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1.
Eur J Clin Microbiol Infect Dis ; 39(4): 749-751, 2020 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-31858355

RESUMO

Community-acquired pneumonia (CAP) is one of the major causes of morbidity, mortality and hospitalization, and S. pneumoniae is the most frequently isolated etiologic agent. The pneumococcal urinary antigen test (PUAT) is among the recommended methods to identify the causative agent in CAP patients. A novel PUAT (IMMUNOCATCHTMStreptococcus pneumoniae) was compared with the Uni-GoldTMS. pneumoniae assay routinely used in our laboratory and with the widely used BinaxNOW® S. pneumoniae antigen card. A total of 218 (183 freshly harvested and 35 frozen) urine samples (US) submitted for the detection of pneumococcal urinary antigen (PUAT) between December 2016 and November 2018 were evaluated. A number of 160 negative and 41 positive concordant results were scored for all the three assays. A total of 17 US gave discrepant results. The sensitivity and specificity of Immunocatch compared with Uni-Gold were 73.2% and 98.8%, respectively, and compared with BinaxNOW were 97.6% and 98.8%, respectively. The overall percent agreement (OPA) and the Cohen's kappa coefficient between the Immunocatch and the Uni-Gold resulted 92.2% and 0.78%, respectively, and compared with BinaxNOW were 98.6% and 0.95%, respectively. These performances suggest that the novel Immunocatch S. pneumoniae test is a useful tool for qualitative detection of S. pneumoniae capsular antigen in US.


Assuntos
Antígenos de Bactérias/urina , Técnicas de Laboratório Clínico/normas , Pneumonia Pneumocócica/diagnóstico , Pneumonia Pneumocócica/urina , Kit de Reagentes para Diagnóstico/normas , Técnicas de Laboratório Clínico/métodos , Infecções Comunitárias Adquiridas/diagnóstico , Infecções Comunitárias Adquiridas/microbiologia , Infecções Comunitárias Adquiridas/urina , Humanos , Sensibilidade e Especificidade , Streptococcus pneumoniae
2.
J Clin Microbiol ; 57(8)2019 08.
Artigo em Inglês | MEDLINE | ID: mdl-31092595

RESUMO

Legionnaires' disease (LD) refers to a serious form of acute pneumonia caused by Legionella species. LD can be difficult to diagnose because the signs and symptoms are nonspecific, and therefore a rapid laboratory diagnosis is of paramount importance. In this study, a recently introduced immunochromatographic test (Immunocatch Legionella; Eiken Chemical Co., Ltd.) for Legionella pneumophila (serogroup 1) urinary antigen detection was compared with the Sofia Legionella fluorescent immunoassay (FIA) (Quidel) (routinely used in our laboratory) and with the widely used BinaxNOW Legionella assay (Alere). A total of 248 urine samples (60 frozen and 188 fresh) were evaluated. All of the samples were collected from patients with high clinical suspicion of Legionnaires' disease. The three assays were performed simultaneously according to the manufacturers' instructions. A total of 180 concordant negative and 66 concordant positive results were obtained. Only 2 discrepant results were registered. The sensitivity and specificity of Immunocatch compared with Sofia were, respectively, 98.5% and 99.4%. Cohen's kappa coefficient and overall percent agreement between Immunocatch and Sofia were also calculated and resulted in, respectively, 0.97 and 99.2%. These performances suggest that the Immunocatch test is a useful tool for Legionella pneumophila (serogroup 1) urinary antigen detection.


Assuntos
Antígenos de Bactérias/urina , Imunofluorescência , Imunoensaio/normas , Doença dos Legionários/diagnóstico , Doença dos Legionários/urina , Antígenos de Bactérias/imunologia , Infecções Comunitárias Adquiridas/diagnóstico , Infecções Comunitárias Adquiridas/microbiologia , Infecções Comunitárias Adquiridas/urina , Humanos , Imunoensaio/métodos , Legionella pneumophila/imunologia , Sensibilidade e Especificidade , Sorogrupo
3.
J Neurophysiol ; 117(4): 1831-1840, 2017 04 01.
Artigo em Inglês | MEDLINE | ID: mdl-28228584

RESUMO

This study tested the hypothesis that high cardiorespiratory fitness (peak oxygen uptake) preserves the cortical circuitry associated with cardiac arousal during exercise in middle- to older-aged individuals. Observations of changes in heart rate (HR) and in cortical blood oxygenation level-dependent (BOLD) images were made in 52 healthy, active individuals (45-73 yr; 16 women, 36 men) across a range of fitness (26-66 ml·kg-1·min-1). Seven repeated bouts of isometric handgrip (IHG) at 40% maximal voluntary contraction force were performed with functional magnetic resonance imaging at 3 T, with each contraction lasting 20 s and separated by 40 s of rest. HR responses to IHG showed high variability across individuals. Linear regression revealed that cardiorespiratory fitness was not a strong predictor of the HR response (r2 = 0.09). In a region-of-interest analysis both the IHG task and the HR time course correlated with increased cortical activation in the bilateral insula and decreased activation relative to baseline in the anterior and posterior cingulate and medial prefrontal cortex (MPFC). t-Test results revealed greater deactivation at the MPFC with higher fitness levels beyond that of guideline-based activity. Therefore, whereas high cardiorespiratory fitness failed to affect absolute HR responses to IHG in this age range, a select effect was observed in cortical regions known to be associated with cardiovascular arousal.NEW & NOTEWORTHY Our first observation suggests that fitness does not strongly predict the heart rate (HR) response to a volitional handgrip task in middle- to older-aged adults. Second, the BOLD response associated with the handgrip task, and with the HR time course, was associated with response patterns in the cortical autonomic network. Finally, whereas high cardiorespiratory fitness failed to affect absolute HR responses to isometric handgrip in this age range, a select effect was observed in cortical regions known to be associated with cardiovascular arousal, beyond that achieved through healthy active living.


Assuntos
Encéfalo/diagnóstico por imagem , Encéfalo/fisiologia , Aptidão Cardiorrespiratória/fisiologia , Exercício Físico/fisiologia , Frequência Cardíaca/fisiologia , Idoso , Pressão Sanguínea/fisiologia , Mapeamento Encefálico , Eletrocardiografia , Teste de Esforço , Feminino , Força da Mão , Humanos , Processamento de Imagem Assistida por Computador , Modelos Lineares , Imageamento por Ressonância Magnética , Masculino , Pessoa de Meia-Idade , Oxigênio/sangue , Volição/fisiologia
4.
Am J Physiol Regul Integr Comp Physiol ; 311(5): R957-R963, 2016 11 01.
Artigo em Inglês | MEDLINE | ID: mdl-27733385

RESUMO

We tested the hypothesis that sympathetic responses to baroreceptor unloading may be affected by circulating sex hormones. During lower body negative pressure at -30, -60, and -80 mmHg, muscle sympathetic nerve activity (MSNA), heart rate, and blood pressure were recorded in women who were taking (n = 8) or not taking (n = 9) hormonal contraceptives. All women were tested twice, once during the low-hormone phase (i.e., the early follicular phase of the menstrual cycle and the placebo phase of hormonal contraceptive use), and again during the high-hormone phase (i.e., the midluteal phase of the menstrual cycle and active phase of contraceptive use). During baroreceptor unloading, the reductions in stroke volume and resultant increases in MSNA and total peripheral resistance were greater in high-hormone than low-hormone phases in both groups. When normalized to the fall in stroke volume, increases in MSNA were no longer different between hormone phases. While stroke volume and sympathetic responses were similar between women taking and not taking hormonal contraceptives, mean arterial pressure was maintained during baroreceptor unloading in women not taking hormonal contraceptives but not in women using hormonal contraceptives. These data suggest that differences in sympathetic activation between hormone phases, as elicited by lower body negative pressure, are the result of hormonally mediated changes in the hemodynamic consequences of negative pressure, rather than centrally driven alterations to sympathetic regulation.


Assuntos
Pressão Sanguínea/fisiologia , Hormônios Esteroides Gonadais/sangue , Frequência Cardíaca/fisiologia , Pressão Negativa da Região Corporal Inferior , Pressorreceptores/fisiologia , Sistema Nervoso Simpático/fisiologia , Adulto , Pressão Sanguínea/efeitos dos fármacos , Anticoncepcionais Orais Hormonais/administração & dosagem , Anticoncepcionais Orais Hormonais/farmacologia , Feminino , Fase Folicular/efeitos dos fármacos , Fase Folicular/fisiologia , Frequência Cardíaca/efeitos dos fármacos , Humanos , Fase Luteal/efeitos dos fármacos , Fase Luteal/fisiologia , Pressorreceptores/efeitos dos fármacos , Sistema Nervoso Simpático/diagnóstico por imagem
5.
Am J Physiol Heart Circ Physiol ; 308(6): H664-71, 2015 Mar 15.
Artigo em Inglês | MEDLINE | ID: mdl-25527774

RESUMO

This study aimed to examine the effects of sex (males vs. females) and sex hormones (menstrual cycle phases in women) on sympathetic responsiveness to severe chemoreflex activation in young, healthy individuals. Muscle sympathetic nerve activity (MSNA) was measured at baseline and during rebreathing followed by a maximal end-inspiratory apnea. In women, baseline MSNA was greater in the midluteal (ML) than early-follicular (EF) phase of the menstrual cycle. Baseline MSNA burst incidence was greater in men than women, while burst frequency and total MSNA were similar between men and women only in the ML phase. Chemoreflex activation evoked graded increases in MSNA burst frequency, amplitude, and total activity in all participants. In women, this sympathoexcitation was greater in the EF than ML phase. The sympathoexcitatory response to chemoreflex stimulation of the EF phase in women was also greater than in men. Nonetheless, changes in total peripheral resistance were similar between sexes and menstrual cycle phases. This indicates that neurovascular transduction was attenuated during the EF phase during chemoreflex activation, thereby offsetting the exaggerated sympathoexcitation. Chemoreflex-induced increases in mean arterial pressure were similar across sexes and menstrual cycle phases. During acute chemoreflex stimulation, reduced neurovascular transduction could provide a mechanism by which apnea-associated morbidity might be attenuated in women relative to men.


Assuntos
Células Quimiorreceptoras/metabolismo , Hipercapnia/metabolismo , Hipóxia/metabolismo , Ciclo Menstrual/metabolismo , Músculo Esquelético/inervação , Reflexo , Estresse Fisiológico , Sistema Nervoso Simpático/fisiopatologia , Potenciais de Ação , Adulto , Biomarcadores/sangue , Feminino , Hemodinâmica , Humanos , Hipercapnia/sangue , Hipercapnia/fisiopatologia , Hipóxia/sangue , Hipóxia/fisiopatologia , Masculino , Ciclo Menstrual/sangue , Fatores Sexuais , Fatores de Tempo , Adulto Jovem
6.
J Food Sci Technol ; 52(7): 4360-8, 2015 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-26139901

RESUMO

The objective of this work was to evaluate the effect of adding different starches (native and modified) on the physicochemical, sensory, structural and microbiological characteristics of low-fat chicken mortadella. Two formulations containing native cassava and regular corn starch, coded CASS (5.0 % of cassava starch) and CORN (5.0 % of regular corn starch), and one formulation produced with physically treated starch coded as MOD1 (2.5 % of Novation 2300) and chemically modified starch coded as MOD2 (2.5 % of Thermtex) were studied. The following tests were performed: physicochemical characterization (moisture, ash, protein, starch and lipid contents, and water activity); cooling, freezing and reheating losses; texture (texture profile test); color coordinates (L*, a*, b*, C and h); microbiological evaluation; sensory evaluation (multiple comparison and preference test); and histological evaluation (light microscopy). There was no significant difference (p > 0.05) for ash, protein, cooling loss, cohesiveness or in the preference test for the tested samples. The other evaluated parameters showed significant differences (p < 0.05). Histological study allowed for a qualitative evaluation between the physical properties of the food and its microscopic structure. The best results were obtained for formulation MOD2 (2.5 % Thermtex). The addition of modified starch resulted in a better performance than the native starch in relation to the evaluated technological parameters, mainly in relation to reheating losses, which demonstrated the good interaction between the modified starch in the structure of the product and the possibility of the application of this type of starch in other types of functional meat products.

7.
Monaldi Arch Chest Dis ; 78(1): 29-33, 2012 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-22928401

RESUMO

BACKGROUND: To evaluate the psychological characteristics of coronary heart disease (CHD) patients after coronary artery bypass grafting (CABG) by cluster analysis of Minnesota Multiphasic Personality Inventory (MMPI-2) questionnaires and to assess the impact of the profiles obtained on long-term outcome. METHODS: 229 CHD patients admitted to cardiac rehabilitation filled in self-administered MMPI-2 questionnaires early after CABG. We assessed the relation between MMPI-2 profiles derived by cluster analysis, clinical characteristics and outcome at 3-year follow-up. RESULTS: Among the 215 patients (76% men, median age 66 years) with valid criteria in control scales, we identified 3 clusters (G) with homogenous psychological characteristics: G1 patients (N = 75) presented somatoform complaints but overall minimal psychological distress. G2 patients (N=72) presented type D personality traits. G3 subjects (N=68) showed a trend to cynicism, mild increases in anger, social introversion and hostility. Clusters overlapped for clinical characteristics such as smoking (G1 21%, G2 24%, G3 24%, p ns), previous myocardial infarction (G1 43%, G2 47%, G3 49% p ns), LV ejection fraction (G1 60 [51-60]; G2 58 [49-60]; G3 60 [55-60], p ns), 3-vessel-disease prevalence (G1 69%, G2 65%, G3 71%, p ns). Three-year event rates were comparable (G1 15%; G2 18%; G3 15%) and Kaplan-Meier curves overlapped among clusters (p ns). CONCLUSIONS: After CABG, the interpretation of MMPI-2 by cluster analysis is useful for the psychological and personological diagnosis to direct psychological assistance. Conversely, results from cluster analysis of MMPI-2 do not seem helpful to the clinician to predict long term outcome.


Assuntos
Ponte de Artéria Coronária/psicologia , MMPI , Idoso , Análise por Conglomerados , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Fatores de Tempo , Resultado do Tratamento
8.
J Am Coll Health ; 70(3): 654-659, 2022 04.
Artigo em Inglês | MEDLINE | ID: mdl-32569507

RESUMO

Needle anxiety symptoms are prevalent among college students and predict lack of engagement in student health initiatives including influenza immunization programs. Most do not seek treatment for their anxiety. Objective: To develop and test a peer-delivered, brief motivational interview to promote help-seeking behaviors among college students with needle anxiety symptoms. Participants/Methods: 61 university students who reported needle anxiety symptoms and having avoided medical situations involving needles in the last year were randomized to intervention or control conditions. Analyses compared self-reported help seeking behaviors at three months post-intervention. Results: Intervention group participants were more than twice as likely to report help-seeking behavior at follow up (IR = 2.41; 95%CI = 1.29, 4.50; p=.006) than the control group. Participants also endorsed high levels of satisfaction with the intervention. Conclusions: This pilot intervention appears acceptable and feasible to implement using peers in the college setting. There is preliminary evidence for efficacy, with larger-scale replication needed.


Assuntos
Comportamento de Busca de Ajuda , Estudantes , Ansiedade/terapia , Humanos , Agulhas , Universidades
9.
Rev Sci Instrum ; 92(2): 023307, 2021 Feb 01.
Artigo em Inglês | MEDLINE | ID: mdl-33648074

RESUMO

An apparatus allowing continuous acquisition of thickness measurements during electropolishing of superconducting cavities is described. The instrument is based on the ultrasound thickness measurement technique and allows the connection of up to six probes. The apparatus has been employed to monitor the surface treatment of PIP-II low beta single cell prototypes developed and manufactured by LASA-INFN and specifically to measure surface removal at different points of interest on the cavity surface. The apparatus facilitated the development and optimization of electropolishing parameters for incorporation into the cavity manufacturing process.

10.
J Cell Biol ; 126(3): 631-9, 1994 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-8045928

RESUMO

Kinetoplast DNA, the mitochondrial DNA of trypanosomatid parasites, is a network containing several thousand minicircles and a few dozen maxicircles. We compared kinetoplast DNA replication in Trypanosoma brucei and Crithidia fasciculata using fluorescence in situ hybridization and electron microscopy of isolated networks. One difference is in the location of maxicircles in situ. In C. fasciculata, maxicircles are concentrated in discrete foci embedded in the kinetoplast disk; during replication the foci increase in number but remain scattered throughout the disk. In contrast, T. brucei maxicircles generally fill the entire disk. Unlike those in C. fasciculata, T. brucei maxicircles become highly concentrated in the central region of the kinetoplast after replication; then during segregation they redistribute throughout the daughter kinetoplasts. T. brucei and C. fasciculata also differ in the pattern of attachment of newly synthesized minicircles to the network. In C. fasciculata it was known that minicircles are attached at two antipodal sites but subsequently are found uniformly distributed around the network periphery, possibly due to a relative movement of the kinetoplast disk and two protein complexes responsible for minicircle synthesis and attachment. In T. brucei, minicircles appear to be attached at two antipodal sites but then remain concentrated in these two regions. Therefore, the relative movement of the kinetoplast and the two protein complexes may not occur in T. brucei.


Assuntos
Crithidia/genética , Replicação do DNA , DNA de Cinetoplasto/biossíntese , Trypanosoma brucei brucei/genética , Animais , DNA de Cinetoplasto/genética , Hibridização in Situ Fluorescente , Microscopia Eletrônica , Trypanosoma brucei brucei/ultraestrutura
11.
New Microbes New Infect ; 23: 39-43, 2018 May.
Artigo em Inglês | MEDLINE | ID: mdl-29556408

RESUMO

Shewanella algae are Gram-negative, nonfermentative, motile bacilli, classified in the genus Shewanella in 1985. These environmental bacteria are occasionally identified in human infections, with a relatively strong association with exposure to seawater during warm seasons. This report describes a case series of 17 patients with infection correlated to S. algae in the coastal area of Romagna, Italy, from 2013 to 2016. The types of infection included otitis, pneumonia, sepsis and soft tissue (wound). Exposure to the marine environment during hot months was confirmed in 12 of 17 patients. An apparent correlation between increased severity of infection and patient age was also observed.

12.
Mol Cell Biol ; 8(11): 4625-33, 1988 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-2850466

RESUMO

We examined the expression of a nucleus-encoded mitochondrial protein, cytochrome c, during the life cycle of Trypanosoma brucei. The bloodstream forms of T. brucei, the long slender and short stumpy trypanosomes, have inactive mitochondria with no detectable cytochrome-mediated respiration. The insect form of T. brucei, the procyclic trypanosomes, has fully functional mitochondria. Cytochrome c is spectrally undetectable in the bloodstream forms of trypanosomes, but during differentiation to the procyclic form, spectrally detected holo-cytochrome c accumulates rapidly. We have purified T. brucei cytochrome c and raised antibodies that react to both holo- and apo-cytochrome c. In addition, we isolated a partial cDNA to trypanosome cytochrome c. An examination of protein expression and steady-state mRNA levels in T. brucei indicated that bloodstream trypanosomes did not express cytochrome c but maintained significant steady-state levels of cytochrome c mRNA. The results suggest that in T. brucei, cytochrome c is developmentally regulated by a posttranscriptional mechanism which prevents either translation or accumulation of cytochrome c in the bloodstream trypanosomes.


Assuntos
Grupo dos Citocromos c/genética , Regulação da Expressão Gênica , Trypanosoma brucei brucei/genética , Sequência de Aminoácidos , Animais , Apoproteínas/biossíntese , Sequência de Bases , Grupo dos Citocromos c/biossíntese , Dados de Sequência Molecular , RNA Mensageiro/genética , RNA Mensageiro/metabolismo , Transcrição Gênica , Trypanosoma brucei brucei/crescimento & desenvolvimento , Trypanosoma brucei brucei/metabolismo
13.
New Microbes New Infect ; 9: 54-5, 2016 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-26862436

RESUMO

The first isolation of Catabacter hongkongensis in Italy is reported. Pleomorphic Gram-positive rods were grown in blood cultures from samples obtained from a 55-year-old patient admitted to the intensive care unit with sepsis after he experienced massive thoracic and abdominal trauma. The identification was obtained by amplification and sequencing of the 16S rRNA gene.

14.
Oncogene ; 18(28): 4160-5, 1999 Jul 15.
Artigo em Inglês | MEDLINE | ID: mdl-10435598

RESUMO

Most of the hereditary breast cancers are attributed to constitutive alterations of either BRCA1 or BRCA2 genes; nonetheless, germline mutations of these genes in 'high risk' families are found less frequently than expected from linkage data. Recent findings suggest that major genomic rearrangements of the BRCA1 gene might account for at least some of the apparently mutation negative cases. We studied 60 affected probands belonging to families with a strong history of breast and/or ovarian cancer who scored negative for BRCA1 gene mutations by PTT and SSCP analysis. DNA was analysed by the Southern blotting procedure using three different restriction enzymes, and two probes obtained by RT-PCR of the 5' and 3' BRCA1 coding sequence. A 3 kb deletion encompassing exon 17 and causing a frameshift mutation was identified in two independently ascertained families. RT-PCR and long-range DNA PCR were employed to characterize the rearrangement that was finally shown to be the result of a recombination between two very similar Alu repeats. This type of mutation is not identified by the conventional methods of mutation detection which are based on PCR amplification of single exons. Therefore, further search for gene rearrangements is needed to better define the proportion of 'high risk' families that might be explained by gross genomic alterations of the BRCA1 gene.


Assuntos
Elementos Alu , Neoplasias da Mama/genética , Genes BRCA1 , Síndromes Neoplásicas Hereditárias/genética , Neoplasias Ovarianas/genética , Sequência de Bases , Southern Blotting , Análise Mutacional de DNA , DNA de Neoplasias/genética , Éxons/genética , Feminino , Mutação da Fase de Leitura , Humanos , Itália , Dados de Sequência Molecular , Fenótipo , Polimorfismo Conformacional de Fita Simples , Recombinação Genética , Reação em Cadeia da Polimerase Via Transcriptase Reversa , Alinhamento de Sequência , Deleção de Sequência , Homologia de Sequência do Ácido Nucleico
15.
Diabetes Care ; 21(9): 1397-402, 1998 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-9727883

RESUMO

OBJECTIVE: To evaluate the accuracy of LDL cholesterol calculated with Friedewald's equation in the assessment of cardiovascular risk in NIDDM patients. RESEARCH DESIGN AND METHODS: The calculation of LDL cholesterol according to Friedewald's formula was compared with the measurement of LDL cholesterol separated by ultracentrifugation in 151 NIDDM patients with fairly good metabolic control (HbA1c < or =10%) and in 405 nondiabetic subjects. RESULTS: Measured and calculated LDL cholesterol was found to be well correlated in both diabetic (r = 0.95) and nondiabetic (r = 0.97) subjects. Compared with measured LDL cholesterol, the calculated LDL cholesterol differed by > or =10% in 34% of samples from diabetic patients and in 26% of samples from nondiabetic subjects (chi(2) = 3.885, P < 0.05). The percentage of error increased when the serum triglyceride (TG) level was > or =200 mg/dl (2.26 mmol/l) and when the ratio of VLDL cholesterol to TG was <0.20 or >0.29 in both groups of subjects. Although the percentage of error from calculated LDL cholesterol was greater in diabetic than in nondiabetic subjects because of the greater prevalence of hypertriglyceridemia in the former group, the misclassification of coronary heart disease risk, according to the cutoff points of the National Cholesterol Education Program (NCEP), was similar in the two groups (25% in diabetic and 22% in nondiabetic subjects). In both groups of patients, the misclassification of coronary heart disease risk was higher when calculation of LDL cholesterol produced values near the cutoff points. CONCLUSIONS: Although accuracy in the estimation of LDL cholesterol is less than ideal, Friedewald's equation seems to be of value in the correct assignment of coronary heart disease risk classes in the great majority of diabetic as well as nondiabetic subjects. Caution must be exercised for subjects in whom calculated LDL cholesterol is close to the cutoff points of the NCEP guidelines.


Assuntos
LDL-Colesterol/sangue , Doença das Coronárias/etiologia , Diabetes Mellitus Tipo 2/complicações , Hemoglobinas Glicadas/análise , Humanos , Fatores de Risco , Triglicerídeos/sangue , Ultracentrifugação
16.
Mol Biochem Parasitol ; 57(2): 305-15, 1993 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-8381918

RESUMO

The expression of cytochrome c is developmentally regulated during the life cycle of Trypanosoma brucei. The level of regulation appears to be post-transcriptional since cytochrome c mRNA is present in all life stages of the parasite. We have used RNA from each life stage to prime in vitro translation systems and found that the cytochrome c mRNAs are equally translatable. Continuous labeling experiments conducted in vivo indicate that cytochrome c is synthesized at similar rates in both bloodstream and procyclic trypanosomes. Western blots, however, confirm that steady-state levels of cytochrome c are severely depressed in bloodstream forms. In a series of pulse/chase experiments we demonstrate that the half-life of cytochrome c is approximately 1 h in the bloodstream form and no detectable turnover occurred in the procyclic form. We conclude that a major step in the developmental regulation of cytochrome c expression in T. brucei occurs post-translationally due to rapid turnover of the protein in the bloodstream trypanosomes.


Assuntos
Grupo dos Citocromos c/metabolismo , Proteínas de Protozoários/metabolismo , Trypanosoma brucei brucei/metabolismo , Animais , Sequência de Bases , Grupo dos Citocromos c/genética , DNA de Protozoário/genética , Dados de Sequência Molecular , Biossíntese de Proteínas , RNA Mensageiro/genética , RNA Mensageiro/metabolismo , RNA de Protozoário/genética , RNA de Protozoário/metabolismo , Trypanosoma brucei brucei/genética , Trypanosoma brucei brucei/crescimento & desenvolvimento
17.
Mol Biochem Parasitol ; 59(2): 191-200, 1993 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-8341318

RESUMO

MCP72 is a mitochondrial hsp70 protein from the trypanosomatid Crithidia fasciculata. An MCP72 cDNA clone was isolated from a C. fasciculata cDNA library by screening with antiserum specific for the homologous protein of Trypanosoma cruzi [9]. The MCP72 cDNA encodes a polypeptide of 663 amino acids which is 84% identical to the Trypanosoma cruzi protein and 56% identical to the Escherichia coli hsp70 protein DnaK. MCP72 is less similar to other hsp70 proteins. Native MCP72 was purified to homogeneity by ATP-agarose affinity chromatography. Comparison of its N-terminal amino acid sequence with that deduced from the cDNA sequence shows that 20 amino acid residues had been cleaved from the N-terminus; this sequence probably represents a mitochondrial import signal which is cleaved during translocation into the mitochondrion. Fluorescence microscopy, using antibodies specific for MCP72, indicates that the protein is concentrated in a region of the mitochondrial matrix which surrounds the kinetoplast.


Assuntos
Crithidia fasciculata/metabolismo , Proteínas de Choque Térmico/biossíntese , Mitocôndrias/metabolismo , Adenosina Trifosfatases/biossíntese , Adenosina Trifosfatases/metabolismo , Sequência de Aminoácidos , Animais , Sequência de Bases , Clonagem Molecular , Crithidia fasciculata/genética , DNA de Protozoário/genética , DNA de Protozoário/metabolismo , Biblioteca Gênica , Proteínas de Choque Térmico/genética , Proteínas de Choque Térmico/metabolismo , Dados de Sequência Molecular , Proteínas Recombinantes/biossíntese , Proteínas Recombinantes/metabolismo , Mapeamento por Restrição , Homologia de Sequência de Aminoácidos , Trypanosoma cruzi/genética , Trypanosoma cruzi/metabolismo
18.
Mol Biochem Parasitol ; 54(1): 31-41, 1992 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-1381496

RESUMO

The steady-state levels of the mitochondrial ribosomal RNAs of Trypanosoma brucei are repressed in the early bloodstream developmental stage of the parasite and accumulate approximately 30-fold during differentiation to the stage found in the midgut of the insect vector. In order to determine the mechanism regulating this developmental process, we have examined the transcription and processing of the 9S and 12S mitochondrial rRNAs of T. brucei. A short-lived RNA was detected in pulse labeling experiments which contains the mature 12S and 9S rRNAs and at least 1200 nucleotides of RNA transcribed from upstream of the 12S rRNA gene. This putative processing precursor RNA was identified in both intact cells and in run-on experiments using isolated mitochondria. The transcripts containing the upstream sequences are unstable and reach isotopic equilibrium within 15 min. Mature rRNAs in the insect developmental stage are stable and show no detectable turnover during a 36-h chase. Comparison of rRNA synthesis in bloodstream and insect life-stages indicates that mitochondrial rRNA levels are controlled not at the transcriptional level, but rather by a mechanism which likely modulates the stability of the mature rRNAs. These results suggest that a short-lived rRNA precursor is synthesized and processed at comparable rates in both bloodstream and insect stages of the parasite. Thus, it appears that differential stability of the mature 9S and 12S rRNAs plays a major role in modulating mitochondrial gene expression during the developmental cycle of T. brucei.


Assuntos
RNA de Protozoário/biossíntese , RNA Ribossômico/biossíntese , RNA/biossíntese , Trypanosoma brucei brucei/genética , Animais , Processamento Pós-Transcricional do RNA , RNA Mitocondrial , Transcrição Gênica/fisiologia , Trypanosoma brucei brucei/crescimento & desenvolvimento
19.
Clin Ther ; 23(6): 851-7, 2001 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-11440285

RESUMO

BACKGROUND: Simvastatin 40 to 80 mg/d has been found to increase high-density lipoprotein cholesterol (HDL-C) levels significantly more than atorvastatin at equipotent doses (ie, 20-80 mg/d). Data on the effects of lower doses of the 2 drugs on HDL-C levels are conflicting. OBJECTIVE: The purpose of this study was to investigate the effects of simvastatin 20 mg/d and atorvastatin 10 mg/d on HDL-C levels in patients with hypercholesterolemia. METHODS: Patients with primary hypercholesterolemia (total cholesterol [TC] >250 mg/dL) who were not taking any lipid-lowering agents and who were following a low-fat diet were randomized to receive 1 of 2 treatments: simvastatin 20 mg/d or atorvastatin 10 mg/d. Serum TC, triglycerides (TG), low-density lipoprotein cholesterol (LDL-C), and HDL-C levels were measured using standard methods after 2 months of therapy. In a secondary analysis, lipids and lipoprotein cholesterol were measured after 1 year in patients who continued treatment. RESULTS: Of the 240 patients enrolled (108 men and 132 women; age range, 23-77 years, mean [SEM] 56.7 [0.69]), 235 completed the study. After 2 months of therapy, TC, LDL-C, and serum TG levels decreased significantly versus baseline in both groups (P < 0.001), with no significant differences between treatment groups. HDL-C levels increased by 9.0% (P < 0.001 vs baseline) in the simvastatin group and by 4.3% (P < 0.02) in the atorvastatin group. The difference between the 2 groups in the percentage increase in HDL-C was statistically significant (P < 0.05). In 113 patients who continued treatment, HDL-C levels at 1 year were still significantly higher than baseline levels in the simvastatin group (6.3%, P = 0.034), but not in the atorvastatin group (2.8%, P = 0.587). CONCLUSIONS: The findings from this study suggest that the HDL-C-increasing effect of simvastatin 20 mg is significantly greater than that of atorvastatin 10 mg. Since increasing HDL-C levels is thought to lower the risk for atherosclerosis and coronary heart disease, these results warrant further investigation.


Assuntos
Anticolesterolemiantes/uso terapêutico , HDL-Colesterol/sangue , Ácidos Heptanoicos/uso terapêutico , Hipercolesterolemia/tratamento farmacológico , Pirróis/uso terapêutico , Sinvastatina/uso terapêutico , Adulto , Idoso , Anticolesterolemiantes/administração & dosagem , Anticolesterolemiantes/efeitos adversos , Atorvastatina , Feminino , Ácidos Heptanoicos/administração & dosagem , Ácidos Heptanoicos/efeitos adversos , Humanos , Hipercolesterolemia/sangue , Lipídeos/sangue , Masculino , Pessoa de Meia-Idade , Pirróis/administração & dosagem , Pirróis/efeitos adversos , Sinvastatina/administração & dosagem , Sinvastatina/efeitos adversos
20.
Eur J Surg Oncol ; 15(1): 39-42, 1989 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-2917664

RESUMO

Estrogen receptor levels were determined at the time of ovariectomy in 71 premenopausal women with advanced breast cancer. Three groups of estrogen receptor concentration were established: less than 10 fmol/mg cytosol protein (group 1), between 10 and 25 fmol/mg cytosol protein (group 2), and more than 25 fmol/mg cytosol protein (group 3). The frequency of clinical response to ovariectomy was low in group 1 (17.4%), high in group 3 (79.4%), and intermediate in group 2 (35.7%). Median survival was poor in group 1 (18.5 months) and better in groups 2 (33.0 months) and 3 (32.5 months). These results were independent of disease stage and neoplastic localization.


Assuntos
Neoplasias da Mama/cirurgia , Ovariectomia , Receptores de Estrogênio/análise , Adulto , Neoplasias da Mama/análise , Neoplasias da Mama/mortalidade , Citosol/análise , Feminino , Humanos , Pessoa de Meia-Idade , Recidiva Local de Neoplasia , Estadiamento de Neoplasias , Indução de Remissão
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