کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6015837 | 1579915 | 2013 | 17 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Electrographic seizures are significantly reduced by in vivo inhibition of neuronal uptake of extracellular glutamine in rat hippocampus
ترجمه فارسی عنوان
تشنج های الکتروگرافی به طور قابل ملاحظه ای با مهار جذب عصبی گلوتن خارج سلولی در هیپوکامپ موش کاهش می یابد
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کلمات کلیدی
SNATECFMeAIBEAATGLNγ-aminobutyric acid - اسید γ-آمینوبوتیریکkainic acid - اسید کرییکTaurine - تائورینEpileptic seizure - تشنج صرعNeuronal uptake - جذب نورونexcitatory amino acid transporter - حمل کننده آمینو اسید هیجان انگیزTau - خود راextracellular fluid - مایع خارج سلولیRat hippocampus - هیپوکامپ موش صحراییKainate - کیناتGABA - گاباGlu - گلوglutamate - گلوتاماتglutamine - گلوتامین
موضوعات مرتبط
علوم زیستی و بیوفناوری
علم عصب شناسی
عصب شناسی
چکیده انگلیسی
Rats were given unilateral kainate injection into hippocampal CA3 region, and the effect of chronic electrographic seizures on extracellular glutamine (GLNECF) was examined in those with low and steady levels of extracellular glutamate (GLUECF). GLNECF, collected by microdialysis in awake rats for 5 h, decreased to 62 ± 4.4% of the initial concentration (n = 6). This change correlated with the frequency and magnitude of seizure activity, and occurred in the ipsilateral but not in contralateral hippocampus, nor in kainate-injected rats that did not undergo seizure (n = 6). Hippocampal intracellular GLN did not differ between the Seizure and No-Seizure Groups. These results suggested an intriguing possibility that seizure-induced decrease of GLNECF reflects not decreased GLN efflux into the extracellular fluid, but increased uptake into neurons. To examine this possibility, neuronal uptake of GLNECF was inhibited in vivo by intrahippocampal perfusion of 2-(methylamino)isobutyrate, a competitive and reversible inhibitor of the sodium-coupled neutral amino acid transporter (SNAT) subtypes 1 and 2, as demonstrated by 1.8 ± 0.17 fold elevation of GLNECF (n = 7). The frequency of electrographic seizures during uptake inhibition was reduced to 35 ± 7% (n = 7) of the frequency in pre-perfusion period, and returned to 88 ± 9% in the post-perfusion period. These novel in vivo results strongly suggest that, in this well-established animal model of temporal-lobe epilepsy, the observed seizure-induced decrease of GLNECF reflects its increased uptake into neurons to sustain enhanced glutamatergic epileptiform activity, thereby demonstrating a possible new target for anti-seizure therapies.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Epilepsy Research - Volume 107, Issues 1â2, November 2013, Pages 20-36
Journal: Epilepsy Research - Volume 107, Issues 1â2, November 2013, Pages 20-36
نویسندگان
Keiko Kanamori, Brian D. Ross,