Pilot Study of Pioglitazone for the Treatment of Moderate to Severe Asthma in Obese Asthmatics (Glitz Asthma) (GLITZ)
A Randomized, Placebo-Controlled Pilot Study of Pioglitazone for the Treatment of Moderate to Severe Asthma in Obese Asthmatics. (The GLITZ Asthma Study)
Asthmatics who are significantly overweight tend to have more severe symptoms, more flare ups, and are more likely to have poorly-controlled asthma when compared to other asthmatics.
Researchers believe this occurs because excess adipose tissue (fat) in the bosy can cause higher-than-normal levels of leptin and lower levels of adiponectin in the blood.
The researchers of this study are testing a medication called pioglitazone in overweight asthmatics because they believe it can help regulate leptin and adiponectin and that this may improve symptoms of asthma.
Descripción general del estudio
Estado
Intervención / Tratamiento
Descripción detallada
Participants in this study will be randomly assigned (like the flip of a coin) to pioglitazone or placebo (an inactive pill). They will be given study medication to take every day for 12 weeks (3 months).
Participants will complete a number of asthma-related questionnaires and a variety of pulmonary function tests. Participants will undergo physical exams, an electrocardiogram, and blood sampling to measure leptin, adiponectin, markers of inflammation, blood cell counts, glucose levels, BNP hormone levels, and liver function.
To monitor participants throughout the study, follow-up visits will be done at 2, 6, and 12 weeks after starting study drug. At these visits many of the pulmonary function tests and questionnaires will be repeated.
Tipo de estudio
Inscripción (Actual)
Fase
- Fase 2
Contactos y Ubicaciones
Ubicaciones de estudio
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Vermont
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Colchester, Vermont, Estados Unidos, 05446
- The Vermont Lung Center at the University of Vermont
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Criterios de participación
Criterio de elegibilidad
Edades elegibles para estudiar
Acepta Voluntarios Saludables
Géneros elegibles para el estudio
Descripción
Inclusion Criteria:
- Asthma diagnosed by a physician at least 1 year prior to study enrollment
- Poorly-controlled asthma at study enrollment
- Non smokers (stopped smoking at least 1 year ago) and limited lifetime history of smoking
- Body mass index 30-60
- Responds to methacholine challenge test with PC20 of <16 mg/ml
- On a stable dose of inhaled corticosteroid for at least 4 weeks prior to study entry
- FEV1 > 60% predicted
- Able to obtain weekly weights at home
Exclusion Criteria:
- Systemic steroids within the past 4 weeks
- Lung pathology other than asthma
- Other significant non-pulmonary co-morbidities such as: coronary artery disease, peripheral vascular disease, cerebrovascular disease, congestive heart failure with an ejection fraction <50%, liver disease or elevated liver enzymes at baseline, malignancy (excluding non-melanoma skin cancers), AIDS, renal failure with serum creatinine >3.0, or disorders requiring steroid treatment such as vasculitis, lupus, rheumatoid arthritis
- B-type natriuretic peptide (BNP) >400pg/ml
- Pregnant or lactating
- Currently taking a beta blocker, a CYP2C8 inhibitor or inducer such as gemfibrozil or rifampin, a TZD (thiazolidinedione), or allergic to TZD
- Taking antioxidants (if taking a multivitamin must be on a stable regimen prior to enrollment)
- Illicit drug use within the past year
- Current/active upper respiratory infection (if active URI, wait until asymptomatic for 1 week to enroll)
- Asthma exacerbation within the past 4 weeks (includes ER, urgent care, or hospital visits due to asthma resulting in an increase in asthma-related medications)
- Undergoing evaluation for sleep apnea, or plans to institute treatment for sleep apnea (patients on a stable treatment regimen for sleep apnea for the last 3 months will be allowed to participate)
- Clinically significant abnormalities present on screening 12-lead electrocardiogram
- Women of childbearing potential using oral contraceptives who are not willing to use a second method of contraception during the study
Plan de estudios
¿Cómo está diseñado el estudio?
Detalles de diseño
- Propósito principal: Tratamiento
- Asignación: Aleatorizado
- Modelo Intervencionista: Asignación paralela
- Enmascaramiento: Cuadruplicar
Armas e Intervenciones
Grupo de participantes/brazo |
Intervención / Tratamiento |
|---|---|
|
Comparador de placebos: 2
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Matching placebo (inert tablet)
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Comparador activo: 1
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Pioglitazone tablets; 30 mg/day for 2 weeks; then increased to 45 mg/day until week 12 (approximately 3 months)
|
¿Qué mide el estudio?
Medidas de resultado primarias
Medida de resultado |
Medida Descripción |
Periodo de tiempo |
|---|---|---|
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PC20
Periodo de tiempo: 12 weeks
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Airway reactivity will be measured with methacholine challenge testing following ATS guidelines. This is the concentration of methacholine that produces a 20% decrease in lung function (measured by forced expiratory volume in 1 second) |
12 weeks
|
Colaboradores e Investigadores
Patrocinador
Investigadores
- Investigador principal: Anne E Dixon, MD, The Vermont Lung Center at the University of Vermont
Publicaciones y enlaces útiles
Publicaciones Generales
- Hashimoto Y, Nakahara K. Improvement of asthma after administration of pioglitazone. Diabetes Care. 2002 Feb;25(2):401. doi: 10.2337/diacare.25.2.401. No abstract available.
- Lee KS, Kim SR, Park SJ, Park HS, Min KH, Jin SM, Lee MK, Kim UH, Lee YC. Peroxisome proliferator activated receptor-gamma modulates reactive oxygen species generation and activation of nuclear factor-kappaB and hypoxia-inducible factor 1alpha in allergic airway disease of mice. J Allergy Clin Immunol. 2006 Jul;118(1):120-7. doi: 10.1016/j.jaci.2006.03.021. Epub 2006 May 19.
Enlaces Útiles
Fechas de registro del estudio
Fechas importantes del estudio
Inicio del estudio
Finalización primaria (Actual)
Finalización del estudio (Actual)
Fechas de registro del estudio
Enviado por primera vez
Primero enviado que cumplió con los criterios de control de calidad
Publicado por primera vez (Estimar)
Actualizaciones de registros de estudio
Última actualización publicada (Estimar)
Última actualización enviada que cumplió con los criterios de control de calidad
Última verificación
Más información
Términos relacionados con este estudio
Palabras clave
Términos MeSH relevantes adicionales
- Enfermedades de las vías respiratorias
- Enfermedades del sistema inmunológico
- Enfermedades pulmonares
- Hipersensibilidad, Inmediata
- Enfermedades bronquiales
- Enfermedades Pulmonares Obstructivas
- Hipersensibilidad Respiratoria
- Hipersensibilidad
- Asma
- Agentes hipoglucemiantes
- Efectos fisiológicos de las drogas
- Pioglitazona
Otros números de identificación del estudio
- GLITZ Asthma
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