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- W2018698363 abstract "The effects of β-amyloid peptide25–35 on resting membrane potential, spontaneous and evoked action potential and synaptic activity have been studied in basolateral amygdaloid complex on slices obtained from adult rats. Intracellular recordings reveal that perfusion with β-amyloid peptide25–35 at concentrations of 400 nM and less did not generate any effect on resting membrane potential. However, concentrations in the range of 800–1200 nM produced an unpredictable effect, depolarization and/or hyperpolarization, which were blocked by tetrodotoxin or 6-cyano-7-nitroquinoxaline-2,3-dione + d-(−)-2-amino-5-phosphonopentanoic acid together with bicuculline. Excitatory and inhibitory evoked responses mediated by glutamic acid or γ-aminobutyric acid decreased in amplitude after β-amyloid peptide25–35 perfusion. Additionally, results obtained using the paired-pulse protocol offer support for a presynaptic mode of action. To determine which type of receptors and/or channels are involved in the presynaptic mechanism of action, a specific blocker of alpha-7 nicotinic receptors (methyllycaconitine citrate) or L-type calcium channel blockers (calcicludine or nifedipine) were used. β-amyloid petide25–35 decreased excitatory postsynaptic potentials amplitude in control conditions and also in slices permanently perfused with methyllycaconitine citrate. However, this effect was blocked in slices perfused with calcicludine or nifedipine suggesting the involvement of the L-type calcium channels. On the whole, these experiments provide evidence that β-amyloid peptide25–35 affects neurotransmission in basolateral amygdala and its action is mediated through L-type calcium channels." @default.
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- W2018698363 date "2005-04-01" @default.
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- W2018698363 title "β-Amyloid peptide25–35 depresses excitatory synaptic transmission in the rat basolateral amygdala “in vitro”" @default.
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- W2018698363 doi "https://doi.org/10.1016/j.neurobiolaging.2004.05.008" @default.
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