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Gene expressing profiling of PC12 cells expressing the FGFR3 mutation responsible for thanatophoric dysplasia type II

ABSTRACT: To investigate signaling pathways activated by FGFR3 mutations through an analysis of altered expression of downstream transcriptional targets, we performed gene expression profiling of stably transfected inducible PC12 cells expressing a chimeric receptor (PFR3) consisting of the extracellular domain of human platelet derived growth factor receptor (PDGFR) and the transmembrane and intracellular domains of human FGFR3 under the control of the zinc inducible metalliothionein promoter. Cells expressing the wildtype receptor (i.e. zinc induced) were compared to cells expressing the mutant receptor PFR3K650E, which contains the thanatophoric dysplasia type II mutation, K650E. See PubMed ID for further description of samples. Keywords = thanatophoric dysplasia Keywords = FGFR3 Keywords = PC12 Keywords = ERK1/2 Keywords: repeat sample

ORGANISM(S): Rattus norvegicus

PROVIDER: GSE2606 | GEO | 2005/05/06

SECONDARY ACCESSION(S): PRJNA92147

REPOSITORIES: GEO

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Project description:Huntingtonâs disease (HD) is a devastating disease for which currently no therapy is available. It is a progressive autosomal dominant neurodegenerative disorder that is caused by a CAG repeat expansion in the HD gene, resulting in an expansion of polyglutamines at the N-terminal end of the encoded protein, designated huntingtin, and the accumulation of cytoplasmic and nuclear aggregates. Not only is there a loss of normal huntingtin function, upon expansion of the CAG repeat there is also a gain of toxic function of the huntingtin protein and this affects a wide range of cellular processes. To identify groups of genes that could play a role in the pathology of Huntingtonâs disease, we studied mRNA changes in an inducible PC12 model of Huntingtonâs disease before and after aggregates became visible. This is the first study to show the involvement Nrf2-responsive genes in the oxidative stress response in HD. Oxidative stress related transcripts were altered in expression suggesting a protective response in cells expressing mutant huntingtin at an early stage of cellular pathology. Furthermore, there was a down-regulation of catecholamine biosynthesis resulting in lower dopamine levels in culture. Our results further demonstrate an early impairment of transcription, the cytoskeleton, ion channels and receptors. Given the pathogenic impact of oxidative stress and neuroinflammation, the Nrf2-ARE signaling pathway is an attractive therapeutic target for neurodegenerative diseases. Keywords: Gene expression analysis, Huntington's disease, oxidative stress, PC12 cell model For each construct, we performed duplicate experiments with 2 independent cell lines for each construct yielding 2 biological replicates. Furthermore, from each cell line, two separate RNA isolations were performed serving as technical replicates. For PC12 cells with no construct, only a technical replicate was used. RNA was harvested prior to induction (day 0), after 24 hours of induction (day 1) and after 5 days of induction of exon 1 huntingtin fragments with normal (Q23) and extended (Q74) glutamine repeat length.

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Gene expressing profiling of PC12 cells expressing the FGFR3 mutation responsible for thanatophoric dysplasia type II

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