ABSTRACT
T cells are critical effectors of cancer immunotherapies, but little is known about their gene expression programs in diffuse gliomas. Here, we leverage single-cell RNA sequencing (RNA-seq) to chart the gene expression and clonal landscape of tumor-infiltrating T cells across 31 patients with isocitrate dehydrogenase (IDH) wild-type glioblastoma and IDH mutant glioma. We identify potential effectors of anti-tumor immunity in subsets of T cells that co-express cytotoxic programs and several natural killer (NK) cell genes. Analysis of clonally expanded tumor-infiltrating T cells further identifies the NK gene KLRB1 (encoding CD161) as a candidate inhibitory receptor. Accordingly, genetic inactivation of KLRB1 or antibody-mediated CD161 blockade enhances T cell-mediated killing of glioma cells in vitro and their anti-tumor function in vivo. KLRB1 and its associated transcriptional program are also expressed by substantial T cell populations in other human cancers. Our work provides an atlas of T cells in gliomas and highlights CD161 and other NK cell receptors as immunotherapy targets.
Subject(s)
Glioma/immunology , NK Cell Lectin-Like Receptor Subfamily B/genetics , T-Lymphocytes/immunology , Animals , Antigens, Neoplasm , Disease Models, Animal , Gene Expression Profiling , Glioma/genetics , Killer Cells, Natural/immunology , Lectins, C-Type/genetics , Lymphocytes, Tumor-Infiltrating/immunology , Mice , Receptors, Cell Surface/genetics , Single-Cell Analysis , T-Lymphocyte Subsets/immunology , T-Lymphocytes/cytology , Tumor EscapeABSTRACT
RAS family members are the most frequently mutated oncogenes in human cancers. Although KRAS(G12C)-specific inhibitors show clinical activity in patients with cancer1-3, there are no direct inhibitors of NRAS, HRAS or non-G12C KRAS variants. Here we uncover the requirement of the silent KRASG60G mutation for cells to produce a functional KRAS(Q61K). In the absence of this G60G mutation in KRASQ61K, a cryptic splice donor site is formed, promoting alternative splicing and premature protein termination. A G60G silent mutation eliminates the splice donor site, yielding a functional KRAS(Q61K) variant. We detected a concordance of KRASQ61K and a G60G/A59A silent mutation in three independent pan-cancer cohorts. The region around RAS Q61 is enriched in exonic splicing enhancer (ESE) motifs and we designed mutant-specific oligonucleotides to interfere with ESE-mediated splicing, rendering the RAS(Q61) protein non-functional in a mutant-selective manner. The induction of aberrant splicing by antisense oligonucleotides demonstrated therapeutic effects in vitro and in vivo. By studying the splicing necessary for a functional KRAS(Q61K), we uncover a mutant-selective treatment strategy for RASQ61 cancer and expose a mutant-specific vulnerability, which could potentially be exploited for therapy in other genetic contexts.
Subject(s)
Neoplasms , Proto-Oncogene Proteins p21(ras) , Silent Mutation , Alternative Splicing/genetics , Humans , Neoplasms/drug therapy , Neoplasms/genetics , Oligonucleotides, Antisense/genetics , Oligonucleotides, Antisense/therapeutic use , Oncogenes/genetics , Proto-Oncogene Proteins p21(ras)/genetics , RNA Splice Sites/geneticsABSTRACT
Epigenetic aberrations are widespread in cancer, yet the underlying mechanisms and causality remain poorly understood1-3. A subset of gastrointestinal stromal tumours (GISTs) lack canonical kinase mutations but instead have succinate dehydrogenase (SDH) deficiency and global DNA hyper-methylation4,5. Here, we associate this hyper-methylation with changes in genome topology that activate oncogenic programs. To investigate epigenetic alterations systematically, we mapped DNA methylation, CTCF insulators, enhancers, and chromosome topology in KIT-mutant, PDGFRA-mutant and SDH-deficient GISTs. Although these respective subtypes shared similar enhancer landscapes, we identified hundreds of putative insulators where DNA methylation replaced CTCF binding in SDH-deficient GISTs. We focused on a disrupted insulator that normally partitions a core GIST super-enhancer from the FGF4 oncogene. Recurrent loss of this insulator alters locus topology in SDH-deficient GISTs, allowing aberrant physical interaction between enhancer and oncogene. CRISPR-mediated excision of the corresponding CTCF motifs in an SDH-intact GIST model disrupted the boundary between enhancer and oncogene, and strongly upregulated FGF4 expression. We also identified a second recurrent insulator loss event near the KIT oncogene, which is also highly expressed across SDH-deficient GISTs. Finally, we established a patient-derived xenograft (PDX) from an SDH-deficient GIST that faithfully maintains the epigenetics of the parental tumour, including hypermethylation and insulator defects. This PDX model is highly sensitive to FGF receptor (FGFR) inhibition, and more so to combined FGFR and KIT inhibition, validating the functional significance of the underlying epigenetic lesions. Our study reveals how epigenetic alterations can drive oncogenic programs in the absence of canonical kinase mutations, with implications for mechanistic targeting of aberrant pathways in cancers.
Subject(s)
Carcinogenesis/genetics , Chromosome Aberrations , Gastrointestinal Stromal Tumors/genetics , Gastrointestinal Stromal Tumors/pathology , Oncogenes/genetics , Succinate Dehydrogenase/deficiency , Animals , CRISPR-Cas Systems/genetics , DNA Methylation , Enhancer Elements, Genetic/genetics , Epigenesis, Genetic , Fibroblast Growth Factor 4/genetics , Gastrointestinal Stromal Tumors/enzymology , Humans , Mice , Mutation , Proto-Oncogene Proteins c-kit/antagonists & inhibitors , Receptors, Fibroblast Growth Factor/antagonists & inhibitors , Succinate Dehydrogenase/geneticsABSTRACT
Large panels of comprehensively characterized human cancer models, including the Cancer Cell Line Encyclopedia (CCLE), have provided a rigorous framework with which to study genetic variants, candidate targets, and small-molecule and biological therapeutics and to identify new marker-driven cancer dependencies. To improve our understanding of the molecular features that contribute to cancer phenotypes, including drug responses, here we have expanded the characterizations of cancer cell lines to include genetic, RNA splicing, DNA methylation, histone H3 modification, microRNA expression and reverse-phase protein array data for 1,072 cell lines from individuals of various lineages and ethnicities. Integration of these data with functional characterizations such as drug-sensitivity, short hairpin RNA knockdown and CRISPR-Cas9 knockout data reveals potential targets for cancer drugs and associated biomarkers. Together, this dataset and an accompanying public data portal provide a resource for the acceleration of cancer research using model cancer cell lines.
Subject(s)
Cell Line, Tumor , Neoplasms/genetics , Neoplasms/pathology , Antineoplastic Agents/pharmacology , Biomarkers, Tumor , DNA Methylation , Drug Resistance, Neoplasm , Ethnicity/genetics , Gene Editing , Histones/metabolism , Humans , MicroRNAs/genetics , Molecular Targeted Therapy , Neoplasms/metabolism , Protein Array Analysis , RNA SplicingABSTRACT
The zinc-finger transcription factor Helios is critical for maintaining the identity, anergic phenotype and suppressive activity of regulatory T (Treg) cells. While it is an attractive target to enhance the efficacy of currently approved immunotherapies, no existing approaches can directly modulate Helios activity or abundance. Here, we report the structure-guided development of small molecules that recruit the E3 ubiquitin ligase substrate receptor cereblon to Helios, thereby promoting its degradation. Pharmacological Helios degradation destabilized the anergic phenotype and reduced the suppressive activity of Treg cells, establishing a route towards Helios-targeting therapeutics. More generally, this study provides a framework for the development of small-molecule degraders for previously unligandable targets by reprogramming E3 ligase substrate specificity.
Subject(s)
DNA-Binding Proteins/drug effects , Ikaros Transcription Factor/drug effects , T-Lymphocytes, Regulatory/drug effects , Transcription Factors/drug effects , Adaptor Proteins, Signal Transducing/genetics , Animals , Cell Line , DNA-Binding Proteins/genetics , Humans , Ikaros Transcription Factor/genetics , Jurkat Cells , Mice , Models, Molecular , Molecular Structure , Mutation/genetics , Small Molecule Libraries , Substrate Specificity , Transcription Factors/genetics , Ubiquitin-Protein Ligases/metabolismABSTRACT
PURPOSE: PARP inhibitor resistance may be overcome by combinatorial strategies with agents that disrupt homologous recombination repair (HRR). Multiple HRR pathway components are HSP90 clients, so that HSP90 inhibition leads to abrogation of HRR and sensitisation to PARP inhibition. We performed in vivo preclinical studies of the HSP90 inhibitor onalespib with olaparib and conducted a Phase 1 combination study. PATIENTS AND METHODS: Tolerability and efficacy studies were performed in patient-derived xenograft(PDX) models of ovarian cancer. Clinical safety, tolerability, steady-state pharmacokinetics and preliminary efficacy of olaparib and onalespib were evaluated using a standard 3 + 3 dose-escalation design. RESULTS: Olaparib/onalespib exhibited anti-tumour activity against BRCA1-mutated PDX models with acquired PARPi resistance and PDX models with RB-pathway alterations(CDKN2A loss and CCNE1 overexpression). Phase 1 evaluation revealed that dose levels up to olaparib 300 mg/onalespib 40 mg and olaparib 200 mg/onalespib 80 mg were safe without dose-limiting toxicities. Coadministration of olaparib and onalespib did not appear to affect the steady-state pharmacokinetics of either agent. There were no objective responses, but disease stabilisation ≥24 weeks was observed in 7/22 (32%) evaluable patients including patients with BRCA-mutated ovarian cancers and acquired PARPi resistance and patients with tumours harbouring RB-pathway alterations. CONCLUSIONS: Combining onalespib and olaparib was feasible and demonstrated preliminary evidence of anti-tumour activity.
Subject(s)
Antineoplastic Agents , Ovarian Neoplasms , Antineoplastic Agents/therapeutic use , Carcinoma, Ovarian Epithelial , HSP90 Heat-Shock Proteins , Humans , Ovarian Neoplasms/drug therapy , Ovarian Neoplasms/genetics , Ovarian Neoplasms/pathology , Phthalazines/therapeutic use , Poly(ADP-ribose) Polymerase Inhibitors/therapeutic useABSTRACT
The C797S mutation confers resistance to covalent EGFR inhibitors used in the treatment of lung tumors with the activating L858R mutation. Isoindolinones such as JBJ-4-125-02 bind in an allosteric pocket and are active against this mutation, with high selectivity over wild-type EGFR. The most potent examples we developed from that series have a potential chemical instability risk from the combination of the amide and phenol groups. We explored a scaffold hopping approach to identify new series of allosteric EGFR inhibitors that retained good potency in the absence of the phenol group. The 5-F quinazolinone 34 demonstrated tumor regression in an H1975 efficacy model upon once daily oral dosing at 25 mg/kg.
Subject(s)
Carcinoma, Non-Small-Cell Lung , Lung Neoplasms , Carcinoma, Non-Small-Cell Lung/metabolism , Cell Line, Tumor , Drug Resistance, Neoplasm , ErbB Receptors/genetics , ErbB Receptors/metabolism , Humans , Lung Neoplasms/metabolism , Mutation , Phenols , Protein Kinase Inhibitors/pharmacology , Protein Kinase Inhibitors/therapeutic use , Quinazolinones/pharmacology , Quinazolinones/therapeutic useABSTRACT
Merkel cell polyomavirus (MCV) contributes to approximately 80% of all Merkel cell carcinomas (MCCs), a highly aggressive neuroendocrine carcinoma of the skin. MCV-positive MCC expresses small T antigen (ST) and a truncated form of large T antigen (LT) and usually contains wild-type p53 (TP53) and RB (RB1). In contrast, virus-negative MCC contains inactivating mutations in TP53 and RB1. While the MCV-truncated LT can bind and inhibit RB, it does not bind p53. We report here that MCV LT binds to RB, leading to increased levels of ARF, an inhibitor of MDM2, and activation of p53. However, coexpression of ST reduced p53 activation. MCV ST recruits the MYC homologue MYCL (L-Myc) to the EP400 chromatin remodeler complex and transactivates specific target genes. We observed that depletion of EP400 in MCV-positive MCC cell lines led to increased p53 target gene expression. We suspected that the MCV ST-MYCL-EP400 complex could functionally inactivate p53, but the underlying mechanism was not known. Integrated ChIP and RNA-sequencing analysis following EP400 depletion identified MDM2 as well as CK1α, an activator of MDM4, as target genes of the ST-MYCL-EP400 complex. In addition, MCV-positive MCC cells expressed high levels of MDM4. Combining MDM2 inhibitors with lenalidomide targeting CK1α or an MDM4 inhibitor caused synergistic activation of p53, leading to an apoptotic response in MCV-positive MCC cells and MCC-derived xenografts in mice. These results support dual targeting of MDM2 and MDM4 in virus-positive MCC and other p53 wild-type tumors.
Subject(s)
Carcinoma, Merkel Cell/metabolism , Merkel cell polyomavirus/metabolism , Nuclear Proteins/metabolism , Polyomavirus Infections/metabolism , Proto-Oncogene Proteins c-mdm2/metabolism , Proto-Oncogene Proteins/metabolism , Tumor Suppressor Protein p53/metabolism , Tumor Virus Infections/metabolism , Carcinoma, Merkel Cell/genetics , Carcinoma, Merkel Cell/pathology , Carcinoma, Merkel Cell/virology , Cell Cycle Proteins , DNA Helicases/genetics , DNA Helicases/metabolism , DNA-Binding Proteins/genetics , DNA-Binding Proteins/metabolism , Humans , Merkel cell polyomavirus/genetics , Nuclear Proteins/antagonists & inhibitors , Nuclear Proteins/genetics , Polyomavirus Infections/genetics , Polyomavirus Infections/pathology , Proto-Oncogene Proteins/antagonists & inhibitors , Proto-Oncogene Proteins/genetics , Proto-Oncogene Proteins c-mdm2/antagonists & inhibitors , Proto-Oncogene Proteins c-mdm2/genetics , Retinoblastoma Binding Proteins/genetics , Retinoblastoma Binding Proteins/metabolism , Tumor Suppressor Protein p53/genetics , Tumor Virus Infections/genetics , Tumor Virus Infections/pathology , Ubiquitin-Protein Ligases/genetics , Ubiquitin-Protein Ligases/metabolismABSTRACT
BACKGROUND: Malignant pleural mesothelioma (MPM) is a highly aggressive cancer with a dismal prognosis. There is increasing interest in targeting chromatin regulatory pathways in difficult-to-treat cancers. In preliminary studies, we found that KDM4A (lysine-specific histone demethylase 4) was overexpressed in MPM. METHODS: KDM4A protein expression was determined by immunohistochemistry or immunoblotting. Functional inhibition of KDM4A by targeted knockdown and small molecule drugs was correlated to cell growth using cell lines and a xenograft mouse model. Gene expression profiling was performed to identify KDM4A-dependent signature pathways. RESULTS: Levels of KDM4A were found to be significantly elevated in MPM patients compared to normal mesothelial tissue. Inhibiting the enzyme activity efficiently reduced cell growth in vitro and reduced tumour growth in vivo. KDM4A inhibitor-induced apoptosis was further enhanced by the BH3 mimetic navitoclax. KDM4A expression was associated with pathways involved in cell growth and DNA repair. Interestingly, inhibitors of the DNA damage and replication checkpoint regulators CHK1 (prexasertib) and WEE1 (adavosertib) within the DNA double-strand break repair pathway, cooperated in the inhibition of cell growth. CONCLUSIONS: The results establish a novel and essential role for KDM4A in growth in preclinical models of MPM and identify potential therapeutic approaches to target KDM4A-dependent vulnerabilities.
Subject(s)
Antineoplastic Combined Chemotherapy Protocols/administration & dosage , Jumonji Domain-Containing Histone Demethylases/genetics , Jumonji Domain-Containing Histone Demethylases/metabolism , Mesothelioma, Malignant/pathology , Up-Regulation , Aniline Compounds/administration & dosage , Aniline Compounds/pharmacology , Animals , Antineoplastic Combined Chemotherapy Protocols/pharmacology , Cell Line, Tumor , Female , Gene Expression Regulation, Neoplastic/drug effects , Gene Knockdown Techniques , Humans , Mesothelioma, Malignant/drug therapy , Mesothelioma, Malignant/genetics , Mesothelioma, Malignant/metabolism , Mice , Pyrazines/administration & dosage , Pyrazines/pharmacology , Pyrazoles/administration & dosage , Pyrazoles/pharmacology , Pyrimidinones/administration & dosage , Pyrimidinones/pharmacology , Sulfonamides/administration & dosage , Sulfonamides/pharmacology , Up-Regulation/drug effects , Xenograft Model Antitumor AssaysABSTRACT
Mutations in the E3 ubiquitin ligase CBL, found in several myeloid neoplasms, lead to decreased ubiquitin ligase activity. In murine systems, these mutations are associated with cytokine-independent proliferation, thought to result from the activation of hematopoietic growth receptors, including FLT3 and KIT. Using cell lines and primary patient cells, we compared the activity of a panel of FLT3 inhibitors currently being used or tested in AML patients and also evaluated the effects of inhibition of the non-receptor tyrosine kinase, SYK. We show that FLT3 inhibitors ranging from promiscuous to highly targeted are potent inhibitors of growth of leukaemia cells expressing mutant CBL in vitro, and we demonstrate in vivo efficacy of midostaurin using mouse models of mutant CBL. Potentiation of effects of targeted FLT3 inhibition by SYK inhibition has been demonstrated in models of mutant FLT3-positive AML and AML characterized by hyperactivated SYK. Here, we show that targeted SYK inhibition similarly enhances the effects of midostaurin and other FLT3 inhibitors against mutant CBL-positive leukaemia. Taken together, our results support the notion that mutant CBL-expressing myeloid leukaemias are highly sensitive to available FLT3 inhibitors and that this effect can be significantly augmented by optimum inhibition of SYK kinase.
Subject(s)
Leukemia, Myeloid/genetics , Mutation/genetics , Proto-Oncogene Proteins c-cbl/genetics , Syk Kinase/genetics , fms-Like Tyrosine Kinase 3/genetics , Animals , Cell Line, Tumor , Humans , Leukemia, Myeloid/drug therapy , Mice , Mutation/drug effects , Signal Transduction/drug effects , Signal Transduction/genetics , Staurosporine/analogs & derivatives , Staurosporine/pharmacologyABSTRACT
Recently, several targeted agents have been developed for specific subsets of patients with acute myeloid leukaemia (AML), including midostaurin, the first FDA-approved FLT3 inhibitor for newly diagnosed patients with FLT3 mutations. However, in the initial Phase I/II clinical trials, some patients without FLT3 mutations had transient responses to midostaurin, suggesting that this multi-targeted kinase inhibitor might benefit AML patients more broadly. Here, we demonstrate submicromolar efficacy of midostaurin in vitro and efficacy in vivo against wild-type (wt) FLT3-expressing AML cell lines and primary cells, and we compare its effectiveness with that of other FLT3 inhibitors currently in clinical trials. Midostaurin was found to synergize with standard chemotherapeutic drugs and some targeted agents against AML cells without mutations in FLT3. The mechanism may involve, in part, the unique kinase profile of midostaurin that includes proteins implicated in AML transformation, such as SYK or KIT, or inhibition of ERK pathway or proviability signalling. Our findings support further investigation of midostaurin as a chemosensitizing agent in AML patients without FLT3 mutations.
Subject(s)
Leukemia, Myeloid, Acute/drug therapy , Protein Kinase Inhibitors/pharmacology , Staurosporine/analogs & derivatives , fms-Like Tyrosine Kinase 3/genetics , Aniline Compounds/pharmacology , Animals , Antineoplastic Agents/pharmacology , Apoptosis/drug effects , Benzimidazoles/pharmacology , Benzothiazoles/pharmacology , Cell Line, Tumor , Cell Proliferation/drug effects , Drug Synergism , Gene Expression Regulation, Neoplastic/drug effects , Humans , Leukemia, Myeloid, Acute/genetics , Leukemia, Myeloid, Acute/pathology , Mice , Mutation/drug effects , Phenylurea Compounds/pharmacology , Piperidines/pharmacology , Pyrazines/pharmacology , Sorafenib/pharmacology , Staurosporine/pharmacology , Syk Kinase/genetics , fms-Like Tyrosine Kinase 3/antagonists & inhibitorsABSTRACT
Mutations in two type-3 receptor tyrosine kinases (RTKs), KIT and FLT3, are common in both acute myeloid leukaemia (AML) and systemic mastocytosis (SM) and lead to hyperactivation of key signalling pathways. A large number of tyrosine kinase inhibitors (TKIs) have been developed that target either FLT3 or KIT and significant clinical benefit has been demonstrated in multiple clinical trials. Given the structural similarity of FLT3 and KIT, it is not surprising that some of these TKIs inhibit both of these receptors. This is typified by midostaurin, which has been approved by the US Food and Drug Administration for mutant FLT3-positive AML and for KIT D816V-positive SM. Here, we compare the in vitro activities of the clinically available FLT3 and KIT inhibitors with those of midostaurin against a panel of cells expressing a variety of oncogenic FLT3 or KIT receptors, including wild-type (wt) FLT3, FLT3-internal tandem duplication (ITD), FLT3 D835Y, the resistance mutant FLT3-ITD+ F691L, KIT D816V, and KIT N822K. We also examined the effects of these inhibitors in vitro and in vivo on cells expressing mutations in c-CBL found in AML that result in hypersensitization of RTKs, such as FLT3 and KIT. The results show a wide spectrum of activity of these various mutations to these clinically available TKIs.
Subject(s)
Antineoplastic Agents/pharmacology , Hematologic Neoplasms/drug therapy , Mutant Proteins/drug effects , Protein Kinase Inhibitors/pharmacology , Aniline Compounds/pharmacology , Aniline Compounds/therapeutic use , Antineoplastic Agents/therapeutic use , Benzimidazoles/pharmacology , Benzimidazoles/therapeutic use , Benzothiazoles/pharmacology , Benzothiazoles/therapeutic use , Cell Line, Tumor , Drug Screening Assays, Antitumor , Hematologic Neoplasms/genetics , Humans , Phenylurea Compounds/pharmacology , Phenylurea Compounds/therapeutic use , Piperidines/pharmacology , Piperidines/therapeutic use , Protein Kinase Inhibitors/therapeutic use , Proto-Oncogene Proteins c-cbl/drug effects , Proto-Oncogene Proteins c-cbl/genetics , Proto-Oncogene Proteins c-kit/drug effects , Proto-Oncogene Proteins c-kit/genetics , Pyrazines/pharmacology , Pyrazines/therapeutic use , Pyrazoles/pharmacology , Pyrazoles/therapeutic use , Pyrroles/pharmacology , Pyrroles/therapeutic use , Sorafenib/pharmacology , Sorafenib/therapeutic use , Staurosporine/analogs & derivatives , Staurosporine/pharmacology , Staurosporine/therapeutic use , Triazines/pharmacology , Triazines/therapeutic use , fms-Like Tyrosine Kinase 3/drug effects , fms-Like Tyrosine Kinase 3/geneticsABSTRACT
Oncogenic forms of the kinase FLT3 are important therapeutic targets in acute myeloid leukemia (AML); however, clinical responses to small-molecule kinase inhibitors are short-lived as a result of the rapid emergence of resistance due to point mutations or compensatory increases in FLT3 expression. We sought to develop a complementary pharmacological approach whereby proteasome-mediated FLT3 degradation could be promoted by inhibitors of the deubiquitinating enzymes (DUBs) responsible for cleaving ubiquitin from FLT3. Because the relevant DUBs for FLT3 are not known, we assembled a focused library of most reported small-molecule DUB inhibitors and carried out a cellular phenotypic screen to identify compounds that could induce the degradation of oncogenic FLT3. Subsequent target deconvolution efforts allowed us to identify USP10 as the critical DUB required to stabilize FLT3. Targeting of USP10 showed efficacy in preclinical models of mutant-FLT3 AML, including cell lines, primary patient specimens and mouse models of oncogenic-FLT3-driven leukemia.
Subject(s)
Antineoplastic Agents/pharmacology , Leukemia, Myeloid, Acute/drug therapy , Protein Kinase Inhibitors/pharmacology , Small Molecule Libraries/pharmacology , Thiophenes/pharmacology , Ubiquitin Thiolesterase/antagonists & inhibitors , fms-Like Tyrosine Kinase 3/metabolism , Animals , Antineoplastic Agents/chemistry , Cell Proliferation/drug effects , Cell Survival/drug effects , Dose-Response Relationship, Drug , Drug Screening Assays, Antitumor , Female , Humans , Leukemia, Myeloid, Acute/metabolism , Leukemia, Myeloid, Acute/pathology , Mice , Mice, Inbred NOD , Molecular Structure , Mutation , Neoplasms, Experimental/drug therapy , Neoplasms, Experimental/metabolism , Neoplasms, Experimental/pathology , Protein Kinase Inhibitors/chemistry , Small Molecule Libraries/chemistry , Structure-Activity Relationship , Thiophenes/chemistry , Tumor Cells, Cultured , Ubiquitin/metabolism , Ubiquitin Thiolesterase/genetics , Ubiquitin Thiolesterase/metabolism , fms-Like Tyrosine Kinase 3/geneticsABSTRACT
INTRODUCTION: ERBB2 amplification in lung cancer remains poorly characterized. HER2 (encoded by ERBB2) is a transmembrane tyrosine kinase capable of ligand-independent dimerization and signaling when overexpressed, and a common cause of HER2 overexpression is ERBB2 amplification. Here, we evaluated the clinicopathologic and genomic characteristics of ERBB2-amplified NSCLC and explored a HER2 antibody-drug conjugate (ADC) therapeutic strategy. METHODS: Our institutional next-generation DNA sequencing data (OncoPanel) from 5769 NSCLC samples (5075 patients) were queried for cases having high-level ERBB2 amplification (≥6 copies). Clinical and demographic characteristics were extracted from the electronic medical records. Efficacy of the pan-ERBB inhibitor afatinib or HER2 ADCs (trastuzumab deruxtecan and trastuzumab emtansine) was evaluated in NSCLC preclinical models and patients with ERBB2 amplification. RESULTS: High-level ERBB2 amplification was identified in 0.9% of lung adenocarcinomas and reliably predicted overexpression of HER2. ERBB2 amplification events are detected in two distinct clinicopathologic and genomic subsets of NSCLC: as the sole mitogenic driver in tumors arising in patients with a smoking history or as a concomitant alteration with other mitogenic drivers in patients with a light or never smoking history. We further reveal that trastuzumab deruxtecan is effective therapy in in vitro and in vivo preclinical models of NSCLC harboring ERBB2 amplification and report two cases of clinical activity of an anti-HER2 ADC in patients who acquired ERBB2 amplification after previous targeted therapy. CONCLUSIONS: High-level ERBB2 amplification reliably predicts HER2 overexpression in patients with NSCLC, and HER2 ADC is effective therapy in this population.
Subject(s)
Camptothecin/analogs & derivatives , Carcinoma, Non-Small-Cell Lung , Gene Amplification , Lung Neoplasms , Receptor, ErbB-2 , Humans , Lung Neoplasms/drug therapy , Lung Neoplasms/genetics , Lung Neoplasms/pathology , Receptor, ErbB-2/metabolism , Receptor, ErbB-2/genetics , Carcinoma, Non-Small-Cell Lung/genetics , Carcinoma, Non-Small-Cell Lung/drug therapy , Carcinoma, Non-Small-Cell Lung/pathology , Female , Male , Middle Aged , Animals , Immunoconjugates/therapeutic use , Immunoconjugates/pharmacology , Aged , Mice , Trastuzumab/therapeutic use , Trastuzumab/pharmacology , Prevalence , Afatinib/therapeutic use , Afatinib/pharmacology , Ado-Trastuzumab Emtansine/therapeutic use , Ado-Trastuzumab Emtansine/pharmacologyABSTRACT
Brown and brown-like adipose tissues have attracted significant attention for their role in metabolism and therapeutic potential in diabetes and obesity. Despite compelling evidence of an interplay between adipocytes and lymphocytes, the involvement of these tissues in immune responses remains largely unexplored. This study explicates a newfound connection between neuroinflammation and brown- and bone marrow adipose tissue. Leveraging the use of [18F]F-AraG, a mitochondrial metabolic tracer capable of tracking activated lymphocytes and adipocytes simultaneously, we demonstrate, in models of glioblastoma and multiple sclerosis, the correlation between intracerebral immune infiltration and changes in brown- and bone marrow adipose tissue. Significantly, we show initial evidence that a neuroinflammation-adipose tissue link may also exist in humans. This study proposes the concept of an intricate immuno-neuro-adipose circuit, and highlights brown- and bone marrow adipose tissue as an intermediary in the communication between the immune and nervous systems. Understanding the interconnectedness within this circuitry may lead to advancements in the treatment and management of various conditions, including cancer, neurodegenerative diseases and metabolic disorders.
Subject(s)
Adipose Tissue, Brown , Neuroinflammatory Diseases , Animals , Humans , Adipose Tissue, Brown/metabolism , Neuroinflammatory Diseases/immunology , Neuroinflammatory Diseases/metabolism , Neuroinflammatory Diseases/pathology , Bone Marrow/metabolism , Mice , Male , Glioblastoma/pathology , Glioblastoma/immunology , Glioblastoma/metabolism , Mice, Inbred C57BL , Female , Multiple Sclerosis/pathology , Multiple Sclerosis/immunology , Multiple Sclerosis/metabolism , Multiple Sclerosis/diagnostic imaging , Positron-Emission TomographyABSTRACT
A substantial fraction of cancers evade immune detection by silencing Stimulator of Interferon Genes (STING)-Interferon (IFN) signaling. Therapeutic reactivation of this program via STING agonists, epigenetic, or DNA-damaging therapies can restore antitumor immunity in multiple preclinical models. Here we show that adaptive induction of three prime exonuclease 1 (TREX1) restrains STING-dependent nucleic acid sensing in cancer cells via its catalytic function in degrading cytosolic DNA. Cancer cell TREX1 expression is coordinately induced with STING by autocrine IFN and downstream STAT1, preventing signal amplification. TREX1 inactivation in cancer cells thus unleashes STING-IFN signaling, recruiting T and natural killer (NK) cells, sensitizing to NK cell-derived IFNγ, and cooperating with programmed cell death protein 1 blockade in multiple mouse tumor models to enhance immunogenicity. Targeting TREX1 may represent a complementary strategy to induce cytosolic DNA and amplify cancer cell STING-IFN signaling as a means to sensitize tumors to immune checkpoint blockade (ICB) and/or cell therapies. SIGNIFICANCE: STING-IFN signaling in cancer cells promotes tumor cell immunogenicity. Inactivation of the DNA exonuclease TREX1, which is adaptively upregulated to limit pathway activation in cancer cells, recruits immune effector cells and primes NK cell-mediated killing. Targeting TREX1 has substantial therapeutic potential to amplify cancer cell immunogenicity and overcome ICB resistance. This article is featured in Selected Articles from This Issue, p. 695.
Subject(s)
Exodeoxyribonucleases , Membrane Proteins , Phosphoproteins , Signal Transduction , Exodeoxyribonucleases/genetics , Mice , Phosphoproteins/metabolism , Phosphoproteins/genetics , Humans , Animals , Membrane Proteins/genetics , Membrane Proteins/metabolism , Neoplasms/immunology , Neoplasms/genetics , Neoplasms/drug therapy , Interferons/metabolism , Cell Line, Tumor , Killer Cells, Natural/immunology , Killer Cells, Natural/metabolismABSTRACT
Epithelial ovarian cancer (EOC) remains one of the most lethal gynecological cancers. Cytokine-induced memory-like (CIML) natural killer (NK) cells have shown promising results in preclinical and early-phase clinical trials. In the current study, CIML NK cells demonstrated superior antitumor responses against a panel of EOC cell lines, increased expression of activation receptors, and up-regulation of genes involved in cell cycle/proliferation and down-regulation of inhibitory/suppressive genes. CIML NK cells transduced with a chimeric antigen receptor (CAR) targeting the membrane-proximal domain of mesothelin (MSLN) further improved the antitumor responses against MSLN-expressing EOC cells and patient-derived xenograft tumor cells. CAR arming of the CIML NK cells subtanstially reduced their dysfunction in patient-derived ascites fluid with transcriptomic changes related to altered metabolism and tonic signaling as potential mechanisms. Lastly, the adoptive transfer of MSLN-CAR CIML NK cells demonstrated remarkable inhibition of tumor growth and prevented metastatic spread in xenograft mice, supporting their potential as an effective therapeutic strategy in EOC.
Subject(s)
Killer Cells, Natural , Mesothelin , Ovarian Neoplasms , Receptors, Chimeric Antigen , Xenograft Model Antitumor Assays , Humans , Animals , Killer Cells, Natural/immunology , Killer Cells, Natural/metabolism , Female , Mice , Ovarian Neoplasms/metabolism , Ovarian Neoplasms/pathology , Ovarian Neoplasms/immunology , Ovarian Neoplasms/therapy , Cell Line, Tumor , Receptors, Chimeric Antigen/metabolism , Receptors, Chimeric Antigen/immunology , Receptors, Chimeric Antigen/genetics , GPI-Linked Proteins/metabolism , GPI-Linked Proteins/genetics , Immunotherapy, Adoptive/methods , Carcinoma, Ovarian Epithelial/metabolism , Carcinoma, Ovarian Epithelial/pathology , Carcinoma, Ovarian Epithelial/immunology , Carcinoma, Ovarian Epithelial/therapy , Immunologic Memory , Protein DomainsABSTRACT
Wilms tumor (WT) is the most common renal malignancy of childhood. Despite improvements in the overall survival, relapse occurs in ~15% of patients with favorable histology WT (FHWT). Half of these patients will succumb to their disease. Identifying novel targeted therapies remains challenging in part due to the lack of faithful preclinical in vitro models. Here we establish twelve patient-derived WT cell lines and demonstrate that these models faithfully recapitulate WT biology using genomic and transcriptomic techniques. We then perform loss-of-function screens to identify the nuclear export gene, XPO1, as a vulnerability. We find that the FDA approved XPO1 inhibitor, KPT-330, suppresses TRIP13 expression, which is required for survival. We further identify synergy between KPT-330 and doxorubicin, a chemotherapy used in high-risk FHWT. Taken together, we identify XPO1 inhibition with KPT-330 as a potential therapeutic option to treat FHWTs and in combination with doxorubicin, leads to durable remissions in vivo.
Subject(s)
Hydrazines , Kidney Neoplasms , Triazoles , Wilms Tumor , Humans , Exportin 1 Protein , Active Transport, Cell Nucleus , Karyopherins/genetics , Karyopherins/metabolism , Receptors, Cytoplasmic and Nuclear/genetics , Receptors, Cytoplasmic and Nuclear/metabolism , Cell Line, Tumor , Apoptosis , Neoplasm Recurrence, Local , Doxorubicin/pharmacology , Wilms Tumor/drug therapy , Wilms Tumor/genetics , Kidney Neoplasms/drug therapy , Kidney Neoplasms/genetics , ATPases Associated with Diverse Cellular Activities/metabolism , Cell Cycle Proteins/metabolismABSTRACT
Despite the success of KRAS G12C inhibitors in non-small cell lung cancer (NSCLC), more effective treatments are needed. One preclinical strategy has been to cotarget RAS and mTOR pathways; however, toxicity due to broad mTOR inhibition has limited its utility. Therefore, we sought to develop a more refined means of targeting cap-dependent translation and identifying the most therapeutically important eukaryotic initiation factor 4F complex-translated (eIF4F-translated) targets. Here, we show that an eIF4A inhibitor, which targets a component of eIF4F, dramatically enhances the effects of KRAS G12C inhibitors in NSCLCs and together these agents induce potent tumor regression in vivo. By screening a broad panel of eIF4F targets, we show that this cooperativity is driven by effects on BCL-2 family proteins. Moreover, because multiple BCL-2 family members are concomitantly suppressed, these agents are broadly efficacious in NSCLCs, irrespective of their dependency on MCL1, BCL-xL, or BCL-2, which is known to be heterogeneous. Finally, we show that MYC overexpression confers sensitivity to this combination because it creates a dependency on eIF4A for BCL-2 family protein expression. Together, these studies identify a promising therapeutic strategy for KRAS-mutant NSCLCs, demonstrate that BCL-2 proteins are the key mediators of the therapeutic response in this tumor type, and uncover a predictive biomarker of sensitivity.
Subject(s)
Carcinoma, Non-Small-Cell Lung , Lung Neoplasms , Humans , Lung Neoplasms/drug therapy , Lung Neoplasms/genetics , Lung Neoplasms/metabolism , Carcinoma, Non-Small-Cell Lung/drug therapy , Carcinoma, Non-Small-Cell Lung/genetics , Carcinoma, Non-Small-Cell Lung/metabolism , Eukaryotic Initiation Factor-4F/metabolism , Proto-Oncogene Proteins p21(ras)/genetics , Proto-Oncogene Proteins p21(ras)/metabolism , Protein Kinase Inhibitors/pharmacology , Cell Line, Tumor , TOR Serine-Threonine Kinases/metabolism , Proto-Oncogene Proteins c-bcl-2 , MutationABSTRACT
Merkel Cell Carcinoma (MCC) is a highly aggressive neuroendocrine cutaneous malignancy arising from either ultraviolet-induced mutagenesis or Merkel cell polyomavirus (MCPyV) integration. It is the only known neuroendocrine tumor (NET) with a virus etiology. Despite extensive research, our understanding of the molecular mechanisms driving the transition from normal cells to MCC remains limited. To address this knowledge gap, we assessed the impact of inducible MCPyV T antigens into normal human fibroblasts by performing RNA sequencing. Our findings suggested that the WNT signaling pathway plays a critical role in the development of MCC. To test this model, we bioinformatically evaluated various perturbagens for their ability to reverse the MCC gene expression signature and identified pyrvinium pamoate, an FDA-approved anthelminthic drug known for its anti-tumor potential in multiple cancers. Leveraging transcriptomic, network, and molecular analyses, we found that pyrvinium effectively targets multiple MCC vulnerabilities. Specifically, pyrvinium not only reverses the neuroendocrine features of MCC by modulating canonical and non-canonical WNT signaling pathways but also inhibits cancer cell growth by activating the p53-mediated apoptosis pathway, disrupting mitochondrial function, and inducing endoplasmic reticulum (ER) stress. Pyrvinium also effectively inhibits tumor growth in an MCC mouse xenograft model. These findings offer new avenues for the development of therapeutic strategies for neuroendocrine cancer and highlight the utility of pyrvinium as a potential treatment for MCC.