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Positively reinforcing effects of the neurokinin substance P in the basal forebrain: mediation by its C-terminal sequence.

Abstract：

:The conditioned corral preference paradigm was used to assess reinforcing effects of substance P (SP) and its N- and C-terminal fragments injected unilaterally into the region of the nucleus basalis magnocellularis (NBM) in rats. Behavioral testing was carried out in a circular open field, consisting of 4 quadrants equally preferred by the animals prior to conditioning. A single conditioning trial was performed. Rats received one microinjection (0.5 microliter) of SP (0.74 pmol), of the N-terminal fragment SP (1-7) and the C-terminal fragment analog DiMe-C7 (each at doses of 0.074, 0.74, and 74 pmol), or vehicle (phosphate-buffered saline; PBS). After injection the rats were placed into the open field with the four quadrants being separated by Plexiglas barriers (closed corral). During the test for conditioned corral preference, when provided a choice between the four quadrants, only those rats injected with SP and the equimolar dose of DiMe-C7 (0.74 pmol) spent more time in the treatment corral, indicative of a positively reinforcing action. None of the other doses of DiMe-C7 and of SP(1-7) influenced the preference behavior. For rats injected with 0.74 pmol SP, SP (1-7), and DiMe-C7, a behavioral analysis was performed for the 15 min conditioning trial. SP and DiMe-C7 reduced rearing and grooming behavior, whereas DiMe-C7 and SP(1-7) increased locomotor activity. However, the acute behavioral effects of SP and its fragments were not correlated with the subsequent place preference behavior during the test trial. The results are discussed in the framework of a structure/activity relationship for the positively reinforcing properties of SP in the region of the NBM. Furthermore, neuropathological implications of the present data are considered, since the homologous nucleus basalis of Meynert in man is known to degenerate in Alzheimer's disease, which is characterized behaviorally by a progressive deterioration in associative functioning.

journal_name

Exp Neurol

journal_title

Experimental neurology

authors

Hasenöhrl RU,Gerhardt P,Huston JP

doi

10.1016/0014-4886(92)90063-v

keywords:

subject

Has Abstract

pub_date

1992-02-01 00:00:00

pages

282-91

issue

2

eissn

0014-4886

issn

1090-2430

pii

0014-4886(92)90063-V

journal_volume

115

pub_type

杂志文章

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