Abstract：
:Previous studies showed that prolonged access to cocaine or heroin self-administration (long access, or LgA) produces an escalation in drug intake not observed with limited access to the drug (short access, or ShA). The present experiment employed in vivo microdialysis to test the role of alterations in drug pharmacokinetics and/or efficacy in increasing dopamine (DA) levels in the nucleus accumbens (NAcc) during cocaine intake escalation. In experiment 1, both ShA and LgA rats were challenged with passive intravenous administration of cocaine (0.125-1 mg/injection). Regardless of the doses tested, there was no difference between groups in the ability of cocaine to increase NAcc DA levels and no group differences in the temporal profile of dialysate cocaine levels. In experiment 2, cocaine and DA concentrations were measured during cocaine self-administration. Self-administration produced sustained increases of DA in the NAcc with LgA rats maintaining greater steady levels of DA (750% of baseline) than ShA rats (400% of baseline). The difference in the LgA versus ShA rats was not due to differences in the efficacy of cocaine to elevate DA levels, or in the rate of cocaine metabolism, but was directly related to the amount of self-administered cocaine. These findings show that changes in cocaine efficacy or pharmacokinetics do not play a critical role in cocaine intake escalation.
journal_name
J Neurochemjournal_title
Journal of neurochemistryauthors
Ahmed SH,Lin D,Koob GF,Parsons LHdoi
10.1046/j.1471-4159.2003.01833.xkeywords:
subject
Has Abstractpub_date
2003-07-01 00:00:00pages
102-13issue
1eissn
0022-3042issn
1471-4159pii
1833journal_volume
86pub_type
杂志文章abstract：:[3H]Spiroperidol binding to homogenates of rat striatum is saturable and shows either monophasic or biphasic saturation isotherms under specified conditions. In poorly washed membrane fragment preparations, saturation isotherms of [3H]spiroperidol binding are monophasic, revealing an apparently homogeneous set of site...
journal_title：Journal of neurochemistry
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doi：10.1111/j.1471-4159.1980.tb07865.x
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abstract：:Neurotensin modulates dopaminergic transmission in the nigrostriatal system. DARPP-32, a dopamine- and cAMP-regulated phosphoprotein of Mr 32 kDa, is phosphorylated on Thr34 by cAMP-dependent protein kinase, resulting in its conversion into a potent inhibitor of protein phosphatase-1 (PP 1). Here, we examined the effe...
journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1046/j.1471-4159.2002.00822.x
更新日期：2002-04-01 00:00:00
abstract：:The FE65 adaptor protein family was identified in two-hybrid screens as proteins that bind the cytoplasmic domain of the amyloid precursor protein (APP). Studies have shown that FE65 binding to APP modulates APP processing. Increased levels of alpha-secretase derived secreted APP (APPsalpha) and beta-amyloid (Abeta) w...
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pub_type： 杂志文章
doi：10.1046/j.1471-4159.1995.65031325.x
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journal_title：Journal of neurochemistry
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doi：10.1046/j.1471-4159.1999.0730641.x
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更新日期：2008-07-01 00:00:00
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更新日期：2005-11-01 00:00:00
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journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1111/j.1471-4159.1985.tb08803.x
更新日期：1985-05-01 00:00:00
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journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1046/j.1471-4159.1996.67062471.x
更新日期：1996-12-01 00:00:00
abstract：:beta-Amyloid peptide accumulates in the brain of patients affected by sporadic or familial forms of Alzheimer's disease. It derives from the proteolytic attacks of the beta-amyloid precursor protein (betaAPP) by beta- and gamma-secretase activities. An additional epsilon cleavage taking place a few residues C-terminal...
journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1111/j.1471-4159.2006.03748.x
更新日期：2006-05-01 00:00:00
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pub_type： 杂志文章
doi：10.1111/j.1471-4159.2008.05318.x
更新日期：2008-05-01 00:00:00
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journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1046/j.1471-4159.1996.66051851.x
更新日期：1996-05-01 00:00:00
abstract：:The zinc-finger transcription factor Yin Yang 1 (YY1) is a multifunctional protein that plays a critical role in embryonic development. Although it has been shown to play a role in eye development, its expression in the retina was not previously described. Here, we investigated YY1 expression in chicken tissues and we...
journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1111/j.1471-4159.2007.05150.x
更新日期：2008-05-01 00:00:00
abstract：:Purines are a class of small organic molecules that are essential for all cells. They play critical roles in neuronal differentiation and function. Their importance is highlighted by several inherited disorders of purine metabolism, such as Lesch-Nyhan disease, which is caused by a deficiency of the purine salvage enz...
journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1111/jnc.12366
更新日期：2013-12-01 00:00:00
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journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1046/j.1471-4159.1994.62062241.x
更新日期：1994-06-01 00:00:00
abstract：:Ischemic stroke is a neurovascular disease treatable by thrombolytic therapy, but the therapy has to be initiated within 3 h of the incident. This therapeutic limitation stems from the secondary injury which results mainly from oxidative stress and inflammation. A potent antioxidant/anti-inflammatory agent, caffeic ac...
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pub_type： 杂志文章
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更新日期：2007-07-01 00:00:00
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doi：10.1046/j.1471-4159.1995.64062396.x
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journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1111/j.1471-4159.1986.tb13048.x
更新日期：1986-03-01 00:00:00
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journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1111/j.1471-4159.1983.tb08125.x
更新日期：1983-06-01 00:00:00
abstract：:The transmission of pain signalling involves the cytoskeleton, but mechanistically this is poorly understood. We recently demonstrated that the capsaicin receptor TRPV1, a non-selective cation channel expressed by nociceptors that is capable of detecting multiple pain-producing stimuli, directly interacts with the tub...
journal_title：Journal of neurochemistry
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更新日期：2006-01-01 00:00:00
abstract：:Progressive supranuclear palsy (PSP) is a neurodegenerative movement disorder of unknown etiology. We hypothesized that mitochondrial DNA (mtDNA) aberration could occur in this disease and contribute to its pathogenesis. To address this we created transmitochondrial cytoplasmic hybrid (cybrid) cell lines expressing mi...
journal_title：Journal of neurochemistry
pub_type： 临床试验,杂志文章
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更新日期：2000-10-01 00:00:00
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journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1111/j.1471-4159.2004.02884.x
更新日期：2005-02-01 00:00:00
abstract：:Transamination of the branched-chain amino acids produces glutamate and branched-chain alpha-ketoacids. The reaction is catalyzed by branched-chain aminotransferase (BCAT), of which there are cytosolic and mitochondrial isoforms (BCATc and BCATm). BCATc accounts for 70% of brain BCAT activity, and contributes at least...
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pub_type： 杂志文章
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更新日期：2007-03-01 00:00:00
abstract：:Deposit of beta-amyloid protein (A beta) in Alzheimer's disease brain may contribute to the associated neurodegeneration. We have studied the neurotoxicity of A beta in primary cultures of murine cortical neurons, with the aim of identifying pharmacologic ways of attenuating the injury. Exposure of cultures to A beta ...
journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1046/j.1471-4159.1994.62010372.x
更新日期：1994-01-01 00:00:00
abstract：:Uptake of L-glutamine (2 mM) by rat brain cortex slices against a concentration gradient is markedly inhibited (40%) by branched-chain L-amino acids (1 mM), L-phenylalanine (1 mM), or L-methionine (1 mM); that of L-asparagine (2 mM) is much less affected by these amino acids. Other amino acids investigated have little...
journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1111/j.1471-4159.1980.tb12491.x
更新日期：1980-07-01 00:00:00
abstract：:The Coffin-Lowry syndrome, a rare syndromic form of X-linked mental retardation, is caused by loss-of-function mutations in the hRSK2 (RPS6KA3) gene. To further investigate RSK2 (90-kDa ribosomal S6 kinase) implication in cognitive processes, a mrsk2_KO mouse has previously been generated as an animal model of Coffin-...
journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1111/j.1471-4159.2008.05703.x
更新日期：2008-12-01 00:00:00
abstract：:To better understand metabotropic/ionotropic integration in neurons we have examined the regulation of M1 muscarinic acetylcholine (mACh) receptor signalling in mature (> 14 days in vitro), synaptically-active hippocampal neurons in culture. Using a protocol where neurons are exposed to an EC(50) concentration of the ...
journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1111/j.1471-4159.2007.04931.x
更新日期：2007-12-01 00:00:00
