RESUMEN
FeSe is a unique high-[Formula: see text] iron-based superconductor in which nematicity, superconductivity, and magnetism are entangled with each other in the P-T phase diagram. We performed [Formula: see text]Se-nuclear magnetic resonance measurements under pressures of up to 3.9 GPa on 12% S-substituted FeSe, in which the complex overlap between the nematicity and magnetism are resolved. A pressure-induced Lifshitz transition was observed at 1.0 GPa as an anomaly of the density of states and as double superconducting (SC) domes accompanied by different types of antiferromagnetic (AF) fluctuations. The low-[Formula: see text] SC dome below 1 GPa is accompanied by strong AF fluctuations, whereas the high-[Formula: see text] SC dome develops above 1 GPa, where AF fluctuations are fairly weak. These results suggest the importance of the [Formula: see text] orbital and its intra-orbital coupling for the high-[Formula: see text] superconductivity.
Asunto(s)
Colelitiasis/complicaciones , Colestasis/etiología , Enfermedades Pancreáticas/complicaciones , Adulto , Carbonato de Calcio/análisis , Colangiopancreatografia Retrógrada Endoscópica , Colelitiasis/diagnóstico , Colelitiasis/cirugía , Colestasis/diagnóstico , Colestasis/cirugía , Duodenoscopía , Humanos , Masculino , Enfermedades Pancreáticas/diagnóstico , Enfermedades Pancreáticas/cirugía , Tomografía Computarizada por Rayos X , Resultado del TratamientoRESUMEN
BACKGROUND/AIM: Laminin-1 regulates neurite outgrowth in various neuronal cells. We have previously demonstrated that laminin-1 promotes enteric neural crest-derived cell (ENCC) migration by using Sox10-VENUS transgenic mice, in which ENCCs are labeled with a green fluorescent protein, Venus. Mice lacking the endothelin-B receptor gene, Ednrb -/- mice, are widely used as a model for Hirschsprung's disease (HD). The aim of this study was to investigate the effects of laminin-1on ENCC migration in Sox10-VENUS+/Ednrb -/- mice, a newly created HD mice model. METHODS: Fetal guts were dissected on embryonic day 12.5 (E12.5). Specimens were incubated either with, or without laminin-1 for 24 h and images were taken under a stereoscopic microscope. The length from the stomach to the wavefront of ENCC migration (L-E) and the total length of the gut (L-G) were measured. Changes in the ratio of L-E to L-G (L-E/L-G) after 24 h were calculated. RESULTS: On E12.5, the wavefront of ENCC migration in the HD gut samples was located in the midgut, whereas the wavefront of ENCC in Sox10-VENUS+/Ednrb +/+ (WT) samples had reached the hindgut. After 24 h, L-E/L-G had increased by 1.49%, from 34.97 to 36.46%, in HD gut and had increased by 1.07%, from 48.08 to 49.15%, in HD with laminin-1, suggesting there was no positive effect of laminin-1 administration on ENCC migration in HD. CONCLUSIONS: Our results suggest that laminin-1 does not have a positive effect on ENCC migration in HD mice on E12.5, in contrast to the phenomenon seen in normal mice gut specimens, where laminin-1 promotes ENCC migration during the same period. This suggests that there is an impairment in the interaction between ENCC and extracellular environmental factors, which are required for normal development of the enteric nervous system, resulting in an aganglionic colon in HD.
Asunto(s)
ADN/genética , Sistema Nervioso Entérico/patología , Enfermedad de Hirschsprung/genética , Laminina/genética , Cresta Neural/patología , Animales , Diferenciación Celular/fisiología , Movimiento Celular/fisiología , Células Cultivadas , Modelos Animales de Enfermedad , Sistema Nervioso Entérico/metabolismo , Regulación de la Expresión Génica , Enfermedad de Hirschsprung/metabolismo , Enfermedad de Hirschsprung/patología , Inmunohistoquímica , Laminina/biosíntesis , Ratones , Ratones Transgénicos , Cresta Neural/metabolismo , Reacción en Cadena de la PolimerasaRESUMEN
OBJECTIVE: Halitosis is caused by volatile sulphur compounds including methyl mercaptan (CH3 SH) in the oral cavity and is a serious problem that limits interpersonal social communication. The aim of study was to evaluate the effects of reuterin-related compounds (RRCs) on halitosis-related periodontopathic bacteria in vitro. MATERIALS AND METHODS: RRC-01, RRC-02 and RRC-03 (32 and 64 µg ml-1 ) in culture media containing Fusobacterium nucleatum JCM8523 and Porphyromonas gingivalis ATCC33277 were used. The effects of RRCs on CH3 SH production and detectable odour by F. nucleatum and P. gingivalis were examined by CH3 SH production assay and organoleptic test, respectively. The number of bacterial cells was also measured using an ATP assay. In P. gingivalis treated with RRCs, the expression of mgl gene, which is responsible for CH3 SH production, was examined by qRT-PCR. RESULTS: CH3 SH production and the score of detectable odour from F. nucleatum and P. gingivalis culture media containing RRCs were significantly lower than that without RRCs (P < 0.05). The expression of mgl gene in P. gingivalis was significantly downregulated by RRC-01 (P < 0.01), but not by RRC-02 or RRC-03. CONCLUSIONS: RRCs are potent oral care products for preventing halitosis via reducing CH3 SH production.
Asunto(s)
Antibacterianos/farmacología , Fusobacterium nucleatum/efectos de los fármacos , Gliceraldehído/análogos & derivados , Halitosis/microbiología , Odorantes/análisis , Porphyromonas gingivalis/efectos de los fármacos , Propano/farmacología , Antibacterianos/uso terapéutico , Biomarcadores/metabolismo , Fusobacterium nucleatum/metabolismo , Gliceraldehído/farmacología , Gliceraldehído/uso terapéutico , Halitosis/prevención & control , Humanos , Porphyromonas gingivalis/metabolismo , Propano/uso terapéutico , Compuestos de Sulfhidrilo/metabolismoRESUMEN
Metastasis is a critical factor contributing to poor prognosis in cancer, but the underlying mechanisms of metastasis are still poorly understood. We established a highly metastatic cell subline (HOC313-LM) derived from an oral squamous cell carcinoma cell line (HOC313) for uncovering the mechanisms of metastasis, and identified deoxyhypusine synthase (DHPS) as a metastasis-associated gene within the specific amplification at 19p13.2-p13.13 in HOC313-LM. DHPS-mediated hypusine-modification of eukaryotic translation factor 5A facilitated the translation of RhoA, resulting in the activation of the RhoA signaling pathway and leading to not only increased cell motility, invasion and metastasis of cancer cells in vitro, but also increased tumor growth in vivo. Moreover, the use of N1-Guanyl-1,7-diaminoheptane, a DHPS inhibitor, resulted in a significant decrease in tumor formation in vivo. In patients with esophageal squamous cell carcinoma (ESCC), overexpression of DHPS in ESCC tumors was significantly associated with worse recurrence-free survival, and correlated with distant metastasis. The elucidation of these molecular mechanisms within the hypusine cascade suggests opportunities for novel therapeutic targets in SCC.
Asunto(s)
Carcinoma de Células Escamosas/tratamiento farmacológico , Neoplasias Esofágicas/tratamiento farmacológico , Lisina/análogos & derivados , Oxidorreductasas actuantes sobre Donantes de Grupo CH-NH/genética , Proteína de Unión al GTP rhoA/genética , Adulto , Anciano , Animales , Carcinoma de Células Escamosas/genética , Carcinoma de Células Escamosas/patología , Línea Celular Tumoral , Movimiento Celular/genética , Proliferación Celular/efectos de los fármacos , Diaminas/administración & dosificación , Progresión de la Enfermedad , Neoplasias Esofágicas/genética , Neoplasias Esofágicas/patología , Carcinoma de Células Escamosas de Esófago , Femenino , Regulación Neoplásica de la Expresión Génica/efectos de los fármacos , Humanos , Lisina/biosíntesis , Lisina/genética , Masculino , Ratones , Persona de Mediana Edad , Metástasis de la Neoplasia , Oxidorreductasas actuantes sobre Donantes de Grupo CH-NH/antagonistas & inhibidores , Transducción de Señal/efectos de los fármacosRESUMEN
'Salvage chemoradiotherapy (CRT)' was introduced in 2005 to treat thoracic esophageal carcinomas deemed unresectable based on the intraoperative findings. The therapeutic concept is as follows: the surgical plan is changed to an operation that aims to achieve curability by the subsequent definitive CRT. For this purpose, the invading tumor is resected as much as possible, and systematic lymph node dissection is performed except for in the area around the bilateral recurrent nerves. The definitive CRT should be started as soon as possible and should be performed as planned. We hypothesized that this treatment would be feasible and provide good clinical effects. We herein verified this hypothesis. Twenty-seven patients who received salvage CRT were enrolled in the study, and their clinical course, therapeutic response, and prognosis were evaluated. The patients who had poor oral intake because of esophageal stenosis were able to eat solid food soon after the operation. The radiation field could be narrowed after surgery, and this might have contributed to the high rate of finishing the definitive CRT as planned. As a result, the overall response rate was 74.1%, and 48.1% of the patients had a complete response. No patient experienced fistula formation. The 1-, 3-, and 5-year overall survival rates were 66.5%, 35.2%, and 35.2%, respectively. Salvage CRT had clinical benefits, such as the fact that patients became able to have oral intake, that fistula formation could be prevented, that the adverse events associated with the definitive CRT could be reduced, and that prognosis of the patients was satisfactory. Although the rate of recurrent nerve paralysis was relatively high even after the suspension of aggressive bilateral recurrent nerve lymph node dissection, and the rate of the progressive disease after the definitive CRT was high, salvage CRT appears to provide some advantages for the patients who would otherwise not have other treatment options following a non-curative and residual operation.
Asunto(s)
Carcinoma de Células Escamosas/terapia , Quimioradioterapia/métodos , Neoplasias Esofágicas/terapia , Terapia Recuperativa/métodos , Adulto , Anciano , Carcinoma de Células Escamosas/patología , Supervivencia sin Enfermedad , Neoplasias Esofágicas/patología , Carcinoma de Células Escamosas de Esófago , Femenino , Humanos , Escisión del Ganglio Linfático , Metástasis Linfática , Masculino , Persona de Mediana Edad , Resultado del TratamientoRESUMEN
We studied double superconducting (SC) domes in LaFeAsO(1-x)H(x) by using 75As and 1H nuclear-magnetic-resonance techniques and unexpectedly discovered that a new antiferromagnetic (AF) phase follows the double SC domes on further H doping, forming a symmetric alignment of AF and SC phases in the electronic phase diagram. We demonstrated that the new AF ordering originates from the nesting between electron pockets, unlike the nesting between electron and hole pockets, as seen in the majority of undoped pnictides. The new AF ordering is derived from the features common to high-Tc pnictides; however, it has not been reported so far for other high-Tc pnictides because of their poor electron doping capability.
RESUMEN
BACKGROUND AND OBJECTIVE: Some clinical cases of hypoplastic tooth root are congenital. Because the formation of Hertwig's epithelial root sheath (HERS) is an important event for root development and growth, we have considered that understanding the HERS developmental mechanism contributes to elucidate the causal factors of the disease. To find integrant factors and phenomenon for HERS development and growth, we studied the proliferation and mobility of the cervical loop (CL). MATERIAL AND METHODS: We observed the cell movement of CL by the DiI labeling and organ culture system. To examine cell proliferation, we carried out immunostaining of CL and HERS using anti-Ki67 antibody. Cell motility in CL was observed by tooth germ slice organ culture using green fluorescent protein mouse. We also examined the expression of paxillin associated with cell movement. RESULTS: Imaging using DiI labeling showed that, at the apex of CL, the epithelium elongated in tandem with the growth of outer enamel epithelium (OEE). Cell proliferation assay using Ki67 immunostaining showed that OEE divided more actively than inner enamel epithelium (IEE) at the onset of HERS formation. Live imaging suggested that mobility of the OEE and cells in the apex of CL were more active than in IEE. The expression of paxillin was observed strongly in OEE and the apex of CL. CONCLUSION: The more active growth and movement of OEE cells contributed to HERS formation after reduction of the growth of IEE. The expression pattern of paxillin was involved in the active movement of OEE and HERS. The results will contribute to understand the HERS formation mechanism and elucidate the cause of anomaly root.
Asunto(s)
Órgano del Esmalte/embriología , Odontogénesis/fisiología , Corona del Diente/embriología , Germen Dentario/embriología , Raíz del Diente/embriología , Animales , Movimiento Celular/fisiología , Proliferación Celular , Esmalte Dental/citología , Esmalte Dental/embriología , Esmalte Dental/crecimiento & desarrollo , Órgano del Esmalte/citología , Órgano del Esmalte/crecimiento & desarrollo , Epitelio/embriología , Epitelio/crecimiento & desarrollo , Proteínas Fluorescentes Verdes , Antígeno Ki-67/análisis , Sustancias Luminiscentes , Ratones , Diente Molar/embriología , Diente Molar/crecimiento & desarrollo , Técnicas de Cultivo de Órganos , Paxillin/análisis , Corona del Diente/citología , Corona del Diente/crecimiento & desarrollo , Germen Dentario/citología , Germen Dentario/crecimiento & desarrollo , Raíz del Diente/citología , Raíz del Diente/crecimiento & desarrolloRESUMEN
OBJECTIVES: Behçet's disease (BD) is a multi-systemic inflammatory disease, characterised by recurrent oral aphthosis, genital ulcers, skin lesions and uveitis. We have reported excessive Th1 cell activity in patients with BD. More recently, Th17 cells were suggested to associate with several autoimmune diseases. This study was designed to investigate the role of Th17 related cytokines and signalling molecules in patients with BD. METHODS: We examined mRNA expressions of Th1 and Th17 related cytokines and related signalling molecules in PBMC of 12 patients with BD and 14 normal controls (NC) using quantitative RT-PCR. We studied expressions of the Th17 related cytokines in other four BD patients' skin lesions by immunofluorescence. RESULTS: Major Th17 related cytokines were not detected in unstimulated PBMC in patients with BD. After stimulation, mRNA expressions of TGFß receptor type 1, IL-12 receptor ß2 and suppressor of cytokine signalling protein (SOCS) 1 on PBMC were significantly enhanced in patients with BD, as compared with NC (p<0.05). mRNA expression of RORC, a key transcription factor for Th17 cell differentiation, was comparable between BD and NC. CD4+ T cells infiltrating into BD skin lesion expressed TGFß1 much more than those infiltrating into non-Behçet's disease erythema nodosum. CONCLUSIONS: These findings suggest that TGFß/Smad signalling pathway of T cells is overactive in patients with BD.
Asunto(s)
Síndrome de Behçet/metabolismo , Transducción de Señal , Piel/metabolismo , Proteína Smad2/metabolismo , Células Th17/metabolismo , Factor de Crecimiento Transformador beta1/metabolismo , Adulto , Síndrome de Behçet/genética , Síndrome de Behçet/inmunología , Estudios de Casos y Controles , Células Cultivadas , Citocinas/genética , Citocinas/metabolismo , Femenino , Técnica del Anticuerpo Fluorescente , Regulación de la Expresión Génica , Humanos , Masculino , Microscopía Confocal , Persona de Mediana Edad , Fosforilación , ARN Mensajero/metabolismo , Reacción en Cadena de la Polimerasa de Transcriptasa Inversa , Transducción de Señal/genética , Piel/inmunología , Proteína Smad2/genética , Células Th17/inmunologíaRESUMEN
Excessive T helper type 1 (Th1) cell activity has been reported in Behçet's disease (BD). Recently, association of Th17 cells with certain autoimmune diseases was reported, and we thus investigated circulating Th17 cells in BD. CD4(+) CD45RO(-) (naive) T cells were cultured with Th0-, Th1-, Th2- and Th17-related cytokines and antibodies, and their mRNA was studied by real-time polymerase chain reaction (PCR). When naive CD4(+) T cells were cultured with Th1- and Th17-related cytokines, interferon (IFN)-γ mRNA and interleukin (IL)-17 mRNA were up-regulated, respectively, in BD patients. Naive CD4(+) T cells cultured in a Th17 cell-inducing condition expressed IL-23 receptor (IL-23R) mRNA excessively. IL-17 mRNA expression was induced only when naive CD4(+) T cells were cultured in the presence of IL-23. CD4(+) T cells cultured with Th17 cytokines expressed excessive RAR-related orphan receptor C (RORC) mRNA. Using intracellular cytokine staining, we found that CD45RO(+) (memory) CD4(+) T cells producing IL-17 and IFN-γ simultaneously were increased significantly. Memory CD4(+) T cells producing IFN-γ but not IL-17 decreased profoundly in BD patients. CD4(+) T cells producing IL-17 and IFN-γ simultaneously were found in BD skin lesions. Collectively, we found excessive CD4(+) T cells producing IL-17 and IFN-γ (Th1/Th17) cells in patients with BD, and possible involvement of IL-23/IL-23R pathway for the appearance of excessive Th1/Th17 cells.
Asunto(s)
Síndrome de Behçet/inmunología , Linfocitos T CD4-Positivos/inmunología , Interferón gamma/biosíntesis , Interleucina-17/metabolismo , Adulto , Síndrome de Behçet/metabolismo , Síndrome de Behçet/patología , Linfocitos T CD4-Positivos/metabolismo , Células Cultivadas , Femenino , Humanos , Interleucina-17/biosíntesis , Interleucina-17/inmunología , Interleucina-23/biosíntesis , Interleucina-23/inmunología , Interleucina-23/metabolismo , Antígenos Comunes de Leucocito/genética , Masculino , Persona de Mediana Edad , Miembro 3 del Grupo F de la Subfamilia 1 de Receptores Nucleares/biosíntesis , ARN Mensajero/biosíntesis , ARN Mensajero/genética , Piel/inmunología , Piel/patología , Células TH1/inmunología , Células TH1/metabolismo , Células Th17/inmunologíaRESUMEN
BACKGROUND AND OBJECTIVE: It is well known that tooth root formation is initiated by the development of Hertwig's epithelial root sheath (HERS). However, relatively little is known about the regulatory mechanisms involved in root development. As hepatocyte growth factor (HGF) is one of the mediators of epithelial-mesenchymal interactions in rodent tooth, the objective of this study was to examine the effects of HGF on the root development of mouse molars. MATERIAL AND METHODS: The HERS of mouse molars and HERS01a, a cell line originated from HERS, were used in this study. For detection of HGF receptors in vivo and in vitro, we used immunochemical procedures. Root development was assessed by implanting molar tooth germs along with HGF-soaked beads into kidney capsules, by counting cell numbers in HERS01a cell cultures and by performing a 5'-bromo-2'-deoxyuridine (BrdU) assay in an organ-culture system. RESULTS: HGF receptors were expressed in the enamel epithelium of molar germs as well as in HERS cells. HGF stimulated root development in the transplanted tooth germs, the proliferation of HERS01a cells in culture and HERS elongation in the organ-culture system. Examination using BrdU revealed that cell proliferation in HERS was increased by treatment with HGF, especially that in the outer layer of HERS. This effect was down-regulated when antibody against HGF receptor was present in the culture medium. CONCLUSION: Our results raise the possibility that HGF signaling controls root formation via the development of HERS. This study is the first to show that HGF is one of the stimulators of root development.
Asunto(s)
Factor de Crecimiento de Hepatocito/fisiología , Diente Molar/crecimiento & desarrollo , Odontogénesis/efectos de los fármacos , Raíz del Diente/crecimiento & desarrollo , Animales , Antimetabolitos , Bromodesoxiuridina , Recuento de Células , Técnicas de Cultivo de Célula , Línea Celular , Proliferación Celular/efectos de los fármacos , Cemento Dental/citología , Cemento Dental/efectos de los fármacos , Dentina/citología , Dentina/efectos de los fármacos , Órgano del Esmalte/citología , Órgano del Esmalte/crecimiento & desarrollo , Células Epiteliales/citología , Células Epiteliales/efectos de los fármacos , Factor de Crecimiento de Hepatocito/farmacología , Inmunohistoquímica , Ratones , Diente Molar/citología , Diente Molar/efectos de los fármacos , Técnicas de Cultivo de Órganos , Proteínas Proto-Oncogénicas c-met/análisis , Ápice del Diente/citología , Ápice del Diente/efectos de los fármacos , Ápice del Diente/crecimiento & desarrollo , Germen Dentario/citología , Germen Dentario/crecimiento & desarrollo , Raíz del Diente/citología , Raíz del Diente/efectos de los fármacosRESUMEN
We have developed a pulmonary drug delivery system for the treatment of tuberculosis using rifampicin (RFP) encapsulated in poly-(lactic-co-glycolic acid) microspheres (RFP-PLGA MS), which is a biocompatible polymer. In this study, the behavior of RFP-PLGA MS and the metabolism of RFP were investigated after their uptake by macrophages using the rat alveolar macrophage cell line, NR8383. The prepared RFP-PLGA MS were spherical with an average diameter of 1.9microm and were taken up effectively by NR8383 cells in an energy-dependent manner. It was shown by fluorescent microscopic studies that the RPF-PLGA MS taken up by the cells were localized in phago-lysosomes and then degraded. Although a small amount of 3-formylrifamycin SV (3-FRSV) was generated by the metabolism of RFP, almost all RFP remained unchanged. It was considered, therefore, that RFP was released into the cytosol with drug potency intact. Based on these results, RFP-PLGA MS will be effective for the delivery of anti-tuberculosis drugs such as RFP, and will be a potentially useful drug delivery tool for pulmonary and possibly other tissues as well.
Asunto(s)
Ácido Láctico , Macrófagos Alveolares/efectos de los fármacos , Microesferas , Ácido Poliglicólico , Rifampin/farmacología , Animales , Línea Celular , Concentración de Iones de Hidrógeno , Macrófagos Alveolares/metabolismo , Microscopía Electrónica de Rastreo , Copolímero de Ácido Poliláctico-Ácido Poliglicólico , Ratas , Rifampin/metabolismo , Factores de TiempoRESUMEN
Azelnidipine has been reported to have antioxidant effects and attenuates tubulointerstitial ischemia. The aim of the present study was to determine whether azelnidipine exerts additional renoprotective effects to angiotensin II receptor blockers (ARBs) in hypertensive patients with diabetic nephropathy and microalbuminuria. 45 hypertensive patients with diabetes mellitus and microalbuminuria who were already being treated with ARBs were enrolled in this study. Azelnidipine was added to the drug treatment of 30 patients (8 mg/day, n = 15, or 16 mg/day, n = 15) whilst the remaining 15 control patients were not treated with azelnidipine. In all patients, urinary 8-hydroxydeoxyguanosine (8-OHdG) levels and urinary liver-type fatty acid-binding protein (L-FABP) levels were significantly correlated (r = 0.587, p = 0.0006). However, urinary albumin excretion (UAE) was not correlated with the levels of urinary 8-OHdG (r = 0.1975, p = 0.2956) or urinary L-FABP (r = 0.2057, p = 0.2759). Azelnidipine significantly reduced UAE, urinary 8-OHdG and urinary L-FABP after 6 (p < 0.05) and 12 months (p < 0.05). Although blood pressure was comparable between the azelnidipine doses of 8 and 16 mg/day, the UAE (p < 0.05 after 12 months), urinary 8-OHdG (p < 0.05 after 6 and 12 months) and urinary L-FABP (p < 0.05 after 6 and 12 months) levels were more significantly reduced in patients receiving the higher dose of 16 mg/day. These data may suggest that the addition of azelnidipine treatment to therapy with ARBs has dose-dependent antioxidant and renoprotective effects beyond blood pressure-lowering effects in hypertensive diabetic nephropathy patients.
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Bloqueadores del Receptor Tipo 1 de Angiotensina II/uso terapéutico , Ácido Azetidinocarboxílico/análogos & derivados , Nefropatías Diabéticas/tratamiento farmacológico , Dihidropiridinas/uso terapéutico , Riñón/efectos de los fármacos , 8-Hidroxi-2'-Desoxicoguanosina , Bloqueadores del Receptor Tipo 1 de Angiotensina II/administración & dosificación , Ácido Azetidinocarboxílico/administración & dosificación , Ácido Azetidinocarboxílico/uso terapéutico , Bloqueadores de los Canales de Calcio , Creatinina/orina , Desoxiguanosina/análogos & derivados , Desoxiguanosina/orina , Nefropatías Diabéticas/orina , Dihidropiridinas/administración & dosificación , Relación Dosis-Respuesta a Droga , Quimioterapia Combinada , Proteínas de Unión a Ácidos Grasos/orina , Femenino , Estudios de Seguimiento , Humanos , Masculino , Persona de Mediana Edad , Resultado del TratamientoRESUMEN
Junctional adhesion molecule 4 (JAM4) is a cell adhesion molecule that interacts with a tight junction protein, membrane-associated guanylate kinase inverted 1 (MAGI-1). Our previous studies suggest that JAM4 is implicated in the regulation of paracellular permeability and the signalings of hepatocyte growth factor. In this study, we performed yeast two-hybrid screening to search for an unidentified JAM4-binding protein and obtained one isoform of Ligand-of-Numb protein X1 (LNX1), LNXp70, that is an interactor of Numb. Ligand-of-Numb protein X1 is expressed in kidney glomeruli and intestinal epithelial cells, where JAM4 is also detected. Immunoprecipitation from kidney lysates supports the in vivo interaction of proteins. Biochemical studies reveal that JAM4 directly binds the second PDZ domain of LNX1 through its carboxyl terminus. Junctional adhesion molecule 4, LNX1 and Numb form a tripartite complex in vitro and are partially colocalized in heterologous cells. Ligand-of-Numb protein X1 facilitates endocytosis of JAM4 and is involved in transforming growth factor beta -induced redistribution of JAM4 in mammary epithelial cells. Experiments using dominant-negative constructs and RNA interference insure that Numb is necessary for the LNX1-mediated endocytosis of JAM4. All these findings indicate that LNX1 provides an endocytic scaffold for JAM4 that is implicated in the reorganization of cell junctions.
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Moléculas de Adhesión Celular/fisiología , Adhesión Celular/fisiología , Ubiquitina-Proteína Ligasas/fisiología , Animales , Células COS , Proteínas Portadoras/genética , Proteínas Portadoras/fisiología , Moléculas de Adhesión Celular/genética , Chlorocebus aethiops , Vectores Genéticos , Células HeLa , Humanos , Inmunohistoquímica , Uniones Intercelulares/fisiología , Péptidos y Proteínas de Señalización Intracelular , Ratones , Reacción en Cadena de la Polimerasa , Ratas , Transfección , Factor de Crecimiento Transformador beta/fisiología , Ubiquitina-Proteína Ligasas/genéticaRESUMEN
Hertwig's epithelial root sheath (HERS) plays an important role in tooth root formation. In this study, we examined root formation of the first molar in mice, focusing on cell proliferation, cell death, cell migration, and the expression patterns of the signaling molecules, including glycoproteins and proteoglycans between PN8 and PN26. The number of HERS cells decreased during root formation, although HERS retained total length until PN15. The migration of HERS cells did not occur during root formation. Moreover, the immunopositive reaction of laminin beta-3 and syndecan-1 in HERS indicates that both cell adhesion and cell proliferation are essential for HERS development. Bmp-2, Bmp-4, and Msx-2 were expressed in HERS cells during root formation. We also developed an in vitro culture system for investigating the periodontium and suggest that this system provides an excellent vehicle for full exploration, and hence improved understanding, of the development and regeneration of the periodontium. Together, our results provide a comprehensive model describing the morphogenesis of early root development in vertebrates.
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Órgano del Esmalte/crecimiento & desarrollo , Odontogénesis/fisiología , Raíz del Diente/crecimiento & desarrollo , Animales , Proteína Morfogenética Ósea 2 , Proteína Morfogenética Ósea 4 , Proteínas Morfogenéticas Óseas/análisis , Adhesión Celular , Muerte Celular , División Celular , Movimiento Celular , Técnicas de Cultivo , Proteínas de Unión al ADN/análisis , Epitelio/crecimiento & desarrollo , Glicoproteínas/análisis , Proteínas de Homeodominio/análisis , Laminina/análisis , Glicoproteínas de Membrana/análisis , Ratones , Ratones Endogámicos ICR , Morfogénesis/fisiología , Proteoglicanos/análisis , Sindecano-1 , Sindecanos , Factor de Crecimiento Transformador beta/análisisRESUMEN
Spin injection is found to have a significant effect on the transport properties of the Kondo alloy Cu(Fe). When a spin-polarized electron current flows from Co into Cu(Fe) wires through the Co/Cu(Fe) interface, the resistivity of the Cu(Fe) wire is suppressed near the interface, as distinct from the ordinary logarithmic increase in the resistivity at low temperatures. For the opposite current direction, no significant changes are observed. The asymmetry of the resistivity with respect to the current direction decays with a characteristic length of 1.5+/-0.4 microm at 2.5 K as the distance from the interface is increased. Possible mechanisms for the asymmetry are discussed.
RESUMEN
OBJECTIVES: To elucidate the maturational change of cortical auditory processing, we analyzed simultaneously recorded auditory evoked potentials (AEPs) and magnetic fields (AEFs) in school-aged children. METHODS: Simultaneous recording of AEP and AEF were performed in 32 healthy children of age ranging from 6 to 14 years and 10 adults. Tone bursts of 1 kHz were presented to the left and right ears alternately with 3 different within-ear stimulus onset asynchronies (SOAs) (1.6, 3.0 and 5.0 s for each ear) under attention-distracted condition. RESULTS: All subjects showed clear N100 and N100m peaks under the longest SOA condition (5.0 s). Under the shortest SOA condition (1.6 s), 4 out of 19 subjects under 12 years (21%) failed to show the N100m component. By contrast, N250 and N250m were observed in the majority of children (29/32: 91%) while those were detected in only 4 out of 10 adults (40%). The spatial distribution of N100 in children under 9 years differed from that in older subjects, whereas the dipole orientation of N100m was constant among age groups, suggesting that radially oriented sources might make additional contribution to the generation of N100 in early childhood. N250 was significantly larger in children than in adults. The strength of N250 was suppressed with longer SOAs, whereas that of N100 was enhanced. The dipole of N250m was located around Heschl's gyrus on the superior temporal plane which was significantly medial, anterior and inferior to that of N100m. CONCLUSIONS: Dissociation of maturational change between the tangential and radial components of N100 suggests that auditory processing at around 100 ms consists of multiple parallel pathways which mature independently. Furthermore, a negative peak at around 250 ms specifically seen in children has different generators from N100 and might represent a special auditory processing which takes an active part until acquisition of the efficient cortical networks of the adult brain.
Asunto(s)
Envejecimiento/fisiología , Percepción Auditiva/fisiología , Corteza Cerebral/fisiología , Potenciales Evocados Auditivos/fisiología , Estimulación Acústica , Adolescente , Adulto , Factores de Edad , Vías Auditivas/fisiología , Mapeo Encefálico , Niño , Electroencefalografía , Electrooculografía , Femenino , Humanos , Imagen por Resonancia Magnética , Magnetoencefalografía , Masculino , Tiempo de Reacción/fisiología , Valores de ReferenciaRESUMEN
This paper evaluates an elementary reaction mechanism for Hg0 oxidation in coal-derived exhausts consisting of a previously formulated homogeneous mechanism with 102 steps and a new three-step heterogeneous mechanism for unburned carbon (UBC) particles. Model predictions were evaluated with the extents of Hg oxidation monitored in the exhausts from a pilot-scale coal flame fired with five different coals. Exhaust conditions in the tests were very similar to those in full-scale systems. The predictions were quantitatively consistent with the reported coal-quality impacts over the full range of residence times. The role of Cl atoms in the homogeneous mechanism is hereby supplanted with carbon sites that have been chlorinated by HCl. The large storage capacity of carbon for Cl provided a source of Cl for Hg oxidation over a broad temperature range, so initiation was not problematic. Super-equilibrium levels of Cl atoms were not required, so Hg was predicted to oxidize in systems with realistic quench rates. Whereas many fundamental aspects of the heterogeneous chemistry remain uncertain, the information needed to characterize Hg oxidation in coal-derived exhausts is now evident: complete gas compositions (CO, hydrocarbons, H2O, O2 NOx, SOx), UBC properties (size, total surface area), and the ash partitioning throughout the exhaust system are required.
Asunto(s)
Contaminación del Aire/prevención & control , Carbón Mineral , Mercurio/química , Eliminación de Residuos , Contaminantes Atmosféricos/química , Incineración , Oxidación-Reducción , Tamaño de la Partícula , Dióxido de Azufre/químicaRESUMEN
OBJECTIVE: To clarify the influences of age on dietary intakes and plasma concentrations of fatty acids (FAs) in Japanese female dietitians. SUBJECTS AND METHODS: In autumn 1996, we estimated dietary FA intakes based on 7 day weighed diet records and analyzed plasma FA concentrations in 79 healthy Japanese female dietitians, and investigated their relationships with age, dividing into three age groups (young (32-42 y), middle-aged (43-50 y) and elderly (51-66 y)). RESULTS: Dietary intakes of total FA, saturated FAs, monounsaturated FAs, n-3 polyunsaturated FAs (PUFAs) and alpha-linolenic acid (18:3n-3) were significantly highest in the middle-aged group, and lowest in the elderly. Similar trends were observed for dietary intakes of n-6 PUFAs and linoleic acid (18:2n-6), but there were no differences with regard to eicosapentaenoic acid (EPA; 20:5n-3), docosahexaenoic acid (DHA; 22:6n-3) and n-3 highly unsaturated FAs (HUFAs=EPA+22:5n-3+DHA). On the other hand, plasma concentrations of all FAs except for arachidonic acid (20:4n-6) demonstrated positive correlations with age. Moreover, plasma concentrations of EPA in all age groups, DHA in the elderly and n-3 HUFAs in the middle-aged and the elderly were all positively correlated with dietary intakes. CONCLUSIONS: We should take into account the influence of age on dietary habit and lipid metabolism when interpreting associations between dietary FA intakes and plasma FA concentrations.