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1.
Support Care Cancer ; 28(11): 5213-5221, 2020 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-32078059

RESUMO

Cancer-related fatigue (CRF) is one of the most prolonged discomforts suffered by people who have had cancer. Seventy-eight to ninety-six percent of cancer patients experience fatigue, especially while undergoing treatment. CRF is related to insomnia, anxiety, depression, and also varies depending on age. However, little is known about the factors contributing to CRF and better understanding of determinants of CRF makes it easier to identify early patients at risk and in designing intervention planning. The aim of this study was to assess the influence of precipitating factors (diagnosis of breast cancer and other clinical aspects) and perpetuating factors (social network, quality of life, mental disorders) on the presence of chronic fatigue in women from our cultural context, by social class each other determinants. METHODS: It was carried out a mixed cohort study (prospective and retrospective) using a convenience sample of women diagnosed with breast cancer. The information sources were data from the Brief Fatigue Inventory questionnaire and hospital medical records. The dependent variable was fatigue and the independent variables were age, social class, time since diagnoses, cohabitation, comorbidity, relapse, body mass index, mental health (anxiety and depression), social network, social support, and quality of life. RESULTS: Seventy-two percent of the women in the DAMA cohort reported moderate to severe fatigue. Risk of suffering from severe fatigue was greatest among individuals with low social class, those aged under 50 years, those with chronic disorders who had relapsed, and those with symptoms of anxiety and depression. In our study, CRF did not appear to be related to the stage of the cancer at diagnosis, or to the time since diagnosis. CONCLUSIONS: CRF is an element that the professionals responsible for the control and monitoring of women should take into account as another element to be taken into consideration.


Assuntos
Neoplasias da Mama/epidemiologia , Fadiga/epidemiologia , Idoso , Ansiedade/epidemiologia , Ansiedade/psicologia , Neoplasias da Mama/psicologia , Estudos de Coortes , Fadiga/psicologia , Feminino , Humanos , Pessoa de Meia-Idade , Análise Multivariada , Recidiva Local de Neoplasia , Estudos Prospectivos , Qualidade de Vida , Estudos Retrospectivos , Apoio Social , Fatores Socioeconômicos , Espanha/epidemiologia , Inquéritos e Questionários
2.
Clin Transl Oncol ; 22(6): 943-952, 2020 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-31586294

RESUMO

OBJECTIVE: To validate the Catalan minimum basic data set (MBDS) of hospital discharges as an information source for detecting incident breast (BC) and colorectal cancer (CRC), against the Hospital del Mar Cancer Registry (RTHMar) in Barcelona (Spain) as the gold standard. METHODS: Using ASEDAT software (Analysis, Selection and Extraction of Tumour Data), we identified Catalan public hospital discharge abstracts in patients with a first-time diagnosis of BC and CRC in the years 2005, 2008, and 2011, aggregated by unique patient identifiers and sorted by date. Once merged with the RTHMar database and anonymized, tumour-specific algorithms were validated to extract data on incident cases, tumour stage, surgical treatment, and date of incidence. RESULTS: MBDS had a respective sensitivity and positive predictive value (PPV) of 78.0% (564/723) and 90.5% (564/623) for BC case detection; and 83.9% (387/461) and 94.9% (387/408) for CRC case detection. The staging algorithms overestimated the proportion of local-stage cases and underestimated the regional-stage cases in both cancers. When loco-regional stage and surgery were combined, sensitivity and PPV reached 98.3% and 99.8%, respectively, for BC and 96.4% and 98.4% for CRC. The differences between dates of incidence between RTHMar and MBDS were greater for BC cases without initial surgery, whereas they were generally smaller and homogeneous for CRC cases. CONCLUSIONS: The MBDS is a valid and efficient instrument to improve the completeness of a hospital-based cancer registry (HBCR), particularly in BC and CRC, which require hospitalization and are predominantly surgical.


Assuntos
Neoplasias da Mama/epidemiologia , Neoplasias Colorretais/epidemiologia , Bases de Dados Factuais , Hospitalização/estatística & dados numéricos , Algoritmos , Neoplasias da Mama/diagnóstico , Neoplasias da Mama/patologia , Neoplasias da Mama/terapia , Neoplasias Colorretais/diagnóstico , Neoplasias Colorretais/patologia , Neoplasias Colorretais/terapia , Hospitais Públicos , Humanos , Incidência , Sistema de Registros , Espanha/epidemiologia
3.
Cancer Epidemiol ; 55: 123-129, 2018 08.
Artigo em Inglês | MEDLINE | ID: mdl-29940418

RESUMO

BACKGROUND: Anxiety and depression are the most prevalent mental health pathologies among women with breast cancer. Social, clinical and contextual variables may influence emotional stress among women with breast cancer. The aim of this work is to study anxiety and depression in a cohort of women diagnosed with breast cancer between 2003 and 2013 in Barcelona. We evaluate social and clinical determinants. METHODS: We performed a mixed cohort study (prospective and retrospective) using a convenience sample of women diagnosed with breast cancer. The information sources were the Hospital Anxiety and Depression questionnaire and hospital medical records. Dependent variables were anxiety and depression; independent variables were social class, age, employment status, tumour stage at diagnosis, time since diagnosis, social network and social support. We performed a descriptive analysis, a bivariate analysis, and a multivariate logistic regression analysis. RESULTS: A total of 1086 (48.6%) women had some degree of anxiety-related problem. As for depression. In the case of depression, 225 (15%) women had some degree of depression-related problem. Low emotional support and social isolation were clear risk factors for having more anxiety and depression. Low social class was also a risk factor, and age also played a role. DISCUSSION: Our results show that women long period of cancer survival have high prevalences of anxiety than depression, and this prevalence of anxiety is higher than the general population. In addition, we found inequalities between social classes and the isolation and social support are worse too in low social class.


Assuntos
Transtornos de Ansiedade/etiologia , Transtornos de Ansiedade/prevenção & controle , Neoplasias da Mama/psicologia , Transtorno Depressivo/etiologia , Transtorno Depressivo/prevenção & controle , Rede Social , Apoio Social , Adaptação Psicológica , Idoso , Neoplasias da Mama/complicações , Feminino , Humanos , Pessoa de Meia-Idade , Prevalência , Estudos Prospectivos , Estudos Retrospectivos , Fatores de Risco , Inquéritos e Questionários
4.
Rev Calid Asist ; 29(4): 237-44, 2014.
Artigo em Espanhol | MEDLINE | ID: mdl-24985242

RESUMO

OBJECTIVES: Hospital cancer registries and hospital databases are valuable and efficient sources of information for research into cancer recurrences. The aim of this study was to develop and validate algorithms for the detection of breast cancer recurrence. METHODS: A retrospective observational study was conducted on breast cancer cases from the cancer registry of a third level university hospital diagnosed between 2003 and 2009. Different probable cancer recurrence algorithms were obtained by linking the hospital databases and the construction of several operational definitions, with their corresponding sensitivity, specificity, positive predictive value and negative predictive value. RESULTS: A total of 1,523 patients were diagnosed of breast cancer between 2003 and 2009. A request for bone gammagraphy after 6 months from the first oncological treatment showed the highest sensitivity (53.8%) and negative predictive value (93.8%), and a pathology test after 6 months after the diagnosis showed the highest specificity (93.8%) and negative predictive value (92.6%). The combination of different definitions increased the specificity and the positive predictive value, but decreased the sensitivity. CONCLUSIONS: Several diagnostic algorithms were obtained, and the different definitions could be useful depending on the interest and resources of the researcher. A higher positive predictive value could be interesting for a quick estimation of the number of cases, and a higher negative predictive value for a more exact estimation if more resources are available. It is a versatile and adaptable tool for other types of tumors, as well as for the needs of the researcher.


Assuntos
Algoritmos , Neoplasias da Mama/diagnóstico , Recidiva Local de Neoplasia/diagnóstico , Bases de Dados Factuais , Feminino , Registros Hospitalares , Humanos , Estudos Retrospectivos , Sensibilidade e Especificidade
5.
Rev Calid Asist ; 29(4): 188-96, 2014.
Artigo em Espanhol | MEDLINE | ID: mdl-25002239

RESUMO

OBJECTIVE: To evaluate the impact of a mobile phone short message on women's uptake in a breast cancer screening programme. METHODS: A total of 703 women from a Basic Health Area of Barcelona, and with a mobile phone number registered, were invited to participate in a breast cancer screening programme between 25 January 2011 and 22 March 2011. The control group (n=470) followed the usual appointment track, and the intervention group (n=233) received, after the first letter of invitation, a mobile phone short message reminder. The differences between the two groups were analysed, comparing the uptake rates according to age, educational level, and participation in previous round, as well as the number of re-invitation calls to non-attenders according to uptake, age and level of education;and the percentages of exclusions of both groups. RESULTS: The intervention group had a greater uptake than the control group (78.1% vs. 72.3%), with a significant trend observed in the 55-59 years age group (P=.036) and the low secondary educational level (P=.014).The intervention group mean of re-invitation calls of non-attenders lower than the control group (.41 vs. .65, P<.05), a pattern observed in all the categories of the independent variables, and among younger age groups, lower and middle educational levels, and previously participating women (.09 vs. .19, P=.012). CONCLUSIONS: The inclusion of a mobile phone short message in a breast cancer screening programme may increase uptake rates and lead to a management improvement.


Assuntos
Neoplasias da Mama/diagnóstico , Detecção Precoce de Câncer , Aceitação pelo Paciente de Cuidados de Saúde/estatística & dados numéricos , Envio de Mensagens de Texto , Idoso , Algoritmos , Feminino , Humanos , Pessoa de Meia-Idade
6.
Breast ; 22(1): 83-8, 2013 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-23141024

RESUMO

AIMS OF THE STUDY: The Gail Model (GM) is the most well-known model to assess the individual risk of breast cancer (BC). Although its discriminatory accuracy is low in the clinical context, its usefulness in the screening setting is not well known. The aim of this study is to assess the utility of the GM in a European screening program. METHODS: Retrospective cohort study of 2200 reassessed women with information on the GM available in a BC screening program in Barcelona, Spain. The 5 year-risk of BC applying the GM right after the screening mammogram was compared first with the actual woman's risk of BC in the same screening round and second with the BC risk during the next 5 years. RESULTS: The curves of BC Gail risk overlapped for women with and without BC, both in the same screening episode as well as 5 years afterward. Overall sensitivity and specificity in the same screening episode were 22.3 and 86.5%, respectively, and 46.2 and 72.1% 5 years afterward. ROC curves were barely over the diagonal and the concordance statistics were 0.59 and 0.61, respectively. CONCLUSION: The GM has very low accuracy among women with a positive mammogram result, predicting BC both in the concomitant episode and 5 years later. Our results do not encourage the use of the GM in the screening context to aid the referral decision or the type of procedures after a positive mammogram or to identify women at high risk among those with a false-positive outcome.


Assuntos
Neoplasias da Mama/diagnóstico , Técnicas de Apoio para a Decisão , Detecção Precoce de Câncer/métodos , Mamografia , Idoso , Algoritmos , Neoplasias da Mama/diagnóstico por imagem , Estudos de Coortes , Reações Falso-Positivas , Feminino , Seguimentos , Humanos , Modelos Logísticos , Pessoa de Meia-Idade , Valor Preditivo dos Testes , Curva ROC , Estudos Retrospectivos , Medição de Risco , Sensibilidade e Especificidade , Espanha
7.
Br J Radiol ; 85(1019): 1465-70, 2012 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-22993385

RESUMO

OBJECTIVE: The aim of this study was to evaluate reader variability in screening mammograms according to the American College of Radiology Breast Imaging Reporting and Data System (BI-RADS) assessment and breast density categories. METHODS: A stratified random sample of 100 mammograms was selected from a population-based breast cancer screening programme in Barcelona, Spain: 13 histopathologically confirmed breast cancers and 51 with true-negative and 36 with false-positive results. 21 expert radiologists from radiological units of breast cancer screening programmes in Catalonia, Spain, reviewed the mammography images twice within a 6-month interval. The readers described each mammography using BI-RADS assessment and breast density categories. Inter- and intraradiologist agreement was assessed using percentage of concordance and the kappa (κ) statistic. RESULTS: Fair interobserver agreement was observed for the BI-RADS assessment [κ=0.37, 95% confidence interval (CI) 0.36-0.38]. When the categories were collapsed in terms of whether additional evaluation was required (Categories III, 0, IV, V) or not (I and II), moderate agreement was found (κ=0.53, 95% CI 0.52-0.54). Intra-observer agreement for BI-RADS assessment was moderate using all categories (κ=0.53, 95% CI 0.50-0.55) and substantial on recall (κ=0.66, 95% CI 0.63-0.70). Regarding breast density, inter- and intraradiologist agreement was substantial (κ=0.73, 95% CI 0.72-0.74 and κ=0.69, 95% CI 0.68-0.70, respectively). CONCLUSION: We observed a substantial intra-observer agreement in the BI-RADS assessment but only moderate interobserver agreement. Both inter- and intra-observer agreement in mammographic interpretation of breast density was substantial. Advances in knowledge Educational efforts should be made to decrease radiologists' variability in BI-RADS assessment interpretation in population-based breast screening programmes.


Assuntos
Neoplasias da Mama/diagnóstico por imagem , Mamografia/normas , Variações Dependentes do Observador , Densidade da Mama , Feminino , Humanos , Glândulas Mamárias Humanas/anormalidades , Pessoa de Meia-Idade
8.
Prog Urol ; 19(13): 988-93, 2009 Dec.
Artigo em Francês | MEDLINE | ID: mdl-19969269

RESUMO

UNLABELLED: Abdominal sacrofixation is the gold standard for the treatment of the prolapse. There are many ways to do it: technical, meshes, dissection, fixation of the mesh, associated procedures. Laparotomy is the classical procedure for sacrofixation. The basis of sacrofixation is to dissect the weak vesicovaginal and rectovaginal fascias and to replace with meshes spread out on the entire dissected surface. PROCEDURE: Suprapubic abdominal incision, dissection of the anterior vertebral ligament on the right of the promontory, dissection of the vesicovaginal and rectovaginal spaces; meshes are fixed anteriorly on the vagina, posteriorly on the levator ani and uterosacral ligaments. The peritoneum on the meshes is carefully closed to avoid later ileus. RESULTS: Redux is globally 10% (74-98%); the redux occur in the two years. Meshes exposure, spondilodiscitis, ileus are uncommon. In comparison with the vaginal procedures, there is less redux, less dyspareunia. But the drawbacks are postoperative pains, scars, eventration, low dissection difficult and some contraindications to the abdominal sacrofixation: respiratory insufficiency, morbid obesity, multi-operated abdomen, ascitis, aortoiliac aneurysms.


Assuntos
Laparoscopia , Prolapso de Órgão Pélvico/cirurgia , Feminino , Procedimentos Cirúrgicos em Ginecologia/métodos , Humanos , Procedimentos Cirúrgicos Urológicos/métodos
10.
Arch Bronconeumol ; 41(6): 307-12, 2005 Jun.
Artigo em Espanhol | MEDLINE | ID: mdl-15989887

RESUMO

OBJECTIVE: To describe the clinical, histological, and epidemiological characteristics of patients diagnosed with lung cancer in our hospital over a period of 5 years and compare them with those of historical cases treated at the same hospital. PATIENTS AND METHODS: The cases of patients diagnosed with lung cancer from January 1998 through December 2002 were studied retrospectively and compared with data published for the period from 1978 through March 1981. RESULTS: A total of 678 patients (89% men, mean age 67 years) were studied. Fifty-six percent of the men and 38% of the women were smokers (P<.001). The most common histological types were squamous cell carcinoma (33%) and adenocarcinoma (30%): squamous carcinoma in men (36%) and adenocarcinoma in women (56%). Metastasis was present in 42% of the patients with non-small cell lung cancer and in 55% of those with small cell lung cancer. In patients with a history of neoplastic disease, laryngeal tumors were most common in patients with squamous carcinoma whereas bladder tumors were the most frequent in patients with adenocarcinoma. The ratio of men to women was lower in the recent series than in the historical one. The percentage of squamous carcinoma was lower and that of adenocarcinoma higher (P<.001). The percentage of patients diagnosed with regional involvement was greater in the recent series (P<.001). CONCLUSIONS: Squamous cell carcinoma continues to be the most frequent histological type. Male sex and smoking are associated with squamous carcinoma and female sex is associated with adenocarcinoma. Epidemiological and histological patterns have changed, possibly in relation to changes in smoking habits.


Assuntos
Hospitais Universitários/estatística & dados numéricos , Neoplasias Pulmonares/epidemiologia , Adenocarcinoma/epidemiologia , Adenocarcinoma/patologia , Idoso , Idoso de 80 Anos ou mais , Carcinoma Pulmonar de Células não Pequenas/epidemiologia , Carcinoma Pulmonar de Células não Pequenas/patologia , Carcinoma de Células Pequenas/epidemiologia , Carcinoma de Células Pequenas/patologia , Carcinoma de Células Escamosas/epidemiologia , Carcinoma de Células Escamosas/patologia , Estudos de Coortes , Feminino , Humanos , Neoplasias Laríngeas/epidemiologia , Neoplasias Pulmonares/patologia , Masculino , Pessoa de Meia-Idade , Neoplasias Primárias Múltiplas/epidemiologia , Estudos Retrospectivos , Fatores de Risco , Fumar/epidemiologia , Fumar/tendências , Espanha/epidemiologia , Neoplasias da Bexiga Urinária/epidemiologia
11.
Eur J Cancer Prev ; 11(3): 209-13, 2002 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-12131653

RESUMO

We assessed the effect of two different methods of contacting the target population on the rate of participation in a colorectal cancer screening programme. All individuals aged between 50 and 74 years enlisted in one primary health care centre in Barcelona (Spain) were included in a prospective randomized controlled trial. An invitation letter signed by a doctor together with two containers for faecal sample collection were sent by post to subjects in the 'standard' group (n = 1060), while subjects in the 'study' group (direct contact, n = 965) were visited by a trained non-health professional who supplied them with the same documentation as the standard group. The screening test consisted of an immunological method for the detection of faecal blood which does not require any prior specific dietary measures. Specimens were collected on two successive days. A significantly higher participation was observed in the study group (557/965, 57.7%) compared with the standard group (388/1060, 36.5%, P < 0.005). Specimen collection correctness was also higher in the study group (419/557, 75.1%) compared with the standard group (262/388, 67.5%, P < 0.014). There were no differences in terms of either age group or sex for the participation, nor for degree of correctness of specimen collection. Participation and specimen collection can be raised in colorectal cancer screening programmes by means of an invitation made through direct contact by a suitably trained non-health professional.


Assuntos
Neoplasias Colorretais/prevenção & controle , Necessidades e Demandas de Serviços de Saúde , Programas de Rastreamento/métodos , Idoso , Métodos Epidemiológicos , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Estudos Prospectivos , Espanha
12.
Eur J Neurosci ; 15(8): 1353-62, 2002 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-11994129

RESUMO

Recent data suggest that a decreased basal ganglia output may occur in dystonia, resulting in an increased thalamic drive to the mesial premotor cortex. In a previous work we found that injection of the GABAA antagonist bicuculline into the rostral motor thalamus induced contralateral dystonic postures, whereas myoclonic jerks were frequent after injection into the caudal motor thalamus. In the present study, we performed electrophysiological recordings in the rostral and caudal parts of the ventrolateral thalamus of two cynomolgus monkeys before and after bicuculline injections or saline injections. Discharge frequencies of thalamic neurons were increased after bicuculline injections vs. controls. Their discharge pattern was more bursty in the caudal part in which bursts of neuronal activity were correlated with myoclonic jerks. After bicuculline injection, neurons responded more frequently and less selectively to passive limb movements in both parts of the motor thalamus. Conversely, the response to microstimulation increased after bicuculline injection, particularly in the caudal part. Our data show that acute bicuculline-induced dystonia is associated with a reversible overactivity and disorganization of neuronal activity in the motor thalamus. Such a phenomenon might induce an overspreading of cortical activity leading to dystonia. We postulate that the distinct clinical syndromes observed after bicuculline injections into the rostral and caudal motor thalamus are due to differences both in the neuronal circuitry within each thalamic nucleus and in segregated cortical projections.


Assuntos
Potenciais de Ação/fisiologia , Distonia/fisiopatologia , Macaca fascicularis/fisiologia , Córtex Motor/fisiopatologia , Vias Neurais/fisiopatologia , Neurônios/fisiologia , Núcleos Ventrais do Tálamo/fisiopatologia , Potenciais de Ação/efeitos dos fármacos , Animais , Comportamento Animal/efeitos dos fármacos , Comportamento Animal/fisiologia , Bicuculina/farmacologia , Modelos Animais de Doenças , Distonia/induzido quimicamente , Distonia/patologia , Estimulação Elétrica , Feminino , Antagonistas GABAérgicos/farmacologia , Antagonistas de Receptores de GABA-A , Macaca fascicularis/anatomia & histologia , Córtex Motor/efeitos dos fármacos , Córtex Motor/patologia , Inibição Neural/efeitos dos fármacos , Inibição Neural/fisiologia , Vias Neurais/efeitos dos fármacos , Vias Neurais/patologia , Neurônios/efeitos dos fármacos , Receptores de GABA-A/metabolismo , Núcleos Ventrais do Tálamo/efeitos dos fármacos , Núcleos Ventrais do Tálamo/patologia
13.
Prev Med ; 33(4): 325-32, 2001 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-11570837

RESUMO

BACKGROUND: The objective of this study was to compare the response received by a population-based breast cancer screening program, according to three different invitation strategies: letters sent by mail from the program (program group), letters sent by mail from the Primary Health Care Team (PHT group), and direct contact through a trained professional (direct contact group). METHODS: We used a cluster-randomized controlled trial with assignment to invitation group using home address. Nine hundred eighty-six women of Barcelona (Spain), ages 50 to 64 years, were invited to participate in the program. The main outcome used was the response rate after the first invitation. RESULTS: Five hundred sixty-four women accepted the invitation (57.2%). The highest response rate was achieved in the direct contact group (63.5%), followed by the PHT group (55.6%), the program group being the one that attained the lowest response rate (52.1%). The direct contact group had a higher probability of participating than the PHT group (RR = 1.14, P = 0.037) or the program group (RR = 1.22, P = 0.003). The response rate in the direct contact group was 72.1% when the letter was received by the subject herself. The increase in response occurred particularly among women of lower educational level. CONCLUSIONS: Inviting women to participate in a breast cancer screening program through direct contact by trained personnel increased participation rate compared with mailed-letter methods. The positive effect appeared restricted to women with lower educational levels.


Assuntos
Neoplasias da Mama/prevenção & controle , Mamografia/estatística & dados numéricos , Marketing de Serviços de Saúde/métodos , Aceitação pelo Paciente de Cuidados de Saúde/estatística & dados numéricos , Comunicação Persuasiva , Educação , Feminino , Humanos , Modelos Logísticos , Pessoa de Meia-Idade , Serviços Postais , Áreas de Pobreza , Relações Profissional-Paciente , Risco , Espanha
14.
J Biol Chem ; 276(22): 19190-6, 2001 Jun 01.
Artigo em Inglês | MEDLINE | ID: mdl-11279129

RESUMO

The Arabidopsis thaliana flavoprotein AtHAL3a is related to plant growth and salt and osmotic tolerance. AtHAL3a shows sequence homology to the bacterial flavoproteins EpiD and Dfp. EpiD, Dfp, and AtHAL3a are members of the homo-oligomeric flavin-containing Cys decarboxylase (HFCD) protein family. We demonstrate that AtHAL3a catalyzes the decarboxylation of (R)-4'-phospho-N-pantothenoylcysteine to 4'-phosphopantetheine. This key step in coenzyme A biosynthesis is catalyzed in bacteria by the Dfp proteins. Exchange of His-90 of AtHAL3a for Asn led to complete inactivation of the enzyme. Dfp and AtHAL3a are characterized by a shortened substrate binding clamp compared with EpiD. Exchange of the cysteine residue of the conserved ACGD motif of this binding clamp resulted in loss of (R)-4'-phospho-N-pantothenoylcysteine decarboxylase activity. Based on the crystal structures of EpiD H67N with bound substrate peptide and of AtHAL3a, we present a model for the binding of (R)-4'-phospho-N-pantothenoylcysteine to AtHAL3a.


Assuntos
Proteínas de Arabidopsis , Arabidopsis/química , Coenzima A/biossíntese , Cisteína/metabolismo , Panteteína/análogos & derivados , Panteteína/metabolismo , Ácido Pantotênico/metabolismo , Proteínas de Plantas/química , Proteínas de Plantas/metabolismo , Sequência de Aminoácidos , Sítios de Ligação , Carboxiliases/química , Catálise , Cromatografia em Gel , Cristalografia por Raios X , Cisteína/análogos & derivados , Cisteína/química , Eletroforese em Gel de Poliacrilamida , Immunoblotting , Modelos Químicos , Modelos Moleculares , Dados de Sequência Molecular , Complexos Multienzimáticos/química , Mutagênese Sítio-Dirigida , Mutação , Oxirredutases/química , Ácido Pantotênico/análogos & derivados , Peptídeo Sintases/química , Reação em Cadeia da Polimerase , Ligação Proteica , Conformação Proteica , Sais/metabolismo , Homologia de Sequência de Aminoácidos , Transdução de Sinais , Fatores de Tempo
15.
Structure ; 8(9): 961-9, 2000 Sep 15.
Artigo em Inglês | MEDLINE | ID: mdl-10986463

RESUMO

BACKGROUND: The Arabidopsis thaliana HAL3 gene product encodes for an FMN-binding protein (AtHal3) that is related to plant growth and salt and osmotic tolerance. AtHal3 shows sequence homology to ScHal3, a regulatory subunit of the Saccharomyces cerevisae serine/threonine phosphatase PPz1. It has been proposed that AtHal3 and ScHal3 have similar roles in cellular physiology, as Arabidopsis transgenic plants that overexpress AtHal3 and yeast cells that overexpress ScHal3 display similar phenotypes of improved salt tolerance. The enzymatic activity of AtHal3 has not been investigated. However, the AtHal3 sequence is homologous to that of EpiD, a flavoprotein from Staphylococcus epidermidis that recognizes a peptidic substrate and subsequently catalyzes the alpha, beta-dehydrogenation of its C-terminal cysteine residue. RESULTS: The X-ray structure of AtHal3 at 2 A resolution reveals that the biological unit is a trimer. Each protomer adopts an alpha/beta Rossmann fold consisting of a six-stranded parallel beta sheet flanked by two layers of alpha helices. The FMN-binding site of AtHal3 contains all the structural requirements of the flavoenzymes that catalyze dehydrogenation reactions. Comparison of the amino acid sequences of AtHal3, ScHal3 and EpiD reveals that a significant number of residues involved in trimer formation, the active site, and FMN binding are conserved. This observation suggests that ScHal3 and EpiD might also be trimers, having a similar structure and function to AtHal3. CONCLUSIONS: Structural comparisons of AtHal3 with other FMN-binding proteins show that AtHal3 defines a new subgroup of this protein family that is involved in signal transduction. Analysis of the structure of AtHal3 indicates that this protein is designed to interact with another cellular component and to subsequently catalyze the alpha,beta-dehydrogenation of a peptidyl cysteine. Structural data from AtHal3, together with physiological and biochemical information from ScHal3 and EpiD, allow us to propose a model for the recognition and regulation of AtHal3/ScHal3 cellular partners.


Assuntos
Proteínas de Arabidopsis , Arabidopsis/fisiologia , Proteínas de Plantas/química , Proteínas de Saccharomyces cerevisiae , Sequência de Aminoácidos , Arabidopsis/genética , Cristalografia por Raios X , Mononucleotídeo de Flavina/metabolismo , Proteínas Fúngicas/química , Modelos Moleculares , Dados de Sequência Molecular , Fosfoproteínas Fosfatases/química , Proteínas de Plantas/genética , Proteínas de Plantas/metabolismo , Estrutura Secundária de Proteína , Subunidades Proteicas , Saccharomyces cerevisiae/enzimologia , Alinhamento de Sequência , Homologia de Sequência de Aminoácidos , Transdução de Sinais
16.
J Clin Epidemiol ; 53(6): 595-603, 2000 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-10880778

RESUMO

Factors associated with the level of utilization of screening mammography as a preventive practice were analyzed prior to initiating a population-based breast cancer screening program. A questionnaire was used to collect information about screening mammography utilization during the last 4 years among women invited to enroll in the program. Sociodemographic and health factors, and health services utilization were studied. A screening mammography in the last 4 years had been performed on 59.3% of the 8867 women interviewed. The utilization of mammography was higher among women who were younger, had a higher education level, or had previous visits to a physician (P < 0.001). The variables more strongly associated with use of screening mammography were: visit to a gynecologist and performance of a pap smear. Also associated with the utilization of screening mammography were: personal history of breast pathology, family history of breast cancer, breast self-examination, and recent visit to a general practitioner. Self-perceived health presented an inverse relation with screening mammography use (P < 0.001). The use of screening mammography appears to have increased in recent years, although inequalities persist which the breast cancer screening programs help to modulate. Mammographic frequency only would be deemed appropriate by the European guidelines in fewer than one-half of the cases.


Assuntos
Neoplasias da Mama/diagnóstico por imagem , Mamografia/estatística & dados numéricos , Programas de Rastreamento/estatística & dados numéricos , Serviços Preventivos de Saúde/estatística & dados numéricos , Neoplasias da Mama/prevenção & controle , Escolaridade , Feminino , Humanos , Pessoa de Meia-Idade , Probabilidade , Espanha
17.
Plant J ; 19(1): 1-8, 1999 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-10417721

RESUMO

Protection against desiccation-induced injury, including damage by reactive oxygen species (ROS), is a necessary component of the genetic programmes active during late seed development. Likewise, protection against ROS respiration by-products is required during seed imbibition and germination. Late embryogenesis abundant (LEA) proteins are proposed to protect seed tissues against desiccation-induced damage. Specifically, the atypical Lea gene Per1 in barley (Hordeum vulgare L.) has been proposed to play a protective role in embryo and aleurone cells against free-radical damage during late seed development and early imbibition. PER1 represents a subgroup of the peroxiredoxin family of thiol-requiring anti-oxidants with one conserved cysteine residue (1-Cys), and displays in vitro anti-oxidant activity. In this work, we use antiserum generated against PER1 to study protein accumulation patterns as well as localization at the tissue, cellular and subcellular level. While previous studies have shown the Per1 transcript to be dormancy-related, we show here that the protein level is maintained in imbibed dormant seeds, but not in non-dormant seeds. Our data identify the location of this seed-specific peroxiredoxin as the nucleus of immature embryos and aleurone layers. Highest levels of protein are detected in nucleoli. In contrast, in mature imbibed dormant seeds, cytosolic levels are comparable to that of the nucleus. A putative nuclear localization signal (NLS) of bipartite nature was identified in the C-terminal end of the PER1 sequence. Protective roles for PER1 in seeds are discussed.


Assuntos
Núcleo Celular/química , Hordeum/química , Peroxidases , Proteínas de Plantas/metabolismo , Sequência de Aminoácidos , Hordeum/citologia , Hordeum/embriologia , Dados de Sequência Molecular , Sinais de Localização Nuclear , Peroxirredoxinas , Proteínas de Plantas/química , Sementes/química , Frações Subcelulares/metabolismo
18.
Plant Mol Biol ; 40(2): 355-63, 1999 May.
Artigo em Inglês | MEDLINE | ID: mdl-10412913

RESUMO

The maize abscisic acid (ABA)-responsive gene rab28 has been shown to be ABA-inducible in embryos and vegetative tissues, expression being mostly restricted to vascular elements during late embryogenesis. In the course of an expressed sequence tags (ESTs) programme, we have isolated an Arabidopsis thaliana gene, Atrab28, encoding the orthologue of maize rab28. The Atrab28 cDNA is 1090 bp long, including a poly(A)+ stretch, and encodes a polypeptide of 262 amino acids. Atrab28 antibody against the recombinant protein recognizes a polipeptide of about 30 kDa and pI 6, in close agreement with the predicted molecular mass and pI. As for maize rab28, expression studies with Atrab28 revealed high specificity for embryo tissues, transcription being stimulated by the transcriptional activator abi3. In contrast, Atrab28 was not induced in vegetative tissues by ABA, osmotic stress or dehydration. The expression of Atrab28 mRNA and the accumulation of Atrab28 protein was largely restricted to provascular tissues of mature embryos and in the seed coat outer tegument and embryo and silique epidermis, as revealed by in situ hybridization and immunocytochemistry with anti-Atrab28 antibodies.


Assuntos
Proteínas de Arabidopsis , Arabidopsis/genética , Proteínas de Plantas/genética , Ácido Abscísico/farmacologia , Sequência de Aminoácidos , Arabidopsis/química , Arabidopsis/embriologia , DNA Complementar/química , DNA Complementar/genética , Regulação da Expressão Gênica/efeitos dos fármacos , Regulação da Expressão Gênica no Desenvolvimento , Regulação da Expressão Gênica de Plantas , Genes de Plantas/genética , Imuno-Histoquímica , Hibridização In Situ , Dados de Sequência Molecular , Família Multigênica , Reguladores de Crescimento de Plantas/farmacologia , Proteínas de Plantas/metabolismo , RNA Mensageiro/genética , RNA Mensageiro/metabolismo , Alinhamento de Sequência , Análise de Sequência de DNA , Homologia de Sequência de Aminoácidos , Distribuição Tecidual , Fatores de Transcrição , Ativação Transcricional , Água/farmacologia
19.
Appl Environ Microbiol ; 64(10): 4028-34, 1998 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-9758836

RESUMO

Hydrophobins are small (length, about 100 +/- 25 amino acids), cysteine-rich, hydrophobic proteins that are present in large amounts in fungal cell walls, where they form part of the outermost layer (rodlet layer); sometimes, they can also be secreted into the medium. Different hydrophobins are associated with different developmental stages of a fungus, and their biological functions include protection of the hyphae against desiccation and attack by either bacterial or fungal parasites, hyphal adherence, and the lowering of surface tension of the culture medium to permit aerial growth of the hyphae. We identified and isolated a hydrophobin (fruit body hydrophobin 1 [Fbh1]) present in fruit bodies but absent in both monokaryotic and dikaryotic mycelia of the edible mushroom Pleurotus ostreatus. In order to study the temporal and spatial expression of the fbh1 gene, we determined the N-terminal amino acid sequence of Fbh1. We also synthesized and cloned the double-stranded cDNA corresponding to the full-length mRNA of Fbh1 to use it as a probe in both Northern blot and in situ hybridization experiments. Fbh1 mRNA is detectable in specific parts of the fruit body, and it is absent in other developmental stages.


Assuntos
Proteínas Fúngicas/biossíntese , Pleurotus/fisiologia , Agaricales , Sequência de Aminoácidos , Sequência de Bases , Northern Blotting , Membrana Celular/ultraestrutura , Clonagem Molecular , DNA Complementar , Escherichia coli , Proteínas Fúngicas/química , Proteínas Fúngicas/genética , Genes Fúngicos , Hibridização In Situ , Dados de Sequência Molecular , Pleurotus/genética , RNA Mensageiro/análise , Proteínas Recombinantes/análise , Proteínas Recombinantes/biossíntese , Proteínas Recombinantes/química , Transcrição Gênica
20.
Aten Primaria ; 21(2): 81-7, 1998 Feb 15.
Artigo em Espanhol | MEDLINE | ID: mdl-9608131

RESUMO

OBJECTIVE: To find the view of Primary Care doctors in relation to the need for a community programme of breast cancer screening, its effectiveness and the criteria underlying its application. DESIGN: Crossover study. SETTING: Municipal districts of Ciutat Vella and Sant Martí, Barcelona. PARTICIPANTS: General Practitioners (GPs) in the programme. INTERVENTION: A self-filled questionnaire. The questions sought the level of agreement with 11 statements concerning: importance as health problem, effectiveness of the programmes, target population and role of GP. Results were compared for: year of graduation, sex and type of centre. MEASUREMENTS AND MAIN RESULTS: Of 140 doctors, 110 (78.6%) replied. There was majority agreement with all the statements, especially so in: "Breast cancer is one of the three main causes of death in women in Barcelona"; "screening of 50-64-year old women should be recommended"; and "GPs must recommend screening to their patients". CONCLUSION: The replies to the questionnaire indicated agreement with the programme's basic orientation, except for including 40 to 49-year old women in the programme, which the programme did not propose. Hopefully, this consensus will help Primary Care professionals become involved in the screening programme.


Assuntos
Atitude do Pessoal de Saúde , Neoplasias da Mama/prevenção & controle , Medicina de Família e Comunidade , Atenção Primária à Saúde , Adulto , Estudos Cross-Over , Feminino , Humanos , Masculino , Programas de Rastreamento , Pessoa de Meia-Idade , Espanha , Inquéritos e Questionários
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