RESUMEN
BACKGROUND AND STUDY AIMS: The aim of the current study was to assess the detection rate of the right adrenal gland and the diagnostic ability of endoscopic ultrasound (EUS) and fine-needle aspiration (FNA) for the diagnosis of adrenal metastasis in potentially resectable lung cancer. PATIENTS AND METHODS: This retrospective cohort study included a consecutive series of 150 patients undergoing EUS/EUS - FNA for staging of lung cancer. The detection rate of the right adrenal gland by EUS and the diagnostic accuracies of computed tomography (CT), positron emission tomography-CT (PET-CT), and EUS/EUS - FNA for the diagnosis of adrenal metastasis were evaluated. RESULTS: The right adrenal gland was visualized by EUS in 131 patients (87.3 %); the left adrenal gland was visualized in all patients. Findings suggestive of metastasis in either one of the adrenal glands or in both were observed in 6 patients (4.0 %) by CT, in 5 patients (3.3 %) by PET-CT, and in 11 patients (7.3 %) by EUS. EUS - FNA was performed simultaneously in the 11 patients, and in 4 patients the diagnosis of metastasis was established. The accuracy for the diagnosis of adrenal metastasis was 100 % for EUS/EUS - FNA, 96.0 % for CT, and 97.0 % for PET-CT (P = 0.1146). CONCLUSIONS: As well as the left adrenal gland, the right adrenal gland was also usually visible by EUS. EUS/EUS - FNA provided an accurate diagnosis of adrenal metastasis, although the prevalence of adrenal metastasis was relatively low in these patients with potentially resectable lung cancer.
Asunto(s)
Adenocarcinoma/diagnóstico , Neoplasias de las Glándulas Suprarrenales/diagnóstico , Glándulas Suprarrenales/patología , Biopsia por Aspiración con Aguja Fina Guiada por Ultrasonido Endoscópico , Neoplasias Pulmonares/patología , Carcinoma Pulmonar de Células Pequeñas/diagnóstico , Adenocarcinoma/secundario , Neoplasias de las Glándulas Suprarrenales/secundario , Glándulas Suprarrenales/diagnóstico por imagen , Adulto , Anciano , Anciano de 80 o más Años , Endosonografía , Femenino , Humanos , Neoplasias Pulmonares/cirugía , Masculino , Persona de Mediana Edad , Imagen Multimodal , Tomografía de Emisión de Positrones , Cuidados Preoperatorios , Estudios Retrospectivos , Carcinoma Pulmonar de Células Pequeñas/secundario , Tomografía Computarizada por Rayos XRESUMEN
BACKGROUND: Recently, transesophageal endoscopic ultrasound-guided fine-needle aspiration (EUS-FNA) has been evaluated for mediastinal nodal staging (N staging) of lung cancer, as this technique is less invasive than mediastinoscopy and possibly more accurate than 18F-fluorodeoxyglucose positron emission tomography with computed tomography (PET-CT). However, EUS-FNA does not provide access to pretracheal and hilar lymph nodes. More recently, endobronchial ultrasound-guided transbronchial needle aspiration (EBUS-TBNA) has been introduced as a novel technique for accessing pretracheal and hilar lymph nodes. Although the combined endoscopic approach of EUS-FNA and EBUS-TBNA is presumably more accurate than PET-CT, only a few reports have quantitatively evaluated its diagnostic ability. Therefore, we prospectively assessed the diagnostic yield of this combined endoscopic approach for mediastinal N staging of lung cancer. METHODS: A consecutive series of 120 patients with suspected resectable lung cancer on CT findings underwent PET-CT and combined EUS-FNA/EBUS-TBNA. The accuracy and other diagnostic indices of the combined approach in mediastinal N staging were compared with those of PET-CT. RESULTS: Among the enrolled patients, a final pathological N stage was established in 110 patients. The accuracy of the combined approach using EUS-FNA and EBUS-TBNA was significantly higher than that of PET-CT (90.0 % vs. 73.6 %; P < 0.0001). The sensitivity, specificity, and positive and negative predictive values were respectively 71.8 %, 100 %, 100 %, and 86.6 % for the combined approach vs. 47.4 %, 87.5 %, 66.7 %, and 75.9â% for PET-CT. CONCLUSIONS: The combined endoscopic approach using EUS-FNA and EBUS-TBNA provided excellent diagnostic performance. Therefore, this approach is strongly recommended before surgery or mediastinoscopy to avoid futile thoracotomy and surgical intervention.
Asunto(s)
Biopsia con Aguja Fina , Broncoscopía , Endosonografía , Neoplasias Pulmonares/patología , Ganglios Linfáticos/patología , Ultrasonografía Intervencional , Adulto , Anciano , Anciano de 80 o más Años , Biopsia con Aguja Fina/métodos , Femenino , Humanos , Neoplasias Pulmonares/diagnóstico por imagen , Metástasis Linfática , Masculino , Mediastino , Persona de Mediana Edad , Imagen Multimodal , Estadificación de Neoplasias , Tomografía de Emisión de Positrones , Sensibilidad y Especificidad , Tomografía Computarizada por Rayos XRESUMEN
Peptidoglycan hydrolase, LytF (CwlE), was determined to be identical to YhdD (deduced cell wall binding protein) by zymography after insertional inactivation of the yhdD gene. YhdD exhibits high sequence similarity with CwlF (PapQ, LytE) and p60 of Listeria monocytogenes. The N-terminal region of YhdD has a signal sequence followed by five tandem repeated regions containing polyserine residues. The C-terminal region corresponds to the catalytic domain, because a truncated protein without the N-terminal region retained cell wall hydrolase activity. The histidine-tagged LytF protein produced in Escherichia coli cells hydrolyzed the linkage of D-gamma-glutamyl-meso-diaminopimelic acid in murein peptides, indicating that it is a D,L-endopeptidase. Northern hybridization and primer extension analyses indicated that the lytF gene was transcribed by EsigmaD RNA polymerase. Disruption of lytF led to slightly filamentous cells, and a lytF cwlF double mutant exhibited extraordinary microfiber formation, which is similar to the cell morphology of the cwlF sigD mutant.
Asunto(s)
Bacillus subtilis/crecimiento & desarrollo , Proteínas Bacterianas , Endopeptidasas/metabolismo , N-Acetil Muramoil-L-Alanina Amidasa/metabolismo , Secuencia de Aminoácidos , Bacillus subtilis/enzimología , Bacillus subtilis/genética , Bacillus subtilis/metabolismo , Secuencia de Bases , Dominio Catalítico/genética , División Celular , Pared Celular/enzimología , Endopeptidasas/química , Endopeptidasas/genética , Endopeptidasas/aislamiento & purificación , Escherichia coli/genética , Genes Bacterianos/genética , Hidrólisis , Datos de Secuencia Molecular , Peso Molecular , Ácidos Murámicos/metabolismo , Mutagénesis Insercional , N-Acetil Muramoil-L-Alanina Amidasa/química , N-Acetil Muramoil-L-Alanina Amidasa/genética , N-Acetil Muramoil-L-Alanina Amidasa/aislamiento & purificación , Fenotipo , ARN Mensajero/análisis , ARN Mensajero/metabolismo , Proteínas Recombinantes de Fusión/biosíntesis , Proteínas Recombinantes de Fusión/aislamiento & purificación , Proteínas Recombinantes de Fusión/metabolismo , Secuencias Repetitivas de Aminoácido/genética , Homología de Secuencia de Aminoácido , Especificidad por SustratoRESUMEN
Bacillus subtilis produces a 35-kDa cell wall hydrolase, CwlF, during vegetative growth. The CwlF protein was extracted from B. subtilis cwlB sigD mutant cells and separated by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. N-terminal amino acid sequencing revealed that its sequence is completely identical to that of the internal region of the papQ gene product. Disruption of the papQ gene in the B. subtilis chromosome led to the complete loss of CwlF, indicating that papQ is identical to cwlF. CwlF exhibits high sequence similarity to the p60 proteins of Listeria species, NlpC proteins of Escherichia coli and Haemophilus influenzae, and Enp2 protein of Bacillus sphaericus. The beta-galactosidase activity of the cwlF-lacZ transcriptional fusion and Northern blot analysis of the cwlF gene indicated that the gene is expressed as a monocistronic operon during the exponential growth phase, and primer extension analysis suggested that the cwlF gene is transcribed mainly by EsigmaA RNA polymerase and weakly by EsigmaH RNA polymerase. While the cells of the cwlF-deficient mutant were about twice as long as those of the wild-type strain, the cwlF sigD double mutant cells exhibited extraordinary microfiber formation, in contrast to the filamentation of the sigD mutant. The CwlF production was not affected by the pleiotropic mutations flaD1 and degU32(Hy), which endow cells with the ability of extensive filamentation.
Asunto(s)
Bacillus subtilis/citología , Bacillus subtilis/genética , Proteínas Bacterianas , Pared Celular/metabolismo , Regulación Bacteriana de la Expresión Génica , N-Acetil Muramoil-L-Alanina Amidasa/genética , Secuencia de Aminoácidos , Bacillus subtilis/enzimología , Secuencia de Bases , División Celular/genética , Flagelina/genética , Datos de Secuencia Molecular , N-Acetil Muramoil-L-Alanina Amidasa/metabolismo , ARN Bacteriano/genética , ARN Mensajero/genética , Homología de Secuencia de Aminoácido , Especificidad de la EspecieRESUMEN
The V beta repertoire of T cells of patients with gram-positive group A streptococcal (GAS) and non-GAS infections was analyzed to seek evidence for the role of superantigens in streptococcal toxic shock syndrome. No evidence of V beta overexpression but a consistent pattern of depletion of V beta 1, V beta 5.1, and V beta 12 was observed in patients with severe GAS infections. This pattern of V beta depletion was not observed in patients with nonsevere GAS infections or with severe non-GAS gram-positive infections. T cells from patients with severe GAS infections showed evidence of apoptosis; no apoptosis was found when there was no evidence of V beta depletion. There was no correlation with streptococcal M or T serotype or known spe genes. The depletion of specific V beta-bearing T cells in patients with severe GAS infections supports the role of a superantigen in these infections. The in vivo pattern of V beta specificity implicates a novel superantigen(s) in this disease.
Asunto(s)
Antígenos Bacterianos , Proteínas de la Membrana Bacteriana Externa , Proteínas Portadoras , Proteínas de la Membrana , Receptores de Antígenos de Linfocitos T alfa-beta/análisis , Choque Séptico/inmunología , Infecciones Estreptocócicas/inmunología , Streptococcus pyogenes/inmunología , Superantígenos/inmunología , Linfocitos T/inmunología , Adolescente , Adulto , Anciano , Apoptosis , Proteínas Bacterianas/análisis , Secuencia de Bases , Estudios de Casos y Controles , Exotoxinas/biosíntesis , Exotoxinas/genética , Femenino , Humanos , Masculino , Persona de Mediana Edad , Datos de Secuencia Molecular , Choque Séptico/microbiología , Infecciones Estreptocócicas/microbiología , Streptococcus pyogenes/clasificación , Streptococcus pyogenes/genética , Linfocitos T/patologíaRESUMEN
The M protein of Streptococcus pyogenes plays a major role in the virulence of these bacteria. Members of the M protein superfamily are characterized by the presence of tandem segments of repeated amino acid sequences. The NH2-terminal end of the M proteins is a hypervariable region that harbors the type-specific epitopes of the molecule. Pepsin cleaves the molecule into a highly conserved carboxyl terminal half and a variable amino terminal portion referred to as pep M. In some individuals, infection with certain serotypes of group A streptococci is followed by autoimmune disorders such as rheumatic fever and acute glomerulonephritis. The serotypes of M protein that show a high degree of association with acute rheumatic fever are referred to as rheumatogenic serotypes. We have reported that one such serotype, type 5, is a superantigen to human T cells, specifically stimulating T cells bearing V beta 2, V beta 4, and V beta 8 elements. Here we extend our studies by examining other rheumatogenic serotypes for superantigenic properties. Studies with types 6, 18, 19, and 24 M proteins revealed that they are all superantigens to human T cells. The specificity to V beta 4 was shared by the rheumatogenic M proteins tested; however, each pep M serotype has its unique characteristic set of V beta specificity and these are distinct from those reported for the streptococcal pyrogenic exotoxins. The non-rheumatogenic serotype, pep M2, only stimulated V beta 2-bearing T cells. This study establishes that the structurally related M proteins represent a family of streptococcal superantigens analogous to the structurally related family of staphylococcal enterotoxin superantigens.
Asunto(s)
Antígenos Bacterianos , Proteínas de la Membrana Bacteriana Externa , Proteínas Bacterianas/inmunología , Proteínas Portadoras , Proteínas de la Membrana , Receptores de Antígenos de Linfocitos T alfa-beta/fisiología , Fiebre Reumática/etiología , Streptococcus/inmunología , Superantígenos/inmunología , Secuencia de Aminoácidos , Secuencia de Bases , Exotoxinas/inmunología , Humanos , Activación de Linfocitos , Datos de Secuencia Molecular , Receptores de Antígenos de Linfocitos T alfa-beta/genética , Sensibilidad y Especificidad , Alineación de Secuencia , Linfocitos T/inmunologíaRESUMEN
Superantigens interact with specific V beta elements of the T cell receptor and consequently activate all T cells bearing those elements. The ability of superantigens to stimulate T cells depends on the presence of APC that express MHC class II molecules on their surface. The question we are addressing is: do superantigens have to be seen in context of MHC class II molecules, or can they be recognized directly by T cell-receptor elements? We have previously shown that the APC requirement for the stimulation of T cells by the streptococcal superantigen, pep M5, can be bypassed by the addition of PMA and cytokines or by crosslinking CD28 molecules. Here we asked if the response of APC-depleted T cells to this superantigen is V beta-restricted and whether in the presence of PMA and cytokines the specificity of pep M5 to V beta elements is altered. We provide evidence that in the absence of APC, but in the presence of PMA and cytokines, the specificity of pep M5 to V beta elements is identical to that observed when APC are present, with V beta 2, V beta 4, and V beta 8 being significantly expanded. In addition, we ruled out the possibility that the response is due to a minor contamination with APC or to the expression of DR molecules on T cells because anti-HLA class II monoclonal antibodies did not block the reconstituted response, whereas they totally abrogated the response in the presence of APC. We conclude that pep M5 does not have to complex with MHC class II molecules in order to interact with specific V beta elements. In addition, we propose that the inhibitory effects of the anti-class II antibodies when APC are present may be due to preventing pep M5 from binding and activating APC, thereby blocking the production of costimulatory molecules necessary for T cell activation by this superantigen.
Asunto(s)
Células Presentadoras de Antígenos/inmunología , Proteínas de la Membrana Bacteriana Externa , Proteínas Portadoras , Antígenos HLA-D/inmunología , Receptores de Antígenos de Linfocitos T alfa-beta/inmunología , Superantígenos/inmunología , Adulto , Anticuerpos Monoclonales , Antígenos Bacterianos/inmunología , Proteínas Bacterianas/inmunología , Citometría de Flujo , Humanos , Técnicas In Vitro , Reacción en Cadena de la PolimerasaAsunto(s)
Transformación Celular Neoplásica/efectos de los fármacos , Genes ras , Polisacáridos/farmacología , Animales , Línea Celular Transformada/efectos de los fármacos , Transformación Celular Neoplásica/genética , Fibroblastos/citología , Fibroblastos/efectos de los fármacos , Peso Molecular , Polisacáridos/química , Ratas , Transducción de SeñalRESUMEN
Effects of lisuride, a derivative of ergot alkaloid, on central 5-HT1A receptors were investigated biochemically, behaviorally and electroencephalographically (EEG) in rats and rabbits. Effects of lisuride in water-lick conflict tests were also investigated in rats. Lisuride was found to strongly inhibit the bindings of [3H]8-OH-DPAT to 5-HT1A receptors in the raphe nucleus, hippocampus, cortex, amygdala and hypothalamus of rat brain. Inhibitory effects of lisuride on bindings of [3H]8-OH-DPAT in the hippocampus was almost the same as that of 5-HT (Ki = 0.5 nM) and stronger than those of the 5-HT agonist 5-MeO-DMT (Ki = 2.1 nM) or other ergot derivatives (bromocriptine and pergolide, Ki = 3.0 nM). Lisuride (0.1-0.5 mg/kg, i.p.), like 8-OH-DPAT, dose-dependently induced a 5-HT behavioral syndrome in rats. Lisuride affected locomotor activity in rats, whereas 8-OH-DPAT did not. In hippocampal EEG of rabbits, lisuride (0.01-0.03 mg/kg, i.v.), like 8-OH-DPAT and diazepam, dose-dependently inhibited rhythmical slow activity (RSA) induced by acoustical stimulation (3100 Hz) and also inhibited the RSA increased by administration of anxiogenic FG7142. In water-lick conflict tests, lisuride (0.05-0.1 mg/kg, i.p.), like diazepam, increased the number of shocks. These findings indicated that lisuride acts as a strong agonist on central 5-HT1A receptors and suggested that lisuride might be a potential anxiolytic.
Asunto(s)
Ansiolíticos/farmacología , Encéfalo/efectos de los fármacos , Lisurida/farmacología , Receptores de Serotonina/efectos de los fármacos , Animales , Electroencefalografía/efectos de los fármacos , Técnicas In Vitro , Locomoción/efectos de los fármacos , Masculino , Conejos , Ratas , Ratas EndogámicasRESUMEN
The effect of polyamines on F1-ATPase catalyzed reactions has been studied through the use of submitochondrial particles and F1-ATPase. ATP degradation catalyzed by submitochondrial particles and F1-ATPase was inhibited by spermine and spermidine. Spermine's inhibition was much greater than spermidine's effect. In contrast, P1-ATP exchange and succinate dependent ATP synthesis catalyzed by submitochondrial particles were both stimulated by spermine. The inhibition of ATPase activity by polyamines probably occurs through polyamine's replacement of Mg2+ on ATP, for the following reasons. (a) The ATPase activity inhibited by spermine was partially recovered when Mg2+ was added. (b) Spermine bound to ATP and phospholipids but not to F1-ATPase; yet spermine inhibited the ATPase reaction catalyzed by F1-ATPase, a protein free of phospholipid. (c) The binding of spermine to ATP was inhibited by Mg2+. The ATP content in polyamine-deficient cells definitely was lower than that in normal cells. On the basis of these results, the possible role of spermine in keeping the ATP concentration at a high level is discussed.
Asunto(s)
Poliaminas Biogénicas/farmacología , Mitocondrias Hepáticas/enzimología , ATPasas de Translocación de Protón/metabolismo , Adenosina Difosfato/metabolismo , Adenosina Trifosfato/biosíntesis , Animales , Poliaminas Biogénicas/metabolismo , Células Cultivadas , Técnicas In Vitro , Cinética , Mitocondrias Hepáticas/efectos de los fármacos , NADH NADPH Oxidorreductasas/metabolismo , Fosfolípidos/metabolismo , Radioisótopos de Fósforo , Ratas , Espermina/metabolismo , Partículas Submitocóndricas/metabolismoRESUMEN
We have isolated a novel cytotoxic factor from the submandibular glands of male BALB/c mice by Sephadex G-50 gel filtration chromatography and reverse-phase HPLC. The cytotoxic factor is a serine proteinase, which belongs to the mouse glandular kallikrein (mGK) family, with an Mr of approximately 27,000. The purified serine proteinase showed cytotoxic activity against mouse thymocytes in a dose-dependent manner, and a serine proteinase inhibitor, diisopropyl fluorophosphate, blocked its cytotoxic activity.
Asunto(s)
Serina Endopeptidasas/aislamiento & purificación , Glándula Submandibular/enzimología , Animales , Células Cultivadas , Isoflurofato/farmacología , Masculino , Ratones , Ratones Endogámicos BALB C , Fluoruro de Fenilmetilsulfonilo/farmacología , Serina Endopeptidasas/toxicidad , Inhibidores de Serina Proteinasa , Linfocitos T/efectos de los fármacosRESUMEN
We found that extracts of Japanese green tea leaves inhibited the growth of various bacteria causing diarrheal diseases. All tea samples tested showed antibacterial activity against Staphylococcus aureus, S. epidermidis, Vibrio cholerae O1, V. cholerae non O1. V. parahaemolyticus, V. mimicus, Campylobacter jejuni and Plesiomonas shigelloides. None of the tea samples had any effect on the growth of V. fluvialis, Aeromonas sobria, A. hydrophila, Pseudomonas aeruginosa, Salmonella enteritidis, enteroinvasive Escherichia coli, enterohemorrhagic E. coli, enteropathogenic E. coli, enterotoxigenic E. coli, Enterobacter cloacae or Yersinia enterocolitica. Salmonella and Shigella showed susceptibilities different depending on the kind of Japanese green tea. Japanese green tea showed also bactericidal activity over S. aureus, V. parahaemolyticus and even enteropathogenic E. coli which was not sensitive when tested by cup method. The bactericidal activity was shown even at the drinking concentration in daily life.
Asunto(s)
Bacterias/efectos de los fármacos , Extractos Vegetales/farmacología , Té , Bacterias/crecimiento & desarrollo , Farmacorresistencia Microbiana , Escherichia coli/efectos de los fármacos , Staphylococcus aureus/efectos de los fármacos , Té/análisis , Vibrio parahaemolyticus/efectos de los fármacosAsunto(s)
Estro , Vagina/fisiología , Animales , Femenino , Cobayas , Microscopía Electrónica de Rastreo , Vagina/ultraestructuraRESUMEN
The authors investigated the immunohistochemical localization of S-100 protein in normal human brain and glioblastoma tissues by the peroxidase anti-peroxidase method of Sternberger. In normal human brain the positive immunoperoxidase reaction for S-100 protein was observed in astrocytes, oligodendrocytes, ependymal cells, Bergmann's glial cells and epithelial cells of choroid plexus. No positive staining was revealed in any cortical neurons. Immunoelectron-microscopically, the electron dense positive reaction for S-100 protein was seen throughout the cytoplasm, nucleoplasm and cell processes of astrocyte as well as oligodendrocyte. The positive reaction for S-100 protein was demonstrated occasionally in association with cytoplasmic membrane or the membrane constituting cell organelles. We suspect that this observation indicates the existence of membrane-bound form of S-100 protein. In glioblastoma cells, the positive reaction for S-100 protein was relatively weak in intensity as compared with astrocytes, and the degree of positive staining varied from cell to cell. Subcellular localization of S-100 protein in glioblastoma seemed to be essentially similar to that of normal astrocyte. There are some recent reports concerning immunohistochemical localization of alpha and beta subunits of S-100 protein. As compared with these reports, the present immunohistochemical results indicate that the rabbit anti-S-100 antibody embloyed in the present study is mainly against beta subunit of S-100 protein. Although there have been many reports concerning immunohistochemical localization of S-100 protein, the biological role of S-100 protein is still speculative. Some hypotheses are advocated in connection with the possible biological role of S-100 protein. For example, the modulation of synaptic transmission by S-100 protein, the participation of S-100 protein in hormonal secretion and in transport of cations through lipid membrane, the activation of protein kinase and the promotion of disassembly of microtubules by S-100 protein are postulated. It is hard to assume the biological role of S-100 protein based on the immunohistochemical results alone. The present study clearly indicates that S-100 protein exists widely in the cytoplasm, nucleoplasm, cytoplasmic membrane, outer membranes of cell organelles and cell processes of glial cells as well as glioblastoma cells. From these results we assume that S-100 protein plays an important role of intracellular transport of cations as one of the calcium binding proteins.
Asunto(s)
Química Encefálica , Neoplasias Encefálicas/análisis , Glioma/análisis , Proteínas S100/análisis , Encéfalo/inmunología , Encéfalo/ultraestructura , Neoplasias Encefálicas/inmunología , Neoplasias Encefálicas/patología , Glioma/inmunología , Glioma/patología , Histocitoquímica , Humanos , Técnicas para Inmunoenzimas , Proteínas S100/inmunologíaRESUMEN
The effect of methylglyoxal bis(guanylhydrazone) (MGBG), a structural analog of polyamines, on protein synthesis has been studied in the presence and absence of spermidine. The spermidine stimulation of polyphenylalanine- and MS2 RNA-directed RNA replicase synthesis in an Escherichia coli cell-free system and of globin synthesis in a rabbit reticulocyte cell-free system disappeared with the addition of MGBG. The spermidine reduction of misincorporation of leucine during polyphenylalanine synthesis in both E. coli and wheat germ cell-free systems was also disturbed by MGBG. MGBG noncompetitively interfered with polyamine stimulation of polyphenylalanine and globin synthesis, suggesting that MGBG could bind to both RNA and the complex of RNA and polyamine. MGBG was preferentially bound to ribosomal RNA among ribosomal RNA, poly(U), and calf thymus DNA, and strongly inhibited the amount of polyamine bound to ribosomal RNA. These results suggest that MGBG elimination of polyamine effects on protein synthesis may occur through the disturbance of polyamine binding to ribosomal RNA.
Asunto(s)
Mitoguazona/farmacología , Proteínas/metabolismo , Espermidina/metabolismo , Animales , Sistema Libre de Células , ADN/metabolismo , Escherichia coli , Cinética , Péptidos/metabolismo , Poli U/metabolismo , ARN/metabolismo , ARN Ribosómico/metabolismo , ARN Polimerasa Dependiente del ARN/biosíntesis , Conejos , Espermina/metabolismoRESUMEN
A retrospective analysis of 21 cases of primary central nervous system (CNS) lymphoma is reported. All patients presented with a solitary mass in the supratentorial region. None had previously received immunosuppressive therapy. Neuroradiological studies included technetium-99m-pertechnetate brain scanning in eight cases, cerebral arteriography in all 21 cases, and computerized tomography (CT) in 14 cases. The characteristic features were increased uptake in brain scans, mass effect in arteriograms, and marked contrast enhancement on CT scans. Abnormal tumor vessels were occasionally seen on arteriography, and subtraction films were usually required to appreciate tumor stain. All patients underwent craniotomy, and histological studies of the tumors showed a diffuse type of lymphoma in all cases. Immunoglobulin testing was performed in 19 cases and a monoclonal spike was verified in 10, suggesting a B cell origin. All patients were followed until their death except one who was still alive 12 months from onset of symptoms. Therapy included subtotal resection in all 21 cases, whole-brain irradiation in six cases, chemotherapy in two cases, and a combination of whole-brain irradiation and chemotherapy in nine cases. Three different forms of chemotherapy were used. The results suggest that chemotherapy is an important addition to subtotal resection and whole-brain irradiation in the treatment of primary CNS lymphoma.
Asunto(s)
Neoplasias Encefálicas/terapia , Linfoma/terapia , Adulto , Anciano , Protocolos de Quimioterapia Combinada Antineoplásica/uso terapéutico , Neoplasias Encefálicas/diagnóstico , Neoplasias Encefálicas/tratamiento farmacológico , Neoplasias Encefálicas/inmunología , Neoplasias Encefálicas/radioterapia , Neoplasias Encefálicas/cirugía , Preescolar , Craneotomía , Ciclofosfamida/uso terapéutico , Doxorrubicina/uso terapéutico , Femenino , Humanos , Inmunoglobulina G/análisis , Inmunoglobulina M/análisis , Linfoma/diagnóstico , Linfoma/tratamiento farmacológico , Linfoma/inmunología , Linfoma/radioterapia , Linfoma/cirugía , Masculino , Persona de Mediana Edad , Nimustina , Compuestos de Nitrosourea/uso terapéutico , Prednisona/uso terapéutico , Estudios Retrospectivos , Tomografía Computarizada por Rayos X , Vincristina/uso terapéuticoRESUMEN
The possibility that polyamines can stimulate the in vivo synthesis of beta beta' subunits of RNA polymerase has been examined through the use of a polyamine-requiring mutant of Escherichia coli. Results from autoradiographic estimation and activity measurement of RNA polymerase in cell extracts prepared from polyamine starved and unstarved bacteria showed that polyamines stimulate the synthesis of beta beta' subunits of RNA polymerase 2- to 3.6-fold.
Asunto(s)
ARN Polimerasas Dirigidas por ADN/biosíntesis , Poliaminas/fisiología , ADN Viral/metabolismo , Electroforesis en Gel de Poliacrilamida , Escherichia coli/enzimología , Fluorometría , Sustancias Macromoleculares , Putrescina/farmacología , Rifampin/farmacología , Fagos T/genéticaRESUMEN
Both calmodulin and S-100 protein are Ca2+-binding proteins of the EF-hand family. Immunocytochemical study revealed that calmodulin existed mainly in the neurons, whereas S-100 protein was localized primarily in the glial cells of the cerebral and cerebellar cortices of man and monkey. The observed reverse cellular distribution of calmodulin to S-100 protein in primate brain suggests that calmodulin might be replaced in its role as a Ca2+-binding protein by S-100 protein in the glial cells.