PABPC1L promotes tryptophan metabolism and immune suppression by stabilizing IDO1 in renal cell carcinoma
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PROVIDER: PRJNA1010378 | ENA |
REPOSITORIES: ENA
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Project description:The tumor microenvironment (TME) in renal cell carcinomas (RCC) is marked by substantial immunosuppression and immune resistance though highly infiltrated by T cells. There is an urgent need to elucidate tumor immune evasion and to develop novel therapeutic target to boost the efficacy of immune checkpoint blockade (ICB) in RCC. Our study uncovers a mechanism wherein the polyadenylate-binding protein PABPC1L modulates indoleamine2, 3dioxygenase1 (IDO1), a prospective candidate for immunotherapy. PABPC1L, markedly upregulated in RCC, correlates with unfavorable prognosis and resistance to ICB. Overexpressed PABPC1L bolsters tryptophan metabolism and induces T-cell dysfunction by stabilizing IDO1. Conversely, silencing PABPC1L diminishes IDO1 expression, mitigates cytotoxic T-cell suppression, and enhances responsiveness to anti-PD-1 therapy. Our findings underscore PABPC1L's crucial role in facilitating immune evasion in RCC, making it a potential addition to ICB therapy.
2024-02-14 | GSE241871 | GEO
Project description:The tumor microenvironment (TME) in renal cell carcinomas (RCC) is marked by substantial immunosuppression and immune resistance though highly infiltrated by T cells. There is an urgent need to elucidate tumor immune evasion and to develop novel therapeutic target to boost the efficacy of immune checkpoint blockade (ICB) in RCC. Our study uncovers a mechanism wherein the polyadenylate-binding protein PABPC1L modulates indoleamine2, 3dioxygenase1 (IDO1), a prospective candidate for immunotherapy. PABPC1L, markedly upregulated in RCC, correlates with unfavorable prognosis and resistance to ICB. Overexpressed PABPC1L bolsters tryptophan metabolism and induces T-cell dysfunction by stabilizing IDO1. Conversely, silencing PABPC1L diminishes IDO1 expression, mitigates cytotoxic T-cell suppression, and enhances responsiveness to anti-PD-1 therapy. Our findings underscore PABPC1L's crucial role in facilitating immune evasion in RCC, making it a potential addition to ICB therapy.
2024-02-14 | GSE255448 | GEO
Project description:PABPC1L promotes tryptophan metabolism and immune suppression by stabilizing IDO1 in renal cell carcinoma [RIP-seq]
| PRJNA1075052 | ENA
Project description:IDO1 interacting proteins in two colorectal cancer cells and was subjected to beads, and the beads were washed by buffer and identified by mass spectrometry (MS)
2022-05-05 | PXD033718 |
Project description:Indoleamine 2, 3-dioxygenase 1 (IDO1) is a metabolic enzyme catalyzing the conversion of the essential amino acid tryptophan to kynurenine. It is induced by IFNg and its expression is linked to poor prognosis across various cancer types. T cells are particularly sensitive to IDO1-dependent tryptophan deprivation in the tumor microenvironment, leading to tumor immune resistance. Therefore, IDO1 inhibitors, such as epacadostat, have been developed, aiming to restore T cell antitumor activity. However, a recent phase III trial assessing the clinical benefit of epacadostat with the PD-1 antibody pembrolizumab in melanoma failed. This prompted us to study the role of IDO1, and the effect of its inhibition, on tumor cells that are under IFNg treatment and T cell attack. We showed that IDO1-mediated tryptophan depletion contributes to the anti-tumor effect of CD8 T cells. Thus, while epacadostat expectedly replenished tryptophan -the desired effect-, this led to adverse protection of melanoma cells from T cell-derived IFNg. RNA sequencing and ribosome profiling of (patient-derived) melanoma cell lines revealed that IFNg caused general protein translation shut down, which was reversed by IDO1 inhibition. Impaired translation was accompanied by an amino acid deprivation-dependent stress response driving ATF4high and MITFlow transcriptomic signatures, which was also observed in melanoma patient tumors. Downregulation of MITF in tumors and PDX- derived cell lines upon treatment was strongly predictive of response to response, to checkpoint blockade-treatment and IFNg, respectively. Conversely, MITF restoration in cultured tumor cells caused T cell resistance. These results highlight the critical role of tryptophan in the melanoma response to T cell-derived IFNg, uncovering an unexpected negative consequence of IDO1 inhibition.
2023-01-16 | GSE198460 | GEO
Project description:Indoleamine 2,3 dioxygenase 1 (IDO1) is an attractive target for cancer immunotherapy. However, IDO1 inhibitors have shown disappointing therapeutic efficacy in clinical trials, mainly because of the activation of the aryl hydrocarbon receptor (AhR). Here, we show a post-transcriptional regulatory mechanism of IDO1 regulated by a proteasome-associated deubiquitinating enzyme, USP14, in colorectal cancer (CRC). Overexpression of USP14 promotes tryptophan metabolism and T-cell dysfunction by stabilizing the IDO1 protein. Knockdown of USP14 or pharmacological targeting of USP14 decreases IDO1 expression, reverses suppression of cytotoxic T cells, and increases responsiveness to anti-PD-1 in a MC38 syngeneic mouse model. Importantly, suppression of USP14 has no effects on AhR activation induced by the IDO1 inhibitor. These findings highlight a relevant role of USP14 in post-translational regulation of IDO1 and in the suppression of antitumor immunity, suggesting that inhibition of USP14 may represent a promising strategy for CRC immunotherapy. IDO1-mediated tryptophan metabolism plays an important role in creating an immunosuppressive tumour microenvironment. Here, the authors show that deubiquitinase USP14 regulates immune suppression by inducing IDO1 stabilization and suggest USP14 as a potential therapeutic target to improve immunotherapy in colorectal cancer.
| S-EPMC9513055 | biostudies-literature
Project description:To uncover underlying mechanisms associated with failure of indoleamine 2, 3-dioxygenase 1 (IDO1) blockade in clinical trials, we conducted a pilot, window-of-opportunity clinical study testing the immunological and metabolic effects of the IDO1 inhibitor, epacadostat, in seventeen patients with newly diagnosed advanced high grade serous ovarian cancer prior to their standard tumor debulking surgery. Comprehensive immunologic, transcriptomic, and metabolomic characterization of the tumor microenvironment using baseline and post-treatment tissue biopsies revealed efficient blockade of the kynurenine pathway of tryptophan degradation. This blockade was accompanied by a metabolic adaptation that shunted tryptophan catabolism towards the serotonin pathway and elevated nicotinamide adenine dinucleotide (NAD)+ biosynthetic pathways, which was detrimental for T cell proliferation and function. Treatment of mice bearing IDO1 over-expressing ovarian tumors with the NAMPT inhibitor, FK866, did not improve tumor control by epacadostat. Because NAD+ metabolites could be ligands for purinergic receptors, we investigated the impact of blocking purinergic receptors in the presence of NAD+. We demonstrated that A2a and A2b, or the combination of A2a and A2b purinergic receptor antagonists rescued NAD+-mediated suppression of T cell proliferation, and the combination of IDO inhibition and A2a/A2b receptor blockade improved survival in the IDO1 over-expressing ovarian tumor bearing hosts. These findings unravel previously unrecognized downstream adaptive metabolic consequences of IDO1 blockade that may undermine efforts to induce tumor-specific T cell responses.
2020-12-28 | GSE155164 | GEO
Project description:Transcriptome analysis of U87 cells under different treatments to identify IDO1-regulated genes Indoleamine 2, 3-dioxygenase 1 (IDO1) is a tryptophan (Trp) catabolic enzyme that converts Trp into downstream kynurinine (Kyn). Many studies have indicated that IDO1 is a critical suppressive immune checkpoint molecule invovled in various types of cancer. Canonically, the underlying mechanism of IDO1 immunosuppressive role is related with its enzyme activity, that is the depletion of Trp and accumulation of Kyn lead to increased tumor infiltrating suppressive regulatory T cells. Recent studies, however, challenged this hypothesis and imply that tumor cell-derived IDO1 can mediate immunosuppression independent of its enzyme activity. In this study, we aim to identify genes that are regulated by IDO1 in human glioblastoma cells, a gene expression regulatory function of IDO1 that is indepent of its enzyme activity.
2021-12-10 | GSE175700 | GEO
Project description:Activated T cells secrete interferon-gamma (IFN) that triggers an intra-cellular tryptophan shortage through the activation of the Indoleamine 2,3-Dioxygenase 1 (IDO1) enzyme. Surprisingly, we here show that despite tryptophan depletion, in-frame protein synthesis bypassing tryptophan codons continues. Using mass spectrometry, we identified tryptophan to phenylalanine (W>F) substitution as the major event that facilitates in-frame protein synthesis in IFN-treated and tryptophan-depleted cells. We validated their expression using in vitro reporter assays, and pinpoint tryptophanyl-tRNA synthetase (WARS1) as the candidate gene that accounts for this event. We named these mRNA-translation-driven aberrations ‘substitutants’ to distinguish them from somatic genetic variants. To uncover their biological relevance, we interrogated cancer proteomes and phosphoproteomes of breast, lung and kidney cancers. Interestingly, we specifically identified a high level of tryptic peptides containing W>F substitutants with strong association to IDO1 expression, T cell activity, p53 mutations, and oncogenic MAPK signaling, indicating a role of infiltrating T cells in their production and highlighting cancer relevance. We further show that substitutants can impair protein function and be processed and presented at the cell surface to elicit immune cell recognition. Indeed, immunopeptidomics data from of colorectal-cancer organoids and glioblastoma cell lines revealed a large number of W>F substitutant-peptides being presented on HLA class I molecules following IFN treatment. Thus, W>F substitutants are a novel form of non-genetic mutations induced by tumor-infiltrating T cells with potential impact on gene function and on the repertoire of neopeptides presented by cancer cells.
2021-12-23 | PXD028921 | Pride
Project description:YOD1 promotes renal fibrosis by stabilizing JAK2 through deubiquitination
| PRJNA981128 | ENA