Cardiff University | Prifysgol Caerdydd ORCA
Online Research @ Cardiff 
WelshClear Cookie - decide language by browser settings

Ras-Guanine Nucleotide-Releasing Factor 1 (Ras-GRF1) controls activation of Extracellular Signal-Regulated Kinase (ERK) signaling in the striatum and long-term behavioral responses to cocaine

Fasano, Stefania, D'Antoni, A., Orban, P. C., Valjent, E., Putignano, E., Vara, H., Pizzorusso, T., Giustetto, M., Yoon, B., Soloway, P., Maldonado, R., Caboche, J. and Brambilla, Riccardo 2009. Ras-Guanine Nucleotide-Releasing Factor 1 (Ras-GRF1) controls activation of Extracellular Signal-Regulated Kinase (ERK) signaling in the striatum and long-term behavioral responses to cocaine. Biological Psychiatry 66 (8) , pp. 758-768. 10.1016/j.biopsych.2009.03.014

Full text not available from this repository.

Abstract

Background: Ras-extracellular signal-regulated kinase (Ras-ERK) signaling is central to the molecular machinery underlying cognitive functions. In the striatum, ERK1/2 kinases are co-activated by glutamate and dopamine D1/5 receptors, but the mechanisms providing such signaling integration are still unknown. The Ras-guanine nucleotide-releasing factor 1 (Ras-GRF1), a neuronal specific activator of Ras-ERK signaling, is a likely candidate for coupling these neurotransmitter signals to ERK kinases in the striatonigral medium spiny neurons (MSN) and for modulating behavioral responses to drug abuse such as cocaine. Methods: We used genetically modified mouse mutants for Ras-GRF1 as a source of primary MSN cultures and organotypic slices, to perform both immunoblot and immunofluorescence studies in response to glutamate and dopamine receptor agonists. Mice were also subjected to behavioral and immunohistochemical investigations upon treatment with cocaine. Results: Phosphorylation of ERK1/2 in response to glutamate, dopamine D1 agonist, or both stimuli simultaneously is impaired in Ras-GRF1–deficient striatal cells and organotypic slices of the striatonigral MSN compartment. Consistently, behavioral responses to cocaine are also affected in mice deficient for Ras-GRF1 or overexpressing it. Both locomotor sensitization and conditioned place preference are significantly attenuated in Ras-GRF1–deficient mice, whereas a robust facilitation is observed in overexpressing transgenic animals. Finally, we found corresponding changes in ERK1/2 activation and in accumulation of FosB/ΔFosB, a well-characterized marker for long-term responses to cocaine, in MSN from these animals. Conclusions: These results strongly implicate Ras-GRF1 in the integration of the two main neurotransmitter inputs to the striatum and in the maladaptive modulation of striatal networks in response to cocaine.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Publisher: Elsevier
ISSN: 0006-3223
Last Modified: 03 Nov 2017 01:09
URI: http://orca.cf.ac.uk/id/eprint/9122

Citation Data

Cited 67 times in Google Scholar. View in Google Scholar

Cited 72 times in Scopus. View in Scopus. Powered By Scopus® Data

Cited 52 times in Web of Science. View in Web of Science.

Actions (repository staff only)

Edit Item Edit Item