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Journal of Neuroscience, Vol 15, 2063-2073, Copyright © 1995 by Society for Neuroscience
Cholinergic manipulations in the medial septal area: age-related effects on working memory and hippocampal electrophysiology
AL Markowska, DS Olton and B Givens
Department of Psychology, Johns Hopkins University, Baltimore, Maryland 21218-2686.
Aged rats have impairments in several types of cognitive functions,
including spatial working memory (WM), that are dependent upon the
septohippocampal cholinergic system. The present series of experiments was
designed to assess the effectiveness of pharmacological manipulations of
the medial septal area (MSA) in order to influence the physiology of the
septohippocampal pathway and, therefore, the brain functions in which this
pathway participates. Aged (22MO) and young (4MO) Fischer-344 rats received
microinfusions into the MSA with either saline, the muscarinic agonist,
oxotremorine (OXO), or the muscarinic antagonist, scopolamine (SCOP).
Working memory was tested in a T-maze spatial alternation task, prior to
infusion, immediately after infusion, and 90 min after infusion.
Hippocampal theta activity and the population excitatory postsynaptic
potential (pEPSP) of the dentate gyrus to perforant path stimulation were
recorded immediately following behavioral testing at each of the three time
periods. In 22MO rats, intraseptal OXO (0.5 micrograms, 2 micrograms, 5
micrograms) produced a dose-dependent improvement in choice accuracy, a
shift of the hippocampal theta peak to a lower frequency and a higher peak
power, and an increase in the initial slope of pEPSP. OXO, 0.1 microgram,
did not have an effect on behavior or hippocampal physiology and OXO, 10
micrograms, produced an impairment in performance. In 4MO rats, OXO did not
affect choice accuracy, nor the pEPSP slope, but altered hippocampal theta
peak frequency and power similarly as in 22MO. The lowest behaviorally
effective dose, 0.5 microgram OXO, did not influence WM performance when
infused into the lateral ventricles (intracerebroventricularly) of either
22MO or 4MO rats. SCOP (2 micrograms, 5 micrograms, 15 micrograms)
decreased choice accuracy in a dose-dependent fashion in both 22MO and 4MO
rats. However, in 22MO rats, the behavioral dose-response curve for
scopolamine was shifted towards greater sensitivity. SCOP produced a shift
of the hippocampal theta to a higher frequency and a lower peak power, and
a decrease in the initial slope of pEPSP. In 4MO rats, SCOP altered
hippocampal theta similarly to 22MO, but did not affect the pEPSP slope.
These results indicate that (1) cholinergic receptors in the MSA are a
useful target for drugs to improve WM in aging rats, (2) age-related
changes in the activity of the septohippocampal pathway may increase its
sensitivity to drugs which alter its activity, and (3) alterations in
hippocampal physiology may contribute differently to changes in WM in young
and in old rats.
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