کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5828667 1558979 2013 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Synthetic Aβ oligomers (Aβ1-42 globulomer) modulate presynaptic calcium currents: Prevention of Aβ-induced synaptic deficits by calcium channel blockers
موضوعات مرتبط
علوم زیستی و بیوفناوری علم عصب شناسی علوم اعصاب سلولی و مولکولی
پیش نمایش صفحه اول مقاله
Synthetic Aβ oligomers (Aβ1-42 globulomer) modulate presynaptic calcium currents: Prevention of Aβ-induced synaptic deficits by calcium channel blockers
چکیده انگلیسی
Alzheimer's disease is accompanied by increased brain levels of soluble amyloid-β (Aβ) oligomers. It has been suggested that oligomers directly impair synaptic function, thereby causing cognitive deficits in Alzheimer's disease patients. Recently, it has been shown that synthetic Aβ oligomers directly modulate P/Q-type calcium channels, possibly leading to excitotoxic cascades and subsequent synaptic decline. Using whole-cell recordings we studied the modulation of recombinant presynaptic calcium channels in HEK293 cells after application of a stable Aβ oligomer preparation (Aβ1-42 globulomer). Aβ globulomer shifted the half-activation voltage of P/Q-type and N-type calcium channels to more hyperpolarized values (by 11.5 and 7.5 mV). Application of non-aggregated Aβ peptides had no effect. We then analyzed the potential of calcium channel blockers to prevent Aβ globulomer-induced synaptic decline in hippocampal slice cultures. Specific block of P/Q-type or N-type calcium channels with peptide toxins completely reversed Aβ globulomer-induced deficits in glutamatergic neurotransmission. Two state-dependent low molecular weight P/Q-type and N-type calcium channel blockers also protected neurons from Aβ-induced alterations. On the contrary, inhibition of L-type calcium channels failed to reverse the deficit. Our data show that Aβ globulomer directly modulates recombinant P/Q-type and N-type calcium channels in HEK293 cells. Block of presynaptic calcium channels with both state-dependent and state-independent modulators can reverse Aβ-induced functional deficits in synaptic transmission. These findings indicate that presynaptic calcium channel blockers may be a therapeutic strategy for the treatment of Alzheimer's disease.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: European Journal of Pharmacology - Volume 702, Issues 1–3, 28 February 2013, Pages 44-55
نویسندگان
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