RESUMEN
BACKGROUND AND PURPOSE: Although stroke patients with diabetes mellitus have a poor prognosis, the prognostic factors of patients with diabetes mellitus have not been adequately studied. The aim of this study was to determine the predisposing factors for outcome 1â year after stroke in diabetic patients. METHODS: Patients' characteristics, findings on admission and outcome 1â year after first ischaemic stroke were prospectively investigated in 452 consecutive patients with diabetes mellitus (305 males, 147 females; 69â ±â 10â years old). A poor outcome was defined as a modified Rankin Scale (mRS) score ≥â 2, 1â year after stroke onset. RESULTS: There were 286 patients with a good outcome (mRS score ≤â 1) and 166 with a poor outcome (mRS score ≥â 2). On multivariate logistic regression analysis, age [odds ratio (OR) 1.06, 95% confidence interval (CI) 1.03-1.10, Pâ <â 0.001, per 1-year increase], National Institutes of Health Stroke Scale (NIHSS) score on admission (OR 1.21, 95% CI 1.11-1.32, Pâ <â 0.001, per 1-point increase), diabetic nephropathy (OR 1.93, 95% CI 1.02-3.65, Pâ =â 0.044) and hemoglobin A1c (HbA1c; OR 1.27, 95% CI 1.07-1.51, Pâ =â 0.007, per 1% increase) were independently related to poor outcome (mRS score ≥â 2) 1â year after the onset of the first stroke in diabetic patients. CONCLUSIONS: In stroke patients with diabetes mellitus, age, NIHSS score on admission, diabetic nephropathy and HbA1c were independently associated with a poor outcome 1â year after the first ischaemic stroke.
Asunto(s)
Diabetes Mellitus/diagnóstico , Diabetes Mellitus/epidemiología , Sistema de Registros , Accidente Cerebrovascular/diagnóstico , Accidente Cerebrovascular/epidemiología , Anciano , Anciano de 80 o más Años , Diabetes Mellitus/terapia , Femenino , Estudios de Seguimiento , Humanos , Japón/epidemiología , Masculino , Persona de Mediana Edad , Estudios Prospectivos , Factores de Riesgo , Accidente Cerebrovascular/terapia , Resultado del TratamientoRESUMEN
BACKGROUND: Mantle cell lymphoma (MCL) is an aggressive B-cell lymphoma with poor prognosis, requiring novel anticancer strategies. METHODS: Mantle cell lymphoma cell lines with known p53 status were treated with GUT-70, a tricyclic coumarin derived from Calophyllum brasiliense, and the biological and biochemical consequences of GUT-70 were studied. RESULTS: GUT-70 markedly reduced cell proliferation/viability through G(1) cell cycle arrest and increased apoptosis, with greater sensitivity in mutant (mt)-p53-expressing MCL cells than in wild-type (wt)-p53-bearing cells. Mechanistically, GUT-70 showed binding affinity to heat-shock protein 90 (Hsp90) and ubiquitin-dependent proteasomal degradation of Hsp90 client proteins, including cyclin D1, Raf-1, Akt, and mt-p53. Depletion of constitutively overexpressed cyclin D1 by GUT-70 was accompanied by p27 accumulation and decreased Rb phosphorylation. GUT-70 induced mitochondrial apoptosis with Noxa upregulation and Mcl-1 downregulation in mt-p53 cells, but Mcl-1 accumulation in wt-p53 cells. Noxa and Mcl-1 were coimmunoprecipitated, and activated BAK. Treatment with a combination of GUT-70 and bortezomib or doxorubicin had synergistic antiproliferative effects in MCL cells that were independent of p53 status. CONCLUSION: GUT-70 has pronounced antiproliferative effects in MCL with mt-p53, a known negative prognostic factor for MCL, through Hsp90 inhibition. These findings suggest that GUT-70 has potential utility for the treatment of MCL.
Asunto(s)
Apoptosis/efectos de los fármacos , Proliferación Celular/efectos de los fármacos , Cumarinas/farmacología , Proteínas HSP90 de Choque Térmico/antagonistas & inhibidores , Linfoma de Células del Manto/tratamiento farmacológico , Antineoplásicos/uso terapéutico , Western Blotting , Ácidos Borónicos/uso terapéutico , Bortezomib , Ciclo Celular/efectos de los fármacos , Ciclina D1/genética , Ciclina D1/metabolismo , Sinergismo Farmacológico , Quimioterapia Combinada , Citometría de Flujo , Proteínas HSP90 de Choque Térmico/genética , Proteínas HSP90 de Choque Térmico/metabolismo , Humanos , Técnicas para Inmunoenzimas , Inmunoprecipitación , Linfoma de Células del Manto/metabolismo , Linfoma de Células del Manto/patología , Mutación/genética , Proteína Oncogénica v-akt/genética , Proteína Oncogénica v-akt/metabolismo , Proteínas Proto-Oncogénicas c-bcl-2/genética , Proteínas Proto-Oncogénicas c-bcl-2/metabolismo , Proteínas Proto-Oncogénicas c-raf/genética , Proteínas Proto-Oncogénicas c-raf/metabolismo , Pirazinas/uso terapéutico , ARN Mensajero/genética , Reacción en Cadena de la Polimerasa de Transcriptasa Inversa , Células Tumorales Cultivadas , Proteína p53 Supresora de Tumor/genética , Proteína p53 Supresora de Tumor/metabolismo , Proteína Destructora del Antagonista Homólogo bcl-2/genética , Proteína Destructora del Antagonista Homólogo bcl-2/metabolismoRESUMEN
Bcr-Abl tyrosine kinase (TK) inhibitors are promising therapeutic agents for Bcr-Abl-positive (Bcr-Abl(+)) leukemias. Although they are known to promote caspase-mediated apoptosis, it remains unclear whether caspase-independent cell death-inducing mechanisms are also triggered. Here we demonstrated that INNO-406, a second-generation Bcr-Abl TK inhibitor, induces programmed cell death (PCD) in chronic myelogenous leukemia (CML) cell lines through both caspase-mediated and caspase-independent pathways. The latter pathways include caspase-independent apoptosis (CIA) and necrosis-like cell death (CIND), and the cell lines varied regarding which mechanism was elicited upon INNO-406 treatment. We also observed that the propensity toward CIA or CIND in cells was strongly associated with cellular dependency on apoptosome-mediated caspase activity. Cells that undergo CIND have a high apoptosome activity potential whereas cells that undergo CIA tend to have a lower potential. Moreover, we found that INNO-406 promotes autophagy. When autophagy was inhibited with chloroquine or gene knockdown of beclin1 by shRNA, INNO-406-induced cell death was enhanced, which indicates that the autophagic response of the tumor cells is protective. These findings suggest new insights into the biology and therapy of Bcr-Abl(+) leukemias.
Asunto(s)
Autofagia/efectos de los fármacos , Proteínas de Fusión bcr-abl/antagonistas & inhibidores , Leucemia Mielógena Crónica BCR-ABL Positiva/enzimología , Leucemia Mielógena Crónica BCR-ABL Positiva/patología , Inhibidores de Proteínas Quinasas/farmacología , Pirimidinas/farmacología , Animales , Apoptosomas/efectos de los fármacos , Apoptosomas/metabolismo , Caspasas/metabolismo , Línea Celular Tumoral , Cloroquina/farmacología , Citoprotección/efectos de los fármacos , Modelos Animales de Enfermedad , Activación Enzimática/efectos de los fármacos , Masculino , Ratones , Ratones SCID , Ensayos Antitumor por Modelo de XenoinjertoRESUMEN
The biogeochemistry of hypersaline environments is strongly influenced by changes in biological processes and physicochemical parameters. Although massive evaporation events have occurred repeatedly throughout Earth history, their biogeochemical cycles and global impact remain poorly understood. Here, we provide the first nitrogen isotopic data for nutrients and chloropigments from modern shallow hypersaline environments (solar salterns, Trapani, Italy) and apply the obtained insights to δ15N signatures of the Messinian salinity crisis (MSC) in the late Miocene. Concentrations and δ15N of chlorophyll a, bacteriochlorophyll a, nitrate, and ammonium in benthic microbial mats indicate that inhibition of nitrification suppresses denitrification and anammox, resulting in efficient ammonium recycling within the mats and high primary productivity. We also suggest that the release of 15N-depleted NH3(gas) with increasing salinity enriches ammonium 15N in surface brine (≈34.0). Such elevated δ15N is also recorded in geoporphyrins isolated from sediments of the MSC peak (≈20), reflecting ammonium supply sufficient for sustaining phototrophic primary production. We propose that efficient nutrient supply combined with frequent bottom-water anoxia and capping of organic-rich sediments by evaporites of the Mediterranean MSC could have contributed to atmospheric CO2 reduction during the late Miocene.
RESUMEN
Bcr-Abl is the cause of Philadelphia-positive (Ph(+)) leukemias and also constitutes their principal therapeutic target, as exemplified by dramatic effects of imatinib mesylate. However, mono-targeting of Bcr-Abl does not always achieve complete leukemia eradication, and additional strategies those enable complete elimination of leukemic cells are desired to develop. Here we demonstrate that INNO-406, a much more active Bcr-Abl tyrosine kinase inhibitor than imatinib, augments the activities of several proapoptotic Bcl-2 homology (BH)3-only proteins (Bim, Bad, Bmf and Bik) and induces apoptosis in Ph(+) leukemia cells via Bcl-2 family-regulated intrinsic apoptosis pathway. ABT-737, an inhibitor of antiapoptotic Bcl-2 and Bcl-X(L), greatly enhanced the apoptosis by INNO-406, even in INNO-406-less sensitive cells with Bcr-Abl point mutations except T315I mutation. In contrast, co-treatment with INNO-406 and other pharmacologic inducers of those BH3-only proteins, such as 17-allylaminogeldanamycin, an heat shock protein-90 inhibitor, or PS-341, a proteasome inhibitor, did not further increase the BH3-only protein levels or sensitize leukemic cells to INNO-406-induced apoptosis, suggesting a limit to how much expression levels of BH3-only proteins can be increased by anticancer agents. Thus, double-barrelled molecular targeting for Bcr-Abl-driven oncogenic signaling and the cell protection by antiapoptotic Bcl-2 family proteins may be the rational therapeutic approach for eradicating Ph(+) leukemic cells.
Asunto(s)
Antineoplásicos/farmacología , Compuestos de Bifenilo/farmacología , Leucemia Mielógena Crónica BCR-ABL Positiva/metabolismo , Nitrofenoles/farmacología , Piperazinas/farmacología , Proteínas Proto-Oncogénicas c-bcl-2/metabolismo , Pirimidinas/farmacología , Sulfonamidas/farmacología , Animales , Antineoplásicos/metabolismo , Apoptosis/fisiología , Benzamidas , Benzoquinonas/farmacología , Compuestos de Bifenilo/metabolismo , Ácidos Borónicos/metabolismo , Ácidos Borónicos/farmacología , Bortezomib , Línea Celular Transformada , Línea Celular Tumoral , Humanos , Mesilato de Imatinib , Lactamas Macrocíclicas/farmacología , Leucemia Mielógena Crónica BCR-ABL Positiva/tratamiento farmacológico , Leucemia Mielógena Crónica BCR-ABL Positiva/patología , Ratones , Nitrofenoles/metabolismo , Piperazinas/metabolismo , Proteínas Proto-Oncogénicas c-bcl-2/antagonistas & inhibidores , Proteínas Proto-Oncogénicas c-bcr/metabolismo , Pirazinas/metabolismo , Pirazinas/farmacología , Pirimidinas/metabolismo , Sulfonamidas/metabolismoRESUMEN
BACKGROUND AND PURPOSE: Sorbin and SH3-domain-containing-1 (SORBS1) is an important adaptor protein in insulin-signalling pathway, and its genetic polymorphism may regulate the activity of insulin resistance. We investigated the association between the SORBS1 T228A polymorphism and ischaemic stroke. METHODS: Genotyping was achieved by a rapid-cycle PCR and melting curve analysis using fluorescent probes in 1049 incident cases of ischaemic stroke and 1049 age- and sex-matched control subjects recruited from the Hisayama study. RESULTS: The allele distributions of the SORBS1 T228A polymorphism were similar amongst cases and controls. The multivariate-adjusted odds ratio (OR) of the AA genotype for ischaemic stroke was 2.897 (95% CI, 0.907-8.018) compared with the TT genotype. In terms of stroke subtype, there was a trend toward a difference in the AA genotypes for lacunar infarction, compared with the TT genotype (OR = 8.740, P = 0.0510), and combined TT and TA genotypes (OR = 8.768, P = 0.0505). The other polymorphisms genotyped were not associated with any subtypes of ischaemic stroke. T228A polymorphism of SORBS1 was not associated with the prevalence of diabetes. CONCLUSIONS: The AA genotype of SORBS1 T228A polymorphism may play a role in lacunar infarction in the Japanese population.
Asunto(s)
Infarto Encefálico/epidemiología , Infarto Encefálico/genética , Predisposición Genética a la Enfermedad , Proteínas de Microfilamentos/genética , Polimorfismo Genético , Anciano , Infarto Encefálico/clasificación , Estudios de Casos y Controles , Estudios de Cohortes , Femenino , Frecuencia de los Genes , Genotipo , Humanos , Japón/epidemiología , Japón/etnología , Masculino , Persona de Mediana Edad , Oportunidad Relativa , Sistema de Registros , Estudios Retrospectivos , Riesgo , Factores de RiesgoRESUMEN
The C242T polymorphism of p22phox, a component of NAD(P)H oxidase, may have an impact on cardiovascular diseases; however, the association between this polymorphism and brain infarction is not fully understood. Here, we investigate the relationship between the C242T polymorphism and brain infarction in Japan. We recruited 1055 patients with brain infarction and 1055 control subjects. A chi-squared test revealed that the T-allele frequency was lower in patients with cardioembolic infarction (5.6%) than in control subjects (11.0%, P < 0.001); however, allele frequencies in patients with lacunar and atherothrombotic infarction (11.2%) were not significantly different from those in control subjects (11.0%). A multivariate-adjusted conditional logistic regression analysis also revealed no association between CT + TT genotype, and lacunar and atherothrombotic infarction (odds ratio = 0.97, 95% confidence interval: 0.72-1.32). To investigate the functional effects of the C242T polymorphism, we examined superoxide production in COS-7 cells cotransfected with Nox4 and p22phox of each genotype. The superoxide-producing activity in those cells expressing p22phox with the T allele was not significantly different from that in cells expressing p22phox with the C allele. The present results suggest that the p22phox C242T polymorphism may have a protective effect against cardioembolic infarction, but is not related to lacunar and atherothrombotic infarction in Japan.
Asunto(s)
Isquemia Encefálica/enzimología , Isquemia Encefálica/genética , NADPH Oxidasas/genética , Polimorfismo Genético/genética , Sistema de Registros , Accidente Cerebrovascular/enzimología , Accidente Cerebrovascular/genética , Anciano , Anciano de 80 o más Años , Animales , Isquemia Encefálica/epidemiología , Células COS , Infarto Cerebral/enzimología , Infarto Cerebral/epidemiología , Infarto Cerebral/genética , Chlorocebus aethiops , Femenino , Frecuencia de los Genes/genética , Humanos , Japón/epidemiología , Masculino , Persona de Mediana Edad , Accidente Cerebrovascular/epidemiologíaRESUMEN
We report a 19-year-old woman with Behcet's disease who suffered a subarachnoid hemorrhage and had bilateral peripheral middle cerebral artery aneurysms. After steroid therapy for 3 days, the smaller aneurysm disappeared. The larger aneurysm was excised and the artery reconstructed using a superficial temporary artery graft. Histological examination showed vasculitis restricted to the wall of the aneurysm. This is the first report of arterial reconstruction for an aneurysm associated with Behcet's disease. Steroid therapy before the operation may facilitate repair of the arterial wall.
Asunto(s)
Síndrome de Behçet/cirugía , Aneurisma Intracraneal/cirugía , Hemorragia Subaracnoidea/cirugía , Adulto , Antiinflamatorios/administración & dosificación , Arterias/trasplante , Síndrome de Behçet/diagnóstico , Síndrome de Behçet/patología , Angiografía Cerebral , Femenino , Humanos , Infusiones Intravenosas , Aneurisma Intracraneal/diagnóstico , Aneurisma Intracraneal/patología , Imagen por Resonancia Magnética , Metilprednisolona/administración & dosificación , Arteria Cerebral Media/patología , Arteria Cerebral Media/cirugía , Premedicación , Hemorragia Subaracnoidea/diagnóstico , Hemorragia Subaracnoidea/patologíaRESUMEN
Therapy-related acute myeloid leukemia and myelodysplastic syndrome (t-AML/MDS) represent severe late effects in patients receiving hematopoietic cell transplantation (HCT) for lymphoma. The choice between high-dose therapy with autologous HCT and allogeneic HCT with reduced-intensity conditioning remains controversial in patients with relapsed lymphoma. We retrospectively analyzed incidence and risk factors for the development of t-AML/MDS in lymphoma patients treated with autologous or allogeneic HCT. A total of 13 810 lymphoma patients who received autologous (n=9963) or allogeneic (n=3847) HCT between 1985 and 2012 were considered. At a median overall survival (OS) of 52 and 46 months in autologous and allogeneic HCT groups, respectively, lymphoma patients receiving autologous HCT (1.38% at 3 years after autologous HCT) had a significant risk for developing t-AML/MDS compared to allogeneic HCT (0.37% at 3 years after allogeneic HCT, P<0.001). Significant risk factors for the development of t-AML/MDS after autologous and allogeneic HCT were high-stage risk at HCT (P=0.04) or secondary malignancies (P<0.001) and receiving cord blood stem cell (P=0.03) or involved field radiotherapy (P=0.002), respectively. Strategies that carefully select lymphoma patients for autologous HCT, by excluding lymphoma patients with high-stage risk at HCT, may allow the identification of individual lymphoma patients at particular high risk for t-AML/MDS.
Asunto(s)
Trasplante de Células Madre Hematopoyéticas , Leucemia Mieloide Aguda/epidemiología , Linfoma/epidemiología , Linfoma/terapia , Síndromes Mielodisplásicos/epidemiología , Neoplasias Primarias Secundarias/epidemiología , Adolescente , Adulto , Anciano , Anciano de 80 o más Años , Aloinjertos , Autoinjertos , Femenino , Estudios de Seguimiento , Humanos , Masculino , Persona de Mediana Edad , Factores de RiesgoRESUMEN
We analyzed serial changes in the regional cerebral blood flow (rCBF) of 13 patients with intracerebral hemorrhage by single photon emission computed tomography (SPECT) during the acute- to chronic stage (2 hr to 55 weeks). The (99m)Tc-ethyl cysteinate dimmer ((99m)Tc-ECD) was used as the nuclear mediator. The SPECT timing within 48 hours after the onset was considered to be acute stage, from 48 hours to 4 weeks to be subacute stage, and after 4 weeks to be chronic stage. The region of interest was each hemisphere in the whole brain without ventricles at the thalamic level. For semi-quantitative analysis of rCBF, we used the Brain Uptake Ratio method. Of the 13 patients (mean age 65.5 years), 3 had thalamic-, 4 putaminal-, 5 subcortical-, and one a cerebellar hemorrhage; the hematoma volume varied from 4-50 ml (<20 ml, n=9; 20-30 ml, n=1; >30 ml, n=3; mean 17 ml). The rCBF changes during the long-term follow-up were classified as increase-, decrease-, and unchanged type. Of 5 patients with increased rCBF, 4 made a good recovery and one was severely disabled; of 5 patients with decreased rCBF, 1 made a good recovery, 3 were moderately-, and one was severely disabled. All 3 patients with unchanged rCBF were moderately disabled. Our findings suggest that among patients with hypertensive intracerebral hemorrhage, those with increased rCBF over time may have a favorable outcome. We further need more cases with intracerebral hemorrhage to clarify this trend.
Asunto(s)
Hemorragia Cerebral/diagnóstico por imagen , Hemorragia Cerebral/fisiopatología , Circulación Cerebrovascular/fisiología , Hipertensión/complicaciones , Anciano , Anciano de 80 o más Años , Encéfalo/diagnóstico por imagen , Encéfalo/fisiopatología , Hemorragia Cerebral/etiología , Femenino , Estudios de Seguimiento , Lateralidad Funcional , Humanos , Masculino , Persona de Mediana Edad , Recuperación de la Función , Tomografía Computarizada de Emisión de Fotón ÚnicoRESUMEN
We report the application of matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) for the accurate measurement of mass of low molecular weight compounds (smaller than 1500 Da), a linear peptide, two types of cyclic depsipeptides, a polyhydroxy-macrocyclic lactone, and two prenylated flavonoids, with delayed extraction in the reflector mode. The performance of the MALDI-TOF instrument was less than those of fast atom bombardment and Fourier-transform ion cyclotron resonance mass spectrometry instruments and insufficient to give acceptable accuracy for literature reporting. Nevertheless, when combined with NMR spectrometry and/or amino acid analysis to give information on the numbers of carbon atoms and index of hydrogen deficiency, MALDI was useful for determination of the elemental composition of the low molecular weight compounds available in small quantities.
Asunto(s)
Proteínas Bacterianas , Depsipéptidos , Espectrometría de Masa por Láser de Matriz Asistida de Ionización Desorción/métodos , Angiotensina II/análisis , Antibacterianos/análisis , Antifúngicos/análisis , Antineoplásicos Fitogénicos/análisis , Medicamentos Herbarios Chinos/análisis , Flavonoides/análisis , Lactonas/análisis , Peso Molecular , Oligopéptidos/análisis , Péptidos Cíclicos/análisisRESUMEN
The neutralization of Japanese encephalitis virus (JEV) was studied using JEV-specific neutralizing (NT) monoclonal antibody (MAb) 503 that recognizes the envelope glycoprotein. Analysis using radiolabeled JEV and observations by confocal laser microscopy and electron microscopy indicated that the NT and protection activities of MAb 503 did not result from the prevention of the first step of JEV infection, binding of virus to the cell surface. Treatment with MAb 503 strongly inhibited JEV-induced cell fusion and internalization of JEV into the cells, and resulted in enhanced release of JEV-RNA from the cells. These observations suggested that the NT activity of MAb 503 is involved in the later steps of JEV infection.
Asunto(s)
Anticuerpos Monoclonales/inmunología , Virus de la Encefalitis Japonesa (Especie)/inmunología , Glicoproteínas/inmunología , Proteínas Virales/inmunología , Adsorción , Animales , Anticuerpos Antivirales/inmunología , Fusión Celular/inmunología , Chlorocebus aethiops , Virus de la Encefalitis Japonesa (Especie)/metabolismo , Virus de la Encefalitis Japonesa (Especie)/ultraestructura , Endocitosis , Microscopía Confocal , Microscopía Electrónica , Pruebas de Neutralización , ARN Viral/química , ARN Viral/metabolismo , Ribonucleasas/metabolismo , Tripsina/farmacología , Células Vero , Virión/inmunología , Virión/metabolismo , Virión/ultraestructuraRESUMEN
Cerebral cortical cells from fetal rats (14 days) were cultured in vitro (7-104 days). Localization of synaptophysin was examined immunocytochemically using a monoclonal antibody (SY-38) against synaptophysin. Synaptophysin-immunoreactive (SP-IR) spots were distributed on the surface of the cells. Electron-microscopic observation showed that the SP-IR staining was localized at presynaptic terminals, indicating that the SP-IR spots observed will, fluorescence microscopy represent presynaptic terminals. The time-course of the distribution of SP-IR spots was examined. SP-IR spots could not be observed in cells at 7 days in vitro (DIV). At 14 DIV, SP-IR spots could be first observed on the surface of cell bodies and neurites. Thereafter, the density of SP-IR spots on the cell bodies and neurites increased with DIV. At 42 and 104 DIV, SP-IR spots were almost continued, surrounding the neurites and cell bodies of the cultured cells. These immunocytochemical studies suggest that the dissociated 14-day fetal cerebral cortical neurons make synapses by at least 14 DIV and that the density of synapses increases with time.
Asunto(s)
Corteza Cerebral/metabolismo , Neuronas/metabolismo , Sinapsis/fisiología , Sinaptofisina/biosíntesis , Animales , Anticuerpos Monoclonales , Células Cultivadas , Corteza Cerebral/citología , Femenino , Inmunohistoquímica , Neuronas/fisiología , Embarazo , Ratas , Sinaptofisina/inmunologíaRESUMEN
The characteristics shown in the electrospray ionization/ion trap mass spectra of ring-opened LI-F antibiotics (cyclic depsihexapeptides with a 15-guanidino-3-hydroxypentadecanoic group as a side-chain) were examined. Collision-induced dissociation (CID) MS of protonated molecules of the depsipeptides produced many fragment ions. Most of these fragment ions contained information for determining the amino acid sequences of antifungal antibiotics. The fragment ions were classified into six groups (b(n'), B(n'), B'(n'), beta(n'), y(n) and Y(n)). According to MS(3) spectra, the B(n'), B'(n) and beta(n) ions can be considered to be derived with a cleavage at each CO--NH in the peptide bonds of [MH--NH(3)](+),[MH--NH(3)--OH](+) and [MH--NH(3)--2H(2)O](+), respectively, in ion trap MS. Losses of NH(3) and H(2)O from the amino acid residues of the depsipeptides in ion trap MS are likely to be smaller than those from the side-chain. The measurements with electrospray ionization (ESI)/ion trap MS of depsipeptides with a side chain containing polar groups may provide useful information for structural determination.
Asunto(s)
Antibacterianos/química , Antifúngicos/química , Péptidos Cíclicos/química , Espectrometría de Masa por Ionización de Electrospray , Bacillus/química , Ciclización , ProtonesRESUMEN
A rapid sensitive and specific reverse passive haemagglutination test (RPHA) was developed for the detection of Japanese encephalitis virus (JEV) antigens in human cerebrospinal fluid (CSF). Sheep red cells were sensitized with five monoclonal antibodies (109, 112, 203, 204 and 301) reactive with envelope glycoprotein of JEV. Viral antigens were detected in CSF from 35 of 58 (60%) clinical cases of JE when the five MAb coated cells were used in combination. An IgM capture ELISA detected JEV specific antibodies in CSF among 52 of these 58 cases (90%). While 29 specimens contained both antigen and IgM antibodies, 23 had only IgM antibodies and 6 had only antigen. RPHA proved valuable for detection of viral antigens in CSF samples obtained within 10 days after onset of clinical symptoms. Amongst the five MAbs used, the individual antigen detection rates were 44, 12, 43, 12 and 36%, for MAbs 109, 112, 203, 204 and 301, respectively.
Asunto(s)
Antígenos Virales/líquido cefalorraquídeo , Virus de la Encefalitis Japonesa (Especie)/aislamiento & purificación , Pruebas de Hemaglutinación/métodos , Proteínas del Envoltorio Viral/análisis , Animales , Anticuerpos Monoclonales/inmunología , Anticuerpos Antivirales/análisis , Antígenos Virales/inmunología , Células Cultivadas , Virus de la Encefalitis Japonesa (Especie)/inmunología , Encefalitis Japonesa/diagnóstico , Encefalitis Japonesa/inmunología , Ensayo de Inmunoadsorción Enzimática , Humanos , Inmunoglobulina M/análisis , Inmunoglobulina M/inmunología , Pruebas de Sensibilidad Microbiana , OvinosRESUMEN
Pancreatic acinar cells within the islets of Langerhans in human pancreas were investigated both histopathologically and electron microscopically. Acinar cells inside the islets of Langerhans were observed in all 50 adult cases investigated. Between such acinar cells and endocrine tissues, no reticular fiber was observed; they were encapsulated together instead. The acinar cells were immunostained with antiamylase similar to the "extrainsular" acinar cells and were also connected to the small pancreatic duct. Electron microscopically, intercellular junctions of the desmosomal type were found between the acinar cells and the adjacent endocrine cells. Therefore, the acinar cells within the islets of Langerhans were true acinar cells, based on the incomplete demarcation between the islets and the acinar tissue.
Asunto(s)
Islotes Pancreáticos/citología , Adulto , Humanos , Microscopía Electrónica , Estudios RetrospectivosRESUMEN
Only 12 myelodysplastic syndrome (MDS) cases with Behçet's syndrome have been previously reported and trisomy 8 was found to have accumulated in all these patients. Five of the cases had complications in the form of multiple intestinal ulcers, which is one of the symptoms of Behçet's syndrome. To investigate the relationship between trisomy 8 and multiple intestinal ulcers in MDS patients, we analyzed 46 MDS cases treated in our hospital over the last decade, and trisomy 8 was observed in eight of them. Three of these cases had complications of both multiple intestinal ulcers and thrombosis, and two cases showed episodes of thrombosis without intestinal ulcers. All these five cases featured trisomy 8, while the other 38 MDS patients without trisomy 8 had no episode of either intestinal ulcer or thrombosis. Two of the three cases suffering from multiple intestinal ulcers were treated with granulocyte-colony stimulating factor (G-CSF), which resulted in aggravation of the symptoms. Although the influence of G-CSF on such symptoms in MDS patients with trisomy 8 remains unclear, it seems advisable to exercise caution in the use of G-CSF when an MDS patient with trisomy 8 has intestinal ulcers or thrombosis.
Asunto(s)
Cromosomas Humanos Par 8/genética , Síndromes Mielodisplásicos/complicaciones , Síndromes Mielodisplásicos/genética , Trisomía , Adulto , Anciano , Anciano de 80 o más Años , Síndrome de Behçet/etiología , Síndrome de Behçet/genética , Contraindicaciones , Análisis Citogenético , Femenino , Factor Estimulante de Colonias de Granulocitos/administración & dosificación , Factor Estimulante de Colonias de Granulocitos/efectos adversos , Humanos , Masculino , Persona de Mediana Edad , Síndromes Mielodisplásicos/diagnóstico , Úlcera Péptica/etiología , Úlcera Péptica/genética , Factores de Riesgo , Trombosis/etiología , Trombosis/genéticaRESUMEN
Brain edema was produced by injecting triethyltin (TET) into the right cerebral hemisphere via the internal carotid artery in rats. TET induced a dose-related increase in mortality rate and brain water content. Immediately after TET-injection (2 mg/head), saline, glycerol (125 mg/ml) or the N-methyl-D-aspartate receptor antagonist (R)-4-(3-Phosphono-2-propenyl)-2-piperazine carboxylic acid (D-CPP-ene; 0.083 and 0.25 mg/ml) was continually infused via the right internal jugular vein at 20 microliters/min for 6 h. The mortality rate and brain water content were significantly decreased after infusion of 0.25 mg/ml D-CPP-ene, but only somewhat reduced after glycerol infusion when compared with the saline group. The results suggest that continual intravenous posttreatment with D-CPP-ene is useful for treatment of brain edema.
Asunto(s)
Edema Encefálico/metabolismo , Piperazinas/farmacología , Receptores de N-Metil-D-Aspartato/antagonistas & inhibidores , Animales , Agua Corporal/metabolismo , Encéfalo/efectos de los fármacos , Encéfalo/metabolismo , Edema Encefálico/inducido químicamente , Edema Encefálico/mortalidad , Arteria Carótida Interna , Relación Dosis-Respuesta a Droga , Antagonistas de Aminoácidos Excitadores/farmacología , Infusiones Intravenosas , Inyecciones Intraarteriales , Inyecciones Intravenosas , Masculino , Ratas , Ratas Endogámicas F344 , Análisis de Supervivencia , Compuestos de Trietilestaño/administración & dosificaciónRESUMEN
Six new phenol (anthraquinone or stilbene) glycosides with an acyl group at 6-position of the glucopyranose moiety were isolated from rhubarb (the roots of Rheum palmatum) cultivated in Japan, together with 22 known compounds. Most of these compounds were evaluated for cytotoxic activity against tumor and normal cells and for induction of DNA damage by spore rec-assay. Among them, emodin and aloe-emodin showed higher cytotoxic activities against human oral squamous cell carcinoma (HSC-2) and salivary gland tumor (HSG) cell lines than against normal human gingival fibroblasts (HGF). Chrysophanol 8-O-beta-(6'-acetyl)glucopyranoside, 4-(4'-hydroxyphenyl)-2-butanone 4'-O-beta-D-(2"-O-galloyl-6"-O-cinnamoyl) glucopyranoside, and 6"-O-(4'''-hydroxybenzoyl) resveratroloside exhibited relatively higher cytotoxic activities against all these cells. The other glycosides of anthraquinone or stilbene showed weaker cytotoxic activity against these tumor cell lines, but may be considered as cancer chemopreventive agents. Spore rec-assay with a recombination deficient mutant of Bacillus subtilis M45 demonstrated the DNA damage-inducing activity of emodin and aloe-emodin 15-O-beta-D-glucopyranoside among, rhubarb phenols.
Asunto(s)
Daño del ADN , Fenoles/aislamiento & purificación , Fenoles/toxicidad , Rheum/química , Bacillus subtilis/efectos de los fármacos , Carcinoma de Células Escamosas/tratamiento farmacológico , Ensayos de Selección de Medicamentos Antitumorales , Glicósidos/aislamiento & purificación , Glicósidos/toxicidad , Humanos , Pruebas de Sensibilidad Microbiana , Peso Molecular , Neoplasias de la Boca/tratamiento farmacológico , Extractos Vegetales/química , Extractos Vegetales/aislamiento & purificación , Raíces de Plantas/química , Células Tumorales CultivadasRESUMEN
In the South Arcot district, an area endemic for Japanese encephalitis in Tamil Nadu, Culex tritaeniorhynchus Giles, Culex vishnui Theobald, Culex gelidus Theobald and Culex fuscocephala Theobald constituted 93.6% of 422,621 adult females representing 27 culicine species collected between August 1991 and July 1994. Vector abundance was lowest in the hot and dry season (April-June) and highest in the cool and wet season (October-December). Overall, 285,531 adult female mosquitoes (5,710 pools) were tested for virus using an enzyme-linked immunosorbent assay or by inoculation into larvae of Toxorhynchites splendens Wiedemann and identification by immunofluorescent test using JE virus specific monoclonal antibody or by both. In total, 91 isolations were made, of which 80 (88%) were identified as JE virus; 58 isolations were from Cx. tritaeniorhynchus, 22 from Cx. vishnui, 6 from Cx. fuscocephala and 5 from Cx. gelidus, giving similar minimum infection rates (MIR) of 0.28, 0.41, 0.39, and 0.52, respectively. Vector abundance and MIR increased from July concurrently with the initiation of rice cultivation. MIR peaked in September followed by a decrease in October, but mosquitoes remained abundant until March. The decrease in MIR from October onward coincided with rising herd immunity in pigs. Although MIRs in October (0.47) and November (0.42) were lower than in September (0.92), a comparable high risk of infection for humans continued because of high vector abundance and human biting rates. In the South Arcot district, the probability of a child receiving an infective bite was 0.53 per JE transmission season.