Transcriptomic and Proteomic Analyses of Mouse Cerebellum Reveals Alterations in RasGRF1 Expression Following in Vivo Chronic Treatment with Delta 9-tetrahydrocannabinol

Overview

Journal J Mol Neurosci

Specialties Molecular Biology
Neurology

Date 2008 Jun 28

PMID 18584336

Citations 20

Authors

Graziano Colombo

Francesco Rusconi

Tiziana Rubino

Angela Cattaneo

Enzo Martegani

Daniela Parolaro

Angela Bachi

Renata Zippel

Affiliations

Soon will be listed here.

Abstract

We have applied transcriptomic and proteomic techniques to identify changes in the RNA and the protein levels in the mouse cerebellum after chronic treatment with Delta(9)-tetrahydrocannabinol (THC). Among approximately 14,000 transcripts in a mouse cDNA microarray library, we found 11 genes with altered expression. RasGRF1, a neuron-specific Ras guanine nucleotide exchange factor, showed a reduction both at the RNA and protein levels with a specific decrease of the protein pool associated to cell membranes. In addition, proteomic analysis on cerebellum obtained from chronically THC-treated mice detected quantitative changes of additional 27 spots, mostly in the membranous fraction. We found enrichment of alpha (Galphao, Galphaq) and beta subunits (beta4/beta2 and beta5) of guanine nucleotide-binding proteins and of two calcium-binding proteins, calretinin and hippocalcin-like protein-1. In addition, we also detected a significant increase in the membrane fraction of proteins involved in exo-endocytosis such as septins, dynamin-1, and vesicle protein sorting 29. By western blotting, we confirmed increased membrane localization of calretinin and of dynamin-1 isoforms with higher isoelectric point, indicative for an underphosphorylated state of the molecule. In conclusion, our results indicate that chronic THC modulates the expression and subcellular localization of proteins implicated in Ras signaling, calcium-buffering potential, and trafficking.

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