Abstract:
RATIONALE:Repeated exposure to psychostimulant drugs causes a long-lasting increase in the psychomotor and reinforcing effects of these drugs and an array of neuroadaptations. One such alteration is a hypersensitivity of striatal activity such that a low dose of amphetamine in sensitized animals produces dorsal striatal activation patterns similar to acute treatment with a high dose of amphetamine. OBJECTIVES:To extend previous findings of striatal hypersensitivity with behavioral observations and with cellular activity in the nucleus accumbens and prefrontal cortex in sensitized animals. MATERIALS AND METHODS:Rats treated acutely with 0, 1, 2.5, or 5 mg/kg i.p. amphetamine and sensitized rats challenged with 1 mg/kg i.p. amphetamine were scored for stereotypy, rearing, and grooming, and locomotor activity recorded. c-fos positive nuclei were quantified in the nucleus accumbens and prefrontal cortex after expression of sensitization with 1 mg/kg i.p. amphetamine. RESULTS:Intense stereotypy was seen in animals treated acutely with 5 mg/kg amphetamine, but not in the sensitized group treated with 1 mg/kg amphetamine. The c-fos response to amphetamine in the accumbens core was augmented in amphetamine-pretreated animals with a shift in the distribution of optical density, while no effect of sensitization was seen in the nucleus accumbens shell or prefrontal cortex. CONCLUSIONS:A lack of stereotypy in the sensitized group indicates a dissociation of behavioral responses to amphetamine and striatal immediate-early gene activation patterns. The increase in c-fos positive nuclei and shift in the distribution of optical density observed in the nucleus accumbens core suggests recruitment of a new population of neurons during expression of sensitization.
journal_name
Psychopharmacology (Berl)journal_title
Psychopharmacologyauthors
Nordquist RE,Vanderschuren LJ,Jonker AJ,Bergsma M,de Vries TJ,Pennartz CM,Voorn Pdoi
10.1007/s00213-008-1100-4subject
Has Abstractpub_date
2008-05-01 00:00:00pages
113-26issue
1eissn
0033-3158issn
1432-2072journal_volume
198pub_type
杂志文章abstract::The relationship between nicotine yield as determined by the FTC method and nicotine absorption was examined in 72 smokers in a more rigorous repetition of a previous study of 33 smokers. For this study, 113 smokers evenly distributed across four FTC "tar" yield ranges were recruited, only 72 demonstrated reasonable c...
journal_title:Psychopharmacology
pub_type: 临床试验,杂志文章
doi:10.1007/s002130050720
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abstract::Shaking movements of the body, similar to that made by a dog when wet ('wet-dog shakes'), occur in rats in response to pharmacological stimuli and in response to stimuli associated with cold and skin irritation. In this study, shaking movements, elicited by a variety of stimuli, were inhibited by central administratio...
journal_title:Psychopharmacology
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journal_title:Psychopharmacology
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pub_type: 杂志文章,随机对照试验
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journal_title:Psychopharmacology
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journal_title:Psychopharmacology
pub_type: 杂志文章
doi:10.1007/BF00429014
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更新日期:1990-01-01 00:00:00
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更新日期:2002-06-01 00:00:00
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更新日期:2015-08-01 00:00:00
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更新日期:2005-08-01 00:00:00
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更新日期:1998-06-01 00:00:00