Abstract:
:As nicotinic acetylcholine receptor (nAChR) agonists directly address cholinergic neurotransmission with potential impact on glutamatergic function, they are considered as potential new symptomatic treatment options for Alzheimer's disease compared to the indirectly operating acetylcholinesterase inhibitors such as the current gold standard donepezil. In order to evaluate the therapeutic value of nAChR activation to ameliorate cognitive dysfunction, a direct comparison between α4β2, α7 nAChR agonists, and donepezil was performed on the level of an ex vivo experimental model of impaired memory formation. First, we demonstrated that amyloid beta (Aβ)42 oligomers, which are believed to be the synaptotoxic Aβ-species causally involved in the pathophysiology of Alzheimer's disease, have a detrimental effect on long-term potentiation (LTP) in the CA1 region of rat hippocampal slices, a widely used cellular model of learning and memory. Second, we investigated the potential of donepezil, the α4β2 nAChR agonist TC-1827 and the α7 nAChR partial agonist SSR180711 to reverse Aβ42 oligomer induced LTP impairment. Donepezil showed only a slight reversal of Aβ42 oligomer induced impairment of early LTP, and had no effect on Aβ42 oligomer induced impairment of late LTP. The same was demonstrated for the α4β2 nAChR agonist TC-1827. In contrast, the α7 nAChR partial agonist SSR180711 completely rescued early as well as late LTP impaired by Aβ42 oligomers. As activating α7 nAChRs was found to be most efficacious in restoring Aβ42 oligomer induced LTP deficits, targeting α7 nAChRs might represent a powerful alternative approach for symptomatic treatment of AD.
journal_name
Brain Res Bulljournal_title
Brain research bulletinauthors
Kroker KS,Moreth J,Kussmaul L,Rast G,Rosenbrock Hdoi
10.1016/j.brainresbull.2013.04.006subject
Has Abstractpub_date
2013-07-01 00:00:00pages
28-38eissn
0361-9230issn
1873-2747pii
S0361-9230(13)00072-5journal_volume
96pub_type
杂志文章abstract::In brainstem slices of male rats, we examined in single neurons of the medial vestibular nucleus (MVN) the effect of exogenous administration of estrogenic (17β-estradiol, E2) and androgenic (5α-dihydrotestosterone, DHT) steroids on the synaptic response to vestibular afferent stimulation. By whole cell patch clamp re...
journal_title:Brain research bulletin
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doi:10.1016/j.brainresbull.2013.05.006
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journal_title:Brain research bulletin
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pub_type: 杂志文章
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journal_title:Brain research bulletin
pub_type: 杂志文章
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journal_title:Brain research bulletin
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journal_title:Brain research bulletin
pub_type: 杂志文章,评审
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journal_title:Brain research bulletin
pub_type: 杂志文章
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journal_title:Brain research bulletin
pub_type: 杂志文章
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journal_title:Brain research bulletin
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journal_title:Brain research bulletin
pub_type: 传,历史文章,杂志文章,评审
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journal_title:Brain research bulletin
pub_type: 杂志文章
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