Unknown,Transcriptomics,Genomics,Proteomics

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Gene expression profiling in neuroblastoma cells upon CHAF1A silencing

ABSTRACT: We used an inducible ShRNA system and microarrays to detail the global programme of gene expression underlying neuroblastoma differentiation upon CHAF1A silencing . CHAF1A is a subunit of the Chromatin Assembly Factor-1 (CAF1) and regulates H3K9-trimethylation. High expression of CHAF1A strongly correlates with neuroblastoma poor prognosis and loss-of-function drives neuronal differentiation in vitro and in vivo. Total RNA was isolated using RNAeasy kit from IMR32 cells transduced with inducible CHAF1A ShRNA. Gene expression profiling was performed in neuroblastoma cells upon CHAF1A silencing over time course (0, 5, and 10 days) in triplicate.

ORGANISM(S): Homo sapiens

SUBMITTER: Eveline Barbieri

PROVIDER: E-GEOD-51978 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:Neuroblastoma is an embryonal tumor which originates from neural crest progenitor cells that fail to differentiate along their predefined route to sympathetic neurons or sympatho-adrenergic adrenal cells. It is the most common extracranial tumor of childhood and accounts for 15% of all childhood cancer deaths. Especially patients suffering from high grade or relapsed neuroblastoma have poor outcome in spite of aggressive treatment regimens including autologous stem cell transplantation. Those patients are in urgent need of additional effective therapies which demands the development of targeted approaches. Dihydroorotatedehydrogenase (DHODH) is the fourth enzyme of the pyrimidine synthesis pathway which oxidizes dihydroorotate to orotate. In recent past it became a potential drug target for cancer treatment because of its keyrole in processing essential pyrimidine nucleotides. On the basis of the existing data, functional inhibition of DHODH is considered to be promising therapeutic option for several tumor entities like advanced colorectal, breast or lung-cancers. Leflunomide is an established drug in treatment of the autoimmune diseases rheumatoid arthritis and multiple sclerosis. In the liver Leflunomide becomes converted to its active metabolite called Teriflunomide, which inhibits the activity of DHODH directly. In recent times Leflunomide is also used for therapy against the Cytomegalovirus and the BK virus. Also for Melanoma was shown recently a decreased growth rate due to Leflunomide treatment in a zebrafish and a mouse model. As Melanoma is a malignant tumor of the skin, which derives also from neural crest progenitor cells, a coherent investigation of effictivity of Leflunomide in neuroblastoma celllines showed first promising results. The aim of our study was to reanalyse the effectivity of Leflunomide in Neuroblastoma and to shed further light in its biological mode of action. Three+B52 biological samples of the human neuroblastoma cell line IMR32 were treated with DMSO or Teriflunomide [118 ￂﾵM]

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Gene expression profiling in neuroblastoma cells upon CHAF1A silencing

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