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Basal forebrain neurons modulate the synthesis and expression of neuropeptides in the rat suprachiasmatic nucleus.

Abstract：

:We tested the hypothesis that efferents from the nucleus basalis magnocellularis (NBM) play a direct role in the regulation of neuropeptide synthesis and expression by neurons of the rat suprachiasmatic nucleus (SCN). Adult male rats in which the NBM was destroyed with quinolinic acid, either unilaterally or bilaterally, were compared with rats injected with physiological saline and with control rats. The estimators used to assess the effects of cholinergic deafferentation on the neuroanatomy and neurochemistry of the SCN were the total number of SCN neurons, the total number and somatic size of SCN neurons producing vasopressin (VP) and vasoactive intestinal polypeptide (VIP), and the respective mRNA levels. Bilateral destruction of the NBM did not produce cell death in the SCN, but caused a marked reduction in the number and somatic size of SCN neurons expressing VP and VIP, and in the mRNA levels of these peptides. The decrease in the number of VP- and VIP-producing neurons provoked by unilateral lesions was less striking than that resulting from bilateral lesions. It was, however, statistically significant in the ipsilateral hemisphere, but not in the contralateral hemisphere. The results show that the reduction of cholinergic inputs to the SCN impairs the synthesis, and thereby decreases the expression of neuropeptides by SCN neurons, and that the extent of the decline correlates with the amount of cholinergic afferents destroyed. This supports the notion that acetylcholine plays an important, and direct role in the regulation of the metabolic activity of SCN neurons.

journal_name

Neuroscience

journal_title

Neuroscience

authors

Madeira MD,Pereira PA,Silva SM,Cadete-Leite A,Paula-Barbosa MM

doi

10.1016/j.neuroscience.2004.03.005

keywords:

subject

Has Abstract

pub_date

2004-01-01 00:00:00

pages

889-901

issue

4

eissn

0306-4522

issn

1873-7544

pii

S0306452204001794

journal_volume

125

pub_type

杂志文章

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