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Changes in rat frontal cortex gene expression following chronic cocaine.
Willard M Freeman1, Karen Brebner, Wendy J Lynch
1Center for the Neurobiological Investigation of Drug Abuse, Department of Physiology and Pharmacology, Wake Forest University School of Medicine, Medical Center Boulevard, Winston-Salem, NC 27157-1083, USA. freemanw@ohsu.edu
Brain Research. Molecular Brain Research
|July 16, 2002
Summary
Repeated cocaine use alters gene expression in the frontal cortex, impacting brain function and behavior. This study identified key protein changes, including PYK2 and ARC, linked to cocaine abuse.
Area of Science:
- Neuroscience
- Molecular Biology
- Pharmacology
Background:
- Repeated cocaine administration is linked to long-term behavioral changes in cocaine abuse.
- The frontal cortex plays a crucial role in executive functions and the mesolimbic dopamine system.
- Cocaine-induced alterations in frontal cortex gene expression may underlie behavioral modifications.
Purpose of the Study:
- To investigate changes in gene expression within the frontal cortex following repeated cocaine administration.
- To identify specific proteins and mRNA levels affected by a binge model of cocaine exposure.
- To validate the use of cDNA hybridization arrays and protein quantification for studying neuronal gene expression.
Main Methods:
- Rats were administered a binge model of cocaine (45 mg/kg/day, i.p.) for 14 days.
- Messenger RNA (mRNA) abundance in the frontal cortex was screened using cDNA hybridization arrays.
- Protein levels of specific targets (PYK2, ARC, NGFI-B-RA) were measured using immunoblots.
- Real-time RT-PCR was employed to confirm changes in NGFI-B mRNA levels.
Main Results:
- Significant induction of protein tyrosine kinase 2 (PYK2), activity-regulated cytoskeletal protein (ARC), and NGFI-B-RA was observed after cocaine administration.
- Cocaine administration led to increased levels of NGFI-B mRNA, confirmed by real-time RT-PCR.
- These findings represent novel cocaine-responsive gene expression changes within the frontal cortex.
Conclusions:
- Repeated cocaine administration induces specific changes in gene and protein expression in the frontal cortex.
- The identified molecular alterations may contribute to the long-term behavioral effects of cocaine abuse.
- cDNA hybridization arrays and immunoblotting are effective tools for screening and confirming neuronal gene expression changes.