کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4342230 | 1295860 | 2006 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Reversal of supersensitive striatal dopamine D1 receptor signaling and extracellular signal-regulated kinase activity in dopamine-deficient miceâ
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کلمات کلیدی
dopamine D1-receptorPBSIEGDBH6-HydroxydopamineERKD1RD2R6-OHDAl-DOPA - L-DOPAMAPK - MAPKStriatum - استریاتومParkinson’s disease - بیماری پارکینسونtyrosine hydroxylase - تیروزین هیدروکسیلازSupersensitivity - حساسیت بالاPhosphate-buffered saline - محلول نمک فسفات با خاصیت بافریmitogen-activated protein kinase - پروتئین کیناز فعال با mitogenimmediate early gene - ژن فوری اولیهextracellular signal-regulated kinase - کیناز تنظیم شده سیگنال خارج سلولیextracellular receptor kinase - کیناز گیرنده خارج سلولیDopamine receptor - گیرنده دوپامینdopamine D2 receptor - گیرنده دوپامین D2
موضوعات مرتبط
علوم زیستی و بیوفناوری
علم عصب شناسی
علوم اعصاب (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Lesions of dopaminergic nigrostriatal neurons cause supersensitivity to dopamine in the striatum. Previous work has shown that such supersensitivity, an important aspect of rodent models of Parkinson's disease, is associated with anatomically abnormal patterns in the activation of extracellular signal-regulated kinase. After lesions of dopaminergic neurons, dopamine D1-receptor agonists activate extracellular signal-regulated kinase in the dorsal striatum, something not observed in intact animals. Here we used a more selective method of dopamine depletion. Dopamine-deficient mice, in which the tyrosine hydroxylase gene is specifically inactivated in dopaminergic neurons, were used to investigate dopamine D1-receptor-mediated activation of extracellular signal-regulated kinase. In wild-type mice, acute treatment with a dopamine D1-receptor agonist results in activation of extracellular signal-regulated kinase in the nucleus accumbens without activation in the dorsal striatum. In contrast, in dopamine-deficient mice, dopamine D1-receptor-agonist treatment results in activation of extracellular signal-regulated kinase not only in the nucleus accumbens, but also throughout most of the dorsal striatum. Chronic replacement of dopamine by repeated injection of l-DOPA for 36 h reverses this supersensitive extracellular signal-regulated kinase activation. This reversal displays a dorsal to ventral progression such that, by 36 h, extracellular signal-regulated kinase activation is virtually restricted to the nucleus accumbens, as in wild-type mice. The reversal of dopamine D1-receptor activation of extracellular signal-regulated kinase in dopamine-deficient mice following chronic l-DOPA treatment shows that the lack of dopamine, rather than absence of other factors secreted from dopaminergic neurons, is responsible for dopamine supersensitivity.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Neuroscience - Volume 137, Issue 4, 2006, Pages 1381-1388
Journal: Neuroscience - Volume 137, Issue 4, 2006, Pages 1381-1388
نویسندگان
D.S. Kim, R.D. Palmiter, A. Cummins, C.R. Gerfen,