Dataset Information

Identification of tumor antigens among the HLA peptidomes of Glioblastoma tumors and plasma

ABSTRACT: Glioblastoma multiforme (GBM) is the most aggressive brain tumor with poor prognosis to most patients. Immunotherapy of GBM is a potentially beneficial treatment option, whose optimal implementation may depend on familiarity with tumor specific antigens, presented as HLA peptides by the GBM cells. Furthermore, early detection of GBM, such as by a routine blood test, may improve survival, even with the current treatment modalities. This study includes large-scale analyses of the HLA peptidome (immunopeptidome) of the plasma-soluble HLA molecules (sHLA) of 142 plasma samples and the membranal HLA of GBM tumors of 10 tumor samples of the same patients. Tumor samples were fresh-frozen immediately after surgery and plasma samples were collected before, and at multiple visits after surgery. In total, this HLA peptidome analysis involved 52 different HLA allotypes and resulted in the identification of more than 35,000 different HLA peptides. Strong correlations were observed in the signal intensities and in the repertoires of identified peptides between the tumors and plasma-soluble HLA peptidomes of the same patients; yet, low correlations were observed between these HLA peptidomes and the tumors’ proteomes. HLA peptides derived from Cancer/Testis Antigens (CTAs) were selected based on their presence among the HLA peptidomes of the patients and absence of expression of their source genes from any healthy and essential human tissues, except from immune-privileged sites. Additionally, peptides were selected as potential biomarkers if their levels in the plasma-sHLA peptidome were significantly reduced after the removal of tumor mass. The CTAs identified among the analyzed HLA peptidomes provide new opportunities for personalized immunotherapy and for early diagnosis of GBM.

INSTRUMENT(S): Q Exactive

ORGANISM(S): Homo Sapiens (ncbitaxon:9606)

SUBMITTER: Arie Admon

PROVIDER: MSV000084343 | MassIVE |

SECONDARY ACCESSION(S): PXD008127

REPOSITORIES: MassIVE

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Identification of Tumor Antigens Among the HLA Peptidomes of Glioblastoma Tumors and Plasma.

Shraibman Bracha B Barnea Eilon E Kadosh Dganit Melamed DM Haimovich Yael Y Slobodin Gleb G Rosner Itzhak I López-Larrea Carlos C Hilf Norbert N Kuttruff Sabrina S Song Colette C Britten Cedrik C Castle John J Kreiter Sebastian S Frenzel Katrin K Tatagiba Marcos M Tabatabai Ghazaleh G Dietrich Pierre-Yves PY Dutoit Valérie V Wick Wolfgang W Platten Michael M Winkler Frank F von Deimling Andreas A Kroep Judith J Sahuquillo Juan J Martinez-Ricarte Francisco F Rodon Jordi J Lassen Ulrik U Ottensmeier Christian C van der Burg Sjoerd H SH Thor Straten Per P Poulsen Hans Skovgaard HS Ponsati Berta B Okada Hideho H Rammensee Hans-Georg HG Sahin Ugur U Singh Harpreet H Admon Arie A

Molecular & cellular proteomics : MCP 20180802 11

Glioblastoma multiforme (GBM) is the most aggressive brain tumor with poor prognosis to most patients. Immunotherapy of GBM is a potentially beneficial treatment option, whose optimal implementation may depend on familiarity with tumor specific antigens, presented as HLA peptides by the GBM cells. Furthermore, early detection of GBM, such as by a routine blood test, may improve survival, even with the current treatment modalities. This study includes large-scale analyses of the HLA peptidome (im ...[more]

PMID: 30072578

Publication: 1/2

Similar Datasets

Project description:Treatment of cancer cells with anti-cancer drugs often fails to achieve complete remission. Yet, such drug treatments may induce alteration in the tumorâs gene expression patterns, including those of Cancer/Testis Antigens (CTA). The degradation products of such antigens can be presented as HLA peptides on the surface of the tumor cells and be developed into anti-cancer immunotherapeutics. For example, the DNA methyl transferase inhibitor, 5-aza-2'-deoxycytidine (Decitabine) has limited anti-tumor efficacy, yet it induces the expression of many genes, including CTAs that are normally silenced in the healthy adult tissues. In this study, the presentation of many new HLA peptides derived from CTAs and induced by Decitabine was demonstrated in three human Glioblastoma cell lines. Such presentation of CTA-derived HLA peptides can be exploited for development of new treatment modalities, combining drug treatment with anti-CTA targeted immunotherapy. The Decitabine-induced HLA peptidomes include many CTAs that are not normally detected in healthy tissues or in cancer cells, unless treated with the drug. In addition, the study included large-scale analyses of the simultaneous effects of Decitabine on the transcriptomes, proteomes and HLA peptidomes of the human Glioblastoma cells. It demonstrates the poor correlations between these three levels of gene expression, both in their total levels and in their response to the drug. The transcriptomes, proteomes and HLA peptidomes of the U-87, T98G and LNT-229 GBM human cell lines were analyzed before and after treatment with Decitabine. Overall, the RNA-Seq transcriptome analyses resulted in the identification of above 26000 transcripts, the proteome analyses identified about 7500 proteins and the HLA class I peptidome analyses resulted in above 25000 identified HLA peptides. Two biological repetitions of the transcriptome, three of the proteome and three of the HLA peptidome were performed with each of the cell lines and treatment, resulting in highly reproducible datasets.