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Gene expression profiling and pathway analyses reveal molecular signatures and relationships underlying enhanced methamphetamine neurotoxicity caused by protracted corticosterone exposure.

Kelly-KA; Miller-DB; O'Callaghan-JP
Neuroscience 2012: 42nd Annual Meeting of the Society for Neuroscience, October 13-17, 2012, New Orleans, Louisiana. Washington, DC: Society for Neuroscience, 2012 Oct; :63.16/Q10
Damage to the CNS results in complex changes in molecular and cellular pathways associated with neuronal and glial responses at the sites of injury. Enhanced expression of proinflammatory cytokines and chemokines often accompanies injury-induced glial activation, including glial responses to neurotoxic insults. Previously, we documented a striatal neuroinflammatory response following nerve terminal damage due to acute exposure of mice to the dopaminergic neurotoxicant methamphetamine (METH), one that was markedly exacerbated by pretreatment with the stress hormone corticosterone (CORT). When mice were pretreated with chronic CORT, an exaggerated neuroinflammatory response (TNF-alpha, IL6, chemokine (C-C motif) ligand 2 (CCL2), IL1-beta, leukemia inhibitory factor (LIF) and oncostatin M (OSM)) to METH was observed, an effect that was accompanied by exacerbated METH-induced astrogliosis (glial fibrillary acidic protein (GFAP)), microglial activation (Isolectin B) and dopaminergic neurotoxicity (Tyrosine Hydroxylase (TH)). To elucidate further changes associated with chronic CORT (1 week in drinking water) pretreatment, we examined gene expression profiles in the striatum at 12 and 24 hours after METH exposure of C57Bl6/J male mice (20 mg/kg, s.c.) to chronic CORT (400 mg/L) or vehicle treated mice. Using an Illumina MouseRef-8 BeadChip by Expression Analysis to assess gene expression after CORT and METH treatment followed by Ingenuity Pathway Analysis, we observed changes consistent with our previous findings. The top networks for chronic CORT and METH treated mice were inflammatory response, cell death, endocrine system development and function (with a score of 54) at 12h and inflammatory response, cell-to-cell signaling and interaction, cell death (with a score of 53) at 24h including focus molecules GFAP, LIF, suppressor of cytokine signaling 3 (SOCS3), S100 calcium binding protein B (S100B), signal transducer and activator of transcription 3 (STAT3) and TH. The top networks for METH treatment alone were cell death, nervous system development and function, cellular movement (with a score of 19) at 12h and behavior, cell signaling, molecular transport (with a score of 19) at 24h including focus molecules chemokine (C-X-C motif) ligand 2 (CXCL2), GFAP, S100B and serine proteinase inhibitor, clade A, member 3 (SERPINA3). Many of the focus molecules up- and down-regulated in this data set are related to astrogliosis and neuroinflammation. These data will inform further investigation of the mechanisms of METH-induced dopaminergic neurotoxicity and provide the earliest biomarkers of neuroinflammation and glial activation responses.
Laboratory-animals; Animal-studies; Animals; Central-nervous-system; Neurological-reactions; Author Keywords: Corticosterone; Kainic Acid; Gene Expression
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Neuroscience 2012: 42nd Annual Meeting of the Society for Neuroscience, October 13-17, 2012, New Orleans, Louisiana