کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8841667 1615028 2018 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Suction electrode recording in locus coeruleus of newborn rat brain slices reveals network bursting comprising summated non-synchronous spiking
ترجمه فارسی عنوان
ضبط الکترود ساکشن در لکوس کوئرولوس تکه های مغز موش تازه ای موش صحرایی نشان می دهد که انفجار شبکه شامل کج خلقی غیر همزمان
موضوعات مرتبط
علوم زیستی و بیوفناوری علم عصب شناسی علوم اعصاب (عمومی)
چکیده انگلیسی
The brainstem locus coeruleus (LC) controling behaviors like arousal, sleep, breathing, pain or opioid withdrawal is an established model for spontaneous action potential synchronization. Such synchronous 'spiking' might produce an extracellular field potential (FP) which is a crucial tool for neural network analyses. We found using ≥10 μm tip diameter suction electrodes in newborn rat brainstem slices that the LC generates at ∼1 Hz a robust rhythmic FP (rFP). During distinct rFP phases, LC neurons discharge with a jitter of ±33 ms single spikes that summate to a ∼200 ms-lasting population burst. The rFP is abolished by blocking voltage-gated Na+ channels with tetrodotoxin (TTX, 50 nM) or gap junctions with mefloquine (100 μM) and activating μ-opioid receptors with [D-Ala2,N-Me-Phe4,Gly5-ol]-Enkephalin (DAMGO, 1 μM). Raising superfusate K+ from 3 to 7 mM either increases rFP rate or transforms its pattern to slower and longer multipeak bursts similar to those during early recovery from DAMGO. The results show that electrical coupling of neonatal LC neurons does not synchronize their spiking as previously proposed. They also indicate that both increased excitability (by elevated K+) and recovery from inhibition (by opioids) can enhance spike desynchronization to transform the population burst pattern. Both observations show that this gap junction-coupled neural network has a more complex connectivity than currently assumed. These new findings along with the inhibitory drug effects that are in line with previous reports based on single neuron recording point out that field potential analysis is pivotal to further the understanding of this brain circuit.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Neuroscience Letters - Volume 671, 3 April 2018, Pages 103-107
نویسندگان
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