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Arginine vasopressin gene expression changes within the nucleus accumbens during environment elicited cocaine-conditioned response in rats.

Abstract：

:It is known that changes in gene expression within the nucleus accumbens (NAc) occur during cocaine dependence development. However, identification of specific genes involved in cocaine conditioning awaits further investigation. We conducted a high throughput gene expression profile analysis of the NAc, during different stages of the environment-elicited cocaine conditioning. Rats were assigned to two different environmental conditions. Cocaine conditioned group received a cocaine injection (10mg/kg, i.p.) prior to being placed in the activity chambers. Control rats received saline injections before being exposed to their environment. Both groups received a saline injection in their home cage. Conditioning training lasted for 10 days. Animals were then re-exposed to their previously paired environments only on day 12 (test session). We found that the gene for arginine vasopressin (AVP) was differentially expressed on experimental subjects during all stages of environment-elicited cocaine conditioning. To further validate our molecular results, biochemical and immunolocalization experiments were conducted. We found the presence of AVP within accumbal fibers and changes in AVP protein levels following cocaine conditioning. Moreover, we tested the effects of accumbal microinfusions of either AVP receptor V(1A) agonist [pGlu(4), Cyt6, Arg(8)] AVP 4-9 1.0 ng/0.5 microl, or V(1A) antagonist (CH2) 5[Tyr (Me) 2] AVP, 1.0 ng/0.5 microl or vehicle solution (0.9% saline solution) during different stages of the cocaine conditioning. Blockade of V(1A) receptors within the NAc during acquisition interrupted the expression of the conditioned response, while activation leads to an increase in this response. Our findings propose a new role for AVP in cocaine addiction.

journal_name

Neuropharmacology

journal_title

Neuropharmacology

authors

Rodríguez-Borrero E,Rivera-Escalera F,Candelas F,Montalvo J,Muñoz-Miranda WJ,Walker JR,Maldonado-Vlaar CS

doi

10.1016/j.neuropharm.2009.06.040

subject

Has Abstract

pub_date

2010-01-01 00:00:00

pages

88-101

issue

1

eissn

0028-3908

issn

1873-7064

pii

S0028-3908(09)00204-4

journal_volume

58

pub_type

杂志文章

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