Tissue glycomics distinguish tumour sites in women with advanced serous adenocarcinoma. Issue 11 (29th September 2017)

• Record Type: Journal Article
• Authors: Anugraham, Merrina; Jacob, Francis; Everest‐Dass, Arun V.; Schoetzau, Andreas; Nixdorf, Sheri; Hacker, Neville F.; Fink, Daniel; Heinzelmann‐Schwarz, Viola; Packer, Nicolle H.
• Is Part Of: Molecular oncology. Volume 11:Issue 11(2017)
• Page Start: 1595
• Page End: 1615
• Publication Date: 2017-09-29
• Subjects: gene expression -- glycans -- mass spectrometry -- ovarian cancer -- peritoneal cancer -- porous graphitized carbon; Cancer -- Molecular aspects -- Periodicals; 616.994005
• DOI: 10.1002/1878-0261.12134
• Languages: English
• ISSNs: 1574-7891

Abstract

Abstract : In the era of precision medicine, the tailoring of cancer treatment is increasingly important as we transition from organ‐based diagnosis towards a more comprehensive and patient‐centric molecular diagnosis. This is particularly the case for high‐grade serous adenocarcinomas of the ovary and peritoneum, which are commonly diagnosed at an advanced stage, and collectively treated and managed similarly. We characterized the N ‐ and O ‐glycome of serous ovarian (OC) and peritoneal cancer (PC) tissues using PGC‐LC‐ESI‐IT‐MS/MS profiling and validated the discriminatory glycans and their corresponding glyco‐gene expression levels using cell lines and transcriptomic data from 232 patients. Overall, the N ‐ and O ‐glycan repertoires of both cancer types were found to comprise mostly of α2, 6‐sialylated glycan structures, with the majority of N ‐glycans displaying the biantennary mono‐ and disialylation as well as bisecting‐type biantennary glycans. The MS profiling by PGC‐LC also revealed several glycan structural isomers that corresponded to LacdiNAc‐type (GalNAcβ1‐4GlcNAc) motifs that were unique to the serous ovarian cancers and that correlated with elevated gene expression of B4GALNT3 and B4GALNT4 in patients with serous cancer. Statistical evaluation of the discriminatory glycans also revealed 13 N ‐ and 3 O ‐glycans ( P < 0.05) that significantly discriminated tumour‐sampling sites, with LacdiNAc‐type N ‐glycans ( m / z 1205.0 2− and m / z 1059.4 2− ) being associated with ovarian‐derived cancer tissue and bisecting GlcNAc‐type ( m / z 994.9 2− ) and branched N ‐glycans ( m / z 1294.0 2− and m / z 1148.4 2− ) upregulated at the metastatic sites. Hence, we demonstrate for the first time that OC and PC display distinct molecular signatures at both their glycomic and transcriptomic levels. These signatures may have potential utility for the development of accurate diagnosis and personalized treatments. Abstract : We characterized the glycomic profiles of serous ovarian and peritoneal cancer cells and tissues and their corresponding glyco‐gene expression levels. The profiling revealed sugar motifs that were unique to serous ovarian cancers and correlated with elevated gene expression of the synthetic enzymes. We demonstrate for the first time that ovarian and peritoneal cancers display distinct molecular signatures with potential utility for the development of accurate diagnosis and personalized treatments.