Ablation of the endoplasmic reticulum stress kinase PERK induces paraptosis and type I interferon to promote anti-tumor T cell responses

doi:10.1016/j.ccell.2022.08.016

. 2022 Oct 10;40(10):1145-1160.e9.

doi: 10.1016/j.ccell.2022.08.016. Epub 2022 Sep 22.

Ablation of the endoplasmic reticulum stress kinase PERK induces paraptosis and type I interferon to promote anti-tumor T cell responses

Jessica K Mandula¹, Shiun Chang¹, Eslam Mohamed², Rachel Jimenez¹, Rosa A Sierra-Mondragon¹, Darwin C Chang¹, Alyssa N Obermayer³, Carlos M Moran-Segura⁴, Satyajit Das¹, Julio A Vazquez-Martinez¹, Karol Prieto¹, Ann Chen³, Keiran S M Smalley⁵, Brian Czerniecki¹, Peter Forsyth⁶, Richard C Koya⁷, Brian Ruffell¹, Juan R Cubillos-Ruiz⁸, David H Munn⁹, Timothy I Shaw³, Jose R Conejo-Garcia¹, Paulo C Rodriguez¹⁰

Affiliations

¹ Department of Immunology, H. Lee Moffitt Cancer Center, Tampa, FL 33612, USA.
² California Northstate University, Elk Grove, CA 95757, USA.
³ Department of Biostatistics and Bioinformatics, H. Lee Moffitt Cancer Center, Tampa, FL 33612, USA.
⁴ Department of Pathology, H. Lee Moffitt Cancer Center, Tampa, FL 33612, USA.
⁵ Department of Tumor Biology, H. Lee Moffitt Cancer Center, Tampa, FL 33612, USA.
⁶ Department of NeuroOncology, H. Lee Moffitt Cancer Center, Tampa, FL 33612, USA.
⁷ Department of Obstetrics and Gynecology, University of Chicago, Chicago, IL 60637, USA.
⁸ Department of Obstetrics and Gynecology, Weill Cornell Medicine, New York, NY 10065, USA; Sandra and Edward Meyer Cancer Center, Weill Cornell Medicine, New York, NY 10065, USA.
⁹ Department of Pediatrics, Georgia Cancer Center, Augusta University, Augusta, GA 30912, USA.
¹⁰ Department of Immunology, H. Lee Moffitt Cancer Center, Tampa, FL 33612, USA. Electronic address: Paulo.Rodriguez@Moffitt.org.

PMID: 36150390
PMCID: PMC9561067
DOI: 10.1016/j.ccell.2022.08.016

Ablation of the endoplasmic reticulum stress kinase PERK induces paraptosis and type I interferon to promote anti-tumor T cell responses

Jessica K Mandula et al. Cancer Cell. 2022.

. 2022 Oct 10;40(10):1145-1160.e9.

doi: 10.1016/j.ccell.2022.08.016. Epub 2022 Sep 22.

Authors

Affiliations

¹ Department of Immunology, H. Lee Moffitt Cancer Center, Tampa, FL 33612, USA.
² California Northstate University, Elk Grove, CA 95757, USA.
³ Department of Biostatistics and Bioinformatics, H. Lee Moffitt Cancer Center, Tampa, FL 33612, USA.
⁴ Department of Pathology, H. Lee Moffitt Cancer Center, Tampa, FL 33612, USA.
⁵ Department of Tumor Biology, H. Lee Moffitt Cancer Center, Tampa, FL 33612, USA.
⁶ Department of NeuroOncology, H. Lee Moffitt Cancer Center, Tampa, FL 33612, USA.
⁷ Department of Obstetrics and Gynecology, University of Chicago, Chicago, IL 60637, USA.
⁸ Department of Obstetrics and Gynecology, Weill Cornell Medicine, New York, NY 10065, USA; Sandra and Edward Meyer Cancer Center, Weill Cornell Medicine, New York, NY 10065, USA.
⁹ Department of Pediatrics, Georgia Cancer Center, Augusta University, Augusta, GA 30912, USA.
¹⁰ Department of Immunology, H. Lee Moffitt Cancer Center, Tampa, FL 33612, USA. Electronic address: Paulo.Rodriguez@Moffitt.org.

PMID: 36150390
PMCID: PMC9561067
DOI: 10.1016/j.ccell.2022.08.016

Abstract

Activation of unfolded protein responses (UPRs) in cancer cells undergoing endoplasmic reticulum (ER) stress promotes survival. However, how UPR in tumor cells impacts anti-tumor immune responses remains poorly described. Here, we investigate the role of the UPR mediator pancreatic ER kinase (PKR)-like ER kinase (PERK) in cancer cells in the modulation of anti-tumor immunity. Deletion of PERK in cancer cells or pharmacological inhibition of PERK in melanoma-bearing mice incites robust activation of anti-tumor T cell immunity and attenuates tumor growth. PERK elimination in ER-stressed malignant cells triggers SEC61β-induced paraptosis, thereby promoting immunogenic cell death (ICD) and systemic anti-tumor responses. ICD induction in PERK-ablated tumors stimulates type I interferon production in dendritic cells (DCs), which primes CCR2-dependent tumor trafficking of common-monocytic precursors and their intra-tumor commitment into monocytic-lineage inflammatory Ly6C⁺CD103⁺ DCs. These findings identify how tumor cell-derived PERK promotes immune evasion and highlight the potential of PERK-targeting therapies in cancer immunotherapy.

Keywords: PERK; immunogenic cell death; tumor immunity; type I IFN; unfolded protein responses.

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Conflict of interest statement

Declaration of interests The authors declare no competing interests.

Figures

**Figure 1:. PERK in melanoma cells limits anti-tumor T cell immunity**
(A) Overall survival in melanoma patients from Skin Cutaneous Melanoma datasets (TCGA, Moffitt, and ICI treated) stratified by PERK mRNA signature scores calculated by GSVA. Samples were categorized based on a median split of the signature score: (TCGA: n= 228 above and n= 229 below; Moffitt n=59 above and n= 58 below; ICI treated n=35 above and n=34 below). (B) PERK signaling score was applied into ICI treated melanoma patients and categorized into Responders (R, n=19) or Non-Responders (NR, n=49) as annotated by the CRI iAtlas portal. Data are the median (gray dashed line) from the min to max and width is the population frequency at that interval. (C) Illustrative images by Automated Multispectral Imaging (400μm and 100μm) of 133 metastatic melanoma tumors showing SOX10 (Cyan), phospho-PERK (Orange), CD45 (Green), CD4 (Magenta), CD8 (Yellow) and DAPI (Blue). Samples were ranked as PERK^high or PERK^low as in the Methods. (D) Proportion of intra-tumor CD4⁺ (*left*) and CD8⁺ (*right*) T cells in DAPI⁺ cells in the stratified groups of phospho-PERK in SOX10⁺ cells from (C). Data are the median (bold horizontal line) ± quartiles (light horizontal line) with n= 33 (Low) and 36 (High). (E-F) Tumor volume ± SEM in C57BL/6 mice bearing wildtype (WT), Scramble or PERK^KO B16 (E, n=29/group), or SM1 (F, n=9/group) tumors. (G) Total tumor volume ± SEM in tamoxifen-treated *Eif2ak3*^fl/+ or *Eif2ak3*^fl/fl *Braf*^V600E/+;*Pten*^fl/fl;*Tyrosinase*-Cre^ERT2 mice vs. *Braf*^V600E/+;*Pten*^fl/fl;*Tyrosinase*-Cre^ERT2 mice (n=12/group). (H) Tumor volume ± SEM of B16, B16 Scramble, and B16 PERK^KO cells (*left*), as well as SM1 counterparts (*right*) injected into C57BL/6 (Wild Type, WT) or *Rag1*^−/− mice. n=8/group. (I) Tumor growth ± SEM in mice bearing B16 Scramble or B16 PERK^KO tumors (*left*), or SM1 counterparts (*right*), treated with isotype, anti-CD4, or anti-CD8. n=5/group. (J-M) Percentage ± SEM of intra-tumor CD8⁺ T cells in CD45⁺ cells (J), and CD69⁺CD44⁺ (K), IFNγ⁺TNFα⁺ (L), and gp 100-reactive EGSRNQDWL-H-2D^b-tetramer⁺ cells in intra-tumor CD8⁺ T cells (M) from WT, Scramble and PERK^KO B16 tumors at day 17 post-injection. n=10-15/group. (N) Proportion (mean ± SEM) of EGSRNQDWL-H-2D^b-tetramer⁺ intra-tumor CD8⁺ T cells from tamoxifen-exposed *Eif2ak3*^fl/+ *or Eif2ak3*^fl/fl *Braf*^V600E/+;*Pten*^fl/fl;*Tyrosinase*-Cre^ERT2 mice vs. *Braf*^V600E/+;*Pten*^fl/fl;*Tyrosinase*-Cre^ERT2 mice. n=3-8/group. (O) Proportion ± SEM of CD8⁺PD-1⁺ in CD45⁺ cells from WT, Scramble or PERK^KO B16 tumors. (P) Tumor volume ± SEM in mice bearing Scramble or PERK^KO B16 tumors and treated with isotype or anti-PD-1. n=4/group. (Q) Tamoxifen-exposed *Braf*^V600E/+;*Pten*^fl/fl;*Tyrosinase*-Cre^ERT2 mice carrying ~150 mm³ tumors were treated with vehicle or AMG44. Tumor volume normalized to initial treatment volume. n=9/group. (R) Tumor volume ± SEM in WT and *Rag1*^−/− mice bearing B16 (*left*) or SM1 (*right*) tumors and treated after day 6 post-tumor injection with AMG44 (12.5 mg/kg). n=10/group. Statistics applied using one-way ANOVA (E – L, N, P – R), Student’s t-test (D, M, O), Mann-Whitney t-test (B), or log-rank test (A). *, p<0.05; **, p<0.01; ***, p < 0.001; ****, p < 0.0001. Please also see Figure S1.

**Figure 2:. PERK ablation sensitizes melanoma cells to ER stress-induced paraptosis**
(A) Annexin V⁺ mean percentage ± SEM in Scramble and PERK^KO B16 (*left*) or SM1 (*right*) tumors cultured for 24 hours with or without Thaps. n=3-7 of 3 independent repeats. (B) Representative histograms from 3 distinct repeats showing ER Tracker Green in Scramble and PERK^KO B16 cells treated as in (A). (C) Mean fluorescence intensity (MFI) via flow cytometry ± SEM of NIAD4-bound protein aggregates in Scramble and PERK^KO B16 cells treated as in (A). n=4-7/group of 3 independent repeats. (D) Representative histograms from 3 repeats for fluorescent click chemistry-based detection of O-propargyl-puromycin (OPP) incorporation in Scramble and PERK^KO B16 cells treated as in (A). (E) Light microscopy morphology (100μm and 20X digital magnification) of Scramble and PERK^KO B16 cells cultured in the presence of vehicle, Thaps, or Tunicamycin; in the absence of Glucose or Serum; or with 25% TES. (F) SEC61β (MFI ± SEM) in eGFP⁺ Scramble and PERK^KO B16 tumors from mice. n=6/group. (G) Annexin V⁺ percentage ± SEM in Scramble and PERK^KO B16 cells transfected with untargeted control or *Sec61b* siRNA and treated as in (A). n=3/group. (H) Light microscopy morphology in PERK^KO B16 cells transfected with mock or *Sec61b* siRNA prior to Thaps exposure. (I) Percentage ± SEM of DiOC₂ low cells in B16 cells transfected with untargeted or *Atf4* siRNA and treated as in (A). n=4-5/group. (J) ATP in supernatants from Scramble or PERK^KO B16 cells incubated or not with Thaps. Data are the normalized relative light units (nRLU) ± SEM of n=12-15/group. (K) ExoCRT fold change (MFI ± SEM) in Scramble or PERK^KO B16 cells cultured as in (A). n=4-7/group. (L-M) Extracellular ATP (L) and ExoCRT (M) ± SEM in Scramble or PERK^KO B16 cells carrying mock or *Sec61b* siRNA and cultured with or without Thaps. n=6-10/group (L); n=3-4/group (M). Statistics applied using one-way ANOVA (A, C, F, G, I – M) or Student’s t-test (F), *, p<0.05; **, p<0.01; ****, p < 0.0001. Please also see Figure S2.

**Figure 3:. PERK deletion in cancer cells provokes ICD-driven anti-tumor immunity**
(A-B) ER Tracker Green (A) and CRANAD-labeled protein aggregates (B) by flow cytometry (MFI ± SEM) in CD45⁻ cells from Scramble and PERK^KO B16 tumors from mice. n=9/group. (C-D) ATP (C) and HMGB1 (D) (mean ± SEM) in supernatants from resected Scramble or PERK^KO B16 tumors cultured for 24 hours. n=8-12/group (C); n=6-8/group (D). (E) ExoCRT (MFI ± SEM) in CD45⁻ cells from freshly isolated Scramble or PERK^KO B16 tumors. n=12/group. (F) Relative expression of *Ifnb1*, *Isg15* and *Ifit3* mRNA ± SEM in bulk wildtype, Scramble or PERK^KO B16 tumors from mice. n=13-15/group. (G) Overall survival for Skin Cutaneous Melanoma patients (TCGA, PanCancer Atlas) stratified by the median ICD metagene signature score. Kaplan-Meier curves of overall survival for ICD high (above the median; n = 228) and low (below the median; n = 229). Gene signature calculation by GSVA. (H) Mice injected with WT SM1 tumors on the left flank for 10 days later, were implanted with WT (Group 1) or PERK^KO (Group 2) SM1 cells on the right flank. Mice were injected with SM1 PERK^KO cells on the left flank, followed by injection 10 days later with WT (Group 3) or PERK^KO (Group 4) SM1 tumors on the right flank. Tumor growth ± SEM. n=10/group. (I) WT SM1 tumor growth ± SEM in naïve mice or mice that had rejected PERK^KO SM1 tumors. n=10/group. (J) Volume ± SEM for SM1 (*left* flank; SM1 WT) and LLC (*right* flank; LLC WT) tumors in naïve mice and mice that previously rejected PERK^KO SM1 tumors. n=5/group. Statistics applied by one-way ANOVA (F, I, J), Student’s t-test (A – E), or log-rank test (G). *, p<0.05; **, p<0.01; ***, p < 0.001; ****, p < 0.0001. Please also see Figure S3.

**Figure 4:. PERK in cancer cells regulates accumulation of MoDCs**
(A-B) Percentage of CD11b⁺Gr1⁺ (A) and CD11c⁺MHC-II⁺ (B) cells ± SEM in CD45⁺ cells in tumors from mice bearing wildtype (WT), Scramble or PERK^KO B16 tumors for 17 days. n=9/group (A); n=15/group (B). (C) Volume ± SEM of Scramble and PERK^KO B16 tumors implanted into *Itgax*^DTR/EGFP mice treated with vehicle or diphtheria toxin. n=8/group. (D) Percentage of CD44⁺CD69⁺ ± SEM in CD8⁺ Pmel T cells co-cultured for 48 hours with sorted CD11c⁺ cells from Scramble or PERK^KO B16 tumors (ratio 1:1/4). n=3/group. (E) Proportion ± SEM of MoDCs, cDC1, and cDC2 in CD11c⁺MHC-II⁺ cells from WT, Scramble, or PERK^KO B16 tumors. n=15/group. (F-G) MoDCs percentage ± SEM within CD11c⁺MHC-II⁺ cells in tumors from tamoxifen-treated *Eif2ak3*^fl/+ *or Eif2ak3*^fl/fl *Braf*^V600E/+;*Pten*^fl/fl;*Tyrosinase*-Cre^ERT2 mice vs. *Braf*^V600E/+;*Pten*^fl/fl;*Tyrosinase*-Cre^ERT2 mice (F) or from tamoxifen-exposed *Braf*^V600E/+;*Pten*^fl/fl;*Tyrosinase*-Cre^ERT2 mice treated with vehicle (Veh) or AMG44 (G). n=3-7/group (F); n=8/group (G). (H) Levels of CD80, CD86, or CD40 (MFI ± SEM) in cDC1, cDC2, and MoDCs from Scramble and PERK^KO B16 tumors. n=8/group. (I) Representative histograms of eGFP in intra-tumor-MoDCs, cDC1 or cDC2 from B16-eGFP⁺ Scramble and B16-eGFP PERK^KO-bearing mice. Representative of n=5/group. Statistics applied using one-way ANOVA (A – C, E, F) or Student’s t-test (D, G, H), *, p<0.05; ***, p < 0.001; ****, p < 0.0001. Please also see Figure S4.

**Figure 5:. PERK in tumor cells controls cMoP to MoDC ontogeny**
(A) Percentage ± SEM of cMoPs (cKit/CD117⁺CSFR1/CD115^LowCD135⁻Ly6C⁺) in bone marrows (*left*), spleens (*middle*), and tumors (*right*) from mice implanted for 17 days with Scramble or PERK^KO B16 tumors. n=7/group (*left*), n=8-10/group (*middle*), n=12-14 (*right*). (B) Percentage ± SEM of cMoPs within CD45⁺ cells in tumors from tamoxifen-exposed *Eif2ak3*^fl/+ *or Eif2ak3*^fl/fl *Braf*^V600E/+;*Pten*^fl/fl;*Tyrosinase*-Cre^ERT2 mice vs. *Braf*^V600E/+;*Pten*^fl/fl;*Tyrosinase*-Cre^ERT2 controls (*left*) or in tumors from tamoxifen-exposed *Braf*^V600E/+;*Pten*^fl/fl;*Tyrosinase*-Cre^ERT2 mice treated with vehicle or AMG44 (*right*). n=3-8/group (*left*), n=4-5/group (*right*). (C) Percentage ± SEM of MoDCs (CD11b⁺CD11c⁺MHC-II⁺Ly6C⁺CD103⁺) within cMoPs from tumors (*left*) and spleens (*right*) of mice bearing Scramble and PERK^KO B16 tumors for 17 days. n=7-9/group (*left*), n=4-5/group (*right*). (D) Cell trace violet (CTV)-labeled splenic cKit⁺ cells were transferred into Scramble or PERK^KO B16 tumors (*left*), and percentage of MoDCs ± SEM in CTV⁺ cells tested in tumors after 24 hours by flow cytometry (*right*). n=8-10/group (*left*), n=6/group (*right*). (E) Splenic cKit⁺ cells from Scramble or PERK^KO B16-bearing mice were cultured for 48 hours with mGM-CSF and tested for MoDCs differentiation. Data show percentage of MoDCs ± SEM in cKit⁺ cells. (F-H) Mice received Sham Surgery or splenectomy and 14 days later, Scramble or PERK^KO B16 tumors were injected on the opposite flank. A group of mice additionally received adoptive transfer (ACT) of splenic cKit⁺ cells on days 9 and 14 post-tumor injection (arrows). Tumor volume ± SEM (F), and percentage ± SEM of intra-tumor cMoPs (G) or MoDCs (H) were then tested. n=5/group. (I) Chemokine multiplex heatmap from Scramble or PERK^KO B16 tumor homogenates from 5 mice/group. (J) CCR2 MFI ± SEM in intra-tumor cMoPs from Scramble and PERK^KO B16 tumors. n=4/group. (K) Tumor growth ± SEM in mice bearing Scramble or PERK^KO B16 tumors and treated with vehicle or BMS-CCR2-22 (0.5 mg/kg) daily starting since tumor inoculation. n=5/group. (L) Tumor volume ± SEM in Scramble or PERK^KO B16 tumors injected into wildtype or *Ccr2*^−/− mice. n=5/group. (M) Percentage ± SEM of intra-tumor cMoPs (in CD45⁺, *left*) and MoDCs (in CD11c⁺MHC-II⁺, *right*) in wildtype and *Ccr2*^−/− mice bearing Scramble or PERK^KO B16 tumors. n=4/group (*left*), n=8-10/group (*right*). Statistics were applied using one-way ANOVA (B *left*, F – H, K – M) or Student’s t-test (A, B *right*, C, D, E, I, J) *, p<0.05; **, p<0.01; ***, p < 0.001; ****, p < 0.0001. Please also see Figure S5.

**Figure 6:. Host-derived Type I IFN drives anti-tumor immune responses in PERK^KO tumors**
(A) Volcano plot indicating MoDC-linked transcripts from RNA-seq on cKit⁺ cells from control or PERK^KO B16 tumors. Transcripts differentially (p < 0.05) elevated after PERK deletion are shown in red (log2 fold change > 1), and downregulated transcripts are in teal (log2 fold change < −1). n=4/group. (B) Selected RNA-seq transcripts of cKit⁺ cells from Scramble and PERK^KO B16 tumors. Heatmap (*top*) showing differentially expressed type I IFNs-regulated transcripts (log2 transformed then z-score normalized). GSEA of IFN pathways from MSigDB (*bottom*). (C) Tumor volume ± SEM in mice bearing Scramble or PERK^KO B16 tumors and treated with αIFNAR1 antibody or isotype (ISO). n=10/group. (D) Percentage ± SEM of cMoPs in tumor-CD45⁺ (*left*) and MoDCs in tumor-CD11c⁺MHC-II⁺ cells (*right*) from (C). n=4-13/group (*left*), n=7-9/group (*right*). (E) Tumor growth ± SEM in Scramble, PERK^KO, Scramble *Ifnb1*^KO and PERK^KO;*Ifnb1*^KO B16 tumors implanted into mice. n=5/group. (F) Volume ± SEM of Scramble or PERK^KO B16 tumors injected into wildtype (WT) or *Ifnar1*^−/− mice. n=7-10/group. (G) Percentage ± SEM of tumor-linked cMoPs (*left*) and MoDCs (*right*) in Scramble or PERK^KO B16 tumors implanted into WT *or Ifnar1*^−/− mice. n=4-7/group. (H) Proportion ± SEM of EGSRNQDWL-H-2D^b-tetramer⁺ CD8⁺ T cells in tumors from WT or *Ifnar1*^−/− mice injected with Scramble or PERK^KO B16 tumors. n=4-7/group. (I) CCR2 (MFI ± SEM) in tumor-cMoPs from Scramble or PERK^KO B16 tumors implanted into WT or *Ifnar1*^−/− mice. n=4-5/group. Statistics applied using one-way ANOVA (C – I), *, p<0.05; **, p<0.01; ***, p<0.001; ****, p < 0.0001. Please also see Figure S6.

**Figure 7:. Type I IFN from DCs promotes migration and commitment of cMoPs into MoDCs in PERK-null tumors via STAT1**
(A-B) IFNβ1-EYFP (MFI ± SEM) in Macrophages, MDSCs, cMoPs, and DCs (A), and cDC1, cDC2, or MoDCs (B) from Scramble or PERK^KO B16 tumors from mice. n=3-4/group. (C) IFNβ1-EYFP (MFI ± SEM) in splenic MoDCs from Scramble or PERK^KO B16 tumor-bearing mice. n=4/group. (D) IFNβ1-EYFP in splenic CD11c⁺ cells (MFI ± SEM) cultured with supernatants from Scramble or PERK^KO B16 cells previously treated or not with Thaps, extensively washed, and cultured for 18 hours in regular media. n=6-9/group. (E) IFNβ1-EYFP MFI ± SEM in splenic CD11c⁺ cells exposed as in (D) and pretreated with EvB, PPADS or anti-HMGB1. n=6/group. (F) pSTAT1 (MFI ± SEM) in intra-tumor cMoPs from wildtype (WT) or *Ifnar1*^−/− mice bearing Scramble or PERK^KO B16 tumors. n=2-5/group. (G-H) Cell trace violet (CTV)-labeled splenic cKit⁺ cells from tumor-free mice were treated with vehicle or fludarabine (STAT1i, 100 μM) (G), or collected from WT or STAT1-null mice (H) and transferred into Scramble or PERK^KO B16 tumors. Percentage of MoDCs in CTV⁺ cells tested in tumors 24 hours later. n=5-10/group (G); n=4-11/group (H). Statistics were applied using one-way ANOVA (E – H) or a Student’s t-test (A – D), *, p<0.05; **, p<0.01; ***, p < 0.001; ****, p < 0.0001. Please also see Figure S7.

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References

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[1] Anders S, Pyl PT, and Huber W (2015). HTSeq--a Python framework to work with high-throughput sequencing data. Bioinformatics 31, 166–169. 10.1093/bioinformatics/btu638. - DOI - PMC - PubMed

[2] Anders S, Pyl PT, and Huber W (2015). HTSeq--a Python framework to work with high-throughput sequencing data. Bioinformatics 31, 166–169. 10.1093/bioinformatics/btu638. - DOI - PMC - PubMed

[3] Atkins C, Liu Q, Minthorn E, Zhang SY, Figueroa DJ, Moss K, Stanley TB, Sanders B , Goetz A, Gaul N, et al. (2013). Characterization of a novel PERK kinase inhibitor with antitumor and antiangiogenic activity. Cancer Res. 73, 1993–2002. - PubMed

[4] Atkins C, Liu Q, Minthorn E, Zhang SY, Figueroa DJ, Moss K, Stanley TB, Sanders B , Goetz A, Gaul N, et al. (2013). Characterization of a novel PERK kinase inhibitor with antitumor and antiangiogenic activity. Cancer Res. 73, 1993–2002. - PubMed

[5] Bezu L, Sauvat A, Humeau J, Gomes-da-Silva LC, Iribarren K, Forveille S, Garcia P, Zhao L, Liu P, Zitvogel L, et al. (2018). eIF2alpha phosphorylation is pathognomonic for immunogenic cell death. Cell Death Differ 25, 1375–1393. 10.1038/s41418-017-0044-9. - DOI - PMC - PubMed

[6] Bezu L, Sauvat A, Humeau J, Gomes-da-Silva LC, Iribarren K, Forveille S, Garcia P, Zhao L, Liu P, Zitvogel L, et al. (2018). eIF2alpha phosphorylation is pathognomonic for immunogenic cell death. Cell Death Differ 25, 1375–1393. 10.1038/s41418-017-0044-9. - DOI - PMC - PubMed

[7] Bi M, Naczki C, Koritzinsky M, Fels D, Blais J, Hu N, Harding H, Novoa I, Varia M, Raleigh J, et al. (2005). ER stress-regulated translation increases tolerance to extreme hypoxia and promotes tumor growth. EMBO J. 24, 3470–3481. - PMC - PubMed

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Ablation of the endoplasmic reticulum stress kinase PERK induces paraptosis and type I interferon to promote anti-tumor T cell responses

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Ablation of the endoplasmic reticulum stress kinase PERK induces paraptosis and type I interferon to promote anti-tumor T cell responses

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