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1.
J Craniofac Surg ; 34(3): 1082-1084, 2023 May 01.
Artigo em Inglês | MEDLINE | ID: mdl-36036489

RESUMO

Measurements from a certain population may show a similar pattern that allows an alteration to be easily recognized and enable a better surgical approach. In our population, the changes in the anthropometric measurements of the lips are unknown, so our objective is to determine the variations in these measurements by decades of age to achieve a better aesthetic and reconstructive surgical approach. Anthropometric measurements of the lips were taken with a vernier in relation to the previously marked anatomical points. The sample consists of 174 patients who came for care not related to labial pathologies with ages between 20 and 80 years with Mexican nationality. We use the sample calculation formula to estimate an average, with an alpha error of 0.5 and a tolerance of 2 mm of the data for the measurements of the height of the lower face with an average measurement of 56.2 mm and a SD of 8.87 mm of the Marzena's article. Wyganowska-Swiatkowska and colleagues Average measurements were obtained, where a progressive longitudinal increase in measures: al-ch, sbl-cph, sn-Is, li-sto, cph-Is, li-sl, ch-li, li-pg according to aging is confirmed. In contrast, the ch-cph and ch-sbl measures, remain the same despite the aging, showing greater changes in the sagittal plane than in the parasagittal. The study only shows measures of length, so caring out a magnetic resonance imaging study to also measure the volume and perform it with a larger sample to have the optimal standard is further needed.


Assuntos
Face , Lábio , Humanos , Adulto Jovem , Adulto , Pessoa de Meia-Idade , Idoso , Idoso de 80 Anos ou mais , Face/anatomia & histologia , Estética Dentária , Processamento de Imagem Assistida por Computador , Antropometria
2.
Odontology ; 105(4): 467-476, 2017 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-27888369

RESUMO

The aim of this study was to determine the relationship between the prevalence of Porphyromonas gingivalis, its fimA genotypes, Aggregatibacter actinomycetemcomitans, Tannerella forsythia, and Treponema denticola and the evolution of periodontal health. In a longitudinal prospective study, samples of subgingival plaque were taken from 114 patients (37 with chronic periodontitis, 17 with gingivitis, and 60 periodontally healthy) in the course of a full periodontal examination. PCR was employed to determine the presence of the periodontopathogenic bacteria. Four years later, a second examination and sample collection were performed in 90 of these patients (20 with chronic periodontitis, 12 with gingivitis, and 58 periodontally healthy). T. forsythia, P. gingivalis, and T. denticola are the most prevalent bacteria in patients with chronic periodontitis (78.4%, 62.2 y 56.8%, respectively). The P. gingivalis bacterium and its fimA genotypes I, II, and IV showed the highest correlation between the baseline and follow-up assessments. P. gingivalis fimA genotype II and T. forsythia were associated to a significant degree with unfavourable periodontal evolution. Of the variables studied, P. gingivalis fimA genotype II and T. forsythia increase the risk of an unfavourable evolution of periodontal status.


Assuntos
Aggregatibacter actinomycetemcomitans/isolamento & purificação , Periodontite Crônica/microbiologia , Placa Dentária/microbiologia , Gengivite/microbiologia , Porphyromonas gingivalis/isolamento & purificação , Tannerella forsythia/isolamento & purificação , Treponema denticola/isolamento & purificação , Adulto , Feminino , Humanos , Estudos Longitudinais , Masculino , Pessoa de Meia-Idade , Reação em Cadeia da Polimerase , Prevalência , Estudos Prospectivos
3.
Pharm Res ; 33(7): 1615-27, 2016 07.
Artigo em Inglês | MEDLINE | ID: mdl-26956459

RESUMO

PURPOSE: Melatonin (MLT) could be candidate drug for treatment of several diseases because of its high antioxidant and anticarcinogenic activity and its important biological roles. The aim of this study was to assess the influence of different vehicles on the permeation of MLT through buccal and skin tissues. METHODS: Formulations were characterized in terms of rheology, drug release and permeation through human skin as well as porcine buccal mucosa. Irradiation experiments were also performed. RESULTS: The lowest amount of MLT released was from oral adhesive paste Orabase® (OB) and the highest from the emulsion system Montanov® 68 (M68). Skin permeation revealed high pattern for Carbopol® 940 (C940) and M68, and poor for poloxamer 407 (P407) and Pluronic® lecithin organogel (PLO). Statistical differences of MLT remaining in skin between M68 vs C940 (p < 0.05) and M68 vs PLO (p < 0.05) were observed. Transmucosal results showed that sodium carboxymethylcellulose (NaCMC) was the best and OB the worst vehicle. P407 and PLO followed similar behaviour. Photostability studies revealed high percentage of degradation of MLT in solution which was also similar when was loaded in OB. The rest of formulations showed low rates of degradation. CONCLUSIONS: C940 or M68 and NaCMC can be proposed as formulations for a potential systemic effect of MLT by skin and buccal mucosa routes, respectively. However, if the intended objective is to obtain local action in the skin and buccal mucosa, the proposed formulations are M68 or P407 and PLO.


Assuntos
Excipientes/química , Melatonina/administração & dosagem , Melatonina/química , Mucosa Bucal/metabolismo , Veículos Farmacêuticos/química , Pele/metabolismo , Adesivos/administração & dosagem , Adesivos/química , Administração Cutânea , Animais , Química Farmacêutica/métodos , Sistemas de Liberação de Medicamentos/métodos , Liberação Controlada de Fármacos/fisiologia , Emulsões/administração & dosagem , Emulsões/química , Humanos , Lecitinas/química , Permeabilidade , Poloxâmero/química , Reologia , Suínos
4.
Rev Esp Enferm Dig ; 108(12): 811-812, 2016 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-27931108

RESUMO

The ingestion of cell batteries can cause serious complications (fistula, perforation or stenosis) at the esophageal level. The damage starts soon after ingestion (approximately 2 hours) and is directly related to the amount of time the battery is lodged in said location, the amount of electrical charge remaining in the battery, and the size of the battery itself. Injury is produced by the combination of electrochemical and chemical mechanisms and pressure necrosis. The ingestion of multiple cells and a size > = 20 mm are related with more severe and clinically significant outcomes. A female patient, 39 years old, with a history of previous suicide attempts, was admitted to the Emergency Room with chest pain and dysphagia after voluntary ingestion of 2 cell batteries. Two cell batteries are easily detected in a routine chest X-ray, presenting a characteristic double-ring shadow, or peripheral halo. Urgent oral endoscopy was performed 10 hours after ingestion, showing a greenish-gray lumpy magma-like consistency due to leakage of battery contents. The 2 batteries were sequentially removed with alligator-jaw forceps. After flushing and aspiration of the chemical material, a broad and circumferential injury with denudation of the mucosa and two deep ulcerations with necrosis were observed where the batteries had been. The batteries' seals were eroded, releasing chemical contents. Despite the severity of the injuries, the patient progressed favorably and there was no esophageal perforation. Esophageal impaction of cell batteries should always be considered an endoscopic urgency.


Assuntos
Queimaduras Químicas/patologia , Esôfago/lesões , Tentativa de Suicídio , Adulto , Queimaduras Químicas/diagnóstico por imagem , Fontes de Energia Elétrica , Endoscopia Gastrointestinal , Esôfago/diagnóstico por imagem , Esôfago/patologia , Feminino , Corpos Estranhos , Humanos , Mucosa/patologia , Úlcera/patologia
5.
Med Oral Patol Oral Cir Bucal ; 18(6): e839-45, 2013 Nov 01.
Artigo em Inglês | MEDLINE | ID: mdl-23722138

RESUMO

A cross-sectional study was carried out to determine the prevalence of Streptococcus mutans and Streptococcus sobrinus and the association of the two in a random sample (n=614) of the child population of the region of Valencia (Spain). Saliva samples were analyzed by the quantitative polymerase chain reaction (PCR) method to study the relation of these bacteria to caries prevalence and the DMFT index. The prevalence of S. mutans was 35.4% at age 12 and 22.9% at age 15, that of S. sobrinus 18.9% and 8.4% and that of the S. mutans-S. sobrinus association 18.2% and 6.8% respectively. At both 12 and 15 years of age, the caries prevalence rates were lower in the Streptococcus-free group of children (37.6% and 48.5% respectively) and higher in the S.mutans-only group (67.3% and 74.0%). At the age of 12, the DMFT index was significantly higher in the mutans-only carriers (2.1) than in the Streptococcus-free and S. mutans-S. sobrinus association groups (both 0.9). At the age of 15, the DMFT index was significantly higher in the S. mutans-S. sobrinus association (3.71) and mutans-only (3.1) carrier groups than in the Streptococcus-free group (1.4). Determination of S. mutans and S. sobrinus by real-time quantitative PCR can provide valuable information for caries risk assessment in epidemiological studies.


Assuntos
Cárie Dentária/microbiologia , Reação em Cadeia da Polimerase , Streptococcus mutans/isolamento & purificação , Streptococcus sobrinus/isolamento & purificação , Adolescente , Criança , Estudos Transversais , Índice CPO , Cárie Dentária/epidemiologia , Humanos , Prevalência , Espanha
6.
Med Oral Patol Oral Cir Bucal ; 17(6): e1047-53, 2012 Nov 01.
Artigo em Inglês | MEDLINE | ID: mdl-22549664

RESUMO

OBJECTIVES: The aim of this study was to determine the prevalence of the different fimA genotypes of Porphyromonas gingivalis in adult Spanish patients with chronic periodontitis, patients with gingivitis and periodontally healthy subjects, and the relationship between these genotypes and other periodontopathogenic bacteria. STUDY DESIGN: Samples of subgingival plaque were taken from 86 patients (33 with chronic periodontitis, 16 with gingivitis, and 37 periodontally healthy) in the course of a full periodontal examination. PCR was employed to determine the presence of the 6 fimA genotypes of Porphyromonas gingivalis (I-V and Ib) and of Aggregatibacter actinomycetemcomitans, Tannerella forsythia and Treponema denticola. RESULTS: Porphyromonas gingivalis fimA genotypes II and Ib were present in significantly higher percentages in periodontal patients (39.4% and 12.1% respectively) than in healthy or gingivitis subjects. The prevalence of Tannerella forsythia, Treponema denticola, and Porphyromonas gingivalis fimA genotype IV was significantly higher in the group that presented bleeding greater than 30%. A positive correlation was found between Porphyromonas gingivalis fimA genotype IV and Treponema denticola. CONCLUSIONS: A strong association between Porphyromonas gingivalis fimA genotypes II and Ib and chronic periodontitis exists in the Spanish population. The most prevalent genotype in periodontal patients is II.


Assuntos
Periodontite Crônica/microbiologia , Proteínas de Fímbrias/genética , Genótipo , Porphyromonas gingivalis/genética , Adulto , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Porphyromonas gingivalis/isolamento & purificação , Espanha
7.
Rev Enferm ; 35(11): 27-32, 2012 Nov.
Artigo em Espanhol | MEDLINE | ID: mdl-23330329

RESUMO

Chronic wounds represent a drain on the Spanish health system, nowdays is necessary an optimization of the resources used and that is for this that is necessary justify the use of the products over others through cost-effective studies for to show the economic benefit to professionals and the life quality of patient. This article compares the use of a new technology for format polyurethane foam, TLC-NOSF, with the most commonly used products for treating wounds. This comparison is made using a cost-effectiveness model (Markov Model). The results demonstrate that treatment with polyurethane foam dressing with TLC-NOSF are cost-effective versus treatments with polyurethane foams most commonly used in Spain.


Assuntos
Bandagens/economia , Úlcera da Perna/terapia , Poliuretanos/economia , Análise Custo-Benefício , Humanos
8.
Methods Mol Biol ; 2296: 185-194, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-33977448

RESUMO

Electroporation is a method for the introduction of molecules (usually nucleic acids) into a cell, consisting of submitting the cells to high-voltage and short electric pulses in the presence of the exogenous DNA/molecule. It is a versatile method, adaptable to different types of cells, from bacteria to cultured cells to higher eukaryotes, and thus has applications in many diverse fields, such as environmental biology, biotechnology, genetic engineering, and medicine. Electroporation has some advantages over other genetic transformation strategies, including the simplicity of the method, a wide range of adjustable parameters (possibility of optimization), high reproducibility and avoidance of the use of chemicals toxic to cells. Here we describe an optimized electroporation procedure for the industrially important fungus Acremonium chrysogenum, using germinated conidia and fragmented young mycelium. In both cases, the transformation efficiency was higher compared to the conventional polyethylene glycol (PEG)-mediated transformation of protoplasts.


Assuntos
Eletroporação/métodos , Fungos/genética , Acremonium/genética , Biotecnologia/métodos , Engenharia Genética/métodos , Micélio/genética , Polietilenoglicóis/química , Protoplastos , Reprodutibilidade dos Testes , Transformação Genética/genética
9.
Environ Sci Pollut Res Int ; 27(1): 33-42, 2020 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-31522401

RESUMO

Recycled steel is a key material for sustainable development. However, not all steel demand can be met by recycling, and therefore, new metallic iron must be introduced in the global cycle. The transformation of iron oxides into steel requires carbon which is oxidized into CO2. This paper focuses on the basic oxygen furnace (BOF) where molten iron is converted into liquid steel. In order to assess the effect of molten iron temperature on CO2 emissions, the process has been modelled using mass and energy balances. Model results show that, for a typical converter charge, a slight increase of 10 °C can lead to a direct reduction of 0.006 t of CO2 per ton of liquid steel. A total variation of 0.17 t of CO2 per ton of liquid steel is found depending on plant strategy and process constraints. Finally, different actuation levers for carbon mitigation are assessed. It can be concluded that operation and modelling improvements should be jointly addressed to exploit their full potential for carbon footprint reduction.


Assuntos
Poluentes Atmosféricos/análise , Dióxido de Carbono/análise , Temperatura Alta , Metais , Carbono , Pegada de Carbono , Ferro , Oxigênio , Reciclagem , Aço , Temperatura
10.
Appl Biochem Biotechnol ; 190(1): 1-17, 2020 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-31297755

RESUMO

A novel concept of membrane bioreactor based on polymeric ionic liquids laccase membrane has been implemented in batch process for decolorization of the anthraquinonic dye Remazol Brillant Blue R (RBBR). New laccase immobilization strategy has been optimized by casting the enzyme into a polymeric inclusion membrane (PIM) using ionic liquids (ILs) and polyvinyl chloride (PVC) leading to laccase polymeric IL membrane (PILM). Four different ILs (1-octyl-3-metylimidazolium bis(trifluoromethylsulfonyl)imide, [OMIM][NTF2]; cholinium bis(trifluoromethylsulfonyl)imide, [Ch ol][NTF2]; cholinium dihydrogenphosphate, [Chol][H2PO4] and hydroxyethylammonium formate, [HEA][Fo]) have been screened and mixed to constitute the active phase of the support of PIM. This strategy has been fully succeeded since high laccase immobilization rates were recorded (about 98%) when using the optimal mixture containing three ILs (45% [OMIM][NTf2]/5% [Chol][NTf2]/2.5% [HEA][Fo]) and supplemented by 0.5% glutaraldehyde. It was found that such mixture contributes to increase the stability and reusability of laccase-PILM during eight successive assays in a batch discontinued stirred reactor. Decolorization rate of 75% has been reached in the batch decolorization process of RBBR with high reusability yield. Graphical Abstract Decolorization of RBBR by PILM_laccase.


Assuntos
Reatores Biológicos , Reagentes de Ligações Cruzadas/química , Enzimas Imobilizadas/metabolismo , Líquidos Iônicos/química , Lacase/metabolismo , Membranas Artificiais , Cor
11.
Span J Psychol ; 11(1): 3-15, 2008 May.
Artigo em Inglês | MEDLINE | ID: mdl-18630643

RESUMO

The aim of the present study was to assess the effects of daily stress perception on cognitive performance and morning basal salivary cortisol and alpha-amylase levels in healthy children aged 9-12. Participants were classified by whether they had low daily perceived stress (LPS, n = 27) or a high daily perceived stress (HPS, n = 26) using the Children Daily Stress Inventory (CDSI). Salivary cortisol and alpha-amylase were measured at awakening and 30 minutes later. Cognitive performance was assessed using the Cognitive Drug Research assessment system. The HPS group exhibited significantly poorer scores on speed of memory (p < .05) and continuity of attention (p < .05) relative to the LPS group. The HPS group also showed significantly lower morning cortisol levels at awakening and at +30 minutes measures in comparison with the LPS group (p < .05), and mean morning cortisol levels were negatively correlated with speed of memory (p < .05) in the 53 participants. No significant differences were observed between both groups in alpha-amylase levels. These findings suggest that daily perceived stress in children may impoverish cognitive performance via its modulating effects on the HPA axis activity.


Assuntos
Nível de Alerta/fisiologia , Atenção/fisiologia , Ritmo Circadiano/fisiologia , Hidrocortisona/sangue , Memória/fisiologia , Estresse Psicológico/sangue , alfa-Amilases/sangue , Logro , Criança , Feminino , Humanos , Masculino , Inventário de Personalidade , Valores de Referência , Saliva/química
12.
J Mol Microbiol Biotechnol ; 28(1): 1-13, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-29486469

RESUMO

Ligninolytic enzyme production and lignin degradation are typically the rate-limiting steps in the biofuel industry. To improve the efficiency of simultaneous bio-delignification and enzyme production, Phanerochaete chrysosporium was transformed by shock wave-induced acoustic cavitation to co-overexpress 3 peroxidases and 1 laccase and test it on the degradation of sugarcane bagasse and wheat bran. Lignin depolymerization was enhanced by up to 25% in the presence of recombinant fungi in comparison with the wild-type strain. Sugar release on lignocellulose was 2- to 6-fold higher by recombinant fungi as compared with the control. Wheat bran ostensibly stimulated the production of ligninolytic enzymes. The highest peroxidase activity from the recombinant strains was 2.6-fold higher, whereas the increase in laccase activity was 4-fold higher in comparison to the control. The improvement of lignin degradation was directly proportional to the highest peroxidase and laccase activity. Because various phenolic compounds released during lignocellulose degradation have proven to be toxic to cells and to inhibit enzyme activity, a significant reduction (over 40%) of the total phenolic content in the samples treated with recombinant strains was observed. To our knowledge, this is the first report that engineering P. chrysosporium enhances biodegradation of lignocellulosic biomass.


Assuntos
Biomassa , Lacase/biossíntese , Lacase/genética , Peroxidases/biossíntese , Peroxidases/genética , Phanerochaete/genética , Phanerochaete/metabolismo , Biodegradação Ambiental , Biocombustíveis , Celulose/metabolismo , Clonagem Molecular , Fibras na Dieta , Ergosterol , Proteínas Fúngicas/genética , Proteínas Fúngicas/metabolismo , Regulação Fúngica da Expressão Gênica , Lignina/metabolismo , Engenharia Metabólica , Phanerochaete/enzimologia , Phanerochaete/crescimento & desenvolvimento , Proteínas Recombinantes/genética , Proteínas Recombinantes/metabolismo , Saccharum , Transformação Genética
13.
Int J Antimicrob Agents ; 30(4): 325-9, 2007 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-17631982

RESUMO

The in vitro antileishmanial activities of various new amphotericin B (AMB) formulations were investigated, including microspheres of hydrophilic albumin with three AMB aggregation forms (monomeric, dimeric and multiaggregate) and the polymers of polylactic-co-glycolic acid, Resomer RG502 and RG503 with the multiaggregate AMB form. This in vitro study was performed on the extracellular promastigote form and the intracellular amastigote form of a canine strain of Leishmania infantum (UCM 20) using the infected J774 murine macrophage-like cell line. Albumin-encapsulated forms did not show any toxicity for murine cells and had lower median effective concentration (EC50) values (ca. 0.003 microg/mL) for L. infantum amastigotes than free formulations (0.03 microg/mL). In addition, the aggregation state of AMB had a notable effect on the antileishmanial activity of the drug. Results obtained in vitro point towards interest in monomeric AMB encapsulated in microspheres in the chemotherapeutic control of leishmaniasis.


Assuntos
Anfotericina B/farmacologia , Antiprotozoários/farmacologia , Química Farmacêutica , Sistemas de Liberação de Medicamentos , Leishmania infantum/efeitos dos fármacos , Testes de Sensibilidade Parasitária , Albuminas/farmacologia , Anfotericina B/química , Anfotericina B/toxicidade , Animais , Antiprotozoários/química , Antiprotozoários/toxicidade , Linhagem Celular , Glicolatos/farmacologia , Ácido Láctico , Leishmania infantum/crescimento & desenvolvimento , Estágios do Ciclo de Vida/efeitos dos fármacos , Macrófagos/parasitologia , Camundongos , Microesferas , Ácido Poliglicólico , Copolímero de Ácido Poliláctico e Ácido Poliglicólico
14.
Alcohol ; 41(7): 511-5, 2007 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-17913441

RESUMO

Ethanol consumption may impair bone growth. Transverse radiopaque lines (Harris lines) have been interpreted as manifestations of bone growth arrest due to nutritional stress. It is possible that ethanol consumption during growth leads to Harris lines formation and to a shorter stature. Plain X-ray film of the right tibia was performed to 175 individuals, who were inquired about ethanol consumption, periods of perceived hunger, and protracted illness during growth period (from birth to 18 years of age). Stature was also recorded. Men who drank during growth showed a shorter stature than those who did not (t=3.65, P<.001). Differences were not statistically significant among women (t=0.95). Neither periods of perceived hunger nor illness were associated to differences in stature. Ethanol consumption during growth showed a significant association with the presence of Harris lines (chi(2)=15, P<.001, Odds Ratio [OR]=3.39, confidence interval [CI]=1.81-6.33), an association which was more marked between having two or more Harris lines and drinking during growth (chi(2)=23.19, P<.001, OR=6.04, CI=2.79-13.11) or having three or more lines and drinking during growth (chi(2)=15.93, P<.001, OR=7.41, CI=2.47-22.21). Periods of perceived hunger during growth were also related to the presence of two or more Harris lines (chi(2)=4.66, P=.031, OR=2.055, CI=1.065-3.965), but no association was observed between illness and Harris lines, two or more Harris lines, and three or more Harris lines. Multivariate analysis showed that only ethanol consumption during growth period was associated with Harris lines.


Assuntos
Consumo de Bebidas Alcoólicas/efeitos adversos , Osso e Ossos/diagnóstico por imagem , Transtornos do Crescimento/induzido quimicamente , Crescimento/efeitos dos fármacos , Crescimento/fisiologia , Idoso , Idoso de 80 Anos ou mais , Consumo de Bebidas Alcoólicas/epidemiologia , Consumo de Bebidas Alcoólicas/psicologia , Ilhas Atlânticas/epidemiologia , Estatura/efeitos dos fármacos , Estatura/fisiologia , Doenças do Desenvolvimento Ósseo/induzido quimicamente , Doenças do Desenvolvimento Ósseo/diagnóstico por imagem , Osso e Ossos/efeitos dos fármacos , Período Crítico Psicológico , Etanol/efeitos adversos , Etanol/farmacologia , Feminino , Transtornos do Crescimento/epidemiologia , Humanos , Masculino , Má Oclusão/epidemiologia , Pessoa de Meia-Idade , Osteogênese/efeitos dos fármacos , Radiografia , Fatores de Risco , Fatores Sexuais , Espanha
15.
Arch Dermatol Res ; 306(8): 711-7, 2014 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-24997631

RESUMO

Cetirizine dihydrochloride (CTZ) is a second-generation histamine H1 antagonist, effective for the treatment of a wide range of allergic diseases. It has been utilized for managing the symptoms of chronic urticaria and atopic skin conditions. Thus, two novel semisolid formulations, nanoemulsion (NE) and hydrogel (HG) were developed to study their potential utility as vehicles including cetirizine (CTZ) and evaluate the potential use as topical H1-antihistamines agents. The physicochemical and stability properties of both vehicles were tested. Drug release kinetics and human skin permeation studies were performed using Franz cells. The antihistaminic activity was assayed in New Zealand rabbits and compared with two commercial first generation antihistamines. Both formulations were stable and provided a sustained drug release. Amounts of CTZ remaining in the skin were higher for HG, showing the maximum biological effect at 30 min, similar to topical first generation H1-antihistamines commercially available. These results suggest that CTZ-HG could be a promising system for the treatment of topical allergy bringing rapid antihistaminic relief.


Assuntos
Cetirizina/administração & dosagem , Antagonistas não Sedativos dos Receptores H1 da Histamina/administração & dosagem , Hidrogel de Polietilenoglicol-Dimetacrilato/administração & dosagem , Nanoestruturas/administração & dosagem , Absorção Cutânea/efeitos dos fármacos , Administração Tópica , Animais , Células Cultivadas , Cetirizina/efeitos adversos , Emulsões , Antagonistas não Sedativos dos Receptores H1 da Histamina/efeitos adversos , Humanos , Masculino , Coelhos
16.
Ultrasound Med Biol ; 40(7): 1599-608, 2014 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-24642223

RESUMO

Cationic lipid/DNA complexes (lipoplexes) represent a powerful tool for cell transfection; however, their use is still limited by important concerns, including toxicity and poor internalization into deep tissues. In this work, we investigated the use of shock wave-induced acoustic cavitation in vitro for the transfection of lipoplexes in human embryo kidney 293 cells. We selected shock waves with the ability to internalize 10-kDa fluorescein isothiocyanate-dextran into cells while maintaining survival rates above 50%. Cell transfection was tested using the green fluorescent protein-encoding plasmid pCX::GFPGPI2. Confocal microscopy and fluorescence-assisted cell sorting analyses revealed successful transfection after treatments ranging from 1 to 3 min using 60 to 180 shock waves at peak amplitudes of 12.3 ± 1.5 MPa. Interestingly, the combination of shock waves and lipoplexes induced a 3.1- and 3.8-fold increase in the expression of the reporter gene compared with the use of lipoplexes or shock waves alone, respectively. These results indicate that cationic DNA assembly and shock waves act in a synergistic manner to promote transfection of human cells, revealing a potential approach for non-invasive site-specific gene therapy.


Assuntos
Permeabilidade da Membrana Celular/efeitos da radiação , DNA/genética , Eletroporação/métodos , Proteínas de Fluorescência Verde/genética , Lipossomos/química , Lipossomos/efeitos da radiação , Transfecção/métodos , Cátions , DNA/administração & dosagem , Proteínas de Fluorescência Verde/administração & dosagem , Células HEK293 , Ondas de Choque de Alta Energia , Humanos , Sonicação/métodos
17.
Drug Des Devel Ther ; 8: 1467-79, 2014.
Artigo em Inglês | MEDLINE | ID: mdl-25258515

RESUMO

BACKGROUND: Mebendazole (MBZ) is an extremely insoluble and therefore poorly absorbed drug and the variable clinical results may correlate with blood concentrations. The necessity of a prolonged high dose treatment of this drug increases the risk of adverse effects. METHODS: In the present study we prepared redispersible microparticles (RDM) containing MBZ, an oral, poorly water-soluble drug, in different proportions of low-substituted hydroxypropylcellulose (L-HPC). We investigated the microparticulate structures that emerge spontaneously upon dispersion of an RDM in aqueous medium and elucidated their influence on dissolution, and also on their oral bioavailability and therapeutic efficiency using a murine model of infection with the nematode parasite Trichinella spiralis. RESULTS: Elevated percentages of dissolved drug were obtained with RDM at 1:2.5 and 1:5 ratios of MBZ: L-HPC. Thermal analysis showed an amorphization of MBZ in the RDM by the absence of a clear MBZ melting peak in formulations. The rapid dissolution behavior could be due to the decreased drug crystallinity, the fast dissolution time of carriers as L-HPC, together with its superior dispersibility and excellent wetting properties. RDM-1:2.5 and RDM-1:5 resulted in increased maximum plasma concentration and area(s) under the curve (AUC)0-∞ values. Likewise, after oral administration of the RDM-1:2.5 and RDM-1:5 the AUC0-∞ were 2.67- and 2.97-fold higher, respectively, compared to those of pure MBZ. Therapeutic activity, assessed on the Trichinella spiralis life cycle, showed that RDM-1:5 was the most effective in reducing the number of parasites (4.56-fold) as compared to pure MBZ, on the encysted stage. CONCLUSION: THE MBZ: L-HPC RDM might be an effective way of improving oral bioavailability and therapeutic activity using low doses of MBZ (5 mg/kg), which implies a low degree of toxicity for humans.


Assuntos
Anti-Helmínticos/administração & dosagem , Anti-Helmínticos/farmacologia , Celulose/análogos & derivados , Mebendazol/administração & dosagem , Mebendazol/farmacologia , Trichinella spiralis/efeitos dos fármacos , Triquinelose/tratamento farmacológico , Administração Oral , Animais , Anti-Helmínticos/farmacocinética , Anti-Helmínticos/uso terapêutico , Disponibilidade Biológica , Celulose/administração & dosagem , Celulose/química , Celulose/farmacocinética , Modelos Animais de Doenças , Estágios do Ciclo de Vida/efeitos dos fármacos , Mebendazol/farmacocinética , Mebendazol/uso terapêutico , Camundongos , Camundongos Endogâmicos , Tamanho da Partícula , Solubilidade , Propriedades de Superfície
18.
J Biomater Sci Polym Ed ; 22(13): 1799-810, 2011.
Artigo em Inglês | MEDLINE | ID: mdl-20843435

RESUMO

In medicine, micro-electro-mechanical systems (MEMS) perform several specific functions. The design of bio-packages for MEMS to be implanted into the human body has been an increasing challenge in the last years. Mechanical, chemical and thermal resistance, as well as excellent bonding to silicon surfaces, are needed. Furthermore, ideal bio-packages should minimize post-operative complications and be well accepted by the host. To reach this goal, two different morphology-controlled hydroxyapatite-based porous biomaterials were synthesized, implanted in rats and evaluated mechanically and histologically. The novel biomaterials were prepared at room temperature using synthetic hydroxyapatite micro-particles, silica nanoparticles and water-based resin and compared with a standard hydroxyapatite biomaterial. The morphology (porosity) was controlled to obtain interconnected pores with appropriated pore size and pore volume fraction. All biomaterials were implanted in rats at the dorsal area near the third thoracic vertebra. The rats were killed 2, 7 and 21 days after surgery. Histological analysis revealed that the implants were well accepted by the host and minimal local inflammation was observed. The acute inflammatory response disappeared 21 days after surgery for both novel biomaterials. Additionally, organic matter (collagen) was produced in the interior of the porous biomaterial, indicating that an incipient vascularization process was in progress after 21 days of implantation. Both new biomaterials showed high abrasion resistance, high Young modulus, the appropriate porosity to allow possible vascularization, and good bonding to silicon surfaces.


Assuntos
Materiais Biocompatíveis/química , Durapatita/química , Próteses e Implantes , Animais , Colágeno/química , Colágeno/metabolismo , Sistemas Microeletromecânicos , Porosidade , Ratos
19.
Int J Pharm ; 403(1-2): 23-8, 2011 Jan 17.
Artigo em Inglês | MEDLINE | ID: mdl-20934497

RESUMO

To improve the efficacy of mebendazole (MBZ), a poorly water-soluble drug, MBZ solid dispersions containing different proportions of low-substituted hydroxypropylcellulose (L-HPC) were prepared by lyophilization process. The physical characteristics of recrystallized MBZ, and solid dispersions (SD) at different MBZ:L-HPC proportions were investigated in terms of morphology (scanning electron microscopy, SEM), powder X-ray diffraction (XRD), differential scanning calorimetry (DSC) and dissolution rate. The in vivo performance was assessed by anthelmintic activity studies against enteral (pre-adult) stage of Trichinella spiralis in mice. The XRD, DSC and SEM revealed a characteristic decrease in crystallinity when increasing the L-HPC proportions in the solid dispersions. The dissolution studies demonstrated a marked increase in the dissolution rate in comparison with recrystallized drug. The considerable improvement in the dissolution rate of MBZ from solid dispersions was attributed to decreased drug crystallinity and altered surface morphology (major) and to the wetting effect of L-HPC (minor). The in vivo studies revealed that the anthelmintic effects of solid dispersions in mice were significantly increased in comparison with recrystallized MBZ (1.74-fold for SD-1:1, 3.20-fold for SD-1:2.5 and 3.80-fold for SD-1:5). These results have shown the suitability of MBZ:L-HPC solid dispersions for the treatment of enteral helmintic diseases at low doses.


Assuntos
Antinematódeos/química , Antinematódeos/farmacologia , Mebendazol/química , Mebendazol/farmacologia , Trichinella spiralis/efeitos dos fármacos , Animais , Antinematódeos/administração & dosagem , Antinematódeos/uso terapêutico , Varredura Diferencial de Calorimetria , Celulose/análogos & derivados , Celulose/química , Química Farmacêutica , Cristalização , Portadores de Fármacos/química , Mebendazol/administração & dosagem , Mebendazol/uso terapêutico , Camundongos , Microscopia Eletrônica de Varredura , Solubilidade , Propriedades de Superfície , Triquinelose/tratamento farmacológico , Triquinelose/parasitologia , Difração de Raios X
20.
Vaccine ; 24(15): 2772-80, 2006 Apr 05.
Artigo em Inglês | MEDLINE | ID: mdl-16446017

RESUMO

BALB/c and NIH mice have been successfully vaccinated against the intestinal nematode Trichinella spiralis by oral administration of crude larval extracts (CLE) and excretory-secretory (ES) products derived from first stage T. spiralis larvae (L1) encapsulated in microcapsules made of copolymers of the metacrylic acid (Eudragit L100). Oral vaccination stimulated the secretion of IFN-gamma and inhibited the secretion of IL-4 in spleen and mesenteric lymph nodes (MLN) of BALB/c mice. In vaccinated mice the proportion of CD4+ cells increased (p<0.05) in Peyer's patches (PP) and decreased (p<0.05) in spleen whereas the proportion of CD19+ cells decreased (p<0.05) in both PP and spleen, with regard to unvaccinated controls. No variation was evident for the proportion of CD8+ cells. Oral vaccination elevated the antigen-specific serum IgG1 and IgA (p<0.05) as well as the antigen-specific IgA response in MLN (p<0.05). It is concluded that this way of vaccination induced a concurrent Th1/ Th2 local and systemic responses that are protective and at the same time they may help balancing the strong Th2 response triggered by helminth infections.


Assuntos
Antígenos de Helmintos/imunologia , Ácidos Polimetacrílicos/farmacologia , Trichinella spiralis , Triquinelose/prevenção & controle , Vacinas/imunologia , Adjuvantes Imunológicos/farmacologia , Administração Oral , Animais , Anticorpos Anti-Helmínticos/sangue , Antígenos de Helmintos/administração & dosagem , Cápsulas , Modelos Animais de Doenças , Feminino , Imunoglobulina A/sangue , Imunoglobulina G/sangue , Interferon gama/biossíntese , Linfonodos/imunologia , Subpopulações de Linfócitos/imunologia , Camundongos , Camundongos Endogâmicos BALB C , Nódulos Linfáticos Agregados/imunologia , Ácidos Polimetacrílicos/administração & dosagem , Baço/imunologia , Trichinella spiralis/imunologia , Triquinelose/imunologia , Vacinas/administração & dosagem
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