- ICH GCP
- Registro de ensayos clínicos de EE. UU.
- Ensayo clínico NCT02808715
Identification and Metabolic Characterization of a Cohort of Human Subjects With Mutations in PRDM-16
Chinese male subjects will be invited to participate in a research study of brown fat, a special tissue in the body that is designed to burn energy to make heat. The objective is to learn the importance of a gene called "PRDM-16" for the function of brown fat. Subjects were selected as a possible subject in this study because they fulfil the age and weight criteria.
500 subjects from the Singhealth Investigational Medicine Unit healthy volunteer database will be recruited over a period of 2 years. All of the subjects will have their PRDM-16 gene sequenced. The objective is to identify subjects with mutations, or changes, in their PRDM-16 gene. About 12 subjects with PRDM-16 mutations are expected to be identified.
Samples of blood obtained during the course of this study will be stored and analysed only for the purposes of this study for a period not exceeding 2 years, and will be destroyed after completion of the study, unless subject is agreeable to donate the samples to the National Heart Centre Singapore for continuous storage for future studies that are approved by the institutional review board..
Descripción general del estudio
Estado
Condiciones
Intervención / Tratamiento
Descripción detallada
The long-term objective of this study is to develop new treatments for obesity and obesity-associated disorders such as diabetes and dyslipidemia. The recent finding of active brown fat depots in adult humans provides an exciting new strategy for the treatment of these diseases. Brown fat is a specialized organ found primarily in small mammals. Brown fat has the unique capability to burn fuel at high rates in order to generate heat. The role of brown fat in mammals is to defend against cold exposure. Human infants have active brown fat deposits located in the intra-scapular region. This brown fat depot regresses with age and it was long thought that adult humans had no brown fat tissue. Recent studies have demonstrated the presence of brown fat activity in adult humans following exposure to cold. Brown fat in adult humans is concentrated in the cervical region and displays some sex-specific differences. Furthermore the size of the depot is inversely correlated with BMI and age of the subjects. This finding has generated intense interest as it opens up the possibility of harnessing brown fat as a means of combating obesity and obesity-related disorders in man. Indeed, maneuvers that activate brown fat in humans have been shown to cause reductions in fat mass.
Much of our understanding of brown fat biology comes from work in mice. Of particular relevance for the treatment of human disease are several findings. First, increasing brown fat activity in mice renders the animals resistant to the development of obesity on a high fat diet. Second, levels of insulin sensitivity are directly related to brown fat activity. Finally, the transcription factor factor PR-domain containing protein 16 (PRDM-16) is crucial for directing the biology of brown fat.
The overall goal of the study is to translate the findings from mouse studies of brown fat into human subjects. This is an important first step in the process of developing brown fat-targeted therapies to treat human metabolic diseases such as obesity and insulin resistance. In view of this the investigators are interested in answering several questions. First, do humans with mutations in PRDM-16 have defects in brown fat activity? Recently, humans with mutations in PRDM-16 were identified and found to have a cardiomyopathy phenotype. The brown fat function in these individuals has not been described. By employing a genetic screen of volunteers the investigators hope to identify subjects in Singapore with defects in PRDM-16. Prior studies in humans suggest that the size of the brown fat depot is inversely correlated with BMI and age of the subjects and that depot size varies between the sexes. In order to eliminate BMI, age and sex as confounding variables the investigators will include male subjects of Chinese race between the ages of 21 and 50 and with BMI greater than 18.5 but less than 30. The investigators will include only Chinese subjects to avoid confounding our initial study with variables that relate to race of the subjects. The identification of human subjects carrying mutations in PRDM-16 will set the stage for further studies that will attempt to several research questions. These include whether humans with PRDM-16 mutations have defects in brown fat and the metabolic consequences for humans with defective brown fat.
Tipo de estudio
Inscripción (Actual)
Criterios de participación
Criterio de elegibilidad
Edades elegibles para estudiar
Acepta Voluntarios Saludables
Géneros elegibles para el estudio
Método de muestreo
Población de estudio
Descripción
Inclusion Criteria:
- Male
- Chinese
- Age >= 21 and =< 50
- BMI >=18.5 and =< 30
- Ability to provide written, informed consent.
- To control for this the investigators will include only adult Chinese men less than 50 years old.
- Since obesity also alters brown fat function the investigators will exclude those with BMI>30.
Exclusion Criteria:
- Diagnosis of DM2
- Use of beta blockers, TZD (ie rosiglitazone/pioglitazone) or metformin Since the subjects will be recruited from the IMU healthy volunteer database there should be no prior history of DM2 or medication use. Nevertheless, diagnosis of DM2 and use of the drugs listed can alter brown fat activity and interfere with our analysis.
- Presence of pacemakers or foreign metallic objects in the eyes. Future planned experiments with the identified cohort include cardiac MRI. Subjects with pacemakers or foreign metallic objects in the eyes will be ineligible for this potential follow-up study.
Plan de estudios
¿Cómo está diseñado el estudio?
Detalles de diseño
¿Qué mide el estudio?
Medidas de resultado primarias
Medida de resultado |
Periodo de tiempo |
---|---|
Number of participants with deleterious mutations in the PRDM-16 locus, using standard genomic methods
Periodo de tiempo: 1 year
|
1 year
|
Colaboradores e Investigadores
Patrocinador
Investigadores
- Investigador principal: Tan Ru San, MBBS, National Heart Centre Singapore
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
Términos MeSH relevantes adicionales
Otros números de identificación del estudio
- 2014/337/C
Plan de datos de participantes individuales (IPD)
¿Planea compartir datos de participantes individuales (IPD)?
Esta información se obtuvo directamente del sitio web clinicaltrials.gov sin cambios. Si tiene alguna solicitud para cambiar, eliminar o actualizar los detalles de su estudio, comuníquese con register@clinicaltrials.gov. Tan pronto como se implemente un cambio en clinicaltrials.gov, también se actualizará automáticamente en nuestro sitio web. .
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