DENR controls JAK2 translation to induce PD-L1 expression for tumor immune evasion [CRISPR screen]
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA762899 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR15880941.fastq.gz | Fastqsanger.gz | |||
| SRR15880942.fastq.gz | Fastqsanger.gz | |||
| SRR15880943.fastq.gz | Fastqsanger.gz | |||
| SRR15880944.fastq.gz | Fastqsanger.gz | |||
| SRR15880945.fastq.gz | Fastqsanger.gz |
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Project description:RNA-binding proteins (RBPs) can recognize thousands of RNAs that help to maintain cell homeostasis, and RBP dysfunction is frequently observed in various cancers. However, whether specific RBPs are involved in tumor immune evasion by regulating programmed death ligand-1 (PD-L1) is unclear. We performed targeted RBP CRISPR/Cas9 screening and identified density regulated re-initiation and release factor (DENR) as a PD-L1 regulator. DENR-depleted cancer cells exhibited reduced PD-L1 expression in vitro and in vivo. DENR depletion significantly suppressed tumor growth and enhanced the tumor-killing activity of CD8+ T cells. Mechanistically, DENR antagonized the translational repression of three consecutive upstream open reading frames (uORFs) upstream of Janus kinase 2 (JAK2); thus, DENR deficiency impaired JAK2 translation and the IFNγ-JAK-STAT signaling pathway, resulting in reduced PD-L1 expression in tumors. Overall, we discovered that the RBP DENR is a novel regulator in PD-L1 expression and highlighted the potential of DENR as a therapeutic target for immunotherapy.
2022-02-28 | GSE184048 | GEO
Project description:To identify the potential signaling pathway involved in DENR KO cells upon PD-L1 production, we harvested IFNγ-treated control and DENR KO cells for RNA-seq. Bioinformatic analysis of the RNA-seq data showed that 114 genes, including PD-L1, were significantly downregulated in DENR KO cells, and multiple classical signaling pathways, including JAK-STAT, and PD-L1, were enriched.
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Project description:DENR controls JAK2 translation to induce PD-L1 expression for tumor immune evasion
| PRJNA762565 | ENA
Project description:RNA-binding proteins (RBPs) can recognize thousands of RNAs that help to maintain cell homeostasis, and RBP dysfunction is frequently observed in various cancers. However, whether specific RBPs are involved in tumor immune evasion by regulating programmed death ligand-1 (PD-L1) is unclear. Here, we perform targeted RBP CRISPR/Cas9 screening and identify density regulated re-initiation and release factor (DENR) as a PD-L1 regulator. DENR-depleted cancer cells exhibit reduced PD-L1 expression in vitro and in vivo. DENR depletion significantly suppresses tumor growth and enhances the tumor-killing activity of CD8+ T cells. Mechanistically, DENR antagonizes the translational repression of three consecutive upstream open reading frames (uORFs) upstream of Janus kinase 2 (Jak2); thus, DENR deficiency impairs JAK2 translation and the IFNγ-JAK-STAT signaling pathway, resulting in reduced PD-L1 expression in tumors. Overall, we discover an RBP DENR that could regulate PD-L1 expression for tumor immune evasion, and highlight the potential of DENR as a therapeutic target for immunotherapy.
| S-EPMC9018773 | biostudies-literature
Project description:A tumor specific super-enhancer drives immune evasion by guiding synchronous expression of PD-L1 and PD-L2
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Project description:The aim was to identify transcripts that are poorly translated upon knockdown of DENR. Lysates from control (GFP) and DENR knockdown S2 cells were run on polysome gradients. RNA from the (80S peak + polysome peaks) was isolated and analyzed by microarrays. In parallel, total RNA from the cells was also profiled as a normalization control and profiled. The 'translation score' of translated mRNA to total RNA was then calculated for control and DENR knockdown cells. Two biological replicates for DENR knockdown and GFP knockdown were performed. For each sample, (80S+polysomes) and total RNA were profiled, leading to 8 samples in total.
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Project description:The inhibitor of DNA-binding protein ID3 is a vital component of immune cells and has been associated with the progression of colorectal cancer (CRC). Despite its significance, its specific role in the immune evasion strategies utilized by CRC remains unclear. RNA-seq analysis revealed that ID3 is associated with the PD-L1 immune checkpoint. We further demonstrated that ID3 modulates PD-L1 expression, suppresses the infiltration and activation of CD8+ T cells, and facilitates the immune escape of CRC cells. Additionally, we found that the knockdown of ID3 significantly enhanced the effectiveness of PD-L1 antibody treatment in combating CRC, reduced the upregulation of PD-L1 induced by the antibody, and altered the immune microenvironment within CRC. Mechanistically, our biological and structural analyses demonstrated that ID3 reconstructed the four-dimensional structure of MYC, thereby enhancing its binding affinity to the PD-L1 promoter and augmenting PD-L1 transcriptional activity. By integrating analysis of ChIP-seq, RNA-seq, and ImmPort gene sets, we found that ID3's DNA-assisted binding function was widespread and could either enhance or suppress gene transcription, not only affecting tumor immune escape through immune checkpoints, but also regulating various cytokines and immune cells involved in tumor immunity. In conclusion, our study uncovered a new mechanism by which ID3 promotes immune evasion in CRC and targeting ID3 may improve the efficacy of anti-PD-1/PD-L1 immunotherapy.
2024-09-30 | GSE275455 | GEO
Project description:The inhibitor of DNA-binding protein ID3 is a vital component of immune cells and has been associated with the progression of colorectal cancer (CRC). Despite its significance, its specific role in the immune evasion strategies utilized by CRC remains unclear. RNA-seq analysis revealed that ID3 is associated with the PD-L1 immune checkpoint. We further demonstrated that ID3 modulates PD-L1 expression, suppresses the infiltration and activation of CD8+ T cells, and facilitates the immune escape of CRC cells. Additionally, we found that the knockdown of ID3 significantly enhanced the effectiveness of PD-L1 antibody treatment in combating CRC, reduced the upregulation of PD-L1 induced by the antibody, and altered the immune microenvironment within CRC. Mechanistically, our biological and structural analyses demonstrated that ID3 reconstructed the four-dimensional structure of MYC, thereby enhancing its binding affinity to the PD-L1 promoter and augmenting PD-L1 transcriptional activity. By integrating analysis of ChIP-seq, RNA-seq, and ImmPort gene sets, we found that ID3's DNA-assisted binding function was widespread and could either enhance or suppress gene transcription, not only affecting tumor immune escape through immune checkpoints, but also regulating various cytokines and immune cells involved in tumor immunity. In conclusion, our study uncovered a new mechanism by which ID3 promotes immune evasion in CRC and targeting ID3 may improve the efficacy of anti-PD-1/PD-L1 immunotherapy.
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