Unknown,Transcriptomics,Genomics,Proteomics

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Epigenetic regulation of miRNA in CLL [ChIP_hsa_miRNA_v3b]

ABSTRACT: Genome-wide profiling of histone 3 lysine 4 trimethylation is used for identification of microRNA transcriptional start sites. Various cell types allow a broad range detection of putative promoters rather independent of tissue specific expression patterns. These data are used for identification of aberrant epigenetic regulation at the respective regions. 11 samples total: 3 primary B-cell samples (1 chronic lymphocytic leukemia [CLL] and 2 healthy controls), 2 CLL related cell lines -/+ 5-aza-2M-bM-^@M-^Y-deoxycytidine (DAC) treatment (Mec-1, EHEB), T-lymphoid cell line JURKAT, myeloid cell line HL-60, colon cancer cell line HCT-116 wild type and double knock out; H3K4me3 enriched vs. input

ORGANISM(S): Homo sapiens

SUBMITTER: Constance Baer

PROVIDER: E-GEOD-33305 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:All nucleated mammalian cells express major histocompatibility complex (MHC) proteins that present peptides on cell surfaces for immune surveillance. These MHC-presented peptides (pMHC) can convey non-self antigens derived from pathogens or mutations to amount T-cell responses. Alterations in tumor-specific antigens – particularly mutation-bearing peptides (neoantigens) presented by MHC — can serve as potent substrates for anti-tumor immune responses. Here we employed an integrated genomic and proteomic antigen discovery strategy aimed at measuring interferon gamma (IFN-γ) induced alterations to antigen presentation, using a lymphoma cell line. IFN-γ treatment resulted in a set of differentially expressed proteins (2 % of all quantified proteins) including components of antigen presentation machinery or interferon signaling pathways. In addition, several proteasome subunits were found to be modulated, consistent with previous reports of immunoproteasome induction by IFN-γ exposure. This finding suggests that a modest proteomic response to IFN-γ could create larger alteration to cells antigen repertoires. Accordingly, by surveying immunopeptides, distinct peptide repertoires were exclusively observed in the IFN-γ induced samples. Furthermore, an additional set of presented peptides distinguished control and the IFN-γ samples by their altered relative abundances including neoantigens. Accordingly, we developed a classification system to distinguish peptides which are differentially presented due to altered expression from novel peptides resulting from changes in antigen processing. Taken together, these data demonstrate that IFN-γ can re-shape antigen repertoires by identity and by abundance. Extending this approach to models with greater clinical relevance should help develop strategies by which immunopeptide repertoires are intentionally reshaped to improve endogenous or vaccine-induced anti-tumor immune responses and potentially anti-viral immune responses.

Dataset Information

Epigenetic regulation of miRNA in CLL [ChIP_hsa_miRNA_v3b]

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