Your browser doesn't support javascript.
Mostrar: 20 | 50 | 100
Resultados 1 - 10 de 10
Filtrar
Mais filtros










Base de dados
Tipo de estudo
Intervalo de ano de publicação
1.
Orv Hetil ; 160(32): 1270-1278, 2019 Aug.
Artigo em Húngaro | MEDLINE | ID: mdl-31387373

RESUMO

Introduction: During recent decades, the perinatal mortality of extremely low-birth weight infants has decreased. An important task is to recognize complications of prematurity. Aim: We made an attempt to explore the relationship between complications of prematurity and neonatal hyperglycemia. Method: From 1 January 2014 to 31 December 2017, 188 infants with birth weight below 1000 g were admitted. For each infant, the frequencies of hyperglycemia (blood glucose >8.5 mmol/l), retinopathy of prematurity, intraventricular hemorrhage, and bronchopulmonary dysplasia were determined. Animal studies were performed in Sprague Dawley rats. Hyperglycemia was achieved by intraperitoneal injection of streptozotocin (100 mg/kg). On the 7th day of life, aorta sections were prepared and stained with hematoxylin eosin. Wall thickness was measured using QCapture Pro 7 image analysis software. Results: The mean ± SD gestational age and birth weight were 27.1 ± 2.2 weeks and 814.9 ± 151.9 g; 33 infants (17.5%) died. Hyperglycemia was confirmed in 62 cases (32.9%), and insulin treatment was given to 43 infants (22.8%). The gestational age and birth weight of the hyperglycemic infants were significantly lower (p<0.001), the incidence of severe retinopathy (p = 0.012) and the mortality of insulin-treated patients were higher (p = 0.02) than in normoglycemic infants. Among survivors (n = 155), we found by logistic regression analysis that hyperglycemia was a risk factor for severe retinopathy (p<0.001). In the rat model, neonatal hyperglycemia caused significant thickening of the aortic wall. Conclusion: Our studies indicate that hyperglycemia is common in extremely low birth-weight infants. Monitoring of these infants for retinopathy of prematurity, kidney dysfunction, and hypertension is recommended. Orv Hetil. 2019; 160(32): 1270-1278.


Assuntos
Diabetes Mellitus Experimental , Hiperglicemia , Recém-Nascido de Peso Extremamente Baixo ao Nascer , Doenças do Prematuro , Retinopatia da Prematuridade/etiologia , Animais , Peso ao Nascer , Displasia Broncopulmonar/epidemiologia , Hemorragia Cerebral Intraventricular/epidemiologia , Diabetes Mellitus Experimental/induzido quimicamente , Diabetes Mellitus Experimental/tratamento farmacológico , Feminino , Idade Gestacional , Humanos , Lactente , Recém-Nascido , Recém-Nascido de muito Baixo Peso , Gravidez , Ratos , Ratos Sprague-Dawley , Retinopatia da Prematuridade/epidemiologia
2.
Int Breastfeed J ; 14: 9, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-30792750

RESUMO

Background: Breast milk provides nutrition for infants and also contains a variety of bioactive factors that influence the development of the newborn. Human milk is a complex biological fluid that can be separated into different layers (water phase and lipid phase with its component water and lipid fractions). It can affect the developing human body along the whole length of the gastrointestinal tract, and through the circulation, its factors may reach every organ. Methods: In the present study, we analyzed milk samples collected monthly for 6 months from 16 mothers from the 4th week postpartum between 2014 and 2016 in Baranya County, Hungary. The 96 samples provided us information about the fluctuation of certain bioactive factors during the first 6 months of lactation. We investigated with Luminex technology the concentrations of several cytokines (CD40, Flt-3L), chemokines (MCP-1, RANTES, GRO, MIP-1ß, MDC, eotaxin, fractalkine), and epidermal growth factor (EGF). Paired t-tests and one-way ANOVA followed by Bonferroni post-hoc tests were used to compare the data. Results: We detected the presence of each bioactive factor in every layer of the milk samples during the first 6 months of breastfeeding in widespread concentration ranges. In the case of GRO, MIP-1ß, MDC, Flt-3L, fractalkine, and eotaxin, the concentrations were constant during the first 6 months of lactation. The water phase of human milk contained higher factor concentrations compared to both fractions of the lipid phase for most factors (except eotaxin and MIP-1ß). The concentrations of CD40, EGF, MCP-1, and RANTES in the first 3 months were significantly different compared to the values detected between 4th and 6th months. In the water phase, the level of MCP-1 was significantly decreased, while all of the other factors increased during the 4th through 6th months. We found significantly higher EGF, GRO, and RANTES levels in the water fraction compared to the lipid fraction of the lipid phase. Conclusions: The novel findings of this investigation were the presence of Flt-3L and MDC in all layers of breast milk, and nearly all bioactive factors in the lipid phase. Due to their widespread physiological effects these factors may have an essential role in organogenesis.

3.
Histopathology ; 70(2): 273-280, 2017 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-27501523

RESUMO

AIMS: The aims of this study were to investigate the potential of ß-catenin as a biomarker for predicting cancer-specific survival, and to find a reproducible mode of evaluation of immunohistochemistry. METHODS AND RESULTS: ß-Catenin expression was analysed by immunohistochemistry in a cohort of 488 patients with conventional renal cell carcinoma (RCC) operated on between 2000 and 2010. The association between ß-catenin expression and cancer-specific survival was assessed with univariate and multivariate Cox regression models in relation to conventional clinical pathological prognostic factors, and by Kaplan-Meier survival analysis with the log rank test. The univariate Cox regression model revealed an association of cytoplasmic ß-catenin positivity and pathological variables with cancer-specific death. The multivariate Cox regression model analysis of tumours without metastatic disease at the first presentation identified the T-classification (P < 0.001) and cytoplasmic ß-catenin positivity as risk factors for postoperative tumour progression. Specifically, cytoplasmic ß-catenin expression was an independent factor indicating an unfavourable prognosis, with a four-fold higher risk of cancer-specific death (relative risk 4.017; 95% confidence interval 2.489-6.482; P < 0.001). The median survival time for patients with tumours showing cytoplasmic accumulation of ß-catenin was 48 months, whereas the overall survival time was 166 months. CONCLUSIONS: Cytoplasmic ß-catenin expression is an independent prognostic factor for conventional RCC, and may help to identify patients with a high risk of cancer-specific death and to direct optimized active surveillance or adjuvant therapy.


Assuntos
Biomarcadores Tumorais/análise , Carcinoma de Células Renais/patologia , Neoplasias Renais/patologia , beta Catenina/biossíntese , Adulto , Idoso , Carcinoma de Células Renais/mortalidade , Citoplasma/metabolismo , Progressão da Doença , Feminino , Humanos , Imuno-Histoquímica , Estimativa de Kaplan-Meier , Neoplasias Renais/mortalidade , Masculino , Pessoa de Meia-Idade , Prognóstico , Modelos de Riscos Proporcionais , Análise Serial de Tecidos , beta Catenina/análise
4.
Vaccine ; 30(48): 6824-32, 2012 Nov 06.
Artigo em Inglês | MEDLINE | ID: mdl-23000124

RESUMO

The alarming national data on the mortality and morbidity rates of cervical cancer as well as the results of a Hungarian survey demonstrating adolescents' low level of understanding of human papillomavirus (HPV) infection and HPV vaccination encouraged the authors to conduct an educational intervention. The aim of this survey was to explore the impact of a brief, HPV-focused program on adolescents' knowledge, beliefs and attitudes. A self-administered anonymous questionnaire was completed by 394 male and female adolescents in September, 2010, in Hungary. Half of the students (48.5%) then had a one-off educational intervention on aspects cervical cancer lasting 45 min lesson, while the rest of the participants, the control group, did not have the educational intervention. Three months following the education, both groups were retested using the same questionnaire. Data were analysed using Statistical Package for the Social Sciences (SPSS). Following the education, significant increase was detected in cervical cancer awareness: causal relationship between HPV and cervical cancer (7.9% → 22.1%, p<0.05), or perception of HPV vaccination (61.3% → 85.9%, p<0.05). Similarly, health-related beliefs have enhanced, such as 'HPV may cause cervical cancer' (64.9% → 81.0%, p<0.05) or 'cervical cancer may be prevented by vaccination' (66.5% → 85.3%, p<0.05). Our data also highlighted that Hungarian adolescents have been practising extremely risky sexual behaviour. Nearly half of the sexually active adolescents had engaged in 'one-night relationship' (41.1%) as well as having sexual intercourse without any contraceptive safety measures (44.3%). In addition to providing adolescents with clear and meaningful information about the implications of a HPV infection and addressing their fears of screening and vaccination, health education should focus on promoting safe sex behaviour by promoting the use of condoms and reducing the number of sexual partners to limit the spread of HPV, and also on encouraging the participation in regular cervical screenings, thus reducing the incidence of cervical cancer.


Assuntos
Educação Médica/métodos , Conhecimentos, Atitudes e Prática em Saúde , Neoplasias do Colo do Útero/prevenção & controle , Adolescente , Feminino , Humanos , Hungria , Masculino , Comportamento Sexual/estatística & dados numéricos , Inquéritos e Questionários , Adulto Jovem
5.
Vaccine ; 29(47): 8591-8, 2011 Nov 03.
Artigo em Inglês | MEDLINE | ID: mdl-21939711

RESUMO

Hungary takes the fourth place regarding the incidence and the fifth regarding the mortality of cervical cancer among the member countries of the European Union, with 500 deaths due to this preventable illness and nearly 1200 new cases diagnosed every year. Although the vaccines have been available for 3 years, the estimated rate of the female population vaccinated against HPV is approximately 10% in the 12-26-year-age cohort. The aim of this study was to determine factors and motivations affecting the uptake of HPV vaccination among Hungarian adolescents. Examining the effects of some possible sociodemographic predictors (age and gender) and the exposure to health information on HPV vaccine acceptability were also focused on, as well as assessing the most trusted sources of information about sexually transmitted diseases (STDs). A nationwide anonymous questionnaire survey with a sample of 1769 students attending public primary or secondary schools was organised by the authors in 16 Hungarian cities and towns. Data were analysed using the Statistical Package for the Social Sciences (SPSS). Adolescents' awareness of HPV was relatively low. Only 35% of the participants reported they had heard about HPV prior to the survey. Almost 70% of the potentially affected study population had not heard about the vaccine previously. Every fourth student did not believe that vaccination against HPV can prevent cervical cancer. If the vaccination was available free of charge, almost 80% of respondents would request it, but in case they had to pay for it, this number would significantly decrease. Significantly better knowledge and also more positive attitudes towards HPV vaccination was found in relation to the number of information sources. The majority of respondents (62-83%) were open for further information about STDs. The main trusted mediators were school-health services (61.3%), education on health at school (49.2%), health professionals (42.2%) and electronic media (24.6%). Since Hungarian adolescent students expect guidance about STDs principally from school health education, an urgent need for well-designed, HPV-focused educational programmes emerges. Launching such programmes would be especially important for the adolescent population to increase their awareness of the risks associated with HPV infection thus reducing the high incidence of cervical cancer in Hungary in the future.


Assuntos
Conhecimentos, Atitudes e Prática em Saúde , Infecções por Papillomavirus/prevenção & controle , Vacinas contra Papillomavirus/administração & dosagem , Vacinas contra Papillomavirus/imunologia , Aceitação pelo Paciente de Cuidados de Saúde/estatística & dados numéricos , Neoplasias do Colo do Útero/prevenção & controle , Adolescente , Criança , Estudos Transversais , Feminino , Humanos , Hungria/epidemiologia , Masculino , Infecções por Papillomavirus/complicações , Infecções por Papillomavirus/epidemiologia , Inquéritos e Questionários , Neoplasias do Colo do Útero/epidemiologia , Adulto Jovem
6.
Nitric Oxide ; 25(3): 309-15, 2011 Oct 30.
Artigo em Inglês | MEDLINE | ID: mdl-21645628

RESUMO

Importance of a nitric oxide donor that can act as a spin trap might bring some new therapeutic possibilities regarding the treatment of ischemic diseases by reducing the intensity of free radical produced reperfusion lesions. These substances might be also used as a new type of photo protectors since they can absorb UV radiation, capture free radicals formed by interaction of UV radiation with tissue constituents, and tanning of the skin will be permitted due to nitric oxide release. The purpose of this work was to measure the ability of nitrones to release nitric oxide and how different factors (temperature, nitrone concentration, and free radicals) influence the releasing ability. Mostly, indirect determination of nitric oxide was carried out, by measuring nitrite and nitrate amounts (as decomposition products of nitric oxide), all nitrones proved to release significant amounts of nitric oxide. Nitrite measurements were made based on an HPLC-VIS method that uses pre-column derivatization of nitrite by forming an azo dye (limit of quantification: 5ng/ml). No good correlation was found between the amount of nitric oxide and temperature for most studied nitrones but between the formation of nitric oxide and nitrone concentration an asymptotic correlation was found. Fenton reagent also yielded formation of nitric oxide from nitrones and formed amounts were not different from those recorded for UV irradiation. Most of the nitrones effectively released about 0.5% of the maximum amount of nitric oxide that is chemically possible and estimated concentrations of 0.1µM were present in the solutions during decomposition.


Assuntos
Radical Hidroxila/química , Óxido Nítrico/química , Óxidos de Nitrogênio/química , Óxidos de Nitrogênio/síntese química , Solventes/química , Temperatura Ambiente , Fatores de Tempo , Raios Ultravioleta , Água/química
7.
Vaccine ; 29(32): 5122-9, 2011 Jul 18.
Artigo em Inglês | MEDLINE | ID: mdl-21624417

RESUMO

Cervical cancer is one of the most prevalent gynaecological malignancies worldwide. The Hungarian incidence and mortality of this disease take the 4th-5th places within the European Union. A survey including 785 male and female adults was conducted to assess the knowledge and attitudes concerning HPV vaccination. We focused on the difficulties of the primary and secondary prevention of cervical cancer and examined some potential sociodemographic predictors of HPV vaccine acceptability. Our findings have identified some important issues like: incomplete knowledge, intense distrust and financial concerns. Almost half of the college students (45.6%) are unaware of HPV infections. We confirmed previous findings that older age and female gender correlates with better knowledge on STDs, including HPV. We found that greater exposure to health information comes with better knowledge and more positive attitudes towards vaccination. One quarter of survey respondents do not believe that cervical cancer may be prevented by vaccination. More than half of the adults do not trust national health care system and the preparedness of Hungarian doctors. General attitudes towards vaccination are broadly positive, 80% of survey participants had expressed desire towards HPV vaccination, however if there was a need to pay for the vaccination the willingness would decrease by half. Primary prevention through HPV-focused educational programs, clear communication and financial support would be important for public health to reduce the high incidence and mortality of cervical cancer in Hungary in the future.


Assuntos
Infecções por Papillomavirus/prevenção & controle , Vacinas contra Papillomavirus/imunologia , Aceitação pelo Paciente de Cuidados de Saúde , Neoplasias do Colo do Útero/prevenção & controle , Adolescente , Adulto , Informação de Saúde ao Consumidor , Coleta de Dados , Feminino , Humanos , Hungria , Masculino , Pessoa de Meia-Idade , Infecções por Papillomavirus/epidemiologia , Infecções por Papillomavirus/imunologia , Saúde Pública , Inquéritos e Questionários , Fatores de Tempo , Neoplasias do Colo do Útero/epidemiologia , Neoplasias do Colo do Útero/imunologia
8.
BMC Struct Biol ; 7: 41, 2007 Jun 24.
Artigo em Inglês | MEDLINE | ID: mdl-17588264

RESUMO

BACKGROUND: Thermal denaturation experiments were extended to study the thermal behaviour of the main motor proteins (actin and myosin) in their native environment in striated muscle fibres. The interaction of actin with myosin in the highly organized muscle structure is affected by internal forces; therefore their altered conformation and interaction may differ from those obtained in solution. The energetics of long functioning intermediate states of ATP hydrolysis cycle was studied in muscle fibres by differential scanning calorimetry (DSC). RESULTS: SETARAM Micro DSC-II was used to monitor the thermal denaturation of the fibre system in rigor and in the presence of nucleotide and nucleotide analogues. The AM.ADP.Pi state of the ATP hydrolysis cycle has a very short lifetime therefore, we mimicked the different intermediate states with AMP.PNP and/or inorganic phosphate analogues Vi and AlF4 or BeFx. Studying glycerol-extracted muscle fibres from the rabbit psoas muscle by DSC, three characteristic thermal transitions were detected in rigor. The thermal transitions can be assigned to myosin heads, myosin rods and actin with transition temperatures (Tm) of 52.9 +/- 0.7 degrees C, 57.9 +/- 0.7 degrees C, 63.7 +/- 1.0 degrees C. In different intermediate states of the ATP hydrolysis mimicked by nucleotide analogues a fourth thermal transition was also detected which is very likely connected with nucleotide binding domain of myosin and/or actin filaments. This transition temperature Tm4 depended on the mimicked intermediate states, and varied in the range of 66-77 degrees C. CONCLUSION: According to DSC measurements, strongly and weakly binding states of myosin to actin were significantly different. In the presence of ADP only a moderate change of the DSC pattern was detected in comparison with rigor, whereas in ADP.Pi state trapped by Vi, AlF4 or BeFx a remarkable stabilization was detected on the myosin head and actin filament which is reflected in a 3.0-10.0 degrees C shift in Tm to higher temperature. A similar effect was observed in the case of the nonhydrolyzable AMP.PNP analogue. Differential DSC measurements suggest that stabilization actin structure in the intermediate states of ATP hydrolysis may play an additional role in actin-myosin interaction.


Assuntos
Actinas/metabolismo , Trifosfato de Adenosina/metabolismo , Fibras Musculares Esqueléticas/metabolismo , Miosinas/metabolismo , Músculos Psoas/metabolismo , Actinas/fisiologia , Animais , Varredura Diferencial de Calorimetria , Glicerol , Hidrólise , Miosinas/fisiologia , Nucleotídeos/metabolismo , Desnaturação Proteica/fisiologia , Coelhos , Temperatura Ambiente
9.
FEMS Yeast Res ; 6(8): 1140-8, 2006 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-17156011

RESUMO

Lovastatin inhibited the growth of Candida albicans in a fungistatic way. Although it triggers apoptosis in a great variety of eukaryotic cells, including many tumour cell lines, lovastatin failed to provoke apoptotic events in this human pathogen. The fungistatic behaviour of this statin might arise from its negative influence on membrane fluidity. Because yeast-->pseudomycelium and hyphae morphogenetic transitions took place under exposure to lovastatin morphogenetic switch and apoptotic cell death must be regulated independently in C. albicans.


Assuntos
Antifúngicos/farmacologia , Apoptose/efeitos dos fármacos , Candida albicans/efeitos dos fármacos , Lovastatina/farmacologia , Candida albicans/crescimento & desenvolvimento , Membrana Celular/efeitos dos fármacos , Membrana Celular/metabolismo , Fragmentação do DNA/efeitos dos fármacos , DNA Fúngico/efeitos dos fármacos , Humanos
10.
Environ Toxicol Pharmacol ; 16(3): 163-8, 2004 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-21782703

RESUMO

Differential scanning calorimetry (DSC) and electron paramagnetic resonance spectroscopy (EPR) experiments were performed on human erythrocyte membranes and 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) model systems in order to study the effect the polycyclic aromatic hydrocarbons on lipid structure and dynamics. Eight different compounds among others naphthalene and pyrene were compared, which occur in significant concentrations in dust collected from the air in large cities. Experiments using spin label technique showed that the compounds induced mobility changes in the lipid region in the environment of the fatty acid probe molecules incorporated into the membranes. The effects depended on the structure and concentration of the different compounds. Similarly to EPR observations, DSC measurements reported decrease of transition temperature in comparison to control DPPC vesicles. These results suggest that polycyclic aromatic hydrocarbons were able to modify the internal dynamics of erythrocyte membranes which might lead to damage of the biological functions.

SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA