Abstract：
:Entrainment of the dominant circadian pacemaker localised to the hypothalamic suprachiasmatic nuclei (SCN) is mediated partially via the indirect retino-geniculo-hypothalamic projection to the SCN, which is presumed to utilise enkephalin and other neurotransmitters, to modulate circadian rhythmicity. In the present study, we have investigated electrophysiologically the currently unknown functional effects of enkephalin, and another opioid receptor agonist morphine, on hamster SCN neuronal activity in vitro. Basal or N-methyl-D-aspartate-evoked firing rates of SCN neurones were generally unresponsive (86%) to the opioid receptor agonists leucine-enkephalin, methionine-enkephalin, or morphine. Washout of the enkephalins or morphine resulted in a rebound excitatory response ("withdrawal activation") in 39% of neurones tested. Withdrawal activation was also elicited by administration of the opioid receptor antagonist naloxone, following pre-exposure to morphine, in 59% of neurones tested. These withdrawal responses were blocked or attenuated by the alpha2-adrenoceptor agonist clonidine, results which suggest a functional interaction exists between opioid receptors and alpha2-adrenoceptors in the SCN. Our observations show that opioid receptor agonists are largely devoid of actions on normal hamster SCN circadian pacemaker activity, while the occurrence of withdrawal responses may have implications on circadian function during withdrawal from opiate abuse.
journal_name
Brain Res Bulljournal_title
Brain research bulletinauthors
Cutler DJ,Mundey MK,Mason Rdoi
10.1016/s0361-9230(99)00069-6keywords:
subject
Has Abstractpub_date
1999-09-15 00:00:00pages
119-25issue
2eissn
0361-9230issn
1873-2747pii
S0361-9230(99)00069-6journal_volume
50pub_type
杂志文章abstract：:The impact of diabetes and especially hyperglycemia on brain glucose utilization and insulin binding are still not clear. This is probably due to the fact that most studies have been performed in streptozotocin treated rats that are highly hyperglycemia and that could have an effect per se on the brain. The aim of the...
journal_title：Brain research bulletin
pub_type： 杂志文章
doi：10.1016/0361-9230(95)00060-r
更新日期：1995-01-01 00:00:00
abstract：:Excitatory amino acid transporters (EAATs) represent a group of high affinity glutamate transporters that are involved in the regulation of extracellular glutamate levels at glutamatergic synapses. EAAT proteins have been found on neurons as well as on glia cells where they act synergistically to remove the released g...
journal_title：Brain research bulletin
pub_type： 杂志文章
doi：10.1016/j.brainresbull.2010.04.018
更新日期：2010-10-30 00:00:00
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journal_title：Brain research bulletin
pub_type： 杂志文章
doi：10.1016/0361-9230(91)90178-m
更新日期：1991-05-01 00:00:00
abstract：:Our previous results showed that neurochemical destruction of the amygdaloid terminal field of the mesolimbic dopaminergic system caused disturbances in body weight regulation and feeding. In the present experiments, it was studied whether 6-hydroxydopamine (6-OHDA)-induced bilateral lesions of the mesolimbic dopamine...
journal_title：Brain research bulletin
pub_type： 杂志文章
doi：10.1016/0361-9230(91)90125-4
更新日期：1991-09-01 00:00:00
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journal_title：Brain research bulletin
pub_type： 杂志文章
doi：10.1016/j.brainresbull.2006.05.008
更新日期：2006-07-31 00:00:00
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journal_title：Brain research bulletin
pub_type： 杂志文章
doi：10.1016/0361-9230(88)90158-x
更新日期：1988-09-01 00:00:00
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journal_title：Brain research bulletin
pub_type： 杂志文章
doi：10.1016/j.brainresbull.2008.11.005
更新日期：2009-03-16 00:00:00
abstract：:Ten years after the discovery of human diseases caused by trinucleotide repeat expansions, searching for mechanistic links between gene mutation and pathological phenotype remains a fundamental and unsolved issue. Evidence accumulated so far indicates that the pathogenesis of repeat disorders is complex and multi-fact...
journal_title：Brain research bulletin
pub_type： 杂志文章,评审
doi：10.1016/s0361-9230(01)00651-7
更新日期：2001-10-01 00:00:00
abstract：:The projections from the rat medial prefrontal cortex to the amygdaloid complex were investigated using retrograde transport of fluorescent dyes and anterograde transport of horseradish peroxidase-WGA. The ventral anterior cingulate, prelimbic, infralimbic and medial orbital areas and the taenia tecta were found to pr...
journal_title：Brain research bulletin
pub_type： 杂志文章
doi：10.1016/0361-9230(86)90237-6
更新日期：1986-09-01 00:00:00
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journal_title：Brain research bulletin
pub_type： 杂志文章
doi：10.1016/0361-9230(86)90017-1
更新日期：1986-01-01 00:00:00
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journal_title：Brain research bulletin
pub_type： 杂志文章
doi：10.1016/j.brainresbull.2007.09.005
更新日期：2008-03-28 00:00:00
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journal_title：Brain research bulletin
pub_type： 杂志文章
doi：10.1016/j.brainresbull.2008.12.015
更新日期：2009-04-06 00:00:00
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journal_title：Brain research bulletin
pub_type： 杂志文章
doi：10.1016/j.brainresbull.2012.01.004
更新日期：2012-03-10 00:00:00
abstract：:Administration of methionine enkephalin (ICV) to rats for 5 days resulted in the development of physical dependence as exemplified by a hypothermic response which peaked 2-8 hours after initiation of withdrawal. Twenty-four hours post-withdrawal, opioid receptor binding was determined in the striatum using a selective...
journal_title：Brain research bulletin
pub_type： 杂志文章
doi：10.1016/0361-9230(86)90123-1
更新日期：1986-08-01 00:00:00
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journal_title：Brain research bulletin
pub_type： 杂志文章
doi：10.1016/j.brainresbull.2007.10.008
更新日期：2008-03-28 00:00:00
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journal_title：Brain research bulletin
pub_type： 杂志文章
doi：10.1016/0361-9230(91)90199-t
更新日期：1991-01-01 00:00:00
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journal_title：Brain research bulletin
pub_type： 评论,杂志文章
doi：10.1016/j.brainresbull.2007.12.002
更新日期：2008-03-28 00:00:00
abstract：:Unilateral injections of 6-hydroxydopamine (6-OHDA) cause significant bilateral increases in striatal proenkephalin (PEK) mRNA in rat brain. We have tested the possibility that implantation of fetal mesencephalic cells can normalize these changes. Two types of grafts were used: 1) embryonic day-15 mesencephalic cells ...
journal_title：Brain research bulletin
pub_type： 杂志文章
doi：10.1016/0361-9230(91)90050-t
更新日期：1991-11-01 00:00:00
abstract：:Effects of hypothalamic stimulation and lesion on hepatic autonomic nerve activity were investigated in anesthetized rats. Stimulation of the lateral hypothalamic area increased activity of the hepatic vagal nerve and decreased activity of the splanchnic nerve. Lesion of this area produced a rapid and strong reduction...
journal_title：Brain research bulletin
pub_type： 杂志文章
doi：10.1016/0361-9230(88)90237-7
更新日期：1988-08-01 00:00:00
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journal_title：Brain research bulletin
pub_type： 杂志文章
doi：10.1016/j.brainresbull.2011.03.025
更新日期：2011-07-15 00:00:00
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journal_title：Brain research bulletin
pub_type： 杂志文章
doi：10.1016/s0361-9230(99)00278-6
更新日期：2000-04-01 00:00:00
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journal_title：Brain research bulletin
pub_type： 杂志文章
doi：10.1016/0361-9230(90)90049-6
更新日期：1990-11-01 00:00:00
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journal_title：Brain research bulletin
pub_type： 杂志文章
doi：10.1016/s0361-9230(02)00821-3
更新日期：2002-09-15 00:00:00
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journal_title：Brain research bulletin
pub_type： 杂志文章
doi：10.1016/s0361-9230(01)00438-5
更新日期：2001-01-15 00:00:00
abstract：:Inhibition of glycolysis and fatty acid oxidation by combined treatment with 2-deoxyglucose (2DG) and methyl palmoxirate, or inhibition of glycolysis and lipolysis by combined treatment with 2DG and nicotonic acid synergistically increased food intake in rats. Methyl palmoxirate treatment alone increased food intake i...
journal_title：Brain research bulletin
pub_type： 杂志文章
doi：10.1016/0361-9230(86)90099-7
更新日期：1986-12-01 00:00:00
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journal_title：Brain research bulletin
pub_type： 杂志文章
doi：10.1016/s0361-9230(01)00751-1
更新日期：2002-03-15 00:00:00
abstract：:Orexin/hypocretin neurons of the lateral hypothalamus/perifornical area project to a diverse array of brain regions and are responsive to a variety of psychostimulant drugs. It has been shown that orexin neurons are activated by systemic nicotine administration suggesting a possible orexinergic contribution to the eff...
journal_title：Brain research bulletin
pub_type： 杂志文章
doi：10.1016/j.brainresbull.2008.09.014
更新日期：2008-12-16 00:00:00
abstract：:In humans, perturbations in the developmental neuronal death leading to an excess of neurons could be associated with developmental neuropsychiatric disorders. Hu-bcl-2 transgenic mice appear to be a valuable tool to study the functional role of developmental programmed cell death. Indeed, the over-expression of the a...
journal_title：Brain research bulletin
pub_type： 杂志文章
doi：10.1016/s0361-9230(01)00639-6
更新日期：2002-01-01 00:00:00
abstract：:Age-related macular degeneration (AMD) is the leading cause of irreversible blindness in people over 60 years of age in the US and many other developed countries. Increasingly sophisticated methods for the diagnosis and treatment of macular degeneration are not effective for the majority of patients in whom late stage...
journal_title：Brain research bulletin
pub_type： 杂志文章,评审
doi：10.1016/S0361-9230(03)00072-8
更新日期：2004-02-15 00:00:00
abstract：:Unit activities of thermosensitive (TS) and non-TS neurons in the medial preoptic area (MPO) of the monkey were investigated during a high fixed-ratio (FR 12-30) bar press behavior to seek cool air (CT) in a warm environment. The monkey performed the task when ambient temperature (Ta) was raised (35-43 degrees C) and ...
journal_title：Brain research bulletin
pub_type： 杂志文章
doi：10.1016/0361-9230(87)90134-1
更新日期：1987-05-01 00:00:00
