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Transcription profiling by array of human glioblastoma mulitforme tumors after dendritic cell vaccination

ABSTRACT: Human Glioblastoma Multiforme tumors taken before dendritic cell vaccination, the recurrent tumors taken after vaccination and control GBM tumors from non vaccinated patients. Experiment Overall Design: Six Glioblastoma Multiforme patients underwent surgery. Their brain tumors were removed and analyzed via microarray. The lysate from the tumors were cultured with the patients' dendritic cells and the DCs were injected back into the patients. The patients GBMs returned and they underwent surgery a second time and those tumors were also analyzed via microarray. Tumors from the first and second GBM surgeries of 5 patients who did not receive DC vaccines are included as controls.

ORGANISM(S): Homo sapiens

SUBMITTER: Irvin DK

PROVIDER: S-ECPF-GEOD-11100 | biostudies-other | 2010

REPOSITORIES: biostudies-other

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Project description:Gonadotrope or null cell pituitary tumors present clinically with signs of hypogonadism and hypopituitarism, together with visual disturbances due to mass effects. Since there are no medical therapies, surgery and/or radiation are the only therapeutic options. To identify dysregulated genes and/or pathways that may play a role in tumorigenesis and/ or progression, molecular profiling was performed on 14 gonadotrope tumors and 9 normal human pituitaries from autopsy samples. Principle component analysis (PCA) revealed clear discrimination between tumor and normal pituitary gene expression profiles. Bioinformatic analysis identified specific genes and pathways that were highly differentially regulated, including a cohort of putative downstream effectors of p53 were repressed in gonadotrope pituitary tumors, including GADD45β, GADD45γ and Reprimo with concomitant downregulation of the upstream regulator, PLAGL1. PLAGL1 reexpression in gonadotrope cells did not directly modulate the downstream targets. Further functional analysis of GADD45β was performed. Overexpression of GADD45β in mouse gonadotrope cells blocked proliferation, increased rates of apoptosis in response to growth factor withdrawal and increased colony formation in soft agar. In contrast to prior studies with GADD45γ, methylation interference assays showed no evidence of epigenetic modification of the GADD45β promoter in pituitary tumors. Thus, our data suggest that many components downstream of p53 are suppressed in gonadotrope pituitary tumors. A novel candidate, GADD45β is low in tumors and reexpression blocks proliferation, survival and tumorigenesis in gonadotrope cells. Unlike GADD45γ, GADD45β is not methylated to block its expression. Together these studies identify new targets and mechanisms to explore concerning pituitary tumor initiation and progression. To elucidate mechanisms involved in pituitary tumorigenesis and progression, we performed individual gene expression microarray analysis using Affy U133 Plus 2.0 GeneChips comparing 14 gonadotrope tumors with 9 normal pituitary samples obtained at autopsy.

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Transcription profiling by array of human glioblastoma mulitforme tumors after dendritic cell vaccination

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