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1.
Animal ; 17(5): 100800, 2023 May.
Article in English | MEDLINE | ID: mdl-37121160

ABSTRACT

Medullated fibres, due to their higher resistance to bending and pressure, constitute a problem for the textile industry. Thus, having practical instruments to identify them is essential. Therefore, the aim of this research was to develop and validate a novel, swift, automatic system (referred to as S-FiberMed) for medullation and diameter assessment of animal fibres based on artificial intelligence. The medullation of 88 samples of alpaca, llama and mohair fibres (41, 43 and 4, respectively) was evaluated. Additionally, 269 samples of alpacas were considered for average fibre diameter (AFD) and the results were compared with the Portable Fiber Tester (PFT) and Optical Fibre Diameter Analyser (OFDA) methods (72 and 197 samples, respectively). The preparation of each sample to be analysed followed the procedure described in IWTO-8-2011. Version 5 of "You Only Look Once" and DenseNet models were used to recognise the type of medullation and diameter of the fibres, respectively. Within each image (n = 661 for alpaca), all fibres were labelled (as Non-Medullated, Fragmented Medulla, Uncontinuous Medulla, Continuous Medulla and Strongly Medullated) using the LabelImg tool. Data augmentation technique was applied to obtain 3 966 images. Such data set was divided into 3 576 and 390 images for training and test data, respectively. For mohair samples (n = 321), a similar process was carried out. The data to train the model used to infer the diameter contained 16 446 fibres labelled with his respective AFD. A complementary hardware composed of three subsystems (mechanical, electronic, and optical) was developed for evaluation purposes. T-test, Pearson and Concordance correlation, Bland-Altman plot and linear regression analyses were used to validate and compare the S-Fiber Med with other methods. Results indicate that there was no significant difference between medullation percentage obtained with the projection microscope and the S-Fiber Med. The Pearson and Concordance correlation analysis shows a strong, high and significant relationship (P-value < 0.001). The AFDs of alpaca and llama fibre samples obtained with the two methods are very similar, because no significant difference was found at the t-test (P-value > 0.172), and they have a strong, high and significant relationship between them, given the high Pearson correlation value (r ≥ 0.96 with P-value < 0.001), high Concordance coefficient and bias correction factor. Similar results were found when PFT and OFDA100 were compared with S-Fiber Med. As a conclusion, this new system provides precise, accurate measurements of medullation and AFD in an expeditious fashion (40 seconds/sample).


Subject(s)
Camelids, New World , Animals , Artificial Intelligence
2.
Virulence ; 8(8): 1761-1775, 2017 11 17.
Article in English | MEDLINE | ID: mdl-28762868

ABSTRACT

OBJECTIVE: Staphylococcus aureus is a particularly difficult pathogen to eradicate from the respiratory tract. Previous studies have highlighted the intracellular capacity of S.aureus in several phagocytic and non-phagocytic cells. The aim of this study was to define S.aureus interaction within a murine alveolar macrophage cell line. METHODS: Cell line MH-S was infected with Newman strain. Molecular mechanisms involved in phagocytosis were explored. To assess whether S.aureus survives intracellularly quantitative (gentamicin protection assays and bacterial plating) and qualitative analysis (immunofluorescence microscopy) were performed. Bacterial colocalization with different markers of the endocytic pathway was examined to characterize its intracellular trafficking. RESULTS: We found that S.aureus uptake requires host actin polymerization, microtubule assembly and activation of phosphatidylinositol 3-kinase signaling. Time course experiments showed that Newman strain was able to persist within macrophages at least until 28.5 h post infection. We observed that intracellular bacteria are located inside an acidic subcellular compartment, which co-localizes with the late endosome/lysosome markers Lamp-1, Rab7 and RILP. Colocalization counts with TMR-dextran might reflect a balance between bacterial killing and intracellular survival. CONCLUSIONS: This study indicates that S.aureus persists and replicates inside murine alveolar macrophages, representing a privileged niche that can potentially offer protection from antimicrobial activity and immunological host defense mechanisms.


Subject(s)
Macrophages, Alveolar/microbiology , Staphylococcal Infections/microbiology , Staphylococcus aureus/physiology , Animals , Cell Line , Macrophages, Alveolar/immunology , Mice , Microbial Viability , Phagocytosis , Staphylococcal Infections/immunology , Staphylococcus aureus/genetics , Staphylococcus aureus/growth & development
5.
Eur Respir J ; 39(2): 467-77, 2012 Feb.
Article in English | MEDLINE | ID: mdl-21737564

ABSTRACT

The human respiratory tract of individuals with normal lung function maintains a fine-tuned balance, being asymptomatically colonised by the normal microbiota in the upper airways and sterile in the lower tract. This equilibrium may be disrupted by the exposure to insults such as cigarette smoke. In the respiratory tract, the complex and noxious nature of inhaled cigarette smoke alters host-microorganism interaction dynamics at all anatomical levels, causing infections in many cases. Moreover, continuous exposure to cigarette smoke itself causes deleterious effects on the host that can trigger the development of chronic respiratory diseases, such as chronic obstructive pulmonary disease (COPD) and lung cancer. COPD is an irreversible airflow obstruction associated with emphysema, fibrosis, mucus hypersecretion and persistent colonisation of the lower airways by opportunistic pathogens. COPD patients keep a stable (without exacerbation) but progressively worsening condition and suffer periodic exacerbations caused, in most cases, by infections. Although smoking and smoking-associated diseases are associated with a high risk of infection, most therapies aim to reduce inflammatory parameters, but do not necessarily take into account the presence of persistent colonisers. The effect of cigarette smoke on host-pathogen interaction dynamics in the respiratory tract, together with current and novel therapies, is discussed.


Subject(s)
Host-Pathogen Interactions/physiology , Pulmonary Disease, Chronic Obstructive/etiology , Pulmonary Disease, Chronic Obstructive/microbiology , Smoking/adverse effects , Humans , Pneumonia/etiology , Pneumonia/immunology , Pneumonia/microbiology , Pulmonary Disease, Chronic Obstructive/immunology
6.
Eur J Clin Microbiol Infect Dis ; 30(11): 1391-8, 2011 Nov.
Article in English | MEDLINE | ID: mdl-21479973

ABSTRACT

Pan-resistant Acinetobacter baumannii have prompted the search for therapeutic alternatives. We evaluate the efficacy of four cecropin A-melittin hybrid peptides (CA-M) in vivo. Toxicity was determined in mouse erythrocytes and in mice (lethal dose parameters were LD(0), LD(50), LD(100)). Protective dose 50 (PD(50)) was determined by inoculating groups of ten mice with the minimal lethal dose of A. baumannii (BMLD) and treating with doses of each CA-M from 0.5 mg/kg to LD(0). The activity of CA-Ms against A. baumannii was assessed in a peritoneal sepsis model. Mice were sacrificed at 0 and 1, 3, 5, and 7-h post-treatment. Spleen and peritoneal fluid bacterial concentrations were measured. CA(1-8)M(1-18) was the less haemolytic on mouse erythrocytes. LD(0) (mg/kg) was 32 for CA(1-8)M(1-18), CA(1-7)M(2-9), and Oct-CA(1-7)M(2-9), and 16 for CA(1-7)M(5-9). PD(50) was not achieved with non-toxic doses (≤ LD(0)). In the sepsis model, all CA-Ms were bacteriostatic in spleen, and decreased bacterial concentration (p < 0.05) in peritoneal fluid, at 1-h post-treatment; at later times, bacterial regrowth was observed in peritoneal fluid. CA-Ms showed local short-term efficacy in the peritoneal sepsis model caused by pan-resistant Acinetobacter baumannii.


Subject(s)
Acinetobacter Infections/drug therapy , Acinetobacter baumannii/drug effects , Anti-Bacterial Agents/pharmacology , Antimicrobial Cationic Peptides/pharmacology , Melitten/pharmacology , Sepsis/diagnosis , Acinetobacter Infections/microbiology , Acinetobacter Infections/mortality , Acinetobacter baumannii/growth & development , Animals , Anti-Bacterial Agents/therapeutic use , Antimicrobial Cationic Peptides/therapeutic use , Ascitic Fluid/microbiology , Drug Resistance, Bacterial , Erythrocytes/drug effects , Female , Humans , Injections, Intraperitoneal , Lethal Dose 50 , Melitten/therapeutic use , Mice , Mice, Inbred C57BL , Microbial Sensitivity Tests , Models, Animal , Recombinant Fusion Proteins , Sepsis/microbiology , Sepsis/mortality , Spleen/microbiology , Time Factors
7.
Eur Respir J ; 33(2): 273-81, 2009 Feb.
Article in English | MEDLINE | ID: mdl-19010986

ABSTRACT

Lipopolysaccharide-binding protein (LBP) and CD14 contribute to the recognition of pathogens by cells, which triggers the activation of defence responses. Smoking is a risk factor for the development of chronic obstructive pulmonary disease (COPD) and respiratory infections. The current authors theorised that levels of LBP and CD14 in the lungs of smokers would be higher than those in the lungs of never-smokers. These elevated levels could affect host responses upon infection. LBP, soluble CD14 (sCD14) and interleukin (IL)-8 were detected by ELISA. Nuclear factor (NF)-kappaB, p38 and the inhibitor IkappaBalpha were studied by immunoassays. Gene expression was assessed by RT-PCR. Bronchoalveolar lavage levels of LBP and CD14 were significantly higher in smokers and COPD patients than in never-smokers, whereas levels of both proteins were not significantly different between smokers and COPD patients. IL-6, IL-1beta and cigarette smoke condensate induced the expression of LBP and CD14 by airway epithelial cells. LBP and sCD14 inhibited the nontypeable Haemophilus influenzae (NTHi)-dependent secretion of IL-8 and the activation of NF-kappaB and p38 mitogen-activated protein kinase signalling pathways but they increased the internalisation of NTHi by airway epithelial cells. Thus, in the inflamed airways of smokers both proteins could contribute to inhibit bacteria-dependent cellular activation without compromising the internalisation of pathogens by airway cells.


Subject(s)
Acute-Phase Proteins/biosynthesis , Bronchoalveolar Lavage Fluid , Carrier Proteins/biosynthesis , Lipopolysaccharide Receptors/biosynthesis , Lung/metabolism , Membrane Glycoproteins/biosynthesis , Smoking/adverse effects , Cell Line, Tumor , Enzyme-Linked Immunosorbent Assay , Haemophilus influenzae/metabolism , Humans , I-kappa B Proteins/biosynthesis , Interleukin-8/biosynthesis , NF-KappaB Inhibitor alpha , NF-kappa B/biosynthesis , Risk Factors , Spirometry , p38 Mitogen-Activated Protein Kinases/biosynthesis
8.
An. med. interna (Madr., 1983) ; 25(6): 262-268, jun. 2008. ilus, tab
Article in Es | IBECS | ID: ibc-68369

ABSTRACT

Objetivo: VEIA es un registro evolutivo de las intoxicaciones agudas (IA) atendidas en Urgencias del Hospital Doce de Octubre de Madrid en un año completo (1979 [2], 1985 [3], 1990 [4], 1994 [5], 1997 [6] y 2000 [7]) presentamos el estudio del año 2004 y comparamos los resultados con los de años anteriores (1-7). Métodos y resultados: el método es idéntico. De las 1.508 IA, 610 son intentos de suicidio (IBAIS) 319 etílicas (IAVE) y 219 drogas (IAVD). De los 2.259 tóxicos implicados el 48% son medicamentos (50% diazepóxidos) alcohol 25% y drogas el 13%. Conclusiones: este año ha supuesto un importante aumento (34%) del número de casos y la incidencia supera a todas las publicadas en nuestro país (25,31,40). Aunque en el conjunto no hay diferencia significativa de género con el Censo de Área, la hay en IBAIS, IAVE y IAVD. Las IBAIS crecen un 35%; Se duplica el uso de benzodiacepinas y antidepresivos en los IS de mujeres y crecen también en hombres pero menos; El paracetamol se mantiene en el 23% AINE, adyuvantes y míorelajantes aumentan en mujeres y también el uso de alcohol y otros no fármacos en los is de mujeres casi igualándose con los hombres. La cuarta parte de los hombres con IS eran adictos y aparecen 13 casos de trastornos alimentarios. En las IAVE crecen el grupo sin etilismo y baja eltotal. Las drogas se duplican con respecto al año anterior: la cocaína supone los 2/3 también suben la MDMA (22 casos) y aparecen nuevas drogas, como el pegamento, sin duda efecto de la inmigración, y ketamina; incluso cuatro casos no pudieron ser etiquetados por la falta de medios diagnósticos en la urgencia


Objetive: VEIA study is an evolutional registry of acute poisonings (AP) attended in the Emergency Room of the Doce de Octubre Hospitalin Madrid (Spain) in a whole year (1979, 1985, 1990, 1994,1997 and 2000). We present the 2004 study and compare the results with the previous years. Methods and results: Methodology has been identical across VEIA STUDY. Of 1508 AP, 610 are suicide attempts (IAVIS), 319 ethylic, (IAVE), and 218 by illicit drugs (IAVD). Of the 2,259 toxics involved,48% are medications (50% benzodiacepines) alcohol 25% and illicit drugs 13%. Conclusions: There is an important increase (34%) of cases and the incidence surpasses all published in our country. There are no gender differences nor in the whole neither the Health Area Census, but there are differences in IAVIS, IAVE and IAVD. IAVIS increase in 35%. Benzodiacepines poisoning increases two-fold as well as antidepressive drugs do in women. In men also increase, but in a minor extent. Acetaminophen remains the same in 23%. NSAID’s, adjuvants and myorelaxants increase in women as do also alcohol and other poisons that almost equal men’s. There are 13 cases of IAVIS in patients with alimentary disorders. Among men, a quarter are illicit drug abusers. In IAVE, the group without alcoholism grows and the total decreases. Illicit drugs duplicate the number of the former year. Cocaine supposes already 2/3 of the cases, MDMA ascends to 22 cases and they appear new substancesas glue, without doubt as an effect of immigration and ketamine. Finally 205 household accidents and 57 industrial injuries complete the series


Subject(s)
Humans , Male , Female , Epidemiological Monitoring , Poisoning/epidemiology , Poisoning/prevention & control , Alcoholic Intoxication/complications , Alcoholic Intoxication/diagnosis , Alcoholic Intoxication/therapy , Methadone/therapeutic use , Spain/epidemiology , Suicide, Attempted/prevention & control , Suicide, Attempted/statistics & numerical data , Drug Eruptions/complications , Foodborne Diseases/epidemiology
9.
An Med Interna ; 25(2): 67-72, 2008 Feb.
Article in Spanish | MEDLINE | ID: mdl-18432362

ABSTRACT

OBJECTIVE: VEIA study is an evolutional registry of acute poisonings (AP) attended in the Emergency Room of the Doce de Octubre Hospital in Madrid (Spain) in a whole year (1979,1985, 1990, 1994,1997 and 2000). We present the 2004 study and compare the results with the previous years. METHODS AND RESULTS: Methodology has been identical across VEIA study. Of 1508 AP, 610 are suicide attempts (IAVIS), 319 ethylic, (IAVE), and 218 by illicit drugs (IAVD). Of the 2,259 toxics involved, 48% are medications (50% benzodiacepines) alcohol 25% and illicit drugs 13%. CONCLUSIONS: There is an important increase (34%) of cases and the incidence surpasses all published in our country. There are no gender differences nor in the whole neither the Health Area Census, but there are differences in IAVIS, IAVE and IAVD. IAVIS increase in 35%. Benzodiacepines poisoning increases two-fold as well as antidepressive drugs do in women. In men also increase, but in a minor extent. Acetaminophen remains the same in 23%. NSAID's, adjuvants and myorelaxants increase in women as do also alcohol and other poisons that almost equal men's. There are 13 cases of IAVIS in patients with alimentary disorders. Among men, a quarter are illicit drug abusers. In IAVE, the group without alcoholism grows and the total decreases. Illicit drugs duplicate the number of the former year. Cocaine supposes already 2/3 of the cases, MDMA ascends to 22 cases and they appear new substances as glue, without doubt as an effect of immigration and ketamine. Finally 205 household accidents and 57 industrial injuries complete the series.


Subject(s)
Poisoning/epidemiology , Adolescent , Adult , Aged , Aged, 80 and over , Cross-Sectional Studies , Female , Humans , Male , Middle Aged , Spain , Urban Population
10.
An. med. interna (Madr., 1983) ; 25(2): 67-72, feb. 2008. ilus
Article in Es | IBECS | ID: ibc-64076

ABSTRACT

Objetivo: VEIA es un registro evolutivo de las intoxicaciones agudas (IA) atendidas en Urgencias del Hospital Doce de Octubre de Madrid en un año completo [1979 (2), 1985 (3), 1990 (4), 1994 (5), 1997 (6) y 2000 (7)] presentamos el estudio del año 2004 y comparamos los resultados con los de años anteriores (1-7). Métodos y resultados: el método es idéntico. De las 1.508 IA, 610 son intentos de suicidio (IBAIS) 319 etílicas (IAVE) y 219 drogas (IAVD). De los 2259 tóxicos implicados el 48% son medicamentos (50% diazepóxidos) alcohol 25% y drogas el 13%. Conclusiones: este año ha supuesto un importante aumento (34%) del número de casos y la incidencia supera a todas las publicadas en nuestro país (25,31,40) Aunque en el conjunto no hay diferencia significativa de género con el Censo de Área, la hay en IBAIS, IAVE y IAVD. Las IBAIS crecen un 35%; Se duplica el uso de benzodiacepinas y antidepresivos en los IS de mujeres y crecen también en hombres pero menos; El paracetamol se mantiene en el 23% AINES, adyuvantes y mío-relajantes aumentan en mujeres y también el uso de alcohol y otros no fármacos en los is de mujeres casi igualándose con los hombres. La cuarta parte de los hombres con IS eran adictos y aparecen 13 casos de trastornos alimentarios. En las IAVE crecen el grupo sin etilismo y baja el total. Las drogas se duplican con respecto al año anterior la cocaína supone los 2/3 también suben la MDMA (22 casos) y aparecen nuevas drogas, como el pegamento, sin duda efecto de la inmigración, y ketamina; incluso cuatro casos no pudieron ser etiquetados por la falta de medios diagnósticos en la urgencia


Objetive: VEIA study is an evolutional registry of acute poisonings (AP) attended in the Emergency Room of the Doce de Octubre Hospital in Madrid (Spain) in a whole year (1979,1985, 1990, 1994,1997 and 2000). We present the 2004 study and compare the results with the previous years. Methods and results: Methodology has been identical across VEIA STUDY. Of 1508 AP, 610 are suicide attempts (IAVIS), 319 ethylic, (IAVE), and 218 by illicit drugs (IAVD). Of the 2,259 toxics involved,48% are medications (50% benzodiacepines) alcohol 25% and illicit drugs 13%. Conclusions: There is an important increase (34%) of cases and the incidence surpasses all published in our country. There are no gender differences nor in the whole neither the Health Area Census, but there are differences in IAVIS, IAVE and IAVD. IAVIS increase in 35%. Benzodiacepines poisoning increases two-fold as well as antidepressive drugs do in women. In men also increase, but in a minor extent. Acetaminophenre mains the same in 23%. NSAID’s, adjuvants and myorelaxants increase in women as do also alcohol and other poisons that almost equal men’s. There are 13 cases of IAVIS in patients with alimentary disorders. Among men, a quarter are illicit drug abusers. In IAVE, the group without alcoholism grows and the total decreases. Illicit drugs duplicate the number of the former year. Cocaine supposes already 2/3 of the cases, MDMA ascends to 22 cases and they appear new substances as glue, without doubt as an effect of immigration and ketamine. Finally 205 house hold accidents and 57 industrial injuries complete the series


Subject(s)
Humans , Male , Female , Adolescent , Adult , Middle Aged , Aged , Epidemiological Monitoring , Poisoning/complications , Poisoning/diagnosis , Alcoholism/epidemiology , Alcoholism/prevention & control , Acetaminophen/therapeutic use , Alcoholic Intoxication/epidemiology , Tranquilizing Agents/toxicity , Emergency Medical Services/methods , Emergency Medical Services , Emergency Medicine/methods , Suicide, Attempted/prevention & control , Suicide, Attempted/statistics & numerical data , Antidepressive Agents/therapeutic use , Toxic Wastes , Toxic Substances , Toxic Gases
11.
An Med Interna ; 25(6): 262-8, 2008 Jun.
Article in Spanish | MEDLINE | ID: mdl-19295972

ABSTRACT

OBJECTIVE: VEIA study is an evolutional registry of acute poisonings (AP) attended in the Emergency Room of the Doce de Octubre Hospital in Madrid (Spain) in a whole year (1979, 1985, 1990, 1994,1997 and 2000). We present the 2004 study and compare the results with the previous years. METHODS AND RESULTS: Methodology has been identical across VEIA STUDY. Of 1508 AP, 610 are suicide attempts (IAVIS), 319 ethylic, (IAVE), and 218 by illicit drugs (IAVD). Of the 2,259 toxics involved, 48% are medications (50% benzodiacepines) alcohol 25% and illicit drugs 13%. CONCLUSIONS: There is an important increase (34%) of cases and the incidence surpasses all published in our country. There are no gender differences nor in the whole neither the Health Area Census, but there are differences in IAVIS, IAVE and IAVD. IAVIS increase in 35%. Benzodiacepines poisoning increases two-fold as well as antidepressive drugs do in women. In men also increase, but in a minor extent. Acetaminophen remains the same in 23%. NSAID's, adjuvants and myorelaxants increase in women as do also alcohol and other poisons that almost equal men's. There are 13 cases of IAVIS in patients with alimentary disorders. Among men, a quarter are illicit drug abusers. In IAVE, the group without alcoholism grows and the total decreases. Illicit drugs duplicate the number of the former year. Cocaine supposes already 2/3 of the cases, MDMA ascends to 22 cases and they appear new substances as glue, without doubt as an effect of immigration and ketamine. Finally 205 household accidents and 57 industrial injuries complete the series.


Subject(s)
Poisoning/epidemiology , Population Surveillance , Registries , Accidents, Home , Accidents, Occupational , Acetaminophen/poisoning , Acute Disease , Adolescent , Adult , Age Factors , Aged , Aged, 80 and over , Alcoholic Intoxication/epidemiology , Antidepressive Agents/poisoning , Benzodiazepines/poisoning , Chi-Square Distribution , Cocaine/poisoning , Emergency Service, Hospital , Female , Humans , Illicit Drugs/poisoning , Incidence , Male , Middle Aged , Sex Factors , Spain/epidemiology , Suicide, Attempted/statistics & numerical data
12.
Opt Lett ; 32(11): 1462-4, 2007 Jun 01.
Article in English | MEDLINE | ID: mdl-17546155

ABSTRACT

We report the first observation to our knowledge of room-temperature continuous-wave laser operation of a Pr(3+):KY(3)F(10) single crystal at 644.5 nm, pumped by a blue GaN laser diode emitting at 446 nm. With a 2.5% transmission output coupler and a nonoptimized optical cavity, an output power of 39 mW was obtained at 644.5 nm with a laser threshold of 125 mW and a differential slope efficiency of 23%.

13.
Actas Urol Esp ; 29(7): 715-8, 2005.
Article in Spanish | MEDLINE | ID: mdl-16180326

ABSTRACT

Incrusted cystitis is an infrequent process characterized by precipitation an incrustation of salts on the vesical mucosa. An alkanine urine is required to this precipitation. The urinary infection with urolithic activity microorganisms can also be a very important factor. We present a case of incrusted cystitis after using Mitomicine as vesical chemotherapy.


Subject(s)
Alkylating Agents/adverse effects , Cystitis/chemically induced , Mitomycin/adverse effects , Alkylating Agents/administration & dosage , Cystitis/pathology , Cystitis/surgery , Humans , Male , Middle Aged , Mitomycin/administration & dosage , Treatment Outcome , Urinary Bladder/drug effects , Urinary Bladder/pathology , Urinary Bladder/surgery , Urologic Surgical Procedures
14.
Actas urol. esp ; 29(7): 715-718, jul.-ago. 2005. ilus
Article in Es | IBECS | ID: ibc-039319

ABSTRACT

La cistitis incrustante o incrustada es un proceso frecuente que se caracteriza por la precipitación de sales en la mucosa vesical. La presencia de orinas alcalinas parece ser un factor fundamental para dicho depósito. Las infecciones urinarias por gérmenes urealíticos también parece ser un factor importante. Presentamos un caso de cistitis incrustante tras el uso de Mitomicina C como quimioterápico intravesical (AU)


Incrusted cystitis is an infrecuent process characterized by precipitation an incrustation of salts on the vesical mucosa. An alkanine urine is required to this precipitation. The urinary infection with urolithic activity microorganisms can also be a very important factor. We present a case of incrusted cystitis after using Mitomicine as vesical chemotherapy (AU)


Subject(s)
Male , Middle Aged , Humans , Mitomycin/adverse effects , Cystitis/chemically induced , Urinary Bladder Neoplasms/complications , Administration, Intravesical , Risk Factors , Neoplasm Recurrence, Local/drug therapy
15.
Microbiology (Reading) ; 150(Pt 12): 3947-57, 2004 Dec.
Article in English | MEDLINE | ID: mdl-15583148

ABSTRACT

The Yersinia pseudotuberculosis chromosome contains a seven-gene polycistronic unit (the pmrF operon) whose products share extensive homologies with their pmrF counterparts in Salmonella enterica serovar Typhimurium (S. typhimurium), another Gram-negative bacterial enteropathogen. This gene cluster is essential for addition of 4-aminoarabinose to the lipid moiety of LPS, as demonstrated by MALDI-TOF mass spectrometry of lipid A from both wild-type and pmrF-mutated strains. As in S. typhimurium, 4-aminoarabinose substitution of lipid A contributes to in vitro resistance of Y. pseudotuberculosis to the antimicrobial peptide polymyxin B. Whereas pmrF expression in S. typhimurium is mediated by both the PhoP-PhoQ and PmrA-PmrB two-component regulatory systems, it appears to be PmrA-PmrB-independent in Y. pseudotuberculosis, with the response regulator PhoP interacting directly with the pmrF operon promoter region. This result reveals that the ubiquitous PmrA-PmrB regulatory system controls different regulons in distinct bacterial species. In addition, pmrF inactivation in Y. pseudotuberculosis has no effect on bacterial virulence in the mouse, again in contrast to the situation in S. typhimurium. The marked differences in pmrF operon regulation in these two phylogenetically close bacterial species may be related to their dissimilar lifestyles.


Subject(s)
Anti-Bacterial Agents/pharmacology , Bacterial Proteins/metabolism , Gene Expression Regulation, Bacterial , Operon , Polymyxins/pharmacology , Yersinia pseudotuberculosis/pathogenicity , Animals , Animals, Outbred Strains , Bacterial Proteins/genetics , Drug Resistance, Bacterial/genetics , Female , Mice , Microbial Sensitivity Tests , Molecular Sequence Data , Sequence Analysis, DNA , Transcription Factors/genetics , Transcription Factors/metabolism , Up-Regulation , Virulence , Yersinia pseudotuberculosis/drug effects , Yersinia pseudotuberculosis/genetics , Yersinia pseudotuberculosis Infections/microbiology , Yersinia pseudotuberculosis Infections/physiopathology
16.
FEMS Immunol Med Microbiol ; 38(2): 97-106, 2003 Sep 22.
Article in English | MEDLINE | ID: mdl-13129643

ABSTRACT

The O-antigen of lipopolysaccharide (LPS) is required for virulence in Yersinia enterocolitica serotype O:8. Here we evaluated the importance of controlling the O-antigen biosynthesis using an in vivo rabbit model of infection. Y. enterocolitica O:8 wild-type strain was compared to three mutants differing in the O-antigen phenotype: (i) the rough strain completely devoid of the O-antigen, (ii) the wzy strain that lacks the O-antigen polymerase (Wzy protein) and expresses LPS with only one repeat unit, and (iii) the wzz strain that lacks the O-antigen chain length determinant (Wzz protein) and expresses LPS without modal distribution of O-antigen chain lengths. The most attenuated strain was the wzz mutant. The wzz bacteria were cleared from the tissues by day 30, the blood parameters were least dramatic and histologically only immunomorphological findings were seen. The level of attenuation of the rough and the wzy strain bacteria was between the wild-type and the wzz strain. Wild-type bacteria were highly resistant to killing by polymorphonuclear leukocytes, the wzz strain bacteria were most sensitive and the rough and wzy strain bacteria were intermediate resistant. These results clearly demonstrated that the presence of O-antigen on the bacterial surface is not alone sufficient for full virulence, but also there is a requirement for its controlled chain length.


Subject(s)
Disease Models, Animal , O Antigens/metabolism , Yersinia Infections/microbiology , Yersinia enterocolitica/pathogenicity , Animals , Blood Bactericidal Activity , Gene Expression Regulation, Bacterial , Hexosyltransferases/genetics , Hexosyltransferases/metabolism , Mouth/microbiology , Mutation , Neutrophils/immunology , O Antigens/genetics , Rabbits , Virulence , Yersinia Infections/physiopathology , Yersinia enterocolitica/genetics , Yersinia enterocolitica/immunology , Yersinia enterocolitica/metabolism
17.
Infect Immun ; 71(4): 2014-21, 2003 Apr.
Article in English | MEDLINE | ID: mdl-12654821

ABSTRACT

Pathogenic biotypes of Yersinia enterocolitica (serotypes O:3, O:8, O:9, and O:13), but not environmental biotypes (serotypes O:5, O:6, O:7,8, and O:7,8,13,19), increased their permeability to hydrophobic probes when they were grown at pH 5.5 or in EGTA-supplemented (Ca(2+)-restricted) media at 37 degrees C. A similar observation was also made when representative strains of serotypes O:8 and O:5 were tested after brief contact with human monocytes. The increase in permeability was independent of the virulence plasmid. The role of lipopolysaccharide (LPS) in this phenomenon was examined by using Y. enterocolitica serotype O:8. LPS aggregates of bacteria grown in acidic or EGTA-supplemented broth took up more N-phenylnaphthylamine than LPS aggregates of bacteria grown in standard broth and also showed a marked increase in acyl chain fluidity which correlated with permeability, as determined by measurements obtained in the presence of hydrophobic dyes. No significant changes in O-antigen polymerization were observed, but lipid A acylation changed depending on the growth conditions. In standard medium at 37 degrees C, there were hexa-, penta-, and tetraacyl lipid A forms, and the pentaacyl form was dominant. The amount of tetraacyl lipid A increased in EGTA-supplemented and acidic media, and hexaacyl lipid A almost disappeared under the latter conditions. Our results suggest that pathogenic Y. enterocolitica strains modulate lipid A acylation coordinately with expression of virulence proteins, thus reducing LPS packing and increasing outer membrane permeability. The changes in permeability, LPS acyl chain fluidity, and lipid A acylation in pathogenic Y. enterocolitica strains approximate the characteristics in Yersinia pseudotuberculosis and Yersinia pestis and suggest that there is a common outer membrane pattern associated with pathogenicity.


Subject(s)
Bacterial Outer Membrane Proteins/metabolism , Environmental Microbiology , Lipid A/chemistry , Lipopolysaccharides/metabolism , Yersinia enterocolitica/pathogenicity , Acylation , Amines/chemistry , Amines/pharmacology , Anti-Bacterial Agents/pharmacology , Cell Membrane Permeability , Culture Media , Environment , Humans , Monocytes/immunology , Novobiocin/pharmacology , Yersinia enterocolitica/growth & development , Yersinia enterocolitica/physiology
18.
Actas Urol Esp ; 25(8): 589-90, 2001 Sep.
Article in Spanish | MEDLINE | ID: mdl-11692804

ABSTRACT

We report one case of cavernous hemangioma of penis shaft appeared in a 35 years old man like a painful mass. The blood analysis and radiologics examinations hadn't any important contribution to the diagnostic that, finally, was confirmed during the surgical extirpation and the posterior histological study. We make a brief description about the mentioned pathology.


Subject(s)
Hemangioma, Cavernous/diagnosis , Penile Neoplasms/diagnosis , Adult , Hemangioma, Cavernous/surgery , Humans , Male , Penile Neoplasms/surgery
19.
Actas urol. esp ; 25(10): 720-723, nov. 2001.
Article in Es | IBECS | ID: ibc-6162

ABSTRACT

OBJETIVO: Comunicar una modificación técnica de uretrocistopexia, consistente en la suspensión de los ligamentos uretropélvicos a la cara posterior del hueso púbico mediante la utilización de anclajes óseos insertados con el sistema In-Fast. MATERIAL Y METODOS: Entre Agosto de 2000 y Enero de 2001, trece pacientes con una edad media de 56,1 años fueron sometidas a dicha técnica. Usando una vía transvaginal y tras amplia apertura de la fascia endopélvica, colocamos un tornillo de anclaje a cada lado de la sínfisis púbica, dando posteriormente 2 ó 3 pasadas al ligamento uretropélvico con la sutura de polipropileno del nº 1 que cada uno de ellos lleva unido a su extremo. RESULTADOS: La estancia media ha sido de 5,1 días. La cistostomía se ha mantenido durante una media de 10,1 días. No se observaron complicaciones intra ni postoperatorias. Con un seguimiento medio de 5,3 meses todas las pacientes presentan desaparición de su incontinencia de esfuerzo. CONCLUSIONES: A falta de confirmar con un mayor seguimiento y casuística, la suspensión de los ligamentos uretropélvicos mediante anclajes directamente colocados en el hueso púbico por vía vaginal, se ha mostrado como un método sencillo, seguro y altamente confortable para las pacientes (AU)


Subject(s)
Female , Humans , Urologic Surgical Procedures , Urinary Incontinence, Stress , Pubic Bone
20.
Actas urol. esp ; 25(8): 589-590, sept. 2001.
Article in Es | IBECS | ID: ibc-6140

ABSTRACT

Presentamos un caso de hemangioma cavernoso de raíz de pene, aparecido en un varón de 35 años en forma de una masa dolorosa. Los estudios analíticos y radiológicos no tuvieron una aportación importante al diagnóstico que, finalmente, se confirmó durante la exéresis quirúrgica y el posterior estudio histológico (AU)


Subject(s)
Adult , Male , Humans , Hemangioma, Cavernous , Penile Neoplasms
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