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Concurrent elevation of the levels of expression of striatal preproenkephalin and preprodynorphin mRNA in the rat brain by chronic treatment with caffeine.

Abstract：

:Caffeine is a widely consumed substance that elicits psychomotor stimulant effects and also displays addictive properties. In order to assess the effect of caffeine on striatal neuropeptide mRNA expression, male rats were injected (i.p.) with caffeine at 20, 40 or 80 mg/kg of body weight twice daily for 9 consecutive days. Preproenkephalin (PPE), preprotachykinin A (PPT-A) and preprodynorphin (PPD) mRNA levels were determined in coronal sections of brain tissue by in situ hybridization histochemistry. PPE mRNA levels were increased by chronic caffeine in all subdivisions of the striatum at 80 mg/kg (dorsolateral caudate-putamen (dlCPu), +139%; dorsomedial CPu (dmCPu), +42%; ventrolateral CPu (vlCPu), +102%; ventromedial CPu (vmCPu), +20%; and anterior CPu (aCPu), +75% relative to vehicle-injected controls that were normalized to 0% change). Similarly, PPD mRNA expression was increased in all aspects of the striatum at 80 mg/kg (dlCPu, dmCPu, vlCPu, vmCPu and aCPu, +98%, +25%, +104%, +9% and +85%, respectively). In contrast to PPE mRNA, PPD mRNA was increased +117% above control in the nucleus accumbens (NAc) at 20 mg/kg of caffeine. PPT-A mRNA expression was not significantly affected by caffeine treatment in the CPu or NAc. The data demonstrate that repeated exposure to caffeine selectively increases opioid neuropeptide mRNA expression in the striatum and the NAc of the rat brain by a dopamine-independent mechanism.

journal_name

Neurosci Lett

journal_title

Neuroscience letters

authors

Datta U,Noailles PA,Kraft M,Zhang Y,Angulo JA

doi

10.1016/s0304-3940(97)00526-0

subject

Has Abstract

pub_date

1997-08-01 00:00:00

pages

29-32

issue

1

eissn

0304-3940

issn

1872-7972

pii

S0304-3940(97)00526-0

journal_volume

231

pub_type

杂志文章

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