Reprogramming CD8+ T- cell branched N-glycosylation limits exhaustion, enhancing cytotoxicity and tumor killing
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ABSTRACT:
PROVIDER: PRJEB94932 | ENA |
REPOSITORIES: ENA
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Project description:Aberrant glycosylation is a crucial strategy employed by cancer cells to evade cellular immunity. However, homologous recombination (HR) status-dependent glycosylation has never been explored therapeutically. Here, we show that the inhibition of branched N-glycans sensitizes HR-proficient, but not HR-deficient, epithelial ovarian cancers (EOCs) to immune checkpoint blockade (ICB). In contrast to fucosylation whose inhibition sensitizes EOCs to anti-PD-L1 immunotherapy regardless of HR-status, we observe a unique enrichment of branched N-glycans on HR-proficient compared to HR-deficient EOCs. Mechanistically, BRCA1/2 transcriptionally promotes the expression of MGAT5, the enzyme responsible for catalyzing branched N-glycans. The branched N-glycans on HR-proficient tumors augment their resistance to anti-PD-L1 by enhancing its binding with PD-1 on CD8_ T cells. In orthotopic syngeneic EOC mouse models, inhibiting branched N-glycans, using 2-Deoxy-D-glucose, sensitizes HR-proficient, but not HR-deficient EOCs, to anti-PD-L1. These findings indicate branched N-glycans as promising therapeutic targets whose inhibition sensitizes HR-proficient EOCs to ICB by overcoming immune evasion
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Project description:Background: Oligoclonal bands (OCBs) are a hallmark of multiple sclerosis (MS), yet their molecular characteristics and pathogenic relevance remain incompletely understood. Recent evidence suggests that immunoglobulin G (IgG) aggregates and glycosylation may contribute to neuroinflammation and neuronal injury in MS.
Methods: We analyzed paired cerebrospinal fluid (CSF) and plasma samples from MS patients and other neurological controls using transmission electron microscopy, protein aggregation assays, proteomics, isoelectric focusing immunoblotting, and western blots. Neuronal cytotoxicity was assessed using human iPSC-derived neurons and SH-SY5Y cells. IgG glycosylation was evaluated by enzymatic deglycosylation and lectin-based detection.
Results: We identified large IgG aggregates (>100 nm) in MS CSF, which were absent in controls and induced complement-dependent neuronal apoptosis. These aggregates were enriched in OCBs and were disrupted by urea or glycine-HCl, resulting in the loss of OCBs. Proteomic analysis revealed enrichment of IgG subclasses and complement components in MS CSF. In addition, MS CSF contained significantly elevated levels of galactosylated and sialylated IgG compared to paired plasma. Enzymatic removal of glycans reduced both OCB intensity and neuronal cytotoxicity.
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