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Transcription profiling of human astrocytomas classified as low or high grade and glioma cell line controls (glioblastoma) to to identify genetic differences between the two types

ABSTRACT: Summary: Astrocytomas can be categorized as either low grade or high grade (glioblastoma). Low grade astrocytomas are not generally aggressive tumors whereas glioblastomas are and in turn have a high mortality rate. The purpose of this experiment is to identify genetic differences between the two types. Hypothesis: There will be a difference in RNA expression between high grade and low grade tumors. Specific Aim: To identify genes which make a tumor high grade or low grade Experiment Overall Design: Comparison of 8 high grade and 12 low grade tumors

ORGANISM(S): Homo sapiens

DISEASE(S): high grade glioblastoma

SUBMITTER: Eric Hoffman

PROVIDER: E-GEOD-3185 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Human Glioblastoma

Project description:Summary: Astrocytomas can be categorized as either low grade or high grade (glioblastoma). Low grade astrocytomas are not generally aggressive tumors whereas glioblastomas are and in turn have a high mortality rate. The purpose of this experiment is to identify genetic differences between the two types. Hypothesis: There will be a difference in RNA expression between high grade and low grade tumors. Specific Aim: To identify genes which make a tumor high grade or low grade Keywords: disease, cancer grade

2005-08-24 | GSE3185 | GEO

PROTEOMICS REVEALS DIFFERENTIALLY REGULATED PATHWAYS WHEN COMPARING LOW-VERSUS HIGH-GRADE ASTROCYTOMAS

Project description:Astrocytic tumors are known for their high progression capacity and for high mortality rates; in this regard, proteins correlated to prognosis can aid medical conduct. Although several genetic changes related to progression from low to high-grade astrocytoma are already known, mRNA copies do not necessarily correlate with protein abundance and, therefore could shadow further comprehension about this tumor’s biology. This motivates us to seek for complementary strategies to study tumor progression at the protein level. Here we compare the proteomic profile of biopsies from patients with low-grade (diffuse, n=6) versus high-grade astrocytoma (anaplastic and glioblastomas, n =10), using shotgun proteomics. Data analysis performed with PatternLab for proteomics identified 5,206 and 6,004 proteins in the low- and high-grade groups, respectively. Our results revealed seventy-four differentially abundant proteins (p < 0.01); we then shortlist those related to greater malignancy. We also describe molecular pathways distinctly activated in the two groups, such as differences in the organization of the extracellular matrix, decisive both in tumor invasiveness and in signaling for cell division, which, together with marked contrasts in energy metabolism, are determining factors in the speed of growth and dissemination of these neoplasms. The degradation pathways of GABA, enriched in the low-grade group, is consistent with a favorable prognosis. Other functions such as platelet degranulation, apoptosis, and activation of the MAPK pathway were correlated to high-grade tumors and, consequently, unfavorable prognoses. Our results provide an important survey of molecular pathways involved in glioma pathogenesis for these histopathological groups.

2023-08-04 | PXD033782 | Pride

Transcription profiling of human grade II astrocytic tumor (astrocytomas) vs grade IV tumors (glioblastoma)

Project description:Comparison of grade II astrocytic tumor (astrocytomas) with grade IV tumors (glioblastoma)

2007-03-01 | E-MEXP-567 | biostudies-arrayexpress

caArray_hanas-00078: Distinctive molecular profiles of high-grade and low-grade gliomas based on oligonucleotide microarray analysis

Project description:Astrocytomas are heterogeneous intracranial glial neoplasms ranging from the highly aggressive malignant glioblastoma multiforme (GBM) to the indolent, low-grade pilocytic astrocytoma. We have investigated whether DNA microarrays can identify gene expression differences between high-grade and low-grade glial tumors. We compared the transcriptional profile of 45 astrocytic tumors including 21 GBMs and 19 pilocytic astrocytomas using oligonucleotide-based microarrays. Of the approximately 6800 genes that were analyzed, a set of 360 genes provided a molecular signature that distinguished between GBMs and pilocytic astrocytomas. Many transcripts that were increased in GBM were not previously associated with gliomas and were found to encode proteins with properties that suggest their involvement in cell proliferation or cell migration. Microarray-based data for a subset of genes was validated using real-time quantitative reverse transcription-PCR. Immunohistochemical analysis also localized the protein products of specific genes of interest to the neoplastic cells of high-grade astrocytomas. Our study has identified a large number of novel genes with distinct expression patterns in high-grade and low-grade gliomas.

2015-06-25 | GSE70231 | GEO

caArray_hanas-00078: Distinctive molecular profiles of high-grade and low-grade gliomas based on oligonucleotide microarray analysis

2015-06-25 | E-GEOD-70231 | biostudies-arrayexpress

Transcription profiling of human high-grade astrocytomas reveals prognostic subgroups

Project description:Novel prognostic subclasses of high-grade astrocytoma are identified and discovered to resemble stages in neurogenesis. One tumor class displaying neuronal lineage markers shows longer survival, while two tumor classes enriched for neural stem cell markers display equally short survival. Poor prognosis subclasses exhibit either markers of proliferation or of angiogenesis and mesenchyme. Analysis of gene expression data is described in Phillips et al., Cancer Cell, 2006. Experiment Overall Design: 77 primary high-grade astrocytomas and 23 matched recurrences were profiled to identify changes in gene expression that relate to both survival and disease progression. Samples include WHO grade III and IV astrocytomas with a wide range of survival times.

2007-10-02 | E-GEOD-4271 | biostudies-arrayexpress

Gene Expression Profiling of Human Pediatric Astrocytomas

Project description:Analysis of grades II, II and iV pediatric astrocytomas. Results used to straify tumors into molecular subclasses representative of adult tumors. The mesenchymal subtype is associated with high expression of immune response-related genes. Gene expression of grade II, III and IV pediatric astrocytomas, 24 individual tumor samples were profiled

2012-08-24 | E-GEOD-38330 | biostudies-arrayexpress

Transcription profiling of human glial brain tumors

Project description:Gene expression profiling in 50 glial brain tumors and 4 normal brains using 42,000-feature cDNA microarrays (from total RNA). Tumors: 50 fresh-frozen glioma specimens subjected to standard WHO classification. Specimens included astrocytic [2 juvenile pilocytic astrocytomas, 1 low-grade astrocytic glioma, 1 anaplastic astrocytomas, 31 glioblastomas (of these 2 secondary glioblastomas and 2 gliosarcomas)], oligodendroglial [5 oligodendrogliomas, 3 anaplastic oligodendrogliomas], and 6 anaplastic oligoastrocytomas tumors. One tumor had been classified as glioneuronal neoplasm. Normal brain was purchased from Stratagene. Stratagene Universal Common Reference was used as reference RNA. The results provide insights into molecular mechanisms and pathways associated with gliomagenesis.

2005-10-06 | E-SMDB-3152 | biostudies-arrayexpress

Array-CGH in human glial brain tumors

Project description:Set of arrays organized by shared biological context, such as organism, tumors types, processes, etc. Characterization of DNA copy number changes in 54 glial brain tumors using a cDNA microarray-based comparative genomic hybridization method. Tumors: 54 fresh-frozen glioma specimens subjected to standard WHO classification. Specimens included astrocytic [3 juvenile pilocytic astrocytomas, 1 low-grade astrocytic glioma, 3 anaplastic astrocytomas, 31 glioblastomas (of these 3 secondary glioblastomas and 2 gliosarcomas)], oligodendroglial [5 oligodendrogliomas, 3 anaplastic oligodendrogliomas], and 7 anaplastic oligoastrocytomas tumors. One tumor had been classified as glioneuronal neoplasm. Human male and female genomic reference DNA was purchased from Promega (Promega, Madison, WI). The results provide insights into molecular genetic changes associated with gliomagenesis.

2010-06-10 | E-GEOD-1991 | biostudies-arrayexpress

Hierarchical synergy of Pten, p53 and Rb pathways in high-grade astrocytoma induced in adult brain

Project description:Mutations in the PTEN, TP53 and RB1 pathways are obligate events in the pathogenesis of human glioblastomas, the highest grade of astrocytoma. To investigate synergy between these tumor suppressors in mice, we induced various combinations of compound deletions conditionally in astrocytes and neural precursors in the mature brain. The resulting highly penetrant astrocytomas showed a spectrum of histopathological variation reminiscent of human tumors, and ranged from grade III to grade IV (glioblastoma). Secondary somatic mutations varied depending on the combination of initiating deletions and were relevant to human disease. Receptor tyrosine kinase amplifications were frequent in tumors initiated by combined conditional deletion of Pten and Tp53, but not when Rb, Pten and Tp53 were simultaneously deleted. Multiple mutations within PI3K and Rb pathways were acquired, however, Mapk activation was not consistently detected in astrocytomas. Gene expression profiling revealed striking similarities to previously described human astrocytoma subclasses. A subset of astrocytomas initiated outside of proliferative niches in the adult brain.

2011-03-23 | GSE22927 | GEO

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