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Series GSE6675 Query DataSets for GSE6675
Status Public on Jan 09, 2007
Title Astroglial gene expression program elicited by fibroblast growth factor-2 mande-affy-mouse-307080
Organism Mus musculus
Experiment type Expression profiling by array
Summary Astroglia, the star-shaped cells found throughout the central nervous system are the most numerous cell type in the brain. The astroglial response to injury, generically termed reactive astrogliosis, is classically defined by cellular hypertrophy and process extension, increased glial filament production, and some degree of proliferation. Astrogliosis and its functional outcomes, glial scar formation and neuroinflammation, are often viewed as detrimental to recovery. However, increasing evidence points to neuroprotective roles of reactive astroglia in the setting of brain injury. Therapeutic modulation of this double-edged sword will require detailed knowledge of mechanisms by which specific signals induce detrimental and beneficial phenotypes.
This proposal is is a logical extension of a published, peer reviewed study (Heffron DS and Mandell JW, Opposing roles of ERK and p38 MAP kinases in FGF2-induced astroglial process extension. Mol Cell Neurosci 2005, 28:779-90). The downstream gene expression changes underlying these pathway-specific responses are largely unknown. The data generated from the proposed project will delineate pathway-specific gene expression responses of astroglia to fibroblast growth factors. This information will allow a rational approach to pharmacological approaches to modulate reactive astrogliosis in brain and spinal cord injury.
Determine the astroglial gene expression program elicited by fibroblast growth factor-2, and dissect specific contributions of the ERK and p38 MAP kinase pathways using highly specific pharmacological inhibitors.
FGF2, acting via two distinct intracellular signaling pathways, ERK- and p38 MAPK, leads to pathway-specific gene expression changes in astrocytes which promote the morphological plasticity (ERK-dependent) and pro-inflammatory properties (p38-dependent) of reactive astroglia.
Cell culture
Neonatal primary astrocyte cultures are prepared exactly as previously described (Heffron and Mandell, 2005), using slight modifications of established protocols (McCarthy and de Vellis, 1980).
Astrocytes prepared with these methods comprised greater than 95% of cell cultures as determined by GFAP staining. Microglia are present as a contaminating cell type at a percentage of 3.6 ± 0.9% as determined by CD11B staining.
For process induction experiments, cells are trypsinized and replated in DMEM with 1% fetal bovine serum. This low serum concentration is necessary for good adhesion of the cells. Pharmacological inhibitors are dissolved in DMSO and added 2 h later. P38 MAP kinase inhibitors SB202190 (Calbiochem) and the MEK inhibitor U0126 (Promega) are used at 20 µM. We previously determined that the inactive analog of SB 202190, SB202474 (Calbiochem) had no effects on pathway activation or astrocyte morphology. Therefore, the inactive drug analog will not be used in the array experiments.
Final DMSO concentration in the drug treatments and vehicle controls is 0.2%. Human recombinant FGF2 (obtained from the National Cancer Institute Preclinical Repository) is used at 25 ng/ml, based on extensive dose/response analyses in our published work.
Keywords: fibroblast growth factor-2 treatment
 
 
Contributor(s) Mandell JW
Citation missing Has this study been published? Please login to update or notify GEO.
Submission date Jan 08, 2007
Last update date Feb 11, 2019
Contact name Winnie Liang
E-mail(s) wliang@tgen.org
Organization name Translational Genomics
Street address 445 N. Fifth Street
City Phoenix
State/province AZ
ZIP/Postal code 85012
Country USA
 
Platforms (1)
GPL1261 [Mouse430_2] Affymetrix Mouse Genome 430 2.0 Array
Samples (8)
GSM154320 brain, cerebral cortex: Extract 1_le1
GSM154321 brain, cerebral cortex: Extract 2_le1
GSM154322 brain, cerebral cortex: Extract 3_le1
Relations
BioProject PRJNA98615

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Supplementary file Size Download File type/resource
GSE6675_RAW.tar 27.6 Mb (http)(custom) TAR (of CEL)
Raw data provided as supplementary file

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