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Fucosylation of HLA-DRB1 regulates CD4+T cell-mediated anti-melanoma immunity and enhances immunotherapy efficacy: Fucoproteomic profiling of CD4 T cells

ABSTRACT: Immunotherapy efficacy is limited in melanoma, and combinations of immunotherapies with other modalities have yielded limited improvements but also adverse events requiring cessation of treatment. In addition to ineffective patient stratification, efficacy is impaired by paucity of intratumoral immune cells (itICs)—thus, effective strategies to safely increase itICs are needed. We report that dietary administration of L-fucose induces fucosylation and cell surface enrichment of the MHC-II protein HLA-DRB1 in melanoma cells, triggering CD4+T cell-mediated increases in ItICs and anti-tumor immunity, enhancing immune checkpoint blockade responses. Melanoma fucosylation and fucosylated HLA-DRB1 associate with intratumoral T cell abundance and anti-PD1 responder status in patient melanoma specimens, suggesting the potential use of melanoma fucosylation as a strategy for stratifying patients for immunotherapies. Our findings demonstrate that fucosylation is a key mediator of anti-tumor immunity, and importantly, suggest that L-fucose is a powerful agent for safely increasing ItICs and immunotherapy efficacy in melanoma.

INSTRUMENT(S): Q Exactive

ORGANISM(S): Homo Sapiens (human)

TISSUE(S): T Cell

DISEASE(S): Melanoma

SUBMITTER: John Koomen

LAB HEAD: Eric Lau, PhD

PROVIDER: PXD038636 | Pride | 2022-12-16

REPOSITORIES: Pride

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			Action	DRS
	20211122_Lau-Chase_Fuco_ID_AD_AAL_RUN1.raw	Raw
	20211122_Lau-Chase_Fuco_ID_AD_AAL_RUN1.raw__F003605_.dta	Raw
	20211122_Lau-Chase_Fuco_ID_AD_AAL_RUN1.raw__F003605_.mzid.gz	Mzid
	20211122_Lau-Chase_Fuco_ID_AD_AAL_RUN1.raw__F003605_.mzid_20211122_Lau-Chase_Fuco_ID_AD_AAL_RUN1.raw__F003605_.MGF	Mzid
	20211122_Lau-Chase_Fuco_ID_AD_AAL_RUN2.raw	Raw

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Fucosylation of HLA-DRB1 regulates CD4+T cell-mediated anti-melanoma immunity and enhances immunotherapy efficacy: HLA-DRB1 Interactomes

Project description:Immunotherapy efficacy is limited in melanoma, and combinations of immunotherapies with other modalities have yielded limited improvements but also adverse events requiring cessation of treatment. In addition to ineffective patient stratification, efficacy is impaired by paucity of intratumoral immune cells (itICs)—thus, effective strategies to safely increase itICs are needed. We report that dietary administration of L-fucose induces fucosylation and cell surface enrichment of the MHC-II protein HLA-DRB1 in melanoma cells, triggering CD4+T cell-mediated increases in ItICs and anti-tumor immunity, enhancing immune checkpoint blockade responses. Melanoma fucosylation and fucosylated HLA-DRB1 associate with intratumoral T cell abundance and anti-PD1 responder status in patient melanoma specimens, suggesting the potential use of melanoma fucosylation as a strategy for stratifying patients for immunotherapies. Our findings demonstrate that fucosylation is a key mediator of anti-tumor immunity, and importantly, suggest that L-fucose is a powerful agent for safely increasing ItICs and immunotherapy efficacy in melanoma.

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Project description:Despite significant advances in the development and refinement of immunotherapies administered to combat cancer over the past decades, a number of barriers continue to limit their efficacy. One significant clinical barrier is the inability to mount initial immune responses towards the tumor. As dendritic cells are central initiators of immune responses in the body, the elucidation of mechanisms that can be therapeutically leveraged to enhance their functions to drive anti-tumor immune responses is urgently needed. Here, we report that the dietary sugar L-fucose can be used to enhance the immunostimulatory activity of dendritic cells (DCs). L-fucose polarizes immature myeloid cells towards specific DC subsets, specifically cDC1 and moDC subsets. In vitro, L-fucose treatment enhances antigen uptake and processing of DCs. Furthermore, our data suggests that L-fucose-treated DCs increase stimulation of T cell populations. Consistent with our functional assays, single-cell RNA sequencing of intratumoral DCs from tumor-bearing mice confirmed transcriptional regulation and antigen processing as pathways that are significantly altered by dietary L-fucose. Together, this study provides the first evidence of the ability of L-fucose to bolster DC functionality and provides rational to further investigate how L-fucose can be used to leverage DC function in order to enhance current immunotherapy.

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Aberrant L-Fucose accumulation and increased core fucosylation are specific metabolic liabilities in mesenchymal glioblastoma

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