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Cancer immunotherapy has been regarded as a promising strategy for cancer therapy by blocking immune checkpoints and evoking immunity to fight cancer, but its efficacy seems to be heterogeneous among patients. Manipulating the gut microbiota is a potential strategy for enhancing the efficacy of immunotherapy. Here, we report that MS-20, also known as "Symbiota®", a postbiotic that comprises abundant microbial metabolites generated from a soybean-based medium fermented with multiple strains of probiotics and yeast, inhibited colon and lung cancer growth in combination with an anti-programmed cell death 1 (PD1) antibody in xenograft mouse models. Mechanistically, MS-20 remodeled the immunological tumor microenvironment by increasing effector CD8+ T cells and downregulating PD1 expression, which were mediated by the gut microbiota. Fecal microbiota transplantation (FMT) from mice receiving MS-20 treatment to recipient mice increased CD8+ T-cell infiltration into the tumor microenvironment and significantly improved antitumor activity when combined with anti-PD1 therapy. Notably, the abundance of Ruminococcus bromii, which increased following MS-20 treatment, was positively associated with a reduced tumor burden and CD8+ T-cell infiltration in vivo. Furthermore, an ex vivo study revealed that MS-20 could alter the composition of the microbiota in cancer patients, resulting in distinct metabolic pathways associated with favorable responses to immunotherapy. Overall, MS-20 could act as a promising adjuvant agent for enhancing the efficacy of immune checkpoint-mediated antitumor therapy.
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Linfocitos T CD8-positivos , Microbioma Gastrointestinal , Receptor de Muerte Celular Programada 1 , Microambiente Tumoral , Animales , Ratones , Receptor de Muerte Celular Programada 1/antagonistas & inhibidores , Receptor de Muerte Celular Programada 1/inmunología , Receptor de Muerte Celular Programada 1/metabolismo , Humanos , Microambiente Tumoral/inmunología , Linfocitos T CD8-positivos/inmunología , Trasplante de Microbiota Fecal , Línea Celular Tumoral , Probióticos/administración & dosificación , Probióticos/farmacología , Inmunoterapia , Femenino , Neoplasias del Colon/inmunología , Neoplasias del Colon/terapia , Neoplasias del Colon/tratamiento farmacológico , Neoplasias del Colon/microbiología , Inhibidores de Puntos de Control Inmunológico/farmacología , Neoplasias Pulmonares/inmunología , Neoplasias Pulmonares/tratamiento farmacológico , Neoplasias Pulmonares/terapia , Ratones Endogámicos BALB C , Ensayos Antitumor por Modelo de XenoinjertoRESUMEN
A safety evaluation was performed of Symbiota®, which is made by a proprietary anaerobic fermentation process of soybean with multistrains of probiotics and a yeast. The battery of genotoxicity studies showed that Symbiota® has no genotoxic effects. Safety and tolerability were further assessed by acute or repeated dose 28- and 90-day rodent studies, and no alterations in clinical observations, ophthalmological examination, blood chemistry, urinalysis, or hematology were observed between the control group and the different dosing groups (1.5, 5, and 15 mL/kg/day). There were no adverse effects on specific tissues or organs in terms of weight and histopathology. Importantly, the Symbiota® treatment did not perturb hormones and other endocrine-related endpoints. Of note, the No-Observed-Adverse-Effect-Level was determined to be 15 mL/kg/day in rats. Moreover, a randomized, double-blind, placebo-controlled clinical trial was recently conducted with healthy volunteers who consumed 8 mL/day of placebo or Symbiota® for 8 weeks. Only mild adverse events were reported in both groups, and the blood chemistry and blood cell profiles were also similar between the two groups. In summary, this study concluded that the oral consumption of Symbiota® at 8 mL/day by the general population does not pose any human health concerns.
RESUMEN
This review addresses recent developments in the analyses of plasma amyloid beta (Aß) and total tau (t-tau) protein levels as biomarkers for discriminating amnestic mild cognitive impairment (aMCI) from Alzheimer disease (AD), using immunomagnetic reduction (IMR). Recent studies have focused on the differential diagnosis of normal controls (NCs) with aMCI or AD. Results of 15 clinical studies have demonstrated decrease in plasma Aß1-40 and increase in plasma Aß1-42 and t-tau levels in patients with aMCI and AD. For a given biomarker, effect size is determined by comparing the mean ratios of biomarker levels between two diagnostic groups. Effect sizes are less than 1 for Aß1-40 (0.606-1.032) but >1 for Aß1-42 (1.018-2.167) and t-tau (1.030-4.147) in aMCI and AD compared with NCs. The effect size of the plasma tau significantly increases the most as aMCI progresses to AD. Studies into the application of IMR to determine plasma Aß and tau levels as biomarkers for aMCI or AD have recently progressed. Future investigations should validate recently published results, preferably in patients with pathologically confirmed AD. In addition, effort should be directed toward standardizing the design of such studies and data analysis. Keywords: amyloid beta, plasma tau, Alzheimer disease, biomarker, mild cognitive impairment.
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Enfermedad de Alzheimer , Disfunción Cognitiva , Enfermedad de Alzheimer/diagnóstico , Péptidos beta-Amiloides , Biomarcadores , Disfunción Cognitiva/diagnóstico , Humanos , Proteínas tauRESUMEN
The tumorous niche may drive the plasticity of heterogeneity and cancer stemness, leading to drug resistance and metastasis, which is the main reason of treatment failure in most cancer patients. The aim of this study was to establish a tumor microenvironment (TME)-based screening to identify drugs that can specifically target cancer stem cells (CSCs) and cancer-associated fibroblasts (CAFs) in the TME. Methods: Lung cancer patient-derived cancer cell and CAFs were utilized to mimic the TME and reproduce the stemness properties of CSCs in vitro and develop a high-throughput drug screening platform with phenotypical parameters. Limiting dilution assay, sphere-forming and ALDH activity assay were utilized to measure the cancer stemness characteristics. In vivo patient-derived xenograft (PDX) models and single-cell RNA sequencing were used to evaluate the mechanisms of the compounds in CSCs and CAFs. Results: The TME-based drug screening platform could comprehensively evaluate the response of cancer cells, CSCs and CAFs to different treatments. Among the 1,524 compounds tested, several drugs were identified to have anti-CAFs, anticancer and anti-CSCs activities. Aloe-emodin and digoxin both show anticancer and anti-CSCs activity in vitro and in vivo, which was further confirmed in the lung cancer PDX model. The combination of digoxin and chemotherapy improved therapeutic efficacy. The single-cell transcriptomics analysis revealed that digoxin could suppress the CSCs subpopulation in CAFs-cocultured cancer cells and cytokine production in CAFs. Conclusions: The TME-based drug screening platform provides a tool to identify and repurpose compounds targeting cancer cells, CSCs and CAFs, which may accelerate drug development and therapeutic application for lung cancer patients.
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Reposicionamiento de Medicamentos/métodos , Células Madre Neoplásicas/efectos de los fármacos , Microambiente Tumoral/fisiología , Fibroblastos Asociados al Cáncer/efectos de los fármacos , Fibroblastos Asociados al Cáncer/patología , Línea Celular Tumoral , Proliferación Celular , Evaluación Preclínica de Medicamentos , Ensayos de Selección de Medicamentos Antitumorales/métodos , Detección Precoz del Cáncer , Fibroblastos/efectos de los fármacos , Fibroblastos/metabolismo , Humanos , Neoplasias Pulmonares/patología , Células Madre Neoplásicas/metabolismo , Preparaciones FarmacéuticasRESUMEN
We acquired multiphoton images of normal and lung adenocarcinoma cell lines in three dimensions. Image stacks of the cells were then processed to obtain nucleus-to-cytoplasm (N/C) ratios in two and three dimensions. While N/C ratios in three dimensions can be unambiguously determined from the volumetric ratios of the nucleus and cytoplasm, two-dimensional (2-D) N/C can vary depending on the axial plane selected for N/C ratio determination. We determined 2-D N/C ratios from three criteria: (1) axial position at which the nuclear area is the largest; (2) the largest 2-D N/C ratio value; and (3) axial position at the midpoint of nuclear axial position. We found that different definitions of 2-D N/C ratio will significantly affect its value. Furthermore, in general, larger variance was found in 2-D rather than three-dimensional (3-D) N/C ratios. Lack of ambiguity in definition and reduced variance suggest that 3-D N/C ratio is a better parameter for characterizing tumor cells in the clinical setting.
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Adenocarcinoma del Pulmón/diagnóstico por imagen , Núcleo Celular , Citoplasma , Imagenología Tridimensional , Neoplasias Pulmonares/diagnóstico por imagen , Línea Celular Tumoral , Color , Humanos , Procesamiento de Imagen Asistido por Computador/métodos , Microscopía Fluorescente , Metástasis de la Neoplasia , Tomografía de Coherencia ÓpticaRESUMEN
Dementia is a global burden of public health. Headache disorders are the third most common cause of disability worldwide and common problems in the elderly population. Few studies focused on the relationship between primary headache disorders (PHDs) and cognitive status, and the results remain controversial. The aim of this countrywide, population-based, retrospective study was to investigate potential association between PHDs and dementia risk.We enrolled 1346 cases with PHDs to match the 5384 individuals by age, gender and co-morbidities. The definition of PHDs, dementia, and risk factors of dementia was identified according to The International Classification of Diseases, Ninth Revision, Clinical Modification. Cox regression was administered for estimating hazard ratios (HR) for dementia.During more than 5 years of follow-up, PHDs individuals had 1.52 times (Pâ<.05) greater risk to develop all dementia compared with individuals without PHDs. Elderly (aged ≥65 years) patients with PHDs displayed significantly higher risk to develop all dementia (Pâ<.01) and non-Alzheimer non-vascular dementia (NAVD) Pâ<.01). Female PHDs individuals were at higher risk of suffering from all dementia (Pâ<.05) and NAVD (Pâ<.05). The influence of PHDs on all dementia was highest in the first 2 years of observation.The results indicated PHDs are linked to a temporarily increased risk for dementia, mainly NAVD, with age-specific and gender-dependent characteristics.
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Factores de Edad , Demencia/etiología , Cefaleas Primarias/complicaciones , Factores Sexuales , Adulto , Anciano , Bases de Datos Factuales , Demencia/epidemiología , Femenino , Cefaleas Primarias/psicología , Humanos , Clasificación Internacional de Enfermedades , Estudios Longitudinales , Masculino , Persona de Mediana Edad , Modelos de Riesgos Proporcionales , Análisis de Regresión , Estudios Retrospectivos , Factores de Riesgo , Taiwán/epidemiologíaRESUMEN
OBJECTIVE: Vascular calcification (VC) is a major cause of mortality in patients with end-stage renal diseases. Biomarkers to predict the progression of VC early are in urgent demand. APPROACH AND RESULTS: We identified circulating, cell-free microRNAs as potential biomarkers using in vitro VC models in which both rat and human aortic vascular smooth muscle cells were treated with high levels of phosphate to mimic uremic hyperphosphatemia. Using an Affymetrix microRNA array, we found that miR-125b and miR-382 expression levels declined significantly as biomineralization progressed, but this decline was only observed for miR-125b in the culture medium. A time-dependent decrease in aortic tissue and serum miR-125b levels was also found in both ex vivo and in vivo renal failure models. We examined the levels of circulating, cell-free miR-125b in sera from patients with end-stage renal diseases (n=88) and found an inverse association between the severity of VC and the circulating miR-125b level, irrespective of age or mineral-related hormones (odds ratio, 0.71; P=0.03). Furthermore, serum miR-125b levels on enrollment can predict VC progression years later (for high versus low, odds ratio, 0.14; P<0.01; for the highest versus lowest tertile and middle versus lowest tertile, odds ratio, 0.55 and 0.13; P=0.3 and <0.01, respectively). The uremic VC prediction efficacy using circulating miR-125b levels was also observed in an independent cohort (n=135). CONCLUSIONS: The results suggest that serum miR-125b levels are associated with VC severity and serve as a novel predictive marker for the risk of uremia-associated calcification progression.
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Enfermedades de la Aorta/etiología , MicroARNs/sangre , Músculo Liso Vascular/metabolismo , Miocitos del Músculo Liso/metabolismo , Uremia/etiología , Calcificación Vascular/etiología , Anciano , Anciano de 80 o más Años , Animales , Aorta Torácica/metabolismo , Aorta Torácica/patología , Enfermedades de la Aorta/sangre , Enfermedades de la Aorta/genética , Enfermedades de la Aorta/patología , Apoptosis , Células Cultivadas , Distribución de Chi-Cuadrado , Modelos Animales de Enfermedad , Progresión de la Enfermedad , Regulación hacia Abajo , Femenino , Marcadores Genéticos , Humanos , Hiperfosfatemia/sangre , Hiperfosfatemia/etiología , Hiperfosfatemia/genética , Estimación de Kaplan-Meier , Fallo Renal Crónico/sangre , Fallo Renal Crónico/etiología , Fallo Renal Crónico/genética , Modelos Logísticos , Masculino , MicroARNs/genética , Persona de Mediana Edad , Análisis Multivariante , Músculo Liso Vascular/patología , Miocitos del Músculo Liso/patología , Oportunidad Relativa , Valor Predictivo de las Pruebas , Ratas Sprague-Dawley , Factores de Riesgo , Índice de Severidad de la Enfermedad , Factores de Tiempo , Transfección , Uremia/sangre , Uremia/complicaciones , Uremia/genética , Calcificación Vascular/sangre , Calcificación Vascular/genética , Calcificación Vascular/patologíaRESUMEN
BACKGROUND: Headache such as migraine is associated with stroke. Studies focused on primary headache disorders (PHDs) as a risk factor for stroke are limited. The purpose of this population-based cohort study was to explore whether patients with PHDs were at a high risk for developing stroke. METHODS: A total of 1346 patients with PHDs were enrolled and compared with 5384 age-, gender- and co-morbidity-matched control cohorts. International Classification of Diseases, Clinical Modification codes were administered for the definition of PHDs, stroke, and stroke risk factors. Cox proportional-hazards regressions were performed for investigating hazard ratios (HR). RESULTS: PHDs patients exhibited a 1.49 times (95% CIâ:1.15-1.98, p < 0.01) higher risk for developing ischaemic stroke compared with that of control cohorts. Both migraine (HR = 1.22, 95% CIâ:1.13-1.97, p < 0.05) and tension-type headache (HR = 2.29, 95% CIâ:1.22-2.80, p < 0.01) were associated with an increased risk of ischemic stroke. Females with PHDs were at greater risk of developing ischaemic stroke (HR = 1.49, 95% CIâ:1.13-1.90, p < 0.01) than those without PHDs. PHDs patient aged 45 to 64 years displayed significantly higher risk to develop ischaemic stroke (HRâ=â1.50, 95% CI: 1.11-2.10, p < 0.05) than the matched controls. The impact of PHDs on ischaemic stroke risk became gradually apparent by different following time intervals beyond 2 years after first diagnosis. CONCLUSION: PHDs is suggestive of an incremental risk for ischaemic stroke with gender-dependent, age-specific and time-dependent characteristics.
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Cefaleas Primarias/diagnóstico , Cefaleas Primarias/epidemiología , Vigilancia de la Población , Accidente Cerebrovascular/diagnóstico , Accidente Cerebrovascular/epidemiología , Adulto , Anciano , Estudios de Cohortes , Comorbilidad , Femenino , Humanos , Estudios Longitudinales , Masculino , Persona de Mediana Edad , Trastornos Migrañosos/diagnóstico , Trastornos Migrañosos/epidemiología , Vigilancia de la Población/métodos , Distribución Aleatoria , Factores de Riesgo , Taiwán/epidemiología , Cefalea de Tipo Tensional/diagnóstico , Cefalea de Tipo Tensional/epidemiologíaRESUMEN
Postpartum depression (PPD) affects the health of women and is an important issue that impacts negatively on the happiness of affected families. Previous studies have demonstrated that PPD impairs the mother-child attachment, impacts the marital relationship, and may cause family dysfunction. Although PPD is a common phenomenon, the concept of PPD is easily confused with other similar concepts such as postpartum blues and postpartum psychosis, which may delay proper prevention and management. This paper identifies the definitions, characteristics, antecedents, and consequences of PPD as well as provides empirical screen measurements and examples of model, borderline, and contrary cases in order to differentiate between the concepts of PPD and other disorders using Walker and Avant's (2011) concept analysis methodology. Three defining characteristics of postpartum depression were identified. First, depression begins four to six weeks after delivery and continues for at least two weeks. Second, we benchmarked over 5 depressive symptoms. Third, postpartum depression may disrupt puerperal women's lives by making it difficult for them to care for their babies and to concentrate on daily tasks. We hope that this article enhances nurses' professional competences to detect PPD as early as possible and to promote the quality of care received by postpartum women and their family members.
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Depresión Posparto/diagnóstico , Adulto , Femenino , Humanos , EmbarazoRESUMEN
Cancer stem cells (CSCs) are a promising target for treating cancer, yet how CSC plasticity is maintained in vivo is unclear and is difficult to study in vitro. Here we establish a sustainable primary culture of Oct3/4(+)/Nanog(+) lung CSCs fed with CD90(+) cancer-associated fibroblasts (CAFs) to further advance our knowledge of preserving stem cells in the tumour microenvironment. Using transcriptomics we identify the paracrine network by which CAFs enrich CSCs through de-differentiation and reacquisition of stem cell-like properties. Specifically, we find that IGF1R signalling activation in cancer cells in the presence of CAFs expressing IGF-II can induce Nanog expression and promote stemness. Moreover, this paracrine signalling predicts overall and relapse-free survival in stage I non-small cell lung cancer (NSCLC) patients. IGF-II/IGF1R signalling blockade inhibits Nanog expression and attenuates cancer stem cell features. Our data demonstrate that CAFs constitute a supporting niche for cancer stemness, and targeting this paracrine signalling may present a new therapeutic strategy for NSCLC.
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Adenocarcinoma/genética , Carcinoma de Células Escamosas/genética , Fibroblastos/metabolismo , Neoplasias Pulmonares/genética , Células Madre Neoplásicas/metabolismo , Comunicación Paracrina , Carcinoma Pulmonar de Células Pequeñas/genética , Adenocarcinoma/metabolismo , Anciano , Anciano de 80 o más Años , Animales , Carcinoma de Células Escamosas/metabolismo , Células Cultivadas , Femenino , Perfilación de la Expresión Génica , Proteínas de Homeodominio/genética , Proteínas de Homeodominio/metabolismo , Humanos , Factor II del Crecimiento Similar a la Insulina/genética , Factor II del Crecimiento Similar a la Insulina/metabolismo , Neoplasias Pulmonares/metabolismo , Masculino , Ratones , Persona de Mediana Edad , Proteína Homeótica Nanog , Trasplante de Neoplasias , Factor 3 de Transcripción de Unión a Octámeros/genética , Factor 3 de Transcripción de Unión a Octámeros/metabolismo , Receptor IGF Tipo 1 , Receptores de Somatomedina/genética , Receptores de Somatomedina/metabolismo , Carcinoma Pulmonar de Células Pequeñas/metabolismo , Antígenos Thy-1/metabolismo , Microambiente TumoralRESUMEN
[This corrects the article on p. e40276 in vol. 7.].
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Proteínas de Drosophila/biosíntesis , Drosophila melanogaster/genética , Perfilación de la Expresión Génica/métodos , ARN Mensajero/genética , Animales , Encéfalo/citología , Encéfalo/metabolismo , Proteínas de Drosophila/genética , Drosophila melanogaster/metabolismo , Femenino , Genes Reporteros , Gliceraldehído-3-Fosfato Deshidrogenasas/biosíntesis , Gliceraldehído-3-Fosfato Deshidrogenasas/genética , Proteínas Fluorescentes Verdes/biosíntesis , Proteínas Fluorescentes Verdes/genética , Masculino , Neuronas/metabolismo , Especificidad de Órganos , Polirribosomas/metabolismo , Regiones Promotoras Genéticas , Biosíntesis de Proteínas , Proteoma/biosíntesis , Proteoma/genética , ARN Mensajero/aislamiento & purificación , ARN Mensajero/metabolismo , ARN Ribosómico 18S/biosíntesis , ARN Ribosómico 18S/genética , Proteínas Recombinantes de Fusión/biosíntesis , Proteínas Recombinantes de Fusión/genética , Proteínas Ribosómicas/biosíntesis , Proteínas Ribosómicas/genética , TranscriptomaRESUMEN
Selective area growth of single crystalline Sn-doped In2O3 (ITO) nanowires synthesized via vapor-liquid-solid (VLS) method at 600°C was applied to improve the field emission behavior owing to the reduction of screen effect. The enhanced field emission performance reveals the reduction of turn-on fields from 9.3 to 6.6 V µm-1 with increase of field enhancement factors (ß) from 1,621 to 1,857 after the selective area growth at 3 h. Moreover, we find that the screen effect also highly depends on the length of nanowires on the field emission performance. Consequently, the turn-on fields increase from 6.6 to 13.6 V µm-1 with decreasing ß values from 1,857 to 699 after the 10-h growth. The detailed screen effect in terms of electrical potential and NW density are investigated in details. The findings provide an effective way of improving the field emission properties for nanodevice application.
RESUMEN
Single crystalline Sn doped In(2)O(3) (ITO) NWs (nanowires) were synthesized via an Au-catalyzed VLS (vapor-liquid-solid) method at 600 °C. The different sizes (~20, ~40, ~80 nm) of the Au NPs (nanoparticles) provided the controllable diameters for ITO NWs during growth. Phase and microstructures confirmed by high-resolution transmission electron microscope images (HRTEM) and X-ray diffraction (XRD) spectra indicated that the phase of In(2)O(3) NWs had a growth direction of [100]. X-ray photoelectron spectroscopy (XPS) was employed to obtain the chemical compositions of the ITO NWs as well as the ratio of Sn/In and oxygen concentrations. The findings indicated that low resistivity was found for ITO NWs with smaller diameters due to higher concentrations of oxygen vacancies and less incorporation of Sn atoms inside the NWs. The resistivity of NWs increases with increasing diameter due to more Sn atoms being incorporated into the NW and their reduction of the amount of oxygen vacancies. Low resistivity NWs could be achieved again due to excess Sn atoms doped into the large diameter NWs. Therefore, by optimizing the well-controlled growth of the NW diameter and interface states, we are able to tune the electrical properties of Sn-doped ITO NWs.
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In Drosophila melanogaster few methods exist to perform rapid cell-type or tissue-specific expression profiling. A translating ribosome affinity purification (TRAP) method to profile actively translated mRNAs has been developed for use in a number of multicellular organisms although it has only been implemented to examine limited sets of cell- or tissue-types in these organisms. We have adapted the TRAP method for use in the versatile GAL4/UAS system of Drosophila allowing profiling of almost any tissue/cell-type with a single genetic cross. We created transgenic strains expressing a GFP-tagged ribosomal protein, RpL10A, under the control of the UAS promoter to perform cell-type specific translatome profiling. The GFP::RpL10A fusion protein incorporates efficiently into ribosomes and polysomes. Polysome affinity purification strongly enriches mRNAs from expected genes in the targeted tissues with sufficient sensitivity to analyze expression in small cell populations. This method can be used to determine the unique translatome profiles in different cell-types under varied physiological, pharmacological and pathological conditions.
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Proteínas de Drosophila/biosíntesis , Drosophila melanogaster/genética , Perfilación de la Expresión Génica/métodos , ARN Mensajero/genética , Animales , Encéfalo/citología , Encéfalo/metabolismo , Proteínas de Drosophila/genética , Drosophila melanogaster/metabolismo , Femenino , Genes Reporteros , Gliceraldehído-3-Fosfato Deshidrogenasas/biosíntesis , Gliceraldehído-3-Fosfato Deshidrogenasas/genética , Proteínas Fluorescentes Verdes/biosíntesis , Proteínas Fluorescentes Verdes/genética , Masculino , Neuronas/metabolismo , Especificidad de Órganos , Polirribosomas/metabolismo , Regiones Promotoras Genéticas , Biosíntesis de Proteínas , Proteoma/biosíntesis , Proteoma/genética , ARN Mensajero/aislamiento & purificación , ARN Mensajero/metabolismo , ARN Ribosómico 18S/biosíntesis , ARN Ribosómico 18S/genética , Proteínas Recombinantes de Fusión/biosíntesis , Proteínas Recombinantes de Fusión/genética , Proteínas Ribosómicas/biosíntesis , Proteínas Ribosómicas/genética , TranscriptomaRESUMEN
PURPOSE: To assess the correlations between retinal nerve fiber layer (RNFL) thickness measured with scanning laser polarimetry and visual field (VF) sensitivity in primary open-angle glaucoma (POAG) and primary angle-closure glaucoma (PACG). DESIGN: Prospective, comparative, observational cases series. METHODS: Fifty patients with POAG and 56 patients with PACG were examined using scanning laser polarimetry with variable corneal compensation (GDx VCC; Laser Diagnostic Technologies, Inc.) and Humphrey VF analyzer (Carl Zeiss Meditec, Inc.) between August 2005 and July 2006 at Taipei Veterans General Hospital. Correlations between RNFL thickness and VF sensitivity, expressed as mean sensitivity in both decibel and 1/Lambert scales, were estimated by the Spearman rank correlation coefficient (r(s)) and multivariate median regression models (pseudo R(2)). The correlations were determined globally and for 6 RNFL sectors and their corresponding VF regions. RESULTS: The correlation between RNFL thickness and mean sensitivity (in decibels) was weaker in the PACG group (r(s) = 0.38; P = .004; pseudo R(2) = 0.17) than in the POAG group (r(s) = 0.51; P < .001; pseudo R(2) = .31), but the difference in the magnitude of correlation was not significant (P = .42). With Bonferroni correction, the structure-function correlation was significant in the superotemporal (r(s) = 0.62), superonasal (r(s) = 0.56), inferonasal (r(s) = 0.53), and inferotemporal (r(s) = 0.50) sectors in the POAG group (all P < .001), whereas it was significant only in the superotemporal (r(s) = 0.53) and inferotemporal (r(s) = 0.48) sectors in the PACG group (both P < .001). The results were similar when mean sensitivity was expressed as 1/Lambert scale. CONCLUSIONS: Both POAG and PACG eyes had moderate structure-function correlations using scanning laser polarimetry. Compared with eyes with POAG, fewer RNFL sectors have significant structure-function correlations in eyes with PACG.
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Glaucoma de Ángulo Cerrado/fisiopatología , Glaucoma de Ángulo Abierto/fisiopatología , Fibras Nerviosas/patología , Células Ganglionares de la Retina/patología , Polarimetría de Barrido por Laser , Campos Visuales , Anciano , Femenino , Gonioscopía , Humanos , Masculino , Persona de Mediana Edad , Enfermedades del Nervio Óptico/fisiopatología , Estudios Prospectivos , Tonometría Ocular , Pruebas del Campo VisualRESUMEN
BACKGROUND: Clinical and experimental studies suggest that alteration of the expression level of the p53 gene and other damage responsive genes may be associated with chemoresistance in cancer patients. METHODS: The present study evaluated the differences of the basal levels of lymphocytic p53 and p21waf1 mRNA expression collected before receiving cisplatin-based chemotherapy between 48 chemo-ineffective lung cancer patients and 39 chemo-effective lung cancer patients using an optimized semi-quantitative multiplex reverse transcriptase-polymerase chain reaction (RT-PCR). RESULTS: The data indicated that the mean mRNA level of p53 gene in chemo-ineffective patients (0.66) was 26.9% higher than that of the chemo-effective patients (0.52) with statistical significance (P=0.03), and a significantly higher level of p21waf1 mRNA expression in the chemo-ineffective patients (P=0.03) was also observed. In addition, by the multiplex long quantitative PCR analysis, we demonstrated that chemo-ineffective and chemo-effective patients have similar amounts of UV damage on their p53 gene of lymphocyte DNA through equal UV treatment. CONCLUSION: Our results suggest that elevated levels of p53/p21waf1 mRNA in blood lymphocytes collected before chemotherapy may predict the chemoresponses of lung cancer patients.
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Carcinoma de Pulmón de Células no Pequeñas/metabolismo , Inhibidor p21 de las Quinasas Dependientes de la Ciclina/biosíntesis , Resistencia a Antineoplásicos/genética , Neoplasias Pulmonares/metabolismo , Linfocitos/metabolismo , Proteína p53 Supresora de Tumor/biosíntesis , Antineoplásicos/uso terapéutico , Biomarcadores de Tumor/análisis , Carcinoma de Pulmón de Células no Pequeñas/tratamiento farmacológico , Carcinoma de Pulmón de Células no Pequeñas/genética , Cisplatino/uso terapéutico , Genes p53/genética , Genes p53/efectos de la radiación , Humanos , Neoplasias Pulmonares/tratamiento farmacológico , Neoplasias Pulmonares/genética , ARN Mensajero , Reacción en Cadena de la Polimerasa de Transcriptasa InversaRESUMEN
The Saccharomyces cerevisiae splicing factors Ntr1 (also known as Spp382) and Ntr2 form a stable complex and can further associate with DExD/H-box RNA helicase Prp43 to form a functional complex, termed the NTR complex, which catalyzes spliceosome disassembly. We show that Prp43 interacts with Ntr1-Ntr2 in a dynamic manner. The Ntr1-Ntr2 complex can also bind to the spliceosome first, before recruiting Prp43 to catalyze disassembly. Binding of Ntr1-Ntr2 or Prp43 does not require ATP, but disassembly of the spliceosome requires hydrolysis of ATP. The NTR complex also dynamically interacts with U5 snRNP. Ntr2 interacts with U5 component Brr2 and is essential for both interactions of NTR with U5 and with the spliceosome. Ntr2 alone can also bind to U5 and to the spliceosome, suggesting a role of Ntr2 in mediating the binding of NTR to the spliceosome through its interaction with U5. Our results demonstrate that dynamic interactions of NTR with U5, through the interaction of Ntr2 with Brr2, and interactions of Ntr1 and Prp43 govern the recruitment of Prp43 to the spliceosome to mediate spliceosome disassembly.
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ARN Helicasas DEAD-box/metabolismo , Ribonucleoproteína Nuclear Pequeña U5/metabolismo , Proteínas de Saccharomyces cerevisiae/metabolismo , Saccharomyces cerevisiae/metabolismo , Empalmosomas/metabolismo , Adenosina Trifosfato/farmacología , Anticuerpos Antifúngicos/farmacología , Unión Proteica/efectos de los fármacos , Saccharomyces cerevisiae/efectos de los fármacos , Empalmosomas/efectos de los fármacosRESUMEN
We examined ultraviolet (UV) irradiation and cisplatin treatment damage formation and repair efficiency in the p53 tumor suppressor gene of various cultured cell lines and lymphocytes using a nonradioactive multiplex long quantitative polymerase chain reaction (QPCR) assay, which amplified a 7-kb fragment of the target gene and a 500-bp fragment of the template control to successfully increase the sensitivity and reliability of the assay. The multiplex long QPCR detected a lesion frequency of 0.63 lesions/10kb/10J/m(2) in the p53 gene of fibroblast cells. In addition, the multiplex long QPCR assay detected pronounced differences in the repair of UV damage in the p53 gene among repair-proficient CRL-1475 cells and repair-deficient XP-A and XP-C cells. The multiplex long QPCR assay was also evaluated as a sensitive assay for the detection of DNA damage induced by cisplatin. The data indicated that the lesion frequency in the p53 gene was 1.27-1.75 times higher in the H23 cisplatin-sensitive cell than in the H1435 cisplatin-resistant cell at the IC(70) dose. After 8-h and 24-h repair periods, only 13 and 75% of cisplatin-induced damage had been removed in the H23 cells, whereas these values were 92 and 100% in the H1435 cells. In addition, our data indicate that multiplex long QPCR is a sensitive method for validly estimating repair in freshly isolated lymphocytes. The results suggest that the current protocol of the multiplex long QPCR method can be used to assess the damage formation and repair efficiency of various agents at biologically relevant doses and to allow a more precise determination of gene-specific repair in disease susceptibility and drug resistance in epidemiological studies.