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1.
Annu Rev Immunol ; 42(1): 521-550, 2024 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-38382538

RESUMO

Immune checkpoint blockade (ICB) induces a remarkable and durable response in a subset of cancer patients. However, most patients exhibit either primary or acquired resistance to ICB. This resistance arises from a complex interplay of diverse dynamic mechanisms within the tumor microenvironment (TME). These mechanisms include genetic, epigenetic, and metabolic alterations that prevent T cell trafficking to the tumor site, induce immune cell dysfunction, interfere with antigen presentation, drive heightened expression of coinhibitory molecules, and promote tumor survival after immune attack. The TME worsens ICB resistance through the formation of immunosuppressive networks via immune inhibition, regulatory metabolites, and abnormal resource consumption. Finally, patient lifestyle factors, including obesity and microbiome composition, influence ICB resistance. Understanding the heterogeneity of cellular, molecular, and environmental factors contributing to ICB resistance is crucial to develop targeted therapeutic interventions that enhance the clinical response. This comprehensive overview highlights key mechanisms of ICB resistance that may be clinically translatable.


Assuntos
Resistencia a Medicamentos Antineoplásicos , Inibidores de Checkpoint Imunológico , Imunoterapia , Neoplasias , Microambiente Tumoral , Humanos , Microambiente Tumoral/imunologia , Neoplasias/imunologia , Neoplasias/terapia , Neoplasias/metabolismo , Neoplasias/etiologia , Resistencia a Medicamentos Antineoplásicos/imunologia , Animais , Imunoterapia/métodos , Inibidores de Checkpoint Imunológico/uso terapêutico , Inibidores de Checkpoint Imunológico/farmacologia , Epigênese Genética
2.
Annu Rev Immunol ; 40: 45-74, 2022 04 26.
Artigo em Inglês | MEDLINE | ID: mdl-35471840

RESUMO

The transformative success of antibodies targeting the PD-1 (programmed death 1)/B7-H1 (B7 homolog 1) pathway (anti-PD therapy) has revolutionized cancer treatment. However, only a fraction of patients with solid tumors and some hematopoietic malignancies respond to anti-PD therapy, and the reason for failure in other patients is less known. By dissecting the mechanisms underlying this resistance, current studies reveal that the tumor microenvironment is a major location for resistance to occur. Furthermore, the resistance mechanisms appear to be highly heterogeneous. Here, we discuss recent human cancer data identifying mechanisms of resistance to anti-PD therapy. We review evidence for immune-based resistance mechanisms such as loss of neoantigens, defects in antigen presentation and interferon signaling, immune inhibitory molecules, and exclusion of T cells. We also review the clinical evidence for emerging mechanisms of resistance to anti-PD therapy, such as alterations in metabolism, microbiota, and epigenetics. Finally, we discuss strategies to overcome anti-PD therapy resistance and emphasize the need to develop additional immunotherapies based on the concept of normalization cancer immunotherapy.


Assuntos
Neoplasias , Receptor de Morte Celular Programada 1 , Animais , Antígeno B7-H1 , Humanos , Imunoterapia , Neoplasias/tratamento farmacológico , Neoplasias/metabolismo , Linfócitos T , Microambiente Tumoral
3.
Annu Rev Immunol ; 39: 395-416, 2021 04 26.
Artigo em Inglês | MEDLINE | ID: mdl-33902315

RESUMO

Recent evidence supports the notion that mitochondrial metabolism is necessary for T cell activation, proliferation, and function. Mitochondrial metabolism supports T cell anabolism by providing key metabolites for macromolecule synthesis and generating metabolites for T cell function. In this review, we focus on how mitochondrial metabolism controls conventional and regulatory T cell fates and function.


Assuntos
Imunidade Celular , Mitocôndrias , Animais , Humanos
4.
Cell ; 2024 Oct 14.
Artigo em Inglês | MEDLINE | ID: mdl-39419025

RESUMO

Chemotherapy is often combined with immune checkpoint inhibitor (ICIs) to enhance immunotherapy responses. Despite the approval of chemo-immunotherapy in multiple human cancers, many immunologically cold tumors remain unresponsive. The mechanisms determining the immunogenicity of chemotherapy are elusive. Here, we identify the ER stress sensor IRE1α as a critical checkpoint that restricts the immunostimulatory effects of taxane chemotherapy and prevents the innate immune recognition of immunologically cold triple-negative breast cancer (TNBC). IRE1α RNase silences taxane-induced double-stranded RNA (dsRNA) through regulated IRE1-dependent decay (RIDD) to prevent NLRP3 inflammasome-dependent pyroptosis. Inhibition of IRE1α in Trp53-/- TNBC allows taxane to induce extensive dsRNAs that are sensed by ZBP1, which in turn activates NLRP3-GSDMD-mediated pyroptosis. Consequently, IRE1α RNase inhibitor plus taxane converts PD-L1-negative, ICI-unresponsive TNBC tumors into PD-L1high immunogenic tumors that are hyper-sensitive to ICI. We reveal IRE1α as a cancer cell defense mechanism that prevents taxane-induced danger signal accumulation and pyroptotic cell death.

5.
Cell ; 187(20): 5753-5774.e28, 2024 Oct 03.
Artigo em Inglês | MEDLINE | ID: mdl-39265576

RESUMO

The development of successful therapeutics for dementias requires an understanding of their shared and distinct molecular features in the human brain. We performed single-nuclear RNA-seq and ATAC-seq in Alzheimer's disease (AD), frontotemporal dementia (FTD), and progressive supranuclear palsy (PSP), analyzing 41 participants and ∼1 million cells (RNA + ATAC) from three brain regions varying in vulnerability and pathological burden. We identify 32 shared, disease-associated cell types and 14 that are disease specific. Disease-specific cell states represent glial-immune mechanisms and selective neuronal vulnerability impacting layer 5 intratelencephalic neurons in AD, layer 2/3 intratelencephalic neurons in FTD, and layer 5/6 near-projection neurons in PSP. We identify disease-associated gene regulatory networks and cells impacted by causal genetic risk, which differ by disorder. These data illustrate the heterogeneous spectrum of glial and neuronal compositional and gene expression alterations in different dementias and identify therapeutic targets by revealing shared and disease-specific cell states.


Assuntos
Doença de Alzheimer , Demência Frontotemporal , Redes Reguladoras de Genes , Genômica , Neurônios , Análise de Célula Única , Paralisia Supranuclear Progressiva , Humanos , Doença de Alzheimer/genética , Doença de Alzheimer/patologia , Doença de Alzheimer/metabolismo , Demência Frontotemporal/genética , Demência Frontotemporal/patologia , Demência Frontotemporal/metabolismo , Paralisia Supranuclear Progressiva/genética , Paralisia Supranuclear Progressiva/metabolismo , Paralisia Supranuclear Progressiva/patologia , Genômica/métodos , Neurônios/metabolismo , Neurônios/patologia , Idoso , Masculino , Feminino , Encéfalo/metabolismo , Encéfalo/patologia , Demência/genética , Demência/patologia , Demência/metabolismo , Neuroglia/metabolismo , Neuroglia/patologia , Idoso de 80 Anos ou mais , Pessoa de Meia-Idade , RNA-Seq
6.
Cell ; 187(11): 2817-2837.e31, 2024 05 23.
Artigo em Inglês | MEDLINE | ID: mdl-38701783

RESUMO

FMS-related tyrosine kinase 3 ligand (FLT3L), encoded by FLT3LG, is a hematopoietic factor essential for the development of natural killer (NK) cells, B cells, and dendritic cells (DCs) in mice. We describe three humans homozygous for a loss-of-function FLT3LG variant with a history of various recurrent infections, including severe cutaneous warts. The patients' bone marrow (BM) was hypoplastic, with low levels of hematopoietic progenitors, particularly myeloid and B cell precursors. Counts of B cells, monocytes, and DCs were low in the patients' blood, whereas the other blood subsets, including NK cells, were affected only moderately, if at all. The patients had normal counts of Langerhans cells (LCs) and dermal macrophages in the skin but lacked dermal DCs. Thus, FLT3L is required for B cell and DC development in mice and humans. However, unlike its murine counterpart, human FLT3L is required for the development of monocytes but not NK cells.


Assuntos
Células Matadoras Naturais , Proteínas de Membrana , Animais , Feminino , Humanos , Masculino , Camundongos , Linfócitos B/metabolismo , Linfócitos B/citologia , Medula Óssea/metabolismo , Linhagem da Célula , Células Dendríticas/metabolismo , Hematopoese , Células-Tronco Hematopoéticas/metabolismo , Células-Tronco Hematopoéticas/citologia , Células Matadoras Naturais/metabolismo , Células Matadoras Naturais/imunologia , Células de Langerhans/metabolismo , Proteínas de Membrana/metabolismo , Proteínas de Membrana/genética , Monócitos/metabolismo , Pele/metabolismo , Camundongos Endogâmicos C57BL
7.
Cell ; 187(13): 3373-3389.e16, 2024 Jun 20.
Artigo em Inglês | MEDLINE | ID: mdl-38906102

RESUMO

The gut microbiota influences the clinical responses of cancer patients to immunecheckpoint inhibitors (ICIs). However, there is no consensus definition of detrimental dysbiosis. Based on metagenomics (MG) sequencing of 245 non-small cell lung cancer (NSCLC) patient feces, we constructed species-level co-abundance networks that were clustered into species-interacting groups (SIGs) correlating with overall survival. Thirty-seven and forty-five MG species (MGSs) were associated with resistance (SIG1) and response (SIG2) to ICIs, respectively. When combined with the quantification of Akkermansia species, this procedure allowed a person-based calculation of a topological score (TOPOSCORE) that was validated in an additional 254 NSCLC patients and in 216 genitourinary cancer patients. Finally, this TOPOSCORE was translated into a 21-bacterial probe set-based qPCR scoring that was validated in a prospective cohort of NSCLC patients as well as in colorectal and melanoma patients. This approach could represent a dynamic diagnosis tool for intestinal dysbiosis to guide personalized microbiota-centered interventions.


Assuntos
Carcinoma Pulmonar de Células não Pequenas , Microbioma Gastrointestinal , Imunoterapia , Neoplasias Pulmonares , Neoplasias , Feminino , Humanos , Masculino , Akkermansia , Carcinoma Pulmonar de Células não Pequenas/microbiologia , Carcinoma Pulmonar de Células não Pequenas/tratamento farmacológico , Carcinoma Pulmonar de Células não Pequenas/imunologia , Disbiose/microbiologia , Fezes/microbiologia , Microbioma Gastrointestinal/efeitos dos fármacos , Inibidores de Checkpoint Imunológico/uso terapêutico , Inibidores de Checkpoint Imunológico/farmacologia , Imunoterapia/métodos , Neoplasias Pulmonares/microbiologia , Neoplasias Pulmonares/tratamento farmacológico , Metagenômica/métodos , Neoplasias/microbiologia , Resultado do Tratamento
8.
Cell ; 187(4): 861-881.e32, 2024 Feb 15.
Artigo em Inglês | MEDLINE | ID: mdl-38301646

RESUMO

Genomic instability can trigger cancer-intrinsic innate immune responses that promote tumor rejection. However, cancer cells often evade these responses by overexpressing immune checkpoint regulators, such as PD-L1. Here, we identify the SNF2-family DNA translocase SMARCAL1 as a factor that favors tumor immune evasion by a dual mechanism involving both the suppression of innate immune signaling and the induction of PD-L1-mediated immune checkpoint responses. Mechanistically, SMARCAL1 limits endogenous DNA damage, thereby suppressing cGAS-STING-dependent signaling during cancer cell growth. Simultaneously, it cooperates with the AP-1 family member JUN to maintain chromatin accessibility at a PD-L1 transcriptional regulatory element, thereby promoting PD-L1 expression in cancer cells. SMARCAL1 loss hinders the ability of tumor cells to induce PD-L1 in response to genomic instability, enhances anti-tumor immune responses and sensitizes tumors to immune checkpoint blockade in a mouse melanoma model. Collectively, these studies uncover SMARCAL1 as a promising target for cancer immunotherapy.


Assuntos
Antígeno B7-H1 , DNA Helicases , Imunidade Inata , Melanoma , Evasão Tumoral , Animais , Camundongos , Antígeno B7-H1/metabolismo , Instabilidade Genômica , Melanoma/imunologia , Melanoma/metabolismo , DNA Helicases/metabolismo
9.
Cell ; 187(9): 2250-2268.e31, 2024 Apr 25.
Artigo em Inglês | MEDLINE | ID: mdl-38554706

RESUMO

Ubiquitin-dependent unfolding of the CMG helicase by VCP/p97 is required to terminate DNA replication. Other replisome components are not processed in the same fashion, suggesting that additional mechanisms underlie replication protein turnover. Here, we identify replisome factor interactions with a protein complex composed of AAA+ ATPases SPATA5-SPATA5L1 together with heterodimeric partners C1orf109-CINP (55LCC). An integrative structural biology approach revealed a molecular architecture of SPATA5-SPATA5L1 N-terminal domains interacting with C1orf109-CINP to form a funnel-like structure above a cylindrically shaped ATPase motor. Deficiency in the 55LCC complex elicited ubiquitin-independent proteotoxicity, replication stress, and severe chromosome instability. 55LCC showed ATPase activity that was specifically enhanced by replication fork DNA and was coupled to cysteine protease-dependent cleavage of replisome substrates in response to replication fork damage. These findings define 55LCC-mediated proteostasis as critical for replication fork progression and genome stability and provide a rationale for pathogenic variants seen in associated human neurodevelopmental disorders.


Assuntos
Adenosina Trifosfatases , Replicação do DNA , Instabilidade Genômica , Proteostase , Humanos , Adenosina Trifosfatases/metabolismo , Proteína com Valosina/metabolismo , Proteína com Valosina/genética , Células HEK293 , Proteínas de Ciclo Celular/metabolismo , ATPases Associadas a Diversas Atividades Celulares/metabolismo , ATPases Associadas a Diversas Atividades Celulares/genética
10.
Annu Rev Immunol ; 34: 539-73, 2016 05 20.
Artigo em Inglês | MEDLINE | ID: mdl-26927206

RESUMO

The immune system is capable of recognizing tumors and eliminates many early malignant cells. However, tumors evolve to evade immune attack, and the tumor microenvironment is immunosuppressive. Immune responses are regulated by a number of immunological checkpoints that promote protective immunity and maintain tolerance. T cell coinhibitory pathways restrict the strength and duration of immune responses, thereby limiting immune-mediated tissue damage, controlling resolution of inflammation, and maintaining tolerance to prevent autoimmunity. Tumors exploit these coinhibitory pathways to evade immune eradication. Blockade of the PD-1 and CTLA-4 checkpoints is proving to be an effective and durable cancer immunotherapy in a subset of patients with a variety of tumor types, and additional combinations are further improving response rates. In this review we discuss the immunoregulatory functions of coinhibitory pathways and their translation to effective immunotherapies for cancer.


Assuntos
Anticorpos Monoclonais/uso terapêutico , Antígeno B7-H1/imunologia , Antígeno CTLA-4/imunologia , Imunoterapia/métodos , Neoplasias/terapia , Receptor de Morte Celular Programada 1/imunologia , Linfócitos T/imunologia , Animais , Humanos , Imunoterapia/tendências , Ativação Linfocitária/efeitos dos fármacos , Neoplasias/imunologia , Evasão Tumoral , Microambiente Tumoral
11.
Cell ; 186(22): 4773-4787.e12, 2023 10 26.
Artigo em Inglês | MEDLINE | ID: mdl-37806310

RESUMO

Pollen-pistil interactions establish interspecific/intergeneric pre-zygotic hybridization barriers in plants. The rejection of undesired pollen at the stigma is crucial to avoid outcrossing but can be overcome with the support of mentor pollen. The mechanisms underlying this hybridization barrier are largely unknown. Here, in Arabidopsis, we demonstrate that receptor-like kinases FERONIA/CURVY1/ANJEA/HERCULES RECEPTOR KINASE 1 and cell wall proteins LRX3/4/5 interact on papilla cell surfaces with autocrine stigmatic RALF1/22/23/33 peptide ligands (sRALFs) to establish a lock that blocks the penetration of undesired pollen tubes. Compatible pollen-derived RALF10/11/12/13/25/26/30 peptides (pRALFs) act as a key, outcompeting sRALFs and enabling pollen tube penetration. By treating Arabidopsis stigmas with synthetic pRALFs, we unlock the barrier, facilitating pollen tube penetration from distantly related Brassicaceae species and resulting in interspecific/intergeneric hybrid embryo formation. Therefore, we uncover a "lock-and-key" system governing the hybridization breadth of interspecific/intergeneric crosses in Brassicaceae. Manipulating this system holds promise for facilitating broad hybridization in crops.


Assuntos
Proteínas de Arabidopsis , Arabidopsis , Hormônios Peptídicos , Arabidopsis/genética , Arabidopsis/metabolismo , Proteínas de Arabidopsis/genética , Proteínas de Arabidopsis/metabolismo , Brassicaceae/genética , Brassicaceae/metabolismo , Hormônios Peptídicos/metabolismo , Peptídeos/metabolismo , Pólen/metabolismo , Tubo Polínico/metabolismo , Isolamento Reprodutivo
12.
Cell ; 186(15): 3245-3260.e23, 2023 07 20.
Artigo em Inglês | MEDLINE | ID: mdl-37369203

RESUMO

Terrestrial organisms developed circadian rhythms for adaptation to Earth's quasi-24-h rotation. Achieving precise rhythms requires diurnal oscillation of fundamental biological processes, such as rhythmic shifts in the cellular translational landscape; however, regulatory mechanisms underlying rhythmic translation remain elusive. Here, we identified mammalian ATXN2 and ATXN2L as cooperating master regulators of rhythmic translation, through oscillating phase separation in the suprachiasmatic nucleus along circadian cycles. The spatiotemporal oscillating condensates facilitate sequential initiation of multiple cycling processes, from mRNA processing to protein translation, for selective genes including core clock genes. Depleting ATXN2 or 2L induces opposite alterations to the circadian period, whereas the absence of both disrupts translational activation cycles and weakens circadian rhythmicity in mice. Such cellular defect can be rescued by wild type, but not phase-separation-defective ATXN2. Together, we revealed that oscillating translation is regulated by spatiotemporal condensation of two master regulators to achieve precise circadian rhythm in mammals.


Assuntos
Relógios Circadianos , Camundongos , Animais , Relógios Circadianos/genética , Ritmo Circadiano/fisiologia , Núcleo Supraquiasmático/metabolismo , Processamento de Proteína Pós-Traducional , Mamíferos
13.
Cell ; 186(24): 5363-5374.e16, 2023 11 22.
Artigo em Inglês | MEDLINE | ID: mdl-37972591

RESUMO

Cav1.2 channels play crucial roles in various neuronal and physiological processes. Here, we present cryo-EM structures of human Cav1.2, both in its apo form and in complex with several drugs, as well as the peptide neurotoxin calciseptine. Most structures, apo or bound to calciseptine, amlodipine, or a combination of amiodarone and sofosbuvir, exhibit a consistent inactivated conformation with a sealed gate, three up voltage-sensing domains (VSDs), and a down VSDII. Calciseptine sits on the shoulder of the pore domain, away from the permeation path. In contrast, when pinaverium bromide, an antispasmodic drug, is inserted into a cavity reminiscent of the IFM-binding site in Nav channels, a series of structural changes occur, including upward movement of VSDII coupled with dilation of the selectivity filter and its surrounding segments in repeat III. Meanwhile, S4-5III merges with S5III to become a single helix, resulting in a widened but still non-conductive intracellular gate.


Assuntos
Canais de Cálcio Tipo L , Venenos Elapídicos , Humanos , Canais de Cálcio Tipo L/química , Canais de Cálcio Tipo L/metabolismo , Neurotoxinas , Domínios Proteicos , Microscopia Crioeletrônica
14.
Cell ; 186(17): 3686-3705.e32, 2023 08 17.
Artigo em Inglês | MEDLINE | ID: mdl-37595566

RESUMO

Mucosal-associated invariant T (MAIT) cells represent an abundant innate-like T cell subtype in the human liver. MAIT cells are assigned crucial roles in regulating immunity and inflammation, yet their role in liver cancer remains elusive. Here, we present a MAIT cell-centered profiling of hepatocellular carcinoma (HCC) using scRNA-seq, flow cytometry, and co-detection by indexing (CODEX) imaging of paired patient samples. These analyses highlight the heterogeneity and dysfunctionality of MAIT cells in HCC and their defective capacity to infiltrate liver tumors. Machine-learning tools were used to dissect the spatial cellular interaction network within the MAIT cell neighborhood. Co-localization in the adjacent liver and interaction between niche-occupying CSF1R+PD-L1+ tumor-associated macrophages (TAMs) and MAIT cells was identified as a key regulatory element of MAIT cell dysfunction. Perturbation of this cell-cell interaction in ex vivo co-culture studies using patient samples and murine models reinvigorated MAIT cell cytotoxicity. These studies suggest that aPD-1/aPD-L1 therapies target MAIT cells in HCC patients.


Assuntos
Carcinoma Hepatocelular , Neoplasias Hepáticas , Células T Invariantes Associadas à Mucosa , Animais , Humanos , Camundongos , Carcinoma Hepatocelular/imunologia , Carcinoma Hepatocelular/patologia , Neoplasias Hepáticas/imunologia , Neoplasias Hepáticas/patologia , Células T Invariantes Associadas à Mucosa/imunologia , Células T Invariantes Associadas à Mucosa/patologia , Macrófagos Associados a Tumor
15.
Cell ; 186(8): 1652-1669, 2023 04 13.
Artigo em Inglês | MEDLINE | ID: mdl-37059068

RESUMO

Immune checkpoint therapy (ICT) has dramatically altered clinical outcomes for cancer patients and conferred durable clinical benefits, including cure in a subset of patients. Varying response rates across tumor types and the need for predictive biomarkers to optimize patient selection to maximize efficacy and minimize toxicities prompted efforts to unravel immune and non-immune factors regulating the responses to ICT. This review highlights the biology of anti-tumor immunity underlying response and resistance to ICT, discusses efforts to address the current challenges with ICT, and outlines strategies to guide the development of subsequent clinical trials and combinatorial efforts with ICT.


Assuntos
Imunoterapia , Neoplasias , Humanos , Antígeno B7-H1 , Neoplasias/tratamento farmacológico , Ensaios Clínicos como Assunto , Inibidores de Checkpoint Imunológico/administração & dosagem
16.
Cell ; 185(16): 3025-3040.e6, 2022 08 04.
Artigo em Inglês | MEDLINE | ID: mdl-35882231

RESUMO

Non-allelic recombination between homologous repetitive elements contributes to evolution and human genetic disorders. Here, we combine short- and long-DNA read sequencing of repeat elements with a new bioinformatics pipeline to show that somatic recombination of Alu and L1 elements is widespread in the human genome. Our analysis uncovers tissue-specific non-allelic homologous recombination hallmarks; moreover, we find that centromeres and cancer-associated genes are enriched for retroelements that may act as recombination hotspots. We compare recombination profiles in human-induced pluripotent stem cells and differentiated neurons and find that the neuron-specific recombination of repeat elements accompanies chromatin changes during cell-fate determination. Finally, we report that somatic recombination profiles are altered in Parkinson's and Alzheimer's disease, suggesting a link between retroelement recombination and genomic instability in neurodegeneration. This work highlights a significant contribution of the somatic recombination of repeat elements to genomic diversity in health and disease.


Assuntos
Genoma Humano , Retroelementos , Elementos Alu/genética , Recombinação Homóloga , Humanos , Elementos Nucleotídeos Longos e Dispersos , Sequências Repetitivas de Ácido Nucleico
17.
Cell ; 185(11): 1986-2005.e26, 2022 05 26.
Artigo em Inglês | MEDLINE | ID: mdl-35525246

RESUMO

Unlike copy number variants (CNVs), inversions remain an underexplored genetic variation class. By integrating multiple genomic technologies, we discover 729 inversions in 41 human genomes. Approximately 85% of inversions <2 kbp form by twin-priming during L1 retrotransposition; 80% of the larger inversions are balanced and affect twice as many nucleotides as CNVs. Balanced inversions show an excess of common variants, and 72% are flanked by segmental duplications (SDs) or retrotransposons. Since flanking repeats promote non-allelic homologous recombination, we developed complementary approaches to identify recurrent inversion formation. We describe 40 recurrent inversions encompassing 0.6% of the genome, showing inversion rates up to 2.7 × 10-4 per locus per generation. Recurrent inversions exhibit a sex-chromosomal bias and co-localize with genomic disorder critical regions. We propose that inversion recurrence results in an elevated number of heterozygous carriers and structural SD diversity, which increases mutability in the population and predisposes specific haplotypes to disease-causing CNVs.


Assuntos
Inversão Cromossômica , Duplicações Segmentares Genômicas , Inversão Cromossômica/genética , Variações do Número de Cópias de DNA/genética , Genoma Humano , Genômica , Humanos
18.
Cell ; 185(11): 1924-1942.e23, 2022 05 26.
Artigo em Inglês | MEDLINE | ID: mdl-35525247

RESUMO

For many solid malignancies, lymph node (LN) involvement represents a harbinger of distant metastatic disease and, therefore, an important prognostic factor. Beyond its utility as a biomarker, whether and how LN metastasis plays an active role in shaping distant metastasis remains an open question. Here, we develop a syngeneic melanoma mouse model of LN metastasis to investigate how tumors spread to LNs and whether LN colonization influences metastasis to distant tissues. We show that an epigenetically instilled tumor-intrinsic interferon response program confers enhanced LN metastatic potential by enabling the evasion of NK cells and promoting LN colonization. LN metastases resist T cell-mediated cytotoxicity, induce antigen-specific regulatory T cells, and generate tumor-specific immune tolerance that subsequently facilitates distant tumor colonization. These effects extend to human cancers and other murine cancer models, implicating a conserved systemic mechanism by which malignancies spread to distant organs.


Assuntos
Linfonodos , Melanoma , Animais , Tolerância Imunológica , Imunoterapia , Metástase Linfática/patologia , Melanoma/patologia , Camundongos
19.
Cell ; 185(25): 4801-4810.e13, 2022 Dec 08.
Artigo em Inglês | MEDLINE | ID: mdl-36417914

RESUMO

Drug-drug interaction of the antiviral sofosbuvir and the antiarrhythmics amiodarone has been reported to cause fatal heartbeat slowing. Sofosbuvir and its analog, MNI-1, were reported to potentiate the inhibition of cardiomyocyte calcium handling by amiodarone, which functions as a multi-channel antagonist, and implicate its inhibitory effect on L-type Cav channels, but the molecular mechanism has remained unclear. Here we present systematic cryo-EM structural analysis of Cav1.1 and Cav1.3 treated with amiodarone or sofosbuvir alone, or sofosbuvir/MNI-1 combined with amiodarone. Whereas amiodarone alone occupies the dihydropyridine binding site, sofosbuvir is not found in the channel when applied on its own. In the presence of amiodarone, sofosbuvir/MNI-1 is anchored in the central cavity of the pore domain through specific interaction with amiodarone and directly obstructs the ion permeation path. Our study reveals the molecular basis for the physical, pharmacodynamic interaction of two drugs on the scaffold of Cav channels.


Assuntos
Amiodarona , Sofosbuvir , Sofosbuvir/efeitos adversos , Amiodarona/farmacologia , Antivirais/farmacologia , Miócitos Cardíacos/metabolismo , Sítios de Ligação , Canais de Cálcio Tipo L/metabolismo , Cálcio/metabolismo
20.
Cell ; 184(7): 1740-1756.e16, 2021 04 01.
Artigo em Inglês | MEDLINE | ID: mdl-33705688

RESUMO

The core symptoms of many neurological disorders have traditionally been thought to be caused by genetic variants affecting brain development and function. However, the gut microbiome, another important source of variation, can also influence specific behaviors. Thus, it is critical to unravel the contributions of host genetic variation, the microbiome, and their interactions to complex behaviors. Unexpectedly, we discovered that different maladaptive behaviors are interdependently regulated by the microbiome and host genes in the Cntnap2-/- model for neurodevelopmental disorders. The hyperactivity phenotype of Cntnap2-/- mice is caused by host genetics, whereas the social-behavior phenotype is mediated by the gut microbiome. Interestingly, specific microbial intervention selectively rescued the social deficits in Cntnap2-/- mice through upregulation of metabolites in the tetrahydrobiopterin synthesis pathway. Our findings that behavioral abnormalities could have distinct origins (host genetic versus microbial) may change the way we think about neurological disorders and how to treat them.


Assuntos
Microbioma Gastrointestinal , Locomoção , Comportamento Social , Animais , Bactérias/classificação , Bactérias/genética , Bactérias/isolamento & purificação , Biopterinas/análogos & derivados , Biopterinas/metabolismo , Modelos Animais de Doenças , Potenciais Pós-Sinápticos Excitadores , Transplante de Microbiota Fecal , Fezes/microbiologia , Limosilactobacillus reuteri/metabolismo , Limosilactobacillus reuteri/fisiologia , Proteínas de Membrana/deficiência , Proteínas de Membrana/genética , Camundongos , Camundongos Endogâmicos C57BL , Camundongos Knockout , Proteínas do Tecido Nervoso/deficiência , Proteínas do Tecido Nervoso/genética , Transtornos do Neurodesenvolvimento/genética , Transtornos do Neurodesenvolvimento/microbiologia , Transtornos do Neurodesenvolvimento/patologia , Transtornos do Neurodesenvolvimento/terapia , Análise de Componente Principal , Agitação Psicomotora/patologia , Transmissão Sináptica
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