O-glycans truncation modulates gastric cancer cell signaling and transcription leading to a more aggressive phenotype.

Abstract:

BACKGROUND:Changes in glycosylation are known to play critical roles during gastric carcinogenesis. Expression of truncated O-glycans, such as the Sialyl-Tn (STn) antigen, is a common feature shared by many cancers and is associated with cancer aggressiveness and poor-prognosis. METHODS:Glycoengineered cell lines were used to evaluate the impact of truncated O-glycans in cancer cell biology using in vitro functional assays, transcriptomic analysis and in vivo models. Tumor patients 'samples and datasets were used for clinical translational significance evaluation. FINDINGS:In the present study, we demonstrated that gastric cancer cells expressing truncated O-glycans display major phenotypic alterations associated with higher cell motility and cell invasion. Noteworthy, the glycoengineered cancer cells overexpressing STn resulted in tumor xenografts with less cohesive features which had a critical impact on mice survival. Furthermore, truncation of O-glycans induced activation of EGFR and ErbB2 receptors and a transcriptomic signature switch of gastric cancer cells. The disclosed top activated genes were further validated in gastric tumors, revealing that SRPX2 and RUNX1 are concomitantly overexpressed in gastric carcinomas and its expression is associated with patients' poor-survival, highlighting their prognosis potential in clinical practice. INTERPRETATION:This study discloses novel molecular links between O-glycans truncation frequently observed in cancer and key cellular regulators with major impact in tumor progression and patients' clinical outcome.

journal_name

EBioMedicine

journal_title

EBioMedicine

authors

Freitas D,Campos D,Gomes J,Pinto F,Macedo JA,Matos R,Mereiter S,Pinto MT,Polónia A,Gartner F,Magalhães A,Reis CA

doi

10.1016/j.ebiom.2019.01.017

subject

Has Abstract

pub_date

2019-02-01 00:00:00

pages

349-362

issn

2352-3964

pii

S2352-3964(19)30017-9

journal_volume

40

pub_type

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