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1.
Nat Mater ; 22(5): 644-655, 2023 05.
Artículo en Inglés | MEDLINE | ID: mdl-36581770

RESUMEN

The process in which locally confined epithelial malignancies progressively evolve into invasive cancers is often promoted by unjamming, a phase transition from a solid-like to a liquid-like state, which occurs in various tissues. Whether this tissue-level mechanical transition impacts phenotypes during carcinoma progression remains unclear. Here we report that the large fluctuations in cell density that accompany unjamming result in repeated mechanical deformations of cells and nuclei. This triggers a cellular mechano-protective mechanism involving an increase in nuclear size and rigidity, heterochromatin redistribution and remodelling of the perinuclear actin architecture into actin rings. The chronic strains and stresses associated with unjamming together with the reduction of Lamin B1 levels eventually result in DNA damage and nuclear envelope ruptures, with the release of cytosolic DNA that activates a cGAS-STING (cyclic GMP-AMP synthase-signalling adaptor stimulator of interferon genes)-dependent cytosolic DNA response gene program. This mechanically driven transcriptional rewiring ultimately alters the cell state, with the emergence of malignant traits, including epithelial-to-mesenchymal plasticity phenotypes and chemoresistance in invasive breast carcinoma.


Asunto(s)
Actinas , Neoplasias , ADN , Nucleotidiltransferasas/genética , Nucleotidiltransferasas/metabolismo , Citosol/metabolismo , Transducción de Señal
2.
Int J Mol Sci ; 25(14)2024 Jul 11.
Artículo en Inglés | MEDLINE | ID: mdl-39062837

RESUMEN

Malignant pleural effusion (MPE) from patients with advanced non-small-cell lung cancer (NSCLC) has been proven valuable for molecular analysis; however, simultaneous detection of driver fusions in MPE is still challenging. In this study, we investigated the Idylla™ GeneFusion Panel, a stand-alone test in tissue samples, in the evaluation of ALK, ROS1, RET and MET ex14 skipping mutations in MPE and compared its performance with routine reference methods (Real-time-based and Next-generation Sequencing-NGS). The inclusion criteria for sample selection were as follows: advanced NSCLC harboring ALK, ROS1, RET fusions or MET exon-skipping alterations and the availability of MPE collected at diagnosis or disease progression. Molecular alterations have been investigated on tissue by fluorescence in situ hybridization (FISH) or Real-time PCR or NGS. For molecular profiling with the Idylla™ GeneFusion, 200 µL of MPE supernatants combined with 50 µL of RNA Later solution were loaded into the Idylla™ cartridge without cfRNA extraction. The Idylla™ GeneFusion Assay performed on MPEs was able to confirm molecular profile, previously diagnosed with conventional methods, in all cases. Our data confirm that MPE are suitable material for investigating fusion alterations. The Idylla™ GeneFusion, although indicated for investigation of tissue samples, offers the possibility of performing a molecular characterization of supernatants without undertaking the entire cfRNA extraction procedure providing a rapid and reliable strategy for the detection of actionable genetic alterations.


Asunto(s)
Carcinoma de Pulmón de Células no Pequeñas , Secuenciación de Nucleótidos de Alto Rendimiento , Neoplasias Pulmonares , Reacción en Cadena en Tiempo Real de la Polimerasa , Humanos , Carcinoma de Pulmón de Células no Pequeñas/genética , Neoplasias Pulmonares/genética , Neoplasias Pulmonares/patología , Secuenciación de Nucleótidos de Alto Rendimiento/métodos , Proyectos Piloto , Masculino , Femenino , Anciano , Persona de Mediana Edad , Reacción en Cadena en Tiempo Real de la Polimerasa/métodos , Derrame Pleural Maligno/genética , Derrame Pleural Maligno/patología , Derrame Pleural Maligno/diagnóstico , Proteínas de Fusión Oncogénica/genética , Fusión Génica , Adulto , Mutación , Quinasa de Linfoma Anaplásico/genética , Anciano de 80 o más Años , Proteínas Proto-Oncogénicas c-ret/genética , Proteínas Tirosina Quinasas , Proteínas Proto-Oncogénicas
3.
Curr Issues Mol Biol ; 44(2): 988-997, 2022 Feb 21.
Artículo en Inglés | MEDLINE | ID: mdl-35723350

RESUMEN

Nematodes, such as Caenorhabditis elegans, have been instrumental to the study of cancer. Recently, their significance as powerful cancer biodiagnostic tools has emerged, but also for mechanism analysis and drug discovery. It is expected that nematode-applied technology will facilitate research and development on the human tumor microenvironment. In the history of cancer research, which has been spurred by numerous discoveries since the last century, nematodes have been important model organisms for the discovery of cancer microenvironment. First, microRNAs (miRNAs), which are noncoding small RNAs that exert various functions to control cell differentiation, were first discovered in C. elegans and have been actively incorporated into cancer research, especially in the study of cancer genome defects. Second, the excellent sense of smell of nematodes has been applied to the diagnosis of diseases, especially refractory tumors, such as human pancreatic cancer, by sensing complex volatile compounds derived from heterogeneous cancer microenvironment, which are difficult to analyze using ordinary analytical methods. Third, a nematode model system can help evaluate invadosomes, the phenomenon of cell invasion by direct observation, which has provided a new direction for cancer research by contributing to the elucidation of complex cell-cell communications. In this cutting-edge review, we highlight milestones in cancer research history and, from a unique viewpoint, focus on recent information on the contributions of nematodes in cancer research towards precision medicine in humans.

4.
Prostate ; 82(14): 1400-1405, 2022 10.
Artículo en Inglés | MEDLINE | ID: mdl-35923120

RESUMEN

BACKGROUND: Recently a possible link between elevated Chromogranin A (CgA) levels and poorly differentiated prostate cancer has been proposed. The aim of our study was to explore the association of CgA levels and the risk of poorly differentiated prostate cancer (PCa) in men undergoing radical retropubic prostatectomy (RRP). MATERIALS AND METHODS: From 2012 onwards, 335 consecutive men undergoing RRP for PCa at three centers in Italy were enrolled into a prospective database. Body mass index (BMI) was calculated before RRP. Blood samples were collected and tested for total prostate-specific antigen (PSA) levels and chromogranin A (CgA). We evaluated the association between serum levels of CgA and upstaging and upgrading using logistic regression analyses. RESULTS: Median age and preoperative PSA levels were 65 years (interquartile range [IQR]: 60-69) and 7.2 ng/ml (IQR: 5.3-10.4), respectively. Median BMI was 26.1 kg/m2 (IQR: 24-29) with 56 (16%) obese (BMI ≥ 30 kg/m2 ). Median CgA levels were 51 (39/71). Overall, 129/335 (38,5%) presented an upstaging, and 99/335 (30%) presented an upgrading. CgA was not a predictor of upstaging or upgrading on RP. CONCLUSIONS: In our multicenter cohort of patients, CgA is not a predictor of poorly differentiated PCa on radical prostatectomy. According to our experience, CgA should not be considered a reliable marker to predict poorly differentiated or advanced prostate cancer.


Asunto(s)
Antígeno Prostático Específico , Neoplasias de la Próstata , Anciano , Cromogranina A , Cromograninas , Humanos , Masculino , Estadificación de Neoplasias , Prostatectomía/métodos , Neoplasias de la Próstata/patología
5.
Clin Immunol ; 240: 109048, 2022 07.
Artículo en Inglés | MEDLINE | ID: mdl-35644520

RESUMEN

Interactions between B cells and CD4+ T cells play a central role in the development of Type 1 Diabetes (T1D). Two helper cell subsets, follicular (Tfh) and peripheral (Tph) helper T cells, are increased in patients with T1D but their role in driving B cell autoimmunity is undefined. We used a personalized immune (PI) mouse model to generate human immune systems de novo from hematopoietic stem cells (HSCs) of patients with T1D or from healthy controls (HCs). Both groups developed Tfh and Tph-like cells, and those with T1D-derived immune systems demonstrated increased numbers of Tph-like and Tfh cells compared to HC-derived PI mice. T1D-derived immune systems included increased proportions of unconventional memory CD27-IgD- B cells and reduced proportions of naïve B cells compared to HC PI mice, resembling changes reported for patients with systemic lupus erythematosus. Our findings suggest that T1D HSCs are genetically programmed to produce increased proportions of T cells that promote the development of unconventional, possibly autoreactive memory B cells. PI mice provide an avenue for further understanding of the immune abnormalities that drive autoantibody pathogenesis and T1D.


Asunto(s)
Subgrupos de Linfocitos B , Diabetes Mellitus Tipo 1 , Animales , Autoinmunidad , Subgrupos de Linfocitos B/metabolismo , Células Madre Hematopoyéticas/metabolismo , Células Madre Hematopoyéticas/patología , Humanos , Ratones , Células T Auxiliares Foliculares , Linfocitos T Colaboradores-Inductores
6.
J Pathol ; 253(2): 234-245, 2021 02.
Artículo en Inglés | MEDLINE | ID: mdl-33140857

RESUMEN

The CDKN1B gene, encoding for the CDK inhibitor p27kip1 , is mutated in defined human cancer subtypes, including breast, prostate carcinomas and small intestine neuroendocrine tumors. Lessons learned from small intestine neuroendocrine tumors suggest that CDKN1B mutations could be subclonal, raising the question of whether a deeper sequencing approach could lead to the identification of higher numbers of patients with mutations. Here, we addressed this question and analyzed human cancer biopsies from breast (n = 396), ovarian (n = 110) and head and neck squamous carcinoma (n = 202) patients, using an ultra-deep sequencing approach. Notwithstanding this effort, the mutation rate of CDKN1B remained substantially aligned with values from the literature, showing that essentially only hormone receptor-positive breast cancer displayed CDKN1B mutations in a relevant number of cases (3%). However, the analysis of copy number variation showed that another fraction of luminal breast cancer displayed loss (8%) or gain (6%) of the CDKN1B gene, further reinforcing the idea that the function of p27kip1 is important in this type of tumor. Intriguingly, an enrichment for CDKN1B alterations was found in samples from premenopausal luminal breast cancer patients (n = 227, 4%) and in circulating cell-free DNA from metastatic luminal breast cancer patients (n = 59, 8.5%), suggesting that CDKN1B alterations could correlate with tumor aggressiveness and/or occur later during disease progression. Notably, many of the identified somatic mutations resulted in p27kip1 protein truncation, leading to loss of most of the protein or of its C-terminal domain. Using a gene-editing approach in a luminal breast cancer cell line, MCF-7, we observed that the expression of p27kip1 truncating mutants that lose the C-terminal domains failed to rescue most of the phenotypes induced by CDKN1B gene knockout, indicating that the functions retained by the C-terminal portion are critical for its role as an oncosuppressor, at least in luminal breast cancer. © 2020 The Authors. The Journal of Pathology published by John Wiley & Sons, Ltd. on behalf of The Pathological Society of Great Britain and Ireland.


Asunto(s)
Neoplasias de la Mama/genética , Inhibidor p27 de las Quinasas Dependientes de la Ciclina/metabolismo , Variaciones en el Número de Copia de ADN , Neoplasias Intestinales/genética , Tumores Neuroendocrinos/genética , Neoplasias de la Próstata/genética , Neoplasias de la Mama/patología , Inhibidor p27 de las Quinasas Dependientes de la Ciclina/genética , Femenino , Humanos , Neoplasias Intestinales/patología , Células MCF-7 , Masculino , Mutación , Tumores Neuroendocrinos/patología , Neoplasias de la Próstata/patología
7.
Int J Mol Sci ; 23(20)2022 Oct 18.
Artículo en Inglés | MEDLINE | ID: mdl-36293304

RESUMEN

Plasma small RNAs have been recently explored as biomarkers in Huntington's disease (HD). We performed an exploratory study on nine HD patients, eight healthy subjects (HS), and five psychiatric patients (PP; to control for iatrogenic confounder effects) through an Affymetrix-Gene-Chip-miRNA-Array. We validated the results in an independent population of 23 HD, 15 pre-HD, 24 PP, 28 Alzheimer's disease (AD) patients (to control the disease-specificity) and 22 HS through real-time PCR. The microarray results showed higher levels of U13 small nucleolar RNA (SNORD13) in HD patients than controls (fold change 1.54, p = 0.003 HD vs. HS, and 1.44, p = 0.0026 HD vs. PP). In the validation population, a significant increase emerged with respect to both pre-HD and the control groups (p < 0.0001). SNORD13 correlated with the status of the mutant huntingtin carrier (r = 0.73; p < 0.001) and the disease duration (r = 0.59; p = 0.003). The receiver operating characteristic (ROC) curve analysis showed the high accuracy of SNORD13 in discriminating HD patients from other groups (AUC = 0.963). An interactome and pathway analysis on SNORD13 revealed enrichments for factors relevant to HD pathogenesis. We report the unprecedented finding of a potential disease-specific role of SNORD13 in HD. It seems to peripherally report a 'tipping point' in the pathogenic cascade at the neuronal level.


Asunto(s)
Enfermedad de Huntington , MicroARNs , Humanos , Enfermedad de Huntington/genética , Enfermedad de Huntington/metabolismo , ARN Nucleolar Pequeño/genética , Proyectos Piloto , Proteína Huntingtina/genética , Biomarcadores
8.
Int J Mol Sci ; 23(23)2022 Nov 30.
Artículo en Inglés | MEDLINE | ID: mdl-36499368

RESUMEN

Idiopathic pulmonary fibrosis (IPF) is a disease characterized by progressive scarring of the lung that involves the pulmonary interstitium. The disease may rapidly progress, leading to respiratory failure, and the long-term survival is poor. There are no accurate biomarkers available so far. Our aim was to evaluate the expression of the B4GALT1 in patients with IPF. Analysis of B4GALT1 gene expression was performed in silico on two gene sets, retrieved from the Gene Expression Omnibus database. Expression of B4GALT1 was then evaluated, both at the mRNA and protein levels, on lung specimens obtained from lung biopsies of 4 IPF patients, on one IPF-derived human primary cell and on 11 cases of IPF associated with cancer. In silico re-analysis demonstrated that the B4GALT1 gene was overexpressed in patients and human cell cultures with IPF (p = 0.03). Network analysis demonstrated that B4GALT1 upregulation was correlated with genes belonging to the EMT pathway (p = 0.01). The overexpression of B4GALT1 was observed, both at mRNA and protein levels, in lung biopsies of our four IPF patients and in the IPF-derived human primary cell, in other fibrotic non-lung tissues, and in IPF associated with cancer. In conclusion, our results indicate that B4GALT1 is overexpressed in IPF and could represent a novel marker of this disease.


Asunto(s)
Fibrosis Pulmonar Idiopática , Neoplasias , Humanos , Fibrosis Pulmonar Idiopática/metabolismo , Pulmón/patología , Biomarcadores/metabolismo , ARN Mensajero/genética , ARN Mensajero/metabolismo , Neoplasias/metabolismo
9.
Xenotransplantation ; 28(4): e12691, 2021 07.
Artículo en Inglés | MEDLINE | ID: mdl-33904221

RESUMEN

BACKGROUND: A major obstacle to the success of organ transplantation from pigs to humans, necessitated by the shortage of human organs, is robust humoral immune rejection by pig-reactive human antibodies. Mixed xenogeneic hematopoietic chimerism induces xenoreactive B cell tolerance in rodents, but whether mixed pig/human chimerism could induce tolerance of human B cells to pig xenoantigens is unknown. METHODS: We investigated this question using a humanized mouse model in which durable mixed (pig-human) xenogeneic chimerism can be established. RESULTS: Human natural anti-pig cytotoxic antibodies, predominantly IgM, are detectable in non-chimeric humanized mouse serum, and pig-reactive antibodies were reduced in mixed chimeric versus non-chimeric humanized mice. This difference required persistent mixed chimerism and was not due to the adsorption of antibodies on pig cells in vivo. Furthermore, human B cells from spleens of mixed chimeric mice produced lower levels of anti-pig antibodies when stimulated in vitro compared with those from non-chimeric mice. CONCLUSIONS: Our findings demonstrate that mixed chimerism reduces human natural antibodies to pig xenoantigens, providing the first in vivo evidence of human B cell tolerance induction by mixed xenogeneic chimerism and supporting further evaluation of this approach for inducing human B cell tolerance to xenografts.


Asunto(s)
Quimerismo , Tolerancia Inmunológica , Animales , Antígenos Heterófilos , Linfocitos B , Trasplante de Médula Ósea , Humanos , Ratones , Porcinos , Trasplante Heterólogo
10.
Int J Mol Sci ; 22(14)2021 Jul 14.
Artículo en Inglés | MEDLINE | ID: mdl-34299168

RESUMEN

The recent advances in deciphering the human genome allow us to understand and evaluate the mechanisms of human genome age-associated transformations, which are largely unclear. Genome sequencing techniques assure comprehensive mapping of human genetics; however, understanding of gene functional interactions, specifically of time/age-dependent modifications, remain challenging. The age of the genome is defined by the sum of individual (inherited) and acquired genomic traits, based on internal and external factors that impact ontogenesis from the moment of egg fertilization and embryonic development. The biological part of genomic age opens a new perspective for intervention. The discovery of single cell-based mechanisms for genetic change indicates the possibility of influencing aging and associated disease burden, as well as metabolism. Cell populations with transformed genetic background were shown to serve as the origin of common diseases during extended life expectancy (superaging). Consequently, age-related cell transformation leads to cancer and cell degeneration (senescence). This article aims to describe current advances in the genomic mechanisms of senescence and its role in the spatiotemporal spread of epithelial clones and cell evolution.


Asunto(s)
Envejecimiento/patología , Senescencia Celular , Células Epiteliales/patología , Genoma Humano , Neoplasias/patología , Humanos , Neoplasias/etiología , Fenotipo
11.
Int J Mol Sci ; 22(14)2021 Jul 06.
Artículo en Inglés | MEDLINE | ID: mdl-34298902

RESUMEN

One-carbon (1C) metabolism plays a key role in biological functions linked to the folate cycle. These include nucleotide synthesis; the methylation of DNA, RNA, and proteins in the methionine cycle; and transsulfuration to maintain the redox condition of cancer stem cells in the tumor microenvironment. Recent studies have indicated that small therapeutic compounds affect the mitochondrial folate cycle, epitranscriptome (RNA methylation), and reactive oxygen species reactions in cancer cells. The epitranscriptome controls cellular biochemical reactions, but is also a platform for cell-to-cell interaction and cell transformation. We present an update of recent advances in the study of 1C metabolism related to cancer and demonstrate the areas where further research is needed. We also discuss approaches to therapeutic drug discovery using animal models and propose further steps toward developing precision cancer medicine.


Asunto(s)
Carbono/metabolismo , Neoplasias Gastrointestinales/metabolismo , Animales , Transformación Celular Neoplásica/metabolismo , Ácido Fólico/metabolismo , Humanos , Metilación , Mitocondrias/metabolismo , ARN/metabolismo , Especies Reactivas de Oxígeno/metabolismo
12.
Clin Immunol ; 211: 108319, 2020 02.
Artículo en Inglés | MEDLINE | ID: mdl-31794865

RESUMEN

Autoantibodies (AAbs) are a hallmark of Type 1 diabetes (T1D). Alterations in the frequency and phenotype of follicular helper (Tfh) T cells have been previously documented in patients with type 1 diabetes (T1D), but the contribution of follicular regulatory T (Treg) cells, which are responsible for suppressing AAb development, is less clear. Here, we investigated the frequency and activation status of follicular (CXCR5+) and conventional (CXCR5-) Treg cells in the blood of children with new-onset T1D, and children with risk for developing T1D (AAb-positive) and compared them to AAb-negative controls. Blood follicular and conventional Treg cells were higher in frequency in children with new onset T1D, but expressed reduced amounts of PD-1 as compared to AAb-negative children. Interestingly, the proportion of circulating FOXP3+ Tregs expressing PD-1 was also reduced in AAb-positive at-risk children as compared to AAb-negative controls, suggesting its potential use as a biomarker of disease progression. Follicular Treg cells were reduced in frequency in the spleens of prediabetic NOD mice as they became older and turned diabetic. Interestingly, PD-1 expression declined also on circulating follicular and conventional Treg cells in prediabetic NOD mice as they aged. Together, these findings show that the frequency of circulating follicular and conventional Treg cells and their levels of PD-1 change with disease progression in children at-risk for developing T1D and in NOD mice.


Asunto(s)
Diabetes Mellitus Tipo 1/inmunología , Receptor de Muerte Celular Programada 1/inmunología , Linfocitos T Reguladores/inmunología , Adolescente , Animales , Autoanticuerpos/inmunología , Niño , Preescolar , Progresión de la Enfermedad , Femenino , Factores de Transcripción Forkhead , Cabello/inmunología , Humanos , Islotes Pancreáticos/inmunología , Masculino , Ratones Endogámicos NOD , Receptores CXCR5
13.
J Clin Immunol ; 40(3): 447-455, 2020 04.
Artículo en Inglés | MEDLINE | ID: mdl-31993866

RESUMEN

Patients with Down syndrome (DS) are characterized by increased susceptibility to autoimmunity and respiratory tract infections that are suggestive of humoral immunity impairment. Here, we sought to determine the follicular helper (Tfh) and follicular regulatory (Tfr) T cell profile in the blood of children with DS. Blood was collected from 24 children with DS, nine of which had autoimmune diseases. Children with DS showed skewed Tfh differentiation towards the CXCR3+ phenotype: Tfh1 and Tfh1/17 subsets were increased, while Tfh2 and Tfh17 subsets were reduced. While no differences in the percentage of Tfr cells were seen, the ratio of Tfh1 and CXCR3+PD-1+ subsets to Tfr cells was significantly increased in the affected children. The excessive polarization towards a CXCR3+ phenotype in children with DS suggests that re-calibration of Tfh subset skewing could potentially offer new therapeutic opportunities for these patients.


Asunto(s)
Enfermedades Autoinmunes/inmunología , Síndrome de Down/inmunología , Centro Germinal/inmunología , Subgrupos de Linfocitos T/inmunología , Linfocitos T Colaboradores-Inductores/inmunología , Adolescente , Circulación Sanguínea , Diferenciación Celular , Células Cultivadas , Niño , Femenino , Humanos , Inmunidad Humoral , Masculino , Fenotipo , Receptores CXCR3/metabolismo , Balance Th1 - Th2
14.
Int J Mol Sci ; 21(8)2020 Apr 18.
Artículo en Inglés | MEDLINE | ID: mdl-32325767

RESUMEN

Since the infectious disease caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) was reported in China during December 2019, the coronavirus disease 2019 (COVID-19) has spread on a global scale, causing the World Health Organization (WHO) to issue a warning. While novel vaccines and drugs that target SARS-CoV-2 are under development, this review provides information on therapeutics which are under clinical trials or are proposed to antagonize SARS-CoV-2. Based on the information gained from the responses to other RNA coronaviruses, including the strains that cause severe acute respiratory syndrome (SARS)-coronaviruses and Middle East respiratory syndrome (MERS), drug repurposing might be a viable strategy. Since several antiviral therapies can inhibit viral replication cycles or relieve symptoms, mechanisms unique to RNA viruses will be important for the clinical development of antivirals against SARS-CoV-2. Given that several currently marketed drugs may be efficient therapeutic agents for severe COVID-19 cases, they may be beneficial for future viral pandemics and other infections caused by RNA viruses when standard treatments are unavailable.


Asunto(s)
Antivirales , Betacoronavirus , Infecciones por Coronavirus/tratamiento farmacológico , Neumonía Viral/tratamiento farmacológico , Antivirales/química , Antivirales/uso terapéutico , COVID-19 , China , Descubrimiento de Drogas , Humanos , Pandemias , SARS-CoV-2 , Tratamiento Farmacológico de COVID-19
15.
Int J Mol Sci ; 21(9)2020 Apr 30.
Artículo en Inglés | MEDLINE | ID: mdl-32365822

RESUMEN

It is known that single or isolated tumor cells enter cancer patients' circulatory systems. These circulating tumor cells (CTCs) are thought to be an effective tool for diagnosing cancer malignancy. However, handling CTC samples and evaluating CTC sequence analysis results are challenging. Recently, the convolutional neural network (CNN) model, a type of deep learning model, has been increasingly adopted for medical image analyses. However, it is controversial whether cell characteristics can be identified at the single-cell level by using machine learning methods. This study intends to verify whether an AI system could classify the sensitivity of anticancer drugs, based on cell morphology during culture. We constructed a CNN based on the VGG16 model that could predict the efficiency of antitumor drugs at the single-cell level. The machine learning revealed that our model could identify the effects of antitumor drugs with ~0.80 accuracies. Our results show that, in the future, realizing precision medicine to identify effective antitumor drugs for individual patients may be possible by extracting CTCs from blood and performing classification by using an AI system.


Asunto(s)
Aprendizaje Profundo , Resistencia a Antineoplásicos , Redes Neurales de la Computación , Antineoplásicos/farmacología , Antineoplásicos/uso terapéutico , Línea Celular Tumoral , Células Cultivadas , Humanos , Aprendizaje Automático , Neoplasias/tratamiento farmacológico , Neoplasias/genética , Neoplasias/metabolismo , Neoplasias/patología , Medicina de Precisión/métodos , Análisis de la Célula Individual
16.
J Biol Chem ; 293(5): 1688-1701, 2018 02 02.
Artículo en Inglés | MEDLINE | ID: mdl-29222332

RESUMEN

To provide protective immunity against circulating primary HIV-1 strains, a vaccine most likely has to induce broadly neutralizing antibodies to the HIV-1 envelope glycoprotein (Env) spike. Recombinant Env trimers such as the prototype BG505 SOSIP.664 that closely mimic the native Env spike can induce autologous neutralizing antibodies (NAbs) against relatively resistant (tier 2) primary viruses. Ideally, Env immunogens should present broadly neutralizing antibody epitopes but limit the presentation of immunodominant non-NAb epitopes that might induce off-target and potentially interfering responses. The V3 loop in gp120 is such a non-NAb epitope that can effectively elicit non-NAbs when animals are immunized with SOSIP.664 trimers. V3 immunogenicity can be diminished, but not abolished, by reducing the conformational flexibility of trimers via targeted sequence changes, including an A316W substitution in V3, that create the SOSIP.v4.1 and SOSIP.v5.2 variants. Here, we further modified these trimer designs by introducing leucine residues at V3 positions 306 and 308 to create hydrophobic interactions with the tryptophan residue at position 316 and with other topologically proximal sites in the V1V2 domain. Together, these modifications further stabilized the resulting SOSIP.v5.2 S306L/R308L trimers in the prefusion state in which V3 is sequestered. When we tested these trimers as immunogens in rabbits, the induction of V3 non-NAbs was significantly reduced compared with the SOSIP.v5.2 trimers and even more so compared with the SOSIP.664 prototype, without affecting the autologous NAb response. Hence, these additional trimer sequence modifications may be beneficial for immunization strategies that seek to minimize off-target non-NAb responses.


Asunto(s)
Anticuerpos Neutralizantes/química , Epítopos/química , Anticuerpos Anti-VIH/química , Proteína gp120 de Envoltorio del VIH/química , Multimerización de Proteína , Anticuerpos Neutralizantes/inmunología , Epítopos/inmunología , Células HEK293 , Anticuerpos Anti-VIH/inmunología , Proteína gp120 de Envoltorio del VIH/inmunología , Humanos , Interacciones Hidrofóbicas e Hidrofílicas , Estabilidad Proteica
18.
Anticancer Drugs ; 30(7): e0764, 2019 08.
Artículo en Inglés | MEDLINE | ID: mdl-30950836

RESUMEN

In the last few years, immunotherapy has become part of everyday clinical practice for the treatment of many solid tumors including metastatic non-small-cell lung cancer. These drugs, however, can yield a specific toxicity profile that consists of immune-related adverse events (irAEs). Hepatotoxicity is one of irAEs and occurs in about 1-3% of cases and may be manifested by the presence of increate levels of liver enzymes (aspartate aminotransferase, alanine aminotransferase) and/or biliary stasis evidence; in these cases, a differential diagnosis with other hepatic diseases must be considered. We present the case of a 73-year-old man who presented with an alteration in liver function during treatment with pembrolizumab (anti-programmed death 1 monoclonal antibody) for a stage IV nonsquamous non-small-cell lung cancer, which was initially mistaken for drug-induced irAEs hepatic toxicity.


Asunto(s)
Anticuerpos Monoclonales Humanizados/efectos adversos , Antineoplásicos Inmunológicos/efectos adversos , Carcinoma de Pulmón de Células no Pequeñas/tratamiento farmacológico , Efectos Colaterales y Reacciones Adversas Relacionados con Medicamentos/diagnóstico , Hepatopatías/diagnóstico , Neoplasias Pulmonares/tratamiento farmacológico , Anciano , Carcinoma de Pulmón de Células no Pequeñas/patología , Diagnóstico Diferencial , Efectos Colaterales y Reacciones Adversas Relacionados con Medicamentos/etiología , Efectos Colaterales y Reacciones Adversas Relacionados con Medicamentos/patología , Humanos , Hepatopatías/etiología , Hepatopatías/patología , Neoplasias Pulmonares/patología , Masculino , Pronóstico
19.
Mol Cancer ; 17(1): 71, 2018 03 09.
Artículo en Inglés | MEDLINE | ID: mdl-29523154

RESUMEN

Cutaneous melanoma (CM) is a malignancy with increasing occurrence. Its microRNA repertoire has been defined in a number studies, leading to candidates for biological and clinical relevance: miR-200a/b/c, miR-203, miR-205, miR-204, miR-211, miR-23b and miR-26a/b. Our work was aimed to validate the role of these candidate miRNAs in melanoma, using additional patients cohorts and in vitro cultures. miR-26a, miR-204 and miR-211 were more expressed in normal melanocytes, while miR-23b, miR-200b/c, miR-203 and miR-205 in epidermis and keratinocytes. None of the keratinocyte-related miRNAs was associated with any known mutation or with clinical covariates in melanoma. On the other hand, the loss of miR-204 was enriched in melanomas with NRAS sole mutation (Fisher exact test, P = 0.001, Log Odds = 1.67), and less frequent than expected in those harbouring CDKN2A mutations (Fisher exact test, P = 0.001, Log Odds - 1.09). Additionally, miR-204 was associated with better prognosis in two independent melanoma cohorts and its exogenous expression led to growth impairment in melanoma cell lines. Thus, miR-204 represents a relevant mechanism in melanoma, with potential prognostic value and its loss seems to act in the CDKN2A pathway, in cooperation with NRAS.


Asunto(s)
Regulación Neoplásica de la Expresión Génica , Técnicas de Silenciamiento del Gen , Melanoma/genética , MicroARNs/genética , Biomarcadores de Tumor , Femenino , Humanos , Masculino , Melanoma/mortalidad , Melanoma/patología , Mutación , Pronóstico
20.
Proc Natl Acad Sci U S A ; 112(45): 13916-21, 2015 Nov 10.
Artículo en Inglés | MEDLINE | ID: mdl-26512117

RESUMEN

The cyclin-dependent kinase (CDK) inhibitor p27(kip1) is a critical regulator of the G1/S-phase transition of the cell cycle and also regulates microtubule (MT) stability. This latter function is exerted by modulating the activity of stathmin, an MT-destabilizing protein, and by direct binding to MTs. We recently demonstrated that increased proliferation in p27(kip1)-null mice is reverted by concomitant deletion of stathmin in p27(kip1)/stathmin double-KO mice, suggesting that a CDK-independent function of p27(kip1) contributes to the control of cell proliferation. Whether the regulation of MT stability by p27(kip1) impinges on signaling pathway activation and contributes to the decision to enter the cell cycle is largely unknown. Here, we report that faster cell cycle entry of p27(kip1)-null cells was impaired by the concomitant deletion of stathmin. Using gene expression profiling coupled with bioinformatic analyses, we show that p27(kip1) and stathmin conjunctly control activation of the MAPK pathway. From a molecular point of view, we observed that p27(kip1), by controlling MT stability, impinges on H-Ras trafficking and ubiquitination levels, eventually restraining its full activation. Our study identifies a regulatory axis controlling the G1/S-phase transition, relying on the regulation of MT stability by p27(kip1) and finely controlling the spatiotemporal activation of the Ras-MAPK signaling pathway.


Asunto(s)
Ciclo Celular , Inhibidor p27 de las Quinasas Dependientes de la Ciclina/fisiología , Microtúbulos/metabolismo , Proteínas Quinasas Activadas por Mitógenos/metabolismo , Proteínas Proto-Oncogénicas p21(ras)/metabolismo , Animales , Inhibidor p27 de las Quinasas Dependientes de la Ciclina/metabolismo , Activación Enzimática , Ratones , Ratones Endogámicos C57BL , Unión Proteica , Estatmina/metabolismo
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