Unknown,Transcriptomics,Genomics,Proteomics

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Transcription profiling of moderately injuried mouse spinal cord at different time points after the injury to characterize the temporal changes in gene expression that underlie the secondary injury responses.

ABSTRACT: Traumatic spinal cord injury (SCI) initiates a complex series of pathophysiological secondary responses that lead to tissue loss and functional deficits.This study represents a comprehensive database of temporal changes in gene expression that underlie the secondary injury response that occurs in a well-defined mouse model of contusion injury. Experiment Overall Design: Global changes in gene expression that contribute to secondary injury in a C57BL6 mouse model of contusion injury were evaluated using Affymetrix Mouse Genome 430 2.0 arrays.Mice were subjected to a moderate injury at the T8 spinal segment under isoflurane anesthesia.Sections of cord (0.4 cm in length) were analyzed from the site of impact and from the immediately adjacent rostral and caudal regions at 0.5, 4, 24, 72 h and 7 and 28 days after injury (n=3/per group), sham-injury (n=2 per group), or from naive mice (n=2). Four mice were pooled for each individual n, for a total of 12 mice for each injury time point.

ORGANISM(S): Mus musculus

SUBMITTER: Eric Hoffman

PROVIDER: E-GEOD-5296 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:The spinal cord after injury shows altered transcription in numerous genes. We tested in a pilot study whether the nucleus raphé magnus, a descending serotonergic brainstem region whose stimulation improves recovery after incomplete spinal cord injury, can influence these transcriptional changes. Rats received 2 hours of low-frequency electrical stimulation in the raphé magnus three days after an impact contusion at segment T8. Comparison groups lacked injuries or activated stimulators or both. Immediately following stimulation, spinal cords were extracted, their RNA transcriptome sequenced, and differential gene expression quantified. Confirming many previous studies, injury primarily increased inflammatory and immune transcripts and decreased those related to lipid and cholesterol synthesis and neuronal signaling. Stimulation plus injury, contrasted with injury alone, caused significant changes in 43 transcripts (39 increases, 4 decreases), all protein-coding. Injury itself decreased only four of these 43 transcripts, all reversed by stimulation, and increased none of them. The non-specific 5-HT7 receptor antagonist pimozide reversed 25 of the 43 changes. Stimulation in intact rats principally caused decreases in transcripts related to oxidative phosphorylation, none of which were altered by stimulation in injury. Gene ontology (biological process) annotations comparing stimulation with either no stimulation or pimozide treatment in injured rats highlighted defense responses to lipopolysaccharides and microorganisms, and also erythrocyte development and oxygen transport (possibly yielding cellular oxidant detoxification). Connectivity maps of human orthologous genes generated in the CLUE database of perturbagen-response transcriptional signatures showed that drug classes whose effects in injured rats most closely resembled stimulation without pimozide include peroxisome proliferator-activated receptor agonists and angiotensin receptor blockers, which are reportedly beneficial in spinal cord injury. Thus, the initial transcriptional response of injured spinal cord to raphé magnus stimulation is upregulation of genes that in various ways are mostly protective, some probably located in recently arrived myeloid cells.

Dataset Information

Transcription profiling of moderately injuried mouse spinal cord at different time points after the injury to characterize the temporal changes in gene expression that underlie the secondary injury responses.

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