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BACKGROUND & AIMS: The pathological hallmark of nonalcoholic fatty liver disease (NAFLD) is an imbalance in hepatic lipid homeostasis, in which lipophagy has been found to play a vital role. However, the underlying molecular mechanisms remain unclear. We investigated the role of chaperone-mediated autophagy (CMA) in the pathogenesis of NAFLD. METHODS: CMA activity was evaluated in liver tissues from NAFLD patients and high-fat diet (HFD)-fed mice. Liver-specific LAMP2A-knockout mice and HepG2 cells lacking LAMP2A [L2A(-) cells] were used to investigate the influence of CMA on lipolysis in hepatocytes. The expression of Plin5, a lipid droplet (LD)-related protein, was also evaluated in human and mouse liver tissues and in [L2A(-)] cells. RESULTS: Here, we found disrupted CMA function in the livers of NAFLD patients and animal models, displaying obvious reduction of LAMP2A and concurrent with decreased levels of CMA-positive regulators. More LDs and higher serum triglycerides accumulated in liver-specific LAMP2A-knockout mice and L2A(-) cells under high-fat challenge. Meanwhile, deleting LAMP2A hindered LD breakdown but not increased LD formation. In addition, the LD-associated protein Plin5 is a CMA substrate, and its degradation through CMA is required for LD breakdown. CONCLUSIONS: We propose that the disruption of CMA-induced Plin5 degradation obstacles LD breakdown, explaining the lipid homeostasis imbalance in NAFLD.
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Autofagia Mediada por Chaperones , Enfermedad del Hígado Graso no Alcohólico , Animales , Homeostasis , Humanos , Metabolismo de los Lípidos , Lípidos , Hígado/metabolismo , Ratones , Enfermedad del Hígado Graso no Alcohólico/metabolismo , Perilipina-5/metabolismoRESUMEN
A number of studies show that acupuncture may help with labour and delivery. An NHS maternity acupuncture service providing birth preparation acupuncture has assessed its routine hospital maternity annual data from 2014 to 2016 to see what effect it had on labour and delivery outcomes. The data from this service was analysed and women who had birth preparation acupuncture were compared with those who did not receive it. Maternal age, parity and socio-economic status were considered confounders and were adjusted for in the analysis. Women who received acupuncture had more normal births (less surgical births) [OR 0.76 (0.64, 0.91)], required less intrapartum analgesia [OR 0.74 (0.63, 0.86)], fewer components of an induction of labour [OR 0.74 (0.61, 0.91)] and a reduced length of a hospital stay [OR 0.91 (0.87, 0.95)]. The patients highly valued the availability of acupuncture within the maternity service as it enhanced their patient journey.Impact statementWhat is already known on this subject? Numerous studies provide evidence for the effects of acupuncture in normalising pregnancy and birth. These effects include musculoskeletal preparation of the pelvis, cervical ripening, enhancing endogenous oxytocin release, and analgesic properties.What do the results of this study add? Our analysis shows that women who received birth preparation acupuncture had fewer surgical births, required less intrapartum analgesia, less components of induction of labour and had a reduced length of hospital stay, supporting the use of maternity acupuncture in normalising birth outcomes.What are the implications of these findings for clinical practice and/or further research? The findings show that acupuncture, by potentially normalising birth, may lead to reductions in costs of service. Further, additional research is required to see whether acupuncture is cost effective and could have an adjunctive role as a complementary therapy for improving birth outcomes and a woman's experience of childbirth.
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Terapia por Acupuntura/estadística & datos numéricos , Analgesia Obstétrica/estadística & datos numéricos , Parto Obstétrico/estadística & datos numéricos , Complicaciones del Trabajo de Parto/prevención & control , Atención Prenatal/estadística & datos numéricos , Terapia por Acupuntura/métodos , Adulto , Analgesia Obstétrica/métodos , Parto Obstétrico/métodos , Femenino , Humanos , Manejo del Dolor/métodos , Manejo del Dolor/estadística & datos numéricos , Embarazo , Atención Prenatal/métodos , Prueba de Estudio Conceptual , Medicina Estatal , Resultado del TratamientoAsunto(s)
Carcinoma Hepatocelular/cirugía , Enfermedades del Colon/cirugía , Fístula del Sistema Digestivo/etiología , Fístula del Sistema Digestivo/cirugía , Drenaje/métodos , Fístula/cirugía , Absceso Hepático/cirugía , Neoplasias Hepáticas/cirugía , Ablación por Radiofrecuencia/efectos adversos , Carcinoma Hepatocelular/patología , Enfermedades del Colon/etiología , Humanos , Absceso Hepático/etiología , Neoplasias Hepáticas/patología , Rotura Espontánea , Resultado del TratamientoRESUMEN
Although platinum-based chemotherapies have long been used as standard treatment in ovarian cancer, cisplatin resistance is a major problem that restricts its use. Herein, we investigate the biological function of SLC27A2 and its underlying mechanisms in regulating chemo-resistance in ovarian cancer. The findings show that SLC27A2 down-regulation in primary ovarian cancer tissues correlates with chemo-resistance and poor patient survival in our patient cohort. Significantly, we demonstrate that up-regulation of SLC27A2 by lentivirus-mediated p-SLC27A2 sensitizes ovarian cancer cells to cisplatin in vitro and in vivo via apoptosis. Mechanistic investigation reveals that miR-411 is the most strikingly over-expressed gene in response to ectopic expression of SLC27A2, but under-expressed in recurrent ovarian cancer tissues. Lower miR-411 expression contributes to ovarian cancer chemo-resistance in vitro and in vivo. Furthermore, SLC27A2 directly binds specific sites in the miR-411 promoter region and promoter activity decreases after mutation of putative SLC27A2-binding sites. This indicates that SLC27A2 is required for the transcriptional induction of miR-411. The luciferase assays also confirm that miR-411 directly targets ABCG2 in ovarian cancer, and overall findings establish the SLC27A2-miR-411-ABCG2 pathway in the regulation of ovarian cancer chemo-resistance with potential therapeutic applications.
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Antineoplásicos/farmacología , Coenzima A Ligasas/genética , Resistencia a Antineoplásicos , MicroARNs/genética , Neoplasias Ováricas/genética , Transportador de Casetes de Unión a ATP, Subfamilia G, Miembro 2/genética , Línea Celular Tumoral , Cisplatino , Femenino , Regulación Neoplásica de la Expresión Génica , Humanos , Proteínas de Neoplasias/genética , Recurrencia Local de Neoplasia , Neoplasias Ováricas/tratamiento farmacológicoRESUMEN
BACKGROUND: Faecal microbiota transplantation (FMT) has become routine in managing recurrent C. difficile infection (CDI) refractory to antibiotics. AIM: To compare clinical response and improvements in colonic microbiota diversity in subjects with recurrent CDI using different donor product. METHODS: Seventy-two subjects with ≥3 bouts of CDI were randomised in a double-blind study to receive fresh, frozen or lyophilised FMT product via colonoscopy from 50 g of stool per treatment from eight healthy donors. Recipients provided stools pre- and 7, 14 and 30 days post-FMT for C. difficile toxin and, in a subset, microbiome composition by 16S rRNA gene profiling. RESULTS: Overall resolution of CDI was 87% during 2 months of follow-up after FMT. Stool samples before FMT had significantly decreased bacterial diversity with a high proportion of Proteobacteria compared to donors. Cure rates were highest for the group receiving fresh product seen in 25/25 (100%), lowest for the lyophilised product 16/23 (78%; P = 0.022 vs. fresh and 0.255 vs. frozen) and intermediate for frozen product 20/24 (P = 0.233 vs. fresh). Microbial diversity was reconstituted by day 7 in the subjects receiving fresh or frozen product. Improvement in diversity was seen by day 7 in those randomised to lyophilised material with reconstitution by 30 days. CONCLUSIONS: Comparative efficacy in faecal microbiota transplantation was observed in subjects receiving fresh or frozen faecal product from the same donors. The lyophilised product had a slightly lowered efficacy compared with fresh product, but it resembled other treatments in microbial restoration 1 month after faecal microbiota transplantation.
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Infecciones por Clostridium/terapia , Trasplante de Microbiota Fecal , Adulto , Anciano , Anciano de 80 o más Años , Clostridioides difficile , Colonoscopía , Método Doble Ciego , Heces/microbiología , Femenino , Liofilización , Congelación , Humanos , Masculino , Microbiota/genética , Persona de Mediana Edad , ARN Ribosómico 16S/genética , Recurrencia , Manejo de Especímenes , Donantes de Tejidos , Adulto JovenRESUMEN
Prevalence of swine respiratory disease causes poor growth performance in and serious economic losses to the swine industry. In this study, a categorical trait of enzootic pneumonia-like (EPL) score representing the infection gradient of a respiratory disease, more likely enzootic pneumonia, was recorded in a herd of 332 Chinese Erhualian pigs. According to their EPL scores and the disease effect on weight gains, these pigs were grouped into controls (EPL score ≤ 1) and cases (EPL score > 1). The weight gain of the case group reduced significantly at days 180, 210, 240 and 300 as compared to the control group. The heritability of EPL score was estimated to be 0.24 based on the pedigree information using a linear mixed model. All 332 Erhualian pigs and their nine sire parents were genotyped with Illumina Porcine 60K SNP chips. Two genome-wide association studies were performed under a generalized linear mixed model and a case-control model respectively. In total, five loci surpassed the suggestive significance level (P = 2.98 × 10-5 ) on chromosomes 2, 8, 12 and 14. CXCL6, CXCL8, KIT and CTBP2 were highlighted as candidate genes that might play important roles in determining resistance/susceptibility to swine EP-like respiratory disease. The findings advance understanding of the genetic basis of resistance/susceptibility to respiratory disease in pigs.
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Predisposición Genética a la Enfermedad , Enfermedades Respiratorias/veterinaria , Enfermedades de los Porcinos/genética , Porcinos/genética , Animales , Cruzamiento , China , Femenino , Estudio de Asociación del Genoma Completo , Genotipo , Modelos Lineales , Masculino , Modelos Genéticos , Linaje , Fenotipo , Polimorfismo de Nucleótido Simple , Sitios de Carácter Cuantitativo , Enfermedades Respiratorias/genéticaRESUMEN
PURPOSE: Cervical cancer, which is treated by radiotherapy (RT) and chemoradiotherapy (CRT), has high morbidity and mortality in women. This study aimed to identify differences in gene response to CRT and RT. MATERIALS AND METHODS: GSE3578 was downloaded from Gene Expression Omnibus including specimens from 20 RT-treated patients and 19 CRT-treated patients. Differentially expressed genes (DEGs) were identified using siggenes package in R. Protein-protein interaction (PPI) network was visualized by cytoscape. MCODE and cytoscape was used separately to mine and construct modules in the PPI network. Transcription factor (TF)-DEG and miRNA-DEG pairs were predicted and then visualized by cytoscape. RESULTS: Total 22 upregulated and 181 downregulated genes were identified in CRT samples. Several functions were enriched for these DEGs. A module involving ZNF449 and ZNF673 was mined from the PPI network of downregulated genes. In the TF-DEG regulatory networks, downregulated GATA3 (which was modulated by SPI) was also a TF, as well as upregulated CDK6 was regulated by several TFs (e.g. GATA3). Hsa-miR-17, hsa-miR-34a, hsa-miR-124, hsa-miR-I185-2-3p, hsa- 1185-1-3p, and hsa-let-7f-2-3p were identified as key miRNAs in the miRNA-DEG regulatory network. Conclu- sion: CRT might cure cervical cancer by acting on those molecules that were more sensitive to CRT than CT.
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Neoplasias del Cuello Uterino/tratamiento farmacológico , Neoplasias del Cuello Uterino/radioterapia , Quimioradioterapia , Bases de Datos Genéticas , Femenino , Perfilación de la Expresión Génica , Humanos , Análisis por Micromatrices , Estudios Retrospectivos , Resultado del Tratamiento , Neoplasias del Cuello Uterino/genéticaRESUMEN
We discuss the SiGe island co-sputtering deposition on a microcrystalline silicon (µc-Si) buffer layer and the secondary island growth based on this pre-SiGe island layer. The growth phenomenon of SiGe islands on crystalline silicon (c-Si) is also investigated for comparison. The pre-SiGe layer grown on µc-Si exhibits a mixed-phase structure, including SiGe islands and amorphous SiGe (a-SiGe) alloy, while the layer deposited on c-Si shows a single-phase island structure. The preferential growth and Ostwald ripening growth are shown to be the secondary growth mechanism of SiGe islands on µc-Si and c-Si, respectively. This difference may result from the effect of amorphous phase Si (AP-Si) in µc-Si on the island growth. In addition, the Si-Ge intermixing behavior of the secondary-grown islands on µc-Si is interpreted by constructing the model of lateral atomic migration, while this behavior on c-Si is ascribed to traditional uphill atomic diffusion. It is found that the aspect ratios of the preferential-grown super islands are higher than those of the Ostwald-ripening ones. The lower lateral growth rate of super islands due to the lower surface energy of AP-Si on the µc-Si buffer layer for the non-wetting of Ge at 700 °C and the stronger Si-Ge intermixing effect at 730 °C may be responsible for this aspect ratio difference.
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BACKGROUND AND PURPOSE: ß2/3-subunit-selective modulation of GABAA receptors by valerenic acid (VA) is determined by the presence of transmembrane residue ß2/3N265. Currently, it is not known whether ß2/3N265 is part of VA's binding pocket or is involved in the transduction pathway of VA's action. The aim of this study was to clarify the localization of VA's binding pocket on GABAA receptors. EXPERIMENTAL APPROACH: Docking and a structure-based three-dimensional pharmacophore were employed to identify candidate amino acid residues that are likely to interact with VA. Selected amino acid residues were mutated, and VA-induced modulation of the resulting GABAA receptors expressed in Xenopus oocytes was analysed. KEY RESULTS: A binding pocket for VA at the ß(+) /α(-) interface encompassing amino acid ß3N265 was predicted. Mutational analysis of suggested amino acid residues revealed a complete loss of VA's activity on ß3M286W channels as well as significantly decreased efficacy and potency of VA on ß3N265S and ß3F289S receptors. In addition, reduced efficacy of VA-induced IGABA enhancement was also observed for α1M235W, ß3R269A and ß3M286A constructs. CONCLUSIONS AND IMPLICATIONS: Our data suggest that amino acid residues ß3N265, ß3F289, ß3M286, ß3R269 in the ß3 subunit, at or near the etomidate/propofol binding site(s), form part of a VA binding pocket. The identification of the binding pocket for VA is essential for elucidating its pharmacological effects and might also help to develop new selective GABAA receptor ligands.
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Indenos/farmacología , Receptores de GABA-A/metabolismo , Sesquiterpenos/farmacología , Animales , Sitios de Unión , Femenino , Simulación del Acoplamiento Molecular , Mutagénesis Sitio-Dirigida , Oocitos/metabolismo , Receptores de GABA-A/genética , Xenopus laevisRESUMEN
Although genetic predisposition plays a major role in the progression of systemic lupus erythematosus (SLE) and its variation in symptoms, the precise relationships between genetic changes and disease status are not well understood. Here, to demonstrate the effect of a single gene mutation on disease etiology, we examined two mouse models of SLE with the same genetic background but different Fas genes. Mice with the Fas(lpr) gene developed severe SLE with renal dysfunction and inflammatory responses in the lung and kidney. By contrast, mice with the Fas(+) gene showed disease-related abnormalities in the liver and joints. Patterns of inflammatory disease markers differed across organs between the two lines of mice. Fas(lpr) mice showed greater MMP signals in the kidney and IL-11 signals in the lung than Fas(+) mice. Fas(+) mice had higher IL-11 signal intensity in the knee region and higher CXCR4 signal intensity in the liver than Fas(lpr) mice. Our results exemplify the complexity of disease and suggest the need for individualized target-specific treatment regimens. Strengths and Limitations of this Study: Fas gene is a well characterized gene in this disease. The molecular components in human disease need more clinical data.
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Riñón/patología , Hígado/patología , Lupus Eritematoso Sistémico/genética , Receptor fas/genética , Envejecimiento/sangre , Animales , Femenino , Predisposición Genética a la Enfermedad , Interleucina-11/metabolismo , Riñón/metabolismo , Hígado/metabolismo , Metaloproteinasa 9 de la Matriz/sangre , Ratones , Ratones Transgénicos , Mutación/genética , Receptores CXCR4/metabolismo , Transducción de Señal/genéticaRESUMEN
Radix bupleuri (Chaihu), the dried root of the Bupleurum plant, is an important component of traditional Chinese medicine. In this study, we examined the genetic diversity of 11 Bupleurum strains, originating from 7 provinces in China, using amplified fragment length polymorphism analysis. A total of 274 polymorphic bands were obtained using 6 primer combinations, indicating a high level of polymorphism across all strains. An estimation of the relative relationships among strains revealed genetic distances ranging from 0.2183 to 0.7372, with an average of 0.4161. The 2 most closely related varieties were Bupleurum chinense DC. strains collected from Lushi, Henan, and Zhangjiakou, Hebei, with a genetic nearness of 0.2183. Hierarchical clustering divided the strains into 3 main groups, with B. falcatum L. from Hebei and Liaoning Provinces forming a cluster that diverged from that of B. smithii Wolff. and B. chinense DC. B. falcatum L. (Sandao chaihu), collected from Heze, Shandong, clustered independently of the other strains, suggesting that this strain may have been introduced from a different location or that it arose as a result of intraspecific variation. B. smithii Wolff. (Hei chaihu) was closely associated with B. scorzonerifolium Willd. (Nan chaihu) and B. chinense DC. (Bei chaihu), suggesting a common genetic origin.
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Bupleurum/genética , Variación Genética , Análisis del Polimorfismo de Longitud de Fragmentos Amplificados , Bupleurum/clasificación , Análisis por Conglomerados , FilogeniaRESUMEN
OBJECTIVE: Apply a previously described scoring system retrospectively to cases of canine primary immune-mediated haemolytic anaemia (pIMHA) to determine its accuracy and reliability for the determination of prognosis in Victoria, Australia. METHODS: Retrospective cohort study of 41 dogs diagnosed with pIMHA at the University of Melbourne Veterinary Hospital (UMVH) between August 2006 to December 2012. RESULTS: Of the 41 dogs included, 70.7% were female while 29.3% were male. The overall mortality in this study was 43.9%. The previously described prognostic scoring system when applied to cases of pIMHA in Victoria, Australia, was not found to show statistical significance for prognostification. None of the five prognostic factors were found to be independently significant for prognostification. CONCLUSION: Application of the previously described prognostic scoring system indicated that it may not be reliable for predicting prognoses of dogs with pIMHA in Victoria, Australia.
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Anemia Hemolítica Autoinmune/veterinaria , Enfermedades de los Perros/diagnóstico , Anemia Hemolítica Autoinmune/sangre , Anemia Hemolítica Autoinmune/diagnóstico , Anemia Hemolítica Autoinmune/tratamiento farmacológico , Anemia Hemolítica Autoinmune/mortalidad , Animales , Proteínas Sanguíneas/análisis , Enfermedades de los Perros/sangre , Enfermedades de los Perros/tratamiento farmacológico , Enfermedades de los Perros/mortalidad , Perros , Femenino , Hematócrito/veterinaria , Inmunosupresores/uso terapéutico , Estimación de Kaplan-Meier , Masculino , Recuento de Plaquetas/veterinaria , Pronóstico , Estudios Retrospectivos , Índice de Severidad de la EnfermedadRESUMEN
The dependence of the electronic properties of a single Ge/Si quantum dot (QD) grown by the ion-beam sputtering deposition technique on growth temperature and QD diameter is investigated by conductive atomic force microscopy (CAFM). The Si-Ge intermixing effect is demonstrated to be important for the current distribution of single QDs. The current staircase induced by the Coulomb blockade effect is observed at higher growth temperatures (>700 °C) due to the formation of an additional barrier between dislocated QDs and Si substrate for the resonant tunneling of holes. According to the proposed single-hole-tunneling model, the fact that the intermixing effect is observed to increase as the incoherent QD size decreases may explain the increase in the starting voltage of the current staircase and the decrease in the current step width.
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Cytokine production by innate immunity is critical for shaping the adaptive immunity through regulation of T cell differentiation. In this report, we studied T cell immunoglobulin mucin domain protein 3 (Tim-3) expression on monocytes and its regulatory effect on interleukin-12 (IL-12)/IL-23 production by CD14(+) monocytes, as well as IL-17 production by CD4(+) T cells in individuals with chronic hepatitis C virus (HCV) infection. We found that Tim-3 and IL-23p19 are highly expressed and that IL-12p35 is inhibited in human CD14(+) monocytes, while IL-17 expression is upregulated in CD4(+) T cells, in chronically HCV-infected individuals compared to healthy subjects. Interestingly, Tim-3 expression is closely associated with the differential regulation of IL-12/IL-23 expression in CD14(+) monocytes and correlated to IL-17 production by CD4(+) T cells. These Tim-3-associated IL-12/IL-23/IL-17 dysregulations in HCV-infected individuals are also recapitulated in vitro by incubating healthy monocytes or peripheral blood mononuclear cells with Huh-7 hepatoma cells transfected with HCV RNA. Importantly, blocking Tim-3 signaling on monocytes restores the balance of IL-12/IL-23 through the intracellular STAT3 signaling, which in turn reverses the upregulated IL-17 expression both ex vivo and in vitro. Our findings suggest that Tim-3-mediated differential regulation of IL-12/IL-23 drives T(H)17 cell development, a milieu favoring viral persistence and autoimmune phenomenon during HCV infection.
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Diferenciación Celular , Hepatitis C Crónica/inmunología , Interleucina-12/biosíntesis , Interleucina-23/biosíntesis , Proteínas de la Membrana/metabolismo , Células Th17/inmunología , Receptor 2 Celular del Virus de la Hepatitis A , Humanos , Subgrupos Linfocitarios/inmunología , Subgrupos Linfocitarios/fisiología , Células Th17/fisiologíaRESUMEN
Breast cancer is a heterogenetic tumor at the cellular level with multiple factors and components. The inconsistent expression of molecular markers during disease progression reduces the accuracy of diagnosis and efficacy of target-specific therapy. Single target-specific imaging agents can only provide limited tumor information at one time point. In contrast, multiple target-specific imaging agents can increase the accuracy of diagnosis. The aim of this study was to demonstrate the ability of multi-agent imaging to discriminate such differences in single tumor. Mice bearing human cancer cell xenografts were tested to determine individual differences under optimal experimental conditions. Neovasculature agent (RGD peptide), tumor stromal agent (matrix metalloproteinase), and tumor cell markers (epidermal growth factor, Her-2, interleukin 11) imaging agents were labeled with reporters. 18F-Fluorodeoxyglucose was used to evaluate the tumor glucose status. Optical, X-ray, positron emission tomography, and computer tomography imaging modalities were used to determine tumor characteristics. Tumor size and imaging data demonstrated that individual differences exist under optimal experimental conditions. The target-specific agents used in the study bind to human breast cancer cell lines in vitro and xenografts in vivo. The pattern of binding corresponds to that of tumor markers. Multi-agent imaging had complementary effects in tumor detection. Multiple noninvasive imaging agents and modalities are complementary in the interrogation of unique biological information from each individual tumor. Such multi-agent approaches provide methods to study several disease components simultaneously. In addition, the imaging results provide information on disease status at the molecular level.
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Diagnóstico por Imagen/métodos , Neoplasias Mamarias Animales/diagnóstico , Animales , Neoplasias de la Mama/diagnóstico por imagen , Línea Celular Tumoral , Femenino , Fluorodesoxiglucosa F18 , Humanos , Procesamiento de Imagen Asistido por Computador , Neoplasias Mamarias Animales/diagnóstico por imagen , Ratones , Ratones Desnudos , Trasplante de Neoplasias , Oligopéptidos , Tomografía de Emisión de Positrones , Tomografía Computarizada por Rayos X , Trasplante HeterólogoRESUMEN
Liver cancer is the fifth most common cause of cancer deaths worldwide. Noninvasive diagnosis is difficult and the disease heterogeneity reduces the accuracy of pathological assays. Improvement in diagnostic imaging of specific molecular disease markers has provided hope for accurate and early noninvasive detection of liver cancer. However, all current imaging technologies, including ultrasonography, computed tomography (CT), positron emission tomography (PET), and magnetic resonance imaging, are not specific targets for detection of liver cancer. The aim of this study was to test the feasibility of injecting a cocktail of specific molecular imaging agents to noninvasively image liver cancer. The target-specific cocktail contained agents for imaging the neovasculature (RGD peptide), matrix metalloproteinase (MMP), and glucose transport ((18)F-fluorodeoxyglucose [(18)F-FDG]). Imaging studies were performed in liver cancer cells and xenograft models. The distribution of MMP at the intracellular level was imaged by confocal microscopy. RGD, MMP, and (18)F-FDG were imaged on tumor-bearing mice using PET, CT, X-ray, and multi-wavelength optical imaging modalities. Image data demonstrated that each agent bound to a specific disease target component. The same liver cancer xenograft contained multiple disease markers. Those disease markers were heterogenetically distributed in the same tumor nodule. The molecular imaging agents had different distributions in the whole body and inside the tumor nodule. All target-specific agents yielded high tumor-to-background ratios after injection. In conclusion, target-specific molecular imaging agents can be used to study liver cancer in vitro and in vivo. Noninvasive multimodal/multi-target-specific molecular imaging agents could provide tools to simultaneously study multiple liver cancer components.
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Bencenosulfonatos , Carbocianinas , Colorantes Fluorescentes , Fluorodesoxiglucosa F18 , Indoles , Neoplasias Hepáticas/diagnóstico por imagen , Oligopéptidos , Radiofármacos , Animales , Bencenosulfonatos/metabolismo , Línea Celular Tumoral , Fluorodesoxiglucosa F18/farmacocinética , Humanos , Indoles/metabolismo , Neoplasias Hepáticas/diagnóstico , Neoplasias Hepáticas/enzimología , Masculino , Metaloproteinasas de la Matriz/metabolismo , Ratones , Ratones Endogámicos C57BL , Microscopía Confocal , Imagen Multimodal , Trasplante de Neoplasias , Imagen Óptica/métodos , Tomografía de Emisión de Positrones , Radiofármacos/farmacocinética , Análisis de la Célula Individual , Distribución Tisular , Tomografía Computarizada por Rayos XRESUMEN
Hepatitis C virus (HCV) is remarkable at disrupting human immunity to establish chronic infection. Upregulation of inhibitory signaling pathways (such as T cell Ig and mucin domain protein-3 [Tim-3]) and accumulation of regulatory T cells (Tregs) play pivotal roles in suppressing antiviral effector T cell (Teff) responses that are essential for viral clearance. Although the Tim-3 pathway has been shown to negatively regulate Teffs, its role in regulating Foxp3(+) Tregs is poorly explored. In this study, we investigated whether and how the Tim-3 pathway alters Foxp3(+) Treg development and function in patients with chronic HCV infection. We found that Tim-3 was upregulated, not only on IL-2-producing CD4(+)CD25(+)Foxp3(-) Teffs, but also on CD4(+)CD25(+)Foxp3(+) Tregs, which accumulate in the peripheral blood of chronically HCV-infected individuals when compared with healthy subjects. Tim-3 expression on Foxp3(+) Tregs positively correlated with expression of the proliferation marker Ki67 on Tregs, but it was inversely associated with proliferation of IL-2-producing Teffs. Moreover, Foxp3(+) Tregs were found to be more resistant to, and Foxp3(-) Teffs more sensitive to, TCR activation-induced cell apoptosis, which was reversible by blocking Tim-3 signaling. Consistent with its role in T cell proliferation and apoptosis, blockade of Tim-3 on CD4(+)CD25(+) T cells promoted expansion of Teffs more substantially than Tregs through improving STAT-5 signaling, thus correcting the imbalance of Foxp3(+) Tregs/Foxp3(-) Teffs that was induced by HCV infection. Taken together, the Tim-3 pathway appears to control Treg and Teff balance through altering cell proliferation and apoptosis during HCV infection.
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Hepatitis C Crónica/inmunología , Hepatitis C Crónica/patología , Receptores Inmunológicos/fisiología , Transducción de Señal/inmunología , Subgrupos de Linfocitos T/inmunología , Subgrupos de Linfocitos T/virología , Linfocitos T Reguladores/inmunología , Linfocitos T Reguladores/virología , Proteínas Reguladoras de la Apoptosis/fisiología , Proliferación Celular , Factores de Transcripción Forkhead/biosíntesis , Factores de Transcripción Forkhead/fisiología , Hepatitis C Crónica/metabolismo , Humanos , Subunidad alfa del Receptor de Interleucina-2/biosíntesis , Subunidad alfa del Receptor de Interleucina-2/fisiología , Proyectos Piloto , Subgrupos de Linfocitos T/patología , Linfocitos T Reguladores/patología , Viremia/inmunología , Viremia/metabolismo , Viremia/patologíaRESUMEN
Hepatocellular carcinoma (HCC) is a fatal disease with great public health impact worldwide. Heme oxygenase (HO)-1 has recently been reported as an important player in tumor angiogenesis and metastasis. However, the role of HO-1 in liver cancer metastasis is unclear. In this study, we explored genetic differences and downstream signal transduction pathways of HO-1 in liver cancer cell lines. HO-1 wild-type and mutant cell lines were generated from human liver cancer cell line HepG2. The overexpression of wild-type HO-1 decreased the migration of HepG2 cells. In contrast, the overexpression of mutant HO-1G143H increased the migration of the cancer cells. Interleukin (IL)-6 is one of the major downstream molecules that mediated this process because IL-6 expression and migration are suppressed by HO-1 and increased when HO-1 is knocked down by shRNA. In addition, we demonstrated carbon monoxide (CO) and p38MAPK are the cofactors in this signal pathway. In vivo animal model demonstrated HO-1 inhibited the tumor growth. In conclusion, in vitro and in vivo data show HO-1 inhibits the human HCC cells migration and tumor growth by suppressing the expression of IL-6. The heme degradation product CO is a cofactor in this process and inhibits p38MAPK phosphorylation.
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Hemo-Oxigenasa 1/metabolismo , Neoplasias Hepáticas/patología , Metástasis de la Neoplasia , Animales , Secuencia de Bases , Línea Celular Tumoral , Cartilla de ADN , Ensayo de Inmunoadsorción Enzimática , Humanos , Interleucina-6/fisiología , Neoplasias Hepáticas/enzimología , Ratones , Ratones Endogámicos BALB C , Fosforilación , Reacción en Cadena de la Polimerasa de Transcriptasa Inversa , Transducción de Señal , Trasplante HeterólogoRESUMEN
Dihydro-oxadiazine and its derivatives have been demonstrated to be important heterocyclic scaffold platform with bioactive diversity, which present wide activities such as cardiovascular, antitumor, antibacterial, antimicrobial, acricidal, insecticidal, plant-growth regulating, chitin biosynthesis inhibitors and monoamine oxidase inhibition. Versatile features of dihydro-oxadiazine heterocycles have emerged, so the aim of the present paper was to review the recent advances of dihydro-oxadiazine-based heterocyclic derivatives mainly including synthesis and biological activities.