Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 33
Filtrar
Más filtros

Banco de datos
País/Región como asunto
Tipo del documento
País de afiliación
Intervalo de año de publicación
1.
Biosci Biotechnol Biochem ; 86(10): 1398-1404, 2022 Sep 23.
Artículo en Inglés | MEDLINE | ID: mdl-35948278

RESUMEN

Saccharomyces cerevisiae has 6 synonymous tRNATrpCCA genes encoding the identical sequence, including their intronic region. They are supposed to express tRNATrpCCA in the same quality and quantity. Here, we generated single to quintuple deletion strains with all the possible combinations of the synonymous tRNATrpCCA genes to analyze whether those individual genes equally contribute cell viability and tRNA production. The quintuple deletion strains that only harbor tW(CCA)J, tW(CCA)M, or tW(CCA)P were viable but almost lethal while the other quintuple deletions showed moderately impaired growth. These growth differences were not obvious among the quadruple deletion strains, which expressed almost one third of mature tRNATrpCCA in the wild type. Therefore, no dosage compensation operates for tRNATrpCCA amount, and growth variations among the quintuple deletion strains may not simply reflect differences in tRNATrpCCA shortage. Yeast may retain the redundancy of tRNATrpCCA genes for a noncanonical function(s) beyond the supply of the tRNA to translation.


Asunto(s)
Proteínas de Saccharomyces cerevisiae , Saccharomyces cerevisiae , Intrones , ARN de Transferencia/genética , ARN de Transferencia/metabolismo , Saccharomyces cerevisiae/genética , Saccharomyces cerevisiae/metabolismo , Proteínas de Saccharomyces cerevisiae/genética , Proteínas de Saccharomyces cerevisiae/metabolismo
2.
Nucleic Acids Res ; 47(11): 5936-5949, 2019 06 20.
Artículo en Inglés | MEDLINE | ID: mdl-30997502

RESUMEN

In eukaryotes and archaea, tRNA genes frequently contain introns, which are removed during maturation. However, biological roles of tRNA introns remain elusive. Here, we constructed a complete set of Saccharomyces cerevisiae strains in which the introns were removed from all the synonymous genes encoding 10 different tRNA species. All the intronless strains were viable, but the tRNAPheGAA and tRNATyrGUA intronless strains displayed slow growth, cold sensitivity and defective growth under respiratory conditions, indicating physiological importance of certain tRNA introns. Northern analyses revealed that removal of the introns from genes encoding three tRNAs reduced the amounts of the corresponding mature tRNAs, while it did not affect aminoacylation. Unexpectedly, the tRNALeuCAA intronless strain showed reduced 5.8S rRNA levels and abnormal nucleolar morphology. Because pseudouridine (Ψ) occurs at position 34 of the tRNAIleUAU anticodon in an intron-dependent manner, tRNAIleUAU in the intronless strain lost Ψ34. However, in a portion of tRNAIleUAU population, position 34 was converted into 5-carbamoylmethyluridine (ncm5U), which could reduce decoding fidelity. In summary, our results demonstrate that, while introns are dispensable for cell viability, some introns have diverse roles, such as ensuring proper growth under various conditions and controlling the appropriate anticodon modifications for accurate pairing with the codon.


Asunto(s)
Intrones , ARN de Transferencia/metabolismo , Saccharomyces cerevisiae/genética , Saccharomyces cerevisiae/metabolismo , Anticodón , Northern Blotting , Codón , Genoma Fúngico , Leucina/química , Mutación , Conformación de Ácido Nucleico , Fenotipo , Plásmidos/metabolismo , Seudouridina , ARN/química , Procesamiento Postranscripcional del ARN , ARN de Hongos/metabolismo , ARN Ribosómico 5.8S/metabolismo
3.
Biosci Biotechnol Biochem ; 81(9): 1778-1785, 2017 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-28693383

RESUMEN

MSA1 mRNA encodes Msa1p, a protein associated with the SCB-binding factor (SBF) and MCB-binding factor (MBF) complex. Msa1p promotes the transcription of G1 phase-specific genes, and is subjected to cell cycle-dependent regulation for its abundance and subcellular localization. MSA1 mRNA and Msa1p levels oscillate in the cell cycle with peaks at the late M/early G1 phase and early G1 phase, respectively. Phosphorylation by CDK1 negatively regulates the nuclear localization of Msa1p. In the present study, we identified MSA1 mRNA as a bud tip-localized mRNA in screening using a Tag-GFP system. A fragmentation analysis revealed a sequence of ~145 bases for the bud tip localization. Endogenous MSA1 mRNA localized at the bud tip in a manner that depended on SHE2. Msa1p levels were also affected by SHE2 in cells constitutively expressing MSA1 mRNA. These results suggest the existence of a regulatory mechanism for Msa1p through the localized control of MSA1 mRNA.


Asunto(s)
Proteínas de Ciclo Celular/genética , Proteínas de Ciclo Celular/metabolismo , Proteínas de Saccharomyces cerevisiae/genética , Proteínas de Saccharomyces cerevisiae/metabolismo , Saccharomyces cerevisiae/genética , Saccharomyces cerevisiae/metabolismo , Secuencia de Bases , ARN Mensajero/genética , ARN Mensajero/metabolismo , Proteínas de Unión al ARN/metabolismo , Transcripción Genética
4.
Biosci Biotechnol Biochem ; 80(7): 1362-7, 2016 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-26979837

RESUMEN

RNA localization is an important event that is essential for the polarization and differentiation of a cell. Although several methods are currently used to detect localized RNAs, a simplified detection system has not yet been developed for Schizosaccharomyces pombe. In the present study, we describe a new vector system for the visualization of localized RNAs in S. pombe using a U1A-tag-GFP system. A pREP1-U1A-tag vector plasmid to express U1A-tagged RNA and a pREP2-U1AGFP plasmid to produce a U1A-GFP fusion protein were constructed for this system. Since the U1A-GFP protein binds U1A-tagged RNA, fluorescence is observed at the location of U1A-tagged RNA in cells expressing both of these. The nucleolar localization of U3 snoRNA was successfully detected using this system, and a novel RNA localized at the DNA region of the nucleus was found by screening localized RNAs. This system will accelerate the study of localized RNAs in S. pombe.


Asunto(s)
Núcleo Celular/genética , Regulación Fúngica de la Expresión Génica , Vectores Genéticos/metabolismo , ARN de Hongos/genética , ARN Nucleolar Pequeño/genética , Schizosaccharomyces/genética , Núcleo Celular/metabolismo , Núcleo Celular/ultraestructura , Expresión Génica , Genes Reporteros , Vectores Genéticos/química , Proteínas Fluorescentes Verdes/genética , Proteínas Fluorescentes Verdes/metabolismo , Imagen Óptica , ARN de Hongos/metabolismo , ARN Nucleolar Pequeño/metabolismo , Proteínas Recombinantes de Fusión/genética , Proteínas Recombinantes de Fusión/metabolismo , Ribonucleoproteína Nuclear Pequeña U1/genética , Ribonucleoproteína Nuclear Pequeña U1/metabolismo , Schizosaccharomyces/metabolismo , Schizosaccharomyces/ultraestructura
5.
Front Genet ; 15: 1460902, 2024.
Artículo en Inglés | MEDLINE | ID: mdl-39296543

RESUMEN

tRNAs have recently gained attention for their novel regulatory roles in translation and for their diverse functions beyond translation. One of the most remarkable aspects of tRNA biogenesis is the incorporation of various chemical modifications, ranging from simple base or ribose methylation to more complex hypermodifications such as formation of queuosine and wybutosine. Some tRNAs are transcribed as intron-containing pre-tRNAs. While the majority of these modifications occur independently of introns, some are catalyzed in an intron-inhibitory manner, and in certain cases, they occur in an intron-dependent manner. This review focuses on pre-tRNA modification, including intron-containing pre-tRNA, in both intron-inhibitory and intron-dependent fashions. Any perturbations in the modification and processing of tRNAs may lead to a range of diseases and disorders, highlighting the importance of understanding these mechanisms in molecular biology and medicine.

6.
Tohoku J Exp Med ; 230(1): 33-42, 2013 05.
Artículo en Inglés | MEDLINE | ID: mdl-23728504

RESUMEN

Nursing students must develop their abilities to provide appropriate nursing services. They need to acquire the level of nursing knowledge to pass the national examination according to Japanese law. Moreover, even if the awareness of the rights of people who receive nursing services increases, students must not have a sense of resistance toward those rights. Therefore, we investigated the factors associated with students' motivation to pass their examination and such a sense of resistance. We produced items related to reasons students wanted to become registered nurses with reference to job satisfaction and their learning environment (e.g., teachers' manners and school events unrelated to the examination). There were 3,417 female nursing students analyzed in 29 vocational schools that allow graduation after a 3-year study period (average age, 21.93 years [standard deviation, 5.44]). Older and third-year students had a stronger motivation to pass the examination and a weaker sense of resistance to people's rights compared with younger and first- to second-year students. Students who answered a "Lack of enthusiasm for becoming a registered nurse" had a weakened motivation and a strengthened sense of resistance. Factors enhancing students' motivation to pass their examination were "Professional commitment," "Desire for companionship," and "School events unrelated to the national examination." Factors strengthening students' sense of resistance to people's rights were "Living stability" and "Social appraisal." Teachers must develop methods to teach ethics so that their students respect the rights of people who receive nursing services and to ensure that they acquire the necessary nursing knowledge.


Asunto(s)
Educación en Enfermería/ética , Conocimientos, Actitudes y Práctica en Salud , Aprendizaje/ética , Motivación/ética , Derechos del Paciente/ética , Estudiantes de Enfermería/psicología , Adolescente , Adulto , Humanos , Persona de Mediana Edad , Adulto Joven
7.
Tohoku J Exp Med ; 231(3): 179-86, 2013 11.
Artículo en Inglés | MEDLINE | ID: mdl-24172685

RESUMEN

Prevention is better than cure. Public health plays an important role in promoting prevent medicine. To obtain the abilities to provide appropriate nursing services, learning public health is necessary for students who want to become registered nurses. When teachers teach public health to nursing students, it is important to motivate them to learn it. Therefore, we investigated the reasons for the lack of motivation to learn public health by conducting a questionnaire survey. The subjects were female nursing students in 29 vocational schools in Kanagawa and Chiba prefectures of Japan that allow graduation after a 3-year study period. We asked the students whether or not they had completed the subject of public health and analyzed those students who answered affirmatively. We analyzed 1,553 respondents whose average age was 22.6 ± 5.2 years (range, 18 to 45). Using factor analysis, we discovered the 5 reasons that lead to the lack of nursing students' motivation to learn public health: "Difficulties acquiring knowledge of public health," "Inappropriate attitudes of public health teachers," "Thinking lightly about the national examination in the field of public health," "Lack of understanding the importance of learning public health," and "Future plans that do not specialize in public health." Using multiple linear regression analysis, these 5 reasons were significant predictors for the lack of students' motivation. Older students also had significantly less motivation to learn public health than did younger students. When teachers instruct their students, they should teach public health better with the present knowledge.


Asunto(s)
Educación en Enfermería , Aprendizaje , Motivación , Salud Pública/educación , Estudiantes de Enfermería/psicología , Adolescente , Adulto , Distribución por Edad , Análisis Factorial , Femenino , Humanos , Japón , Persona de Mediana Edad , Adulto Joven
8.
PLoS One ; 18(12): e0295659, 2023.
Artículo en Inglés | MEDLINE | ID: mdl-38100455

RESUMEN

The Saccharomyces cerevisiae uses a highly glycolytic metabolism, if glucose is available, through appropriately suppressing mitochondrial functions except for some of them such as Fe/S cluster biogenesis. Puf3p, a Pumillio family protein, plays a pivotal role in modulating mitochondrial activity, especially during fermentation, by destabilizing its target mRNAs and/or by repressing their translation. Puf3p preferentially binds to 8-nt conserved binding sequences in the 3'-UTR of nuclear-encoded mitochondrial (nc-mitochondrial) mRNAs, leading to broad effects on gene expression under fermentable conditions. To further explore how Puf3p post-transcriptionally regulates nc-mitochondrial mRNAs in response to cell growth conditions, we initially focused on nc-mitochondrial mRNAs known to be enriched in monosomes in a glucose-rich environment. We unexpectedly found that one of the monosome-enriched mRNAs, CAT5/COQ7 mRNA, directly interacts with Puf3p through its non-canonical Puf3p binding sequence, which is generally less considered as a Puf3p binding site. Western blot analysis showed that Puf3p represses translation of Cat5p, regardless of culture in fermentable or respiratory medium. In vitro binding assay confirmed Puf3p's direct interaction with CAT5 mRNA via this non-canonical Puf3p-binding site. Although cat5 mutants of the non-canonical Puf3p-binding site grow normally, Cat5p expression is altered, indicating that CAT5 mRNA is a bona fide Puf3p target with additional regulatory factors acting through this sequence. Unlike other yeast PUF proteins, Puf3p uniquely regulates Cat5p by destabilizing mRNA and repressing translation, shedding new light on an unknown part of the Puf3p regulatory network. Given that pathological variants of human COQ7 lead to CoQ10 deficiency and yeast cat5Δ can be complemented by hCOQ7, our findings may also offer some insights into clinical aspects of COQ7-related disorders.


Asunto(s)
Proteínas de Saccharomyces cerevisiae , Saccharomycetales , Humanos , Glucosa/metabolismo , ARN Mensajero/genética , ARN Mensajero/metabolismo , Proteínas de Unión al ARN/metabolismo , Saccharomyces cerevisiae/genética , Saccharomyces cerevisiae/metabolismo , Proteínas de Saccharomyces cerevisiae/metabolismo , Saccharomycetales/genética
9.
Genes Cells ; 16(3): 316-29, 2011 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-21323804

RESUMEN

RNA localization is a common mechanism for recruiting proteins to specific regions of a cell, which causes cell polarization and sometimes asymmetric division. We found that EGD1 mRNA accumulates dose-dependently as a cytoplasmic granule in Saccharomyces cerevisiae. EGD1 encodes a ß-subunit of the nascent polypeptide-associated complex (NAC). NAC is a heterodimer consisting of α- and ß-subunits, associated with ribosomes and thought to be involved in the folding of nascent polypeptide chains. Analysis of deletion constructs showed that the localization of EGD1 mRNA requires both an upstream region and an ORF of EGD1, suggesting that the translation of Egd1p is important for localization. We also showed that Egd1p and P-body components are co-localized with EGD1 mRNA. This granule, named the EGD1 granule, has features similar to cellular inclusions containing aggregated proteins. Disruption of microtubules by treatment with a drug, benomyl, resulted in loss of the EGD1 granule. When the expression level of EGD2 encoding the αNAC increased, the percentage of cells showing the EGD1 granule decreased, suggesting that the granular distribution of EGD1 depends on the quantitative balance between α- and ß-subunits of NAC. Taken together, we propose a novel microtubule-dependent mechanism for controlling NAC through RNA localization.


Asunto(s)
Gránulos Citoplasmáticos/metabolismo , Proteínas de Unión al ADN/química , Proteínas de Unión al ADN/genética , Chaperonas Moleculares/metabolismo , Proteínas de Saccharomyces cerevisiae/química , Proteínas de Saccharomyces cerevisiae/genética , Saccharomyces cerevisiae/citología , Saccharomyces cerevisiae/metabolismo , Factores de Transcripción/química , Factores de Transcripción/genética , Citoplasma , Proteínas de Unión al ADN/metabolismo , Microtúbulos/metabolismo , Mutación , ARN Mensajero/análisis , Proteínas de Saccharomyces cerevisiae/metabolismo
10.
Int J Mol Med ; 21(5): 585-92, 2008 May.
Artículo en Inglés | MEDLINE | ID: mdl-18425350

RESUMEN

The thermo-enhancement effects of the sesquiterpene lactone parthenolide (PTL), which targets the transcription factor nuclear factor-kappaB (NF-kappaB), and hyperthermia at 40, 42 and 44 degrees C on the human lung adenocarcinoma A549 cell line were investigated in vitro. Thermotherapy using a combined treatment with PTL (0.02 microM) prior to hyperthermia showed synergistic thermo-enhancement effects towards A549 cells. The expression of p53 and hsp72 proteins following the application of PTL and hyperthermia at 44 degrees C, both alone and in combination, were examined to investigate whether p53 and hsp72 participated in apoptosis induction via the NF-kappaB signal pathway. After treatment with PTL alone, Hsp72 was only slightly induced, which was the same as for the control, while the level following the combination treatment was not significantly different as compared with hyperthermia alone. In addition, the level of p53 after the combination treatment was only slightly increased in comparison with hyperthermia alone. The kinetics of apoptosis and necrosis induction during the incubation periods following PTL exposure and hyperthermia, and the combination of both were also determined. The incidence of apoptosis following hyperthermia alone was approximately 0.6% on average after 12, 24 and 48 h of incubation, while that of PTL alone was approximately 1.7%, and that with the combination treatment was around 2.3%. Thus, induction of apoptosis following the combination treatment was increased as compared to each treatment alone. With regard to the kinetics of necrosis, the incidence of necrosis after treatment with hyperthermia alone was approximately 2.7%, while that with the combination treatment was lower, at around 2.2%. We hypothesized that cells treated with PTL had an altered arrangement of stressed cells undergoing the transformation from necrotic cell death to apoptotic cell death via another mechanism. Our results suggested that the PTL-induced apoptosis of A549 cells was due to the direct suppression of NF-kappaB activity in a p53- and hsp72-independent manner based on NF-kappaB signaling.


Asunto(s)
Apoptosis/fisiología , Línea Celular Tumoral/efectos de los fármacos , Proteínas del Choque Térmico HSP72/metabolismo , Calor , Neoplasias Pulmonares/metabolismo , FN-kappa B/metabolismo , Sesquiterpenos/farmacología , Proteína p53 Supresora de Tumor/metabolismo , Animales , Antineoplásicos/farmacología , Antineoplásicos/uso terapéutico , Proteínas del Choque Térmico HSP72/genética , Humanos , Neoplasias Pulmonares/tratamiento farmacológico , FN-kappa B/genética , Sesquiterpenos/uso terapéutico , Transducción de Señal/fisiología , Proteína p53 Supresora de Tumor/genética
11.
Syst Appl Microbiol ; 30(2): 165-8, 2007 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-16876367

RESUMEN

Intra-species analysis of pulsed field gel electrophoresis (PFGE) on human fecal Bifidobacterium longum isolates revealed that a majority of 12 Japanese subjects harbored strains of unique PFGE types or subtypes over a 68-week period, suggesting that "indigenous"Bifidobacterium strains remain stable for a considerable time in each individual intestinal microbiota.


Asunto(s)
Bifidobacterium/clasificación , Heces/microbiología , Bifidobacterium/aislamiento & purificación , Análisis por Conglomerados , Dermatoglifia del ADN , ADN Bacteriano/genética , Electroforesis en Gel de Campo Pulsado , Genotipo , Humanos , Japón
12.
Ann Thorac Surg ; 104(2): e123-e125, 2017 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-28734431

RESUMEN

A 94-year-old woman with rupture of a thoracic aortic aneurysm (rTAA) was referred to us. She previously underwent thoracic endovascular aortic repair and was considered to be at high risk for a conventional open operation. Therefore an endovascular procedure was planned. The proximal landing zone needed to be placed at the ascending aorta to seal a type 1a endoleak. A hybrid operation consisting of supraaortic total debranching on the common femoral artery and endovascular repair was performed. All debranched bypasses were patent and the aneurysm was excluded. The patient regained sufficient ambulatory strength and showed no symptoms of syncope.


Asunto(s)
Aorta Torácica/cirugía , Aneurisma de la Aorta Torácica/cirugía , Disección Aórtica/cirugía , Prótesis Vascular , Procedimientos Endovasculares/métodos , Arteria Femoral/cirugía , Stents , Anciano de 80 o más Años , Disección Aórtica/diagnóstico , Aneurisma de la Aorta Torácica/diagnóstico , Femenino , Arteria Femoral/diagnóstico por imagen , Humanos , Diseño de Prótesis , Tomografía Computarizada por Rayos X
13.
Gen Thorac Cardiovasc Surg ; 65(10): 598-601, 2017 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-28243894

RESUMEN

Cardiac resynchronization therapy (CRT) has been increasingly performed in patients having heart failure with dyssynchrony. We report a successful case of total thoracoscopic left ventricular (LV) lead implantation in CRT. A 77-year-old man with marked dyssynchrony of the LV wall motion and a low ejection fraction (EF17%) due to pacemaker-mediated cardiomyopathy was referred to us. CRT was planned, but percutaneous LV lead implantation proved difficult owing to anatomical variations. The LV lead was placed in the post-lateral wall of the LV base using a total thoracoscopic procedure. Preoperative dyspnea and dyssynchrony were clearly improved. In CRT, the LV wall stimulation site is important. The LV lead should be implanted in the latest activation area, which can be detected using speckle tracking echocardiography. Surgical lead implantation can be performed in the ideal area, and this procedure may play a new role as a hybrid CRT.


Asunto(s)
Cardiomiopatías/cirugía , Desfibriladores Implantables , Marcapaso Artificial/efectos adversos , Toracoscopía/métodos , Anciano , Bloqueo Atrioventricular/terapia , Cardiomiopatías/diagnóstico , Cardiomiopatías/etiología , Ecocardiografía , Ventrículos Cardíacos , Humanos , Masculino
14.
Int J Mol Med ; 18(5): 909-15, 2006 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-17016621

RESUMEN

The effects of amrubicin (AMR) and its active metabolite, amrubicinol (AMROH), on the sensitivity of human lung adenocarcinoma A549 cells to ionizing radiation were investigated in vitro. Further, the kinetics of apoptosis and necrosis induction were also analyzed. The cytocidal effects of X-ray irradiation on A549 cells resulted in a low level of radiosensitivity with a D0 value of 12 Gy. The slopes of the survival curves in the exponential phase were plotted on semilogarithmic paper for radiation combined with AMR (2.5 microg/ml) and AMROH (0.02 microg/ml) treatment, and were shown to be approximately parallel to treatment with irradiation alone. The initial shoulder-shape portion of the survival curve for radiation alone, indicating the repair of sublethal damage, was reduced as compared to that for sequential combined treatment with AMR or AMROH. Sequential treatments with AMR or AMROH prior to ionizing radiation resulted in an additive radio-enhancement effect that reduced not only survival, but also the shoulder width. Fractionated irradiation with 2 Gy per fraction of A549 cells was carried out in vitro similar to that commonly performed in clinical radiotherapy and the radio-resistance of the cells was shown to be inhibited by AMR and AMROH. Similar to AMR and AMROH, adriamycin and etoposide (VP-16) are DNA topoisomerase II inhibitors. The effects of these 4 agents on cells that received X-ray irradiation were compared and all of the agents exhibited comparable radio-enhancement effects. The induction of apoptosis was investigated at 48 and 72 h after administration of AMROH, radiation or combined treatment, and apoptosis was not significantly induced after any of the treatments. We also examined the induction of necrosis, and found that the incidence of necrosis following combined treatment was approximately 2 times higher than that with either of the single treatments.


Asunto(s)
Adenocarcinoma/radioterapia , Antraciclinas/farmacología , Neoplasias Pulmonares/radioterapia , Tolerancia a Radiación/efectos de los fármacos , Fármacos Sensibilizantes a Radiaciones/farmacología , Inhibidores de Topoisomerasa II , Apoptosis , Línea Celular Tumoral , Humanos , Cinética , Necrosis , Rayos X
15.
Ann Vasc Dis ; 9(3): 235-239, 2016.
Artículo en Inglés | MEDLINE | ID: mdl-27738471

RESUMEN

A thoracic aortic pseudoaneurysm is a life-threatening complication following thoracic aortic surgery. We describe a surgical strategy for this pseudoaneurysm with a high risk for rupture during median sternotomy. The pseudoaneurysm was distended and widely adherent to the posterior sternum. Elective cardiopulmonary bypass and moderate hypothermia were established, and sternotomy was performed without left ventricle distention or brain ischemia. Total arch replacement was successful and the patient was discharged on post operative day (POD) 18. A key surgical strategy was to avoid ventricular fibrillation before sternotomy. Appropriate sternotomy timing and perfusion strategy are crucial for successful treatment.

16.
Ann Vasc Dis ; 9(3): 244-247, 2016.
Artículo en Inglés | MEDLINE | ID: mdl-27738473

RESUMEN

A 43-year-old woman with abdominal and back pain during childbirth consulted us 1 day postdelivery. Contrast-enhanced computed tomography (CT) revealed partially thrombosed type A aortic dissection with intimal tear in the proximal descending thoracic aorta. Conservative antihypertensive treatment was started. However, her abdominal pain progressively deteriorated. Repeat CT revealed narrowing of the descending aorta true lumen and progressive bowel malperfusion. Total arch replacement was urgently performed using the frozen elephant trunk technique. Postoperative CT showed true lumen widening and symptom disappearance. Follow-up CT demonstrated excellent aortic remodeling.

17.
Int J Mol Med ; 16(3): 381-7, 2005 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-16077943

RESUMEN

The effects of amrubicin (AMR) and its active metabolite, amrubicinol (AMROH), on the sensitivity of human lung adenocarcinoma A549 cell line to hyperthermia at 44 degrees C were investigated. The cell phase response as well as the kinetics of apoptosis and necrosis induction were also analyzed. The cytocidal effects of 44 degrees C hyperthermia on A549 cells exhibited low thermosensitivity with a T(0) value of 12 min. The slope of the survival curve in the exponential phase, described semilogarithmically, in 44 degrees C hyperthermia combined treatment with AMROH (0.02 microg/ml) was approximately parallel to 44 degrees C hyperthermia alone. The initial shoulder shape portion of the survival curve from 44 degrees C hyperthermia alone, indicating the repair of sublethal thermal damage (SLTDR), was reduced with the sequential combined treatment of AMR or AMROH. Sequential treatments with AMR or AMROH prior to 44 degrees C hyperthermia resulted in additive thermo-enhancement effect by reducing not only survival but was shoulder wide. Furthermore, like AMR and AMROH, adriamycin (ADM) and etoposide (VP-16) are DNA topoisomerase II inhibitors, and the effects of these 4 agents on 44 degrees C hyperthermia were compared. All 4 agents exhibited comparable thermo-enhancement effects. Using synchronized A549 cells, AMR or AMROH did not elicit cell phase responses, irrespective of the concentration. The induction of apoptosis was investigated at 48 and 72 h after AMROH treatment, 44 degrees C hyperthermia or the combined treatment, in which apoptosis was not significantly induced after any treatment. Furthermore, the incidence of necrosis was examined as well as apoptosis. The incidence of necrosis at 48 and 72 h after AMROH was 2.4 and 4.3%, respectively; after 44 degrees C hyperthermia was 3.3 and 4.0%, respectively; and after the combined treatment it was 10.7 and 8.7%, respectively. The necrosis induced after the combined treatment was circa 3 times higher than that in either of the single treatments.


Asunto(s)
Antraciclinas/farmacología , Apoptosis/efectos de los fármacos , Adenocarcinoma/patología , Adenocarcinoma/fisiopatología , Línea Celular Tumoral , Supervivencia Celular/efectos de los fármacos , Doxorrubicina/farmacología , Sinergismo Farmacológico , Etopósido/farmacología , Calor , Humanos , Neoplasias Pulmonares/patología , Neoplasias Pulmonares/fisiopatología , Necrosis/inducido químicamente , Factores de Tiempo
18.
Shokuhin Eiseigaku Zasshi ; 46(5): 224-7, 2005 10.
Artículo en Inglés | MEDLINE | ID: mdl-16305178

RESUMEN

To validate a modified version of AOAC official method of analysis 995.10 as an official standard in Japan for determination of patulin in apple juice, an inter-laboratory study was performed in 11 laboratories using a non-contaminated sample, 2 naturally contaminated samples and 2 spiked samples of apple juice. For naturally contaminated apple juices, the relative standard deviations for repeatability and reproducibility were 3.2, 7.1% and 10.0, 21.7%, respectively. HORRAT values were 0.4, 0.9. The average recovery of patulin from spiked sample was 83.7%. The limit of quantification was calculated as 10 microg/kg. From these results, the method was thought to be suitable as an official standard for determination of patulin in apple juice in Japan.


Asunto(s)
Malus/química , Patulina/análisis , Cromatografía Líquida de Alta Presión , Análisis de los Alimentos/normas , Japón
19.
Shokuhin Eiseigaku Zasshi ; 56(5): 228-32, 2015.
Artículo en Japonés | MEDLINE | ID: mdl-26537653

RESUMEN

A rapid and simple determination method of seven fungicides, thiabendazole (TBZ), pyrimethanil (PYR), o-phenylphenol (OPP), fludioxonil (FLD), azoxystrobin (AZX), imazalil (IMZ) and diphenyl (DP) in citrus fruits by LC-MS and HPLC-FL was developed. The seven fungicides were extracted with acetonitrile from citrus fruits and cleaned up with Z-Sep/C18 cartridges. The LC separation was performed on a phenyl-hexyl column with methanol-acetonitrile-10 mmol/L ammonium formate (10 : 35 : 55) as a mobile phase. The recoveries from citrus fruits fortified with the compounds at the MRLs and at 0.1 µg/g ranged from 85.4 to 106.3% and from 75.8 to 99.7%, respectively. The quantitation limits (S/N=10) were 0.03-0.07 µg/g.


Asunto(s)
Cromatografía Líquida de Alta Presión/métodos , Citrus/química , Análisis de los Alimentos/métodos , Contaminación de Alimentos/análisis , Fungicidas Industriales/análisis , Espectrometría de Masas/métodos , Espectrometría de Fluorescencia/métodos
20.
CEN Case Rep ; 4(2): 135-138, 2015 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-28509087

RESUMEN

We report the case of an 80-year-old woman with postoperative congestive heart failure (CHF) complicated by Child-Pugh classification B liver cirrhosis and hepatic edema successfully treated with tolvaptan. The patient suffered from liver cirrhosis and underwent partial hepatectomy for a hepatocellular carcinoma diagnosed together with a severe aortic valve stenosis. Aortic valve replacement was performed under cardiopulmonary bypass. The postoperative course was uneventful until CHF and hepatic edema symptoms appeared on postoperative day (POD) 2. The symptoms were treated with intravenous human atrial natriuretic peptide and oral diuretics. As the condition showed no improvement, oral tolvaptan was administered on POD 11 and thereafter, which markedly improved the symptoms. This is apparently the first report describing the effectiveness of tolvaptan for the postoperative management of fluid balance in a patient with cardiac and liver dysfunction.

SELECCIÓN DE REFERENCIAS
DETALLE DE LA BÚSQUEDA