Effects of intraseptally injected noradrenergic drugs on hippocampal sodium-dependent-high-affinity-choline-uptake in ‘resting’ and ‘trained’ mice

doi:10.1016/0006-8993(94)90325-5

Brain Research

Volume 652, Issue 1, 25 July 1994, Pages 120-128

https://doi.org/10.1016/0006-8993(94)90325-5 Get rights and content

Abstract

It has been shown in numerous studies that memory testing can alter presynaptic cholinergic activity within the hippocampus. In the present experiments, the role of the noradrenergic input to the septal cholinergic neurons in the immediate increase in cholinergic activity induced by the first training session of a spatial reference memory task in an 8-arm radial maze was investigated. The effects of bilateral intraseptal injections of noradrenergic drugs on hippocampal sodium-dependent-high-affinity-choline-uptake (SDHACU) were studied in ‘resting’ animals (basal level) or in ‘trained’ animals injected 20 min before training and sacrificed immediately after the test. The results showed that: (1) the injection of maprotiline, a noradrenaline 3euptake inhibitor (0.06 ng/site), induced an increase in hippocampal SDHACU in ‘resting’ animals, whereas the α₂-adrenoceptor agonist UK 14304 (1.5 ng) significantly reduced the basal level of SDHACU; (2) none of the α-adrenoceptor antagonists used (phenoxybenzamine, 10 and 100 ng; BE 2254, 100 and 500 ng; yohimbine, 0.5 and 50 ng) significantly affected the basal level of hippocampal SDHACU, and only the α₁-adrenoceptor antagonist BE 2254 (500 ng) significantly reduced the testing-induced activation of SDHACU. Taken together, these findings suggest that noradrenaline may exert a bimodal regulatory influence on the activity of septo-hippocampal cholinergic neurons. The behavior-induced activation of hippocampal SDHACU could be partly mediated by the stimulation of α₁-adrenoceptors, whereas postsynaptic α₂-adrenoceptors may be important for the maintenance of a tonic inhibition of the steady-state cholinergic activity in the hippocampus. These results are further evidence for a regulatory noradrenergic influence on the activity of septal cholinergic neurons.

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Effects of intraseptally injected noradrenergic drugs on hippocampal sodium-dependent-high-affinity-choline-uptake in ‘resting’ and ‘trained’ mice

Abstract

Neuroscience

Behav. Brain Res.

Neuropharmacology

Life Sci.

Behav. Neural. Biol.

Behav. Neural Biol.

Life Sci.

Pharmacol. Biochem. Behav.

Brain Res.

Behav. Brain Res.

Neuroscience

Trends Neurosci.

Behav. Brain Res.

Neurobiol. Aging

Behav. Brain Res.

Neurobiol. Aging

Brain Res.

Trends Neurosci.

Neurobiol. Aging

Brain Res.

Neurobiol. Aging

Brain Res.

Pharmacol. Biochem. Behav.

Behav. Brain Res.

Naunyn-Schmiedeberg's Arch. Pharmacol.

J. Pharmacol. Exp. Ther.

Brain Res.

Brain Res.

J. Neurosci.

Exp. Brain Res.

Neuroscience

Neuropharmacology

Behav. Brain Res.