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C-fos mediates cocaine inhibition of NGF-induced PC12 cell differentiation.

Abstract：

:In utero cocaine exposure can affect CNS development. Previous studies showed that cocaine inhibits neuronal differentiation in a dose-dependent fashion, in nerve growth factor (NGF)-stimulated PC12 cells, without affecting cell viability. NGF activates intracellular signaling proteins, specific immediate-early genes (IEG) including a transient peak of c-fos expression, and induction of late genes expression, leading to the neuronal phenotype. We hypothesized that cocaine interferes with NGF signaling. Therefore, we examined the pattern of c-fos expression in our cellular model. Time course of c-fos expression up to 72 h was determined in cells treated with NGF 20 ng/ml and cocaine 10 microgram/ml (a moderately toxic level) by RT-PCR analysis. Total RNA was isolated from cells, and levels of c-fos mRNA were estimated using gene-specific primers. In both control and experimental conditions, c-fos level was maximal at 0.5 h. In the control cells, c-fos expression declined rapidly to less than 5% of the 0.5h value, while in the cocaine-treated cells, c-fos level persisted through the 72-h exposure. Adding c-fos antisense to cells treated with NGF and cocaine resulted in significant improvement of neurite out-growth, from 28% (NGF + cocaine) to 89% (NGF + cocaine + c-fos antisense) of control differentiation after 72 h of exposure (Dunnet's T < 3.24). Inhibitory effects of cocaine on NGF-induced PC12 differentiation may be attributed to alteration of c-fos expression. Further studies will be required to examine the role of D1 receptor activation in mediating c-fos expression and to explore the effects of cocaine on other IEGs.

journal_name

Mol Genet Metab

journal_title

Molecular genetics and metabolism

authors

Zachor DA,Moore JF,Jin J,Theibert AB,Percy AK

doi

10.1006/mgme.1998.2699

subject

Has Abstract

pub_date

1998-05-01 00:00:00

pages

62-9

issue

1

eissn

1096-7192

issn

1096-7206

pii

S1096-7192(98)92699-3

journal_volume

64

pub_type

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