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2016 ; 15
(9
): 3058-70
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Human Leukocyte Antigen (HLA) Peptides Derived from Tumor Antigens Induced by
Inhibition of DNA Methylation for Development of Drug-facilitated Immunotherapy
#MMPMID27412690
Shraibman B
; Kadosh DM
; Barnea E
; Admon A
Mol Cell Proteomics
2016[Sep]; 15
(9
): 3058-70
PMID27412690
show ga
Treatment of cancer cells with anticancer drugs often fails to achieve complete
remission. Yet, such drug treatments may induce alteration in the tumor's 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 anticancer immunotherapeutics.
For example, the DNA methyl transferase inhibitor, 5-aza-2'-deoxycytidine
(Decitabine) has limited antitumor 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 proteomics and HLA peptidomics data are available
via ProteomeXchange with identifier PXD003790 and the transcriptomics data are
available via GEO with identifier GSE80137.