQX in ETX and control neurons. EPSPs of ETX neurons were significantly less sensitive than controls to blockade by AP7 and DNQX. Paired-pulse facilitation of EPSPs was significantly increased during ETX, but paired-pulse inhibition occurred in controls. Thus, PAG hyperexcitability during ETX results from alterations of both NMDA and AMPA receptor-mediated neurotransmission, which may contribute importantly to ETX seizures. These results differ from previous findings in the seizure-initiating site for ETX seizures, inferior colliculus (IC), where NMDA receptor-mediated mechanisms dominate excitability increases during ETX. This dichotomy may be related to the different role played by IC and PAG in the ETX seizure network.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Neuropharmacology - Volume 52, Issue 3, March 2007, Pages 802–811
نویسندگان
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