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NGF-induced gene expression in silent nociceptors

ABSTRACT: NGF-induced gene expression in silent nociceptors

PROVIDER: PRJNA820757 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR18505445_1.fastq.gz	Fastqsanger.gz
	SRR18505445_2.fastq.gz	Fastqsanger.gz
	SRR18505446_1.fastq.gz	Fastqsanger.gz
	SRR18505446_2.fastq.gz	Fastqsanger.gz
	SRR18505447_1.fastq.gz	Fastqsanger.gz

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NGF-induced gene expression in silent nociceptors

Project description:Silent nociceptors are sensory afferents that are insensitive to noxious mechanical stimuli under normal conditions but become sensitized to such stimuli during inflammation. We had previously shown that mouse silent nociceptors express the nicotinic acetylcholine receptor alpha-3 subunit (CHRNA3) and can thus readily be identified in Tg(Chrna3-EGFP)BZ135Gsat reporter mice (Prato et al. Cell Reports 2017). Most importantly, we had shown that CHRNA3+ slient nociceptors acquire mechanosensitivity upon treatment with the inflammatory mediator nerve growth factor and demonstrated that this process requires de-novo gene transcription. Here, we performed paired-end RNA-sequencing to identify transcripts that might be involved in the acquisition of mechanosenstivity in mouse silent nociceptors.

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Transcriptional programs controlled by NGF signaling in developing mouse dorsal root ganglia neurons

Project description:During embryogenesis, nociceptive sensory neurons of the dorsal root ganglia depend intimately on Nerve Growth Factor (NGF) for neuronal survival, maturation and target innervation. NGF is a secreted molecular signal synthesized by neuronal target tissues. In developing nociceptors, NGF engages the receptor tyrosine kinase TrkA to activate a gene transcriptional program involving the regulation of hundreds of transcripts. To identify NGF-dependent genes in developing mouse nociceptors, we have designed and performed two separate microarray screens to compare gene expression profiles of DRG neurons either with or lacking NGF signaling. For the first screen comparing DRGs of BaxM-bM-^HM-^R/M-bM-^HM-^R and NgfM-bM-^HM-^R/M-bM-^HM-^R; BaxM-bM-^HM-^R/M-bM-^HM-^R mice, DRGs were dissected and pooled from E14.5 NgfM-bM-^HM-^R/M-bM-^HM-^R; BaxM-bM-^HM-^R/M-bM-^HM-^R and BaxM-bM-^HM-^R/M-bM-^HM-^R embryos. Total RNA was extracted and directly subjected to microarray analysis. For the second screen comparing mouse DRG explants grown in the presence or absence of NGF, E13.5 mouse DRG explants were cultured for two days with 50 ng/ml of either NGF or NT3. Total RNA was extracted and then subjected to microarray analysis.

2013-11-01 | E-GEOD-25611 | biostudies-arrayexpress

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Project description:We explored the effects of nociceptors on DC under various conditions by means of in vitro coculture of Flt3L-induced bone marrow-derived DCs and primary mouse nociceptors.

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Global expression analysis identified a preferentially NGF-induced transcriptional program regulated by sustained MEK/ERK and AP-1 activation during PC12 differentiation.

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Global expression analysis identified a preferentially NGF-induced transcriptional program regulated by sustained MEK/ERK and AP-1 activation during PC12 differentiation.

Project description:Neuronal differentiation of PC12 cells in response to NGF is a prototypical model in which signal duration determines a biological response. Sustained ERK activity induced by NGF, as compared to transient activity induced by EGF, is critical to the differentiation of these cells. To characterize the transcriptional program activated preferentially by NGF, we compared global gene expression profiles between cells treated with NGF and EGF for 2-4 hrs, when sustained ERK signaling in response to NGF is most distinct from the transient signal elicited by EGF. This analysis identified 69 genes that were preferentially upregulated in response to NGF. PC12 cells that were starved in low serum media for 24 hrs were treated with NGF (50ng/mL) or EGF (25ng/mL) for 2 or 4 hrs, or left untreated. Total RNA for 3 independent biological replicates was extracted and subjected to Affymetrix Rat Gene 1.0ST Arrays. The 69 genes that were preferentially upregulated by NGF compared to EGF met the following criteria: NGF/No treatment log2> 1, FDR p value< 0.01 and NGF/EGF log2> 0.75, FDR p value< 0.01.

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Global analysis of gene expression in NGF-deprived sympathetic neurons identifies molecular pathways associated with cell death

Project description:Developing sympathetic neurons depend on nerve growth factor (NGF) for survival and die by apoptosis after NGF withdrawal. This process requires de novo gene expression but only a small number of genes induced by NGF deprivation have been identified so far. We have used Affymetrix Exon arrays to study the pattern of expression of all known genes in sympathetic neurons deprived of NGF. We identified 415 up- and 813 down-regulated genes, including most of the genes previously known to be regulated in this system. By including a mixed lineage kinase (MLK) inhibitor, CEP-11004, in our experimental design we identified which of the genes induced after NGF withdrawal are potential targets of the MLK-JNK-c-Jun pathway. A detailed Gene Ontology and functional enrichment analysis also identified genetic pathways, such as the ER unfolded protein response, that are highly enriched and overrepresented amongst the genes expressed after NGF withdrawal whilst hierarchical cluster analysis revealed four major patterns of gene expression. Five genes not previously studied in sympathetic neurons - trb3, ddit3, txnip, ndrg1 and mxi1 - were validated by real time-PCR. The proteins encoded by these genes also increased in level after NGF withdrawal and this increase was prevented by CEP-11004, suggesting that these genes are potential targets of the MLK-JNK-c-Jun pathway. Overall, our microarray data gives a comprehensive overview of, and provides new information about, signalling pathways and transcription factors that are regulated by NGF withdrawal and identifies potential targets of the MLK-JNK-c-Jun pathway in sympathetic neurons

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