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1.
Medicina (B.Aires) ; 71(4): 343-349, July-Aug. 2011. ilus, tab
Artigo em Inglês | LILACS | ID: lil-633875

RESUMO

Eosinophil is considered to be a main protagonist in asthma; however, often discordances between clinical manifestations and response to treatment are observed. We aimed to determine the occurrence of neutrophil predominance in asthma and to identify its characteristics on the basis of clinical-functional features, induced sputum cellular pattern and soluble molecules, to guide the appropriated anti-inflammatory therapy. A total of 41 patients were included in randomized groups: 21-40 year-old, with stable mild-to-severe asthma, steroid-naïve and non-smokers. An induced sputum sample was obtained under basal conditions, a second one after treatment with budesonide (400 µg b.i.d.) or montelukast (10 mg/d) for six weeks, and a final one after a 4-week washout period. By cytospin we evaluated eosinophil (EP) or neutrophil predominance (NP), and in supernatant we determined LTE4, and CC16. Peak expiratory flow variability (PEFV) was measured. A total of 23/41 patients corresponded to EP and 18/41 patients to NP. The PEFV was higher in EP than in NP. LTE4 was higher with NP than with EP. No difference was found for CC16. Montelukast reduced the predominant cell in both subsets, whereas budesonide only reduced eosinophils in EP. Budesonide and montelukast reduced PEFV in EP but not in NP. Considering the total treated-samples in each subset, CC16 level increased significantly in EP. In conclusion: a NP subset of asthmatic patients was identified. These patients show a lower bronchial lability; the leukotriene pathway is involved which responds to anti-leukotriene treatment. This phenotype shows a poor recovery of CC16 level after treatment.


El eosinófilo es considerado la célula protagonista principal en el asma; sin embargo, a menudo se observan discordancias entre las manifestaciones clínicas y la respuesta de los pacientes al tratamiento. Nos propusimos determinar la ocurrencia de predominio de neutrófilos en el asma e identificar las características clínico-funcionales, el patrón celular y las moléculas solubles del esputo inducido, para guiar el tratamiento apropiado anti-inflamatorio. Se incluyeron 41 pacientes: 21 a 40 años de edad, con asma estable leve a grave, no tratados con esteroides tópicos ni sistémicos y no fumadores. Se obtuvo una muestra de esputo inducido en condiciones basales, una segunda muestra después del tratamiento al azar con budesonida (400 µg dos veces al día) o el montelukast (10 mg/d) durante seis semanas, y una final después de un período de lavado de 4 semanas. En el frotis por citocentrifugado se evaluó el predominio de eosinófilos (EP) o neutrófilos (NP), y en el sobrenadante se determinó LTE4, y CC16. Se midió la variabilidad del flujo espiratorio máximo (PEFV). Un total de 23/41 pacientes correspondieron al EP y 18/41 pacientes con NP. El PEFV fue mayor en el EP que en NP. LTE4 fue mayor en NP que en EP. No se encontraron diferencias de los niveles de CC16 en ambos grupos. Montelukast redujo la célula predominante en ambos subgrupos, mientras que budesonida sólo redujo los eosinófilos en EP. Tanto budesonida como montelukast redujeron PEFV en EP, pero no en NP. El nivel de CC16 aumentó significativamente en el EP luego del tratamiento antiinflamatorio. En conclusión: se identificó un subgrupo de asmáticos NP que presentan una menor labilidad bronquial, la vía de los leucotrienos parece estar involucrada y responde al tratamiento anti-leucotrienos. Este fenotipo muestra una escasa recuperación del nivel de CC16 posterior al tratamiento.


Assuntos
Adulto , Feminino , Humanos , Masculino , Adulto Jovem , Antiasmáticos/uso terapêutico , Anti-Inflamatórios/uso terapêutico , Asma/tratamento farmacológico , Eosinófilos/citologia , Neutrófilos/citologia , Escarro/citologia , Acetatos/uso terapêutico , Asma/patologia , Asma/fisiopatologia , Budesonida/uso terapêutico , Contagem de Células , Quimioterapia Combinada , Eosinófilos/efeitos dos fármacos , Neutrófilos/efeitos dos fármacos , Quinolinas/uso terapêutico , Índice de Gravidade de Doença , Método Simples-Cego , Uteroglobina/fisiologia
2.
Medicina (B.Aires) ; 56(3): 273-6, 1996. ilus, graf
Artigo em Inglês | LILACS | ID: lil-181484

RESUMO

The L-Triiodothyronine (L-T3) has a direct influence on the population of somatotrophs in rat pituitary gland. This effect is dose-dependent and induces both proliferation of somatotrophs and striking changes in the synthesis and secretion of grwth hormone (GH). Daily injections of 5 mug L-T3 for 7 days increased significantly the synthesis and storage of GH in pituitary gland, but the GH release was partially blocked. By contrast, injections of 10 mug L-T3 promote rapid synthesis and secretion of GH with removal of the cytoplasmic stores of the hormone and a consequent rise of serum levels. A close correlation was found between levels of stimulation and proliferation or retrogression of lactotroph cell population.


Assuntos
Animais , Masculino , Ratos , Hipófise , Hormônio do Crescimento/efeitos dos fármacos , Tri-Iodotironina/farmacologia , Hipófise/metabolismo , Hormônio do Crescimento/biossíntese , Hormônio do Crescimento/metabolismo , Microscopia Eletrônica , Ratos Wistar , Tri-Iodotironina/administração & dosagem
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