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Epigenetics, DNA Methylation Patterns and Periodontal Disease (SZU)

20 de julio de 2011 actualizado por: University of North Carolina, Chapel Hill

Host DNA Methylation Patterns in Association With Periodontal Disease : MiRNA Changes in Obesity

The overall goal of this research is (1) to identify changes in gene expression and DNA methylation status in subjects who exhibit advanced chronic periodontal inflammation and (2) to identify microRNAs (miRNAs) and the interactive pathways associated with obesity as a modifier of periodontal infection pathogenesis.

Descripción general del estudio

Estado

Terminado

Condiciones

Descripción detallada

Aim 1. To determine whether diseased periodontal tissues biopsied from patients with periodontal disease will have altered DNA methylation patterns of selected genes as compared to the DNA methylation status biopsies obtained from adjacent, non-diseased periodontal sites, as well as periodontal biopsy samples obtained from non-diseased, healthy subjects.

Aim 2. To determine the role of tissue DNA Methylation on mRNA expression:

  • 2a. To determine whether alterations in tissue mRNA expression (as determined by quantitative PCR) are associated with an aberrant DNA methylation status of respective gene promoter CpG islands in tissue biopsy samples obtained from diseased and non-diseased tissues from patients with periodontal disease and from non-diseased healthy subjects.
  • 2b. By performing laser capture microdissection of biopsy samples from diseased patients [(epithelium, connective tissue and inflammatory infiltrate)] we seek to determine cellular patterns of mRNA expression and DNA methylation of targeted genes comparing inflamed to non-inflamed sites within diseased patients.
  • 2c. We will perform in vitro studies to analyze whether gingival fibroblasts from patients with periodontal disease will show a differential methylation pattern and whether these cells will display a differential inflammatory response when compared to control fibroblasts isolated from healthy subjects.

Aim 3. The aim of this pilot investigation was to determine if miRNA expression differed in the presence or absence of obesity, comparing gingival biopsies obtained from patients with or without periodontal disease.

  • 3a. To determine whether diseased periodontal tissues biopsied from patients with periodontal disease will influence the level of miRNA expression as compared to the biopsies obtained from non-diseased, healthy subjects.
  • 3b. To determine whether BMI [nonobese subjects BMI <30kg/m2, obese subjects >30kg/m2] will influence the level of miRNA expression in biopsies from diseased periodontal tissues as compared to periodontal biopsy samples obtained from non-diseased, healthy subjects.

Gingival samples, gingival crevicular fluid, saliva and plaque samples will be collected and a periodontal examination will be performed. The periodontal assessment will record pocket depth, clinical attachment level and percent bleeding on probing. Blood pressure, height and weight (Body Mass Index assessment) will be obtained on participants as well.

Tissue gene expression by quantitative PCR and DNA methylation sequence analysis, proteomic analyses of gingival crevicular fluid, Differential Methylation Hybridization and, microRNA expression profile by Human miRNA Microarray and Real-time PCR quantification will all be performed.

Tipo de estudio

De observación

Inscripción (Actual)

98

Contactos y Ubicaciones

Esta sección proporciona los datos de contacto de quienes realizan el estudio e información sobre dónde se lleva a cabo este estudio.

Ubicaciones de estudio

  • Estados Unidos
    • North Carolina
      • Chapel Hill, North Carolina, Estados Unidos, 27599
        • Center for Oral and Systemic Diseases

Criterios de participación

Los investigadores buscan personas que se ajusten a una determinada descripción, denominada criterio de elegibilidad. Algunos ejemplos de estos criterios son el estado de salud general de una persona o tratamientos previos.

Criterio de elegibilidad

Edades elegibles para estudiar

18 años a 65 años (Adulto, Adulto Mayor)

Acepta Voluntarios Saludables

Sí

Géneros elegibles para el estudio

Todos

Método de muestreo

Muestra de probabilidad

Población de estudio

Ninety-eight subjects will be recruited from the Graduate Periodontics Clinic and Dental Faculty Practice at the University of North Carolina School of Dentistry and if needed from the general population. Subjects must present with either chronic periodontitis or periodontal health.

Descripción

Inclusion Criteria:

  • Subjects must be adult males or females between the ages of 18 and 65 years (inclusive).
  • Subjects must be able and willing to follow study procedures and instructions.
  • Subjects must have read, understood and signed an informed consent form.
  • Subjects must present with at least 20 teeth in the functional dentition, excluding third molars.
  • Subjects must be in good general health.
  • Subjects must present with advanced chronic periodontitis (American Dental Association Class 4) as determined by the investigator or designee during the screening periodontal examination. Such subjects will exhibit periodontal pocketing (>5 mm and Bleeding on Probing) and severe alveolar bone loss. Subjects will be under active care for periodontitis and will be treatment planned for periodontal flap surgery.
  • Control subjects must present with periodontal health as determined by the investigator or designee during the screening periodontal examination. Such subjects will exhibit no evidence of periodontal pocketing (pockets ≤4mm), and no bleeding on probing at the site of the biopsy. Patients from this group will be treatment planned for routine crown extension procedures for restorative reasons, or be volunteers from the general population meeting the inclusion criteria.
  • 24 subjects from group 2 will be enrolled based on Body Mass Index (BMI). Twelve obese subjects (BMI of 30 or greater) and twelve non-obese subjects (BMI less than 30) will be enrolled. Twelve from the obese and twelve from the non-obese group will be split in half based on periodontal status.
  • 6 periodontal healthy non-obese
  • 6 periodontal healthy obese
  • 6 periodontal diseased non-obese
  • 6 periodontal diseased obese

Exclusion Criteria:

  • Individuals who have a chronic disease with oral manifestations.
  • Individuals who exhibit gross oral pathology.
  • Treatment with antibiotics for any medical or dental condition within 1 month prior to the screening examination.
  • Chronic treatment (i.e., two weeks or more) with any medication known to affect periodontal status (e.g., phenytoin, calcium antagonists, cyclosporin, coumadin, non-steroidal anti-inflammatory drugs, aspirin) within one month of the screening examination.
  • Ongoing medications initiated less than three months prior to enrollment (i.e., medications for chronic medical conditions must be initiated at least three months prior to enrollment).
  • Subjects with clinically significant organ disease including impaired renal function, or any bleeding disorder.
  • Subjects with active infectious diseases such as hepatitis, HIV or tuberculosis.
  • Severe unrestored caries, or any condition that is likely to require antibiotic treatment over the trial, including the need for prophylactic antibiotic

Plan de estudios

Esta sección proporciona detalles del plan de estudio, incluido cómo está diseñado el estudio y qué mide el estudio.

¿Cómo está diseñado el estudio?

Detalles de diseño

Cohortes e Intervenciones

Grupo / Cohorte
MicroRNA study
Obese group (+ periodontitis group) Non-obese group (+ periodontitis group)
DNA methylation study
Periodontitis group Healthy periodontium group

¿Qué mide el estudio?

Medidas de resultado primarias

Medida de resultado
Periodo de tiempo
DNA methylation patterns of selected candidate genes
Periodo de tiempo: Visit 1
Visit 1

Medidas de resultado secundarias

Medida de resultado
Periodo de tiempo
Identification of miRNA species
Periodo de tiempo: Visit 1
Visit 1

Colaboradores e Investigadores

Aquí es donde encontrará personas y organizaciones involucradas en este estudio.

Patrocinador

University of North Carolina, Chapel Hill

Colaboradores

National Institute of Dental and Craniofacial Research (NIDCR)

Investigadores

  • Investigador principal: Steven Offenbacher, DDS, MS, PhD, University of North Carolina, Chapel Hill

Fechas de registro del estudio

Estas fechas rastrean el progreso del registro del estudio y los envíos de resultados resumidos a ClinicalTrials.gov. Los registros del estudio y los resultados informados son revisados ​​por la Biblioteca Nacional de Medicina (NLM) para asegurarse de que cumplan con los estándares de control de calidad específicos antes de publicarlos en el sitio web público.

Fechas importantes del estudio

Inicio del estudio

1 de octubre de 2007

Finalización primaria (Actual)

1 de febrero de 2011

Finalización del estudio (Actual)

1 de febrero de 2011

Fechas de registro del estudio

Enviado por primera vez

12 de julio de 2011

Primero enviado que cumplió con los criterios de control de calidad

20 de julio de 2011

Publicado por primera vez (Estimar)

21 de julio de 2011

Actualizaciones de registros de estudio

Última actualización publicada (Estimar)

21 de julio de 2011

Última actualización enviada que cumplió con los criterios de control de calidad

20 de julio de 2011

Última verificación

1 de julio de 2011

Más información

Términos relacionados con este estudio

Palabras clave

Términos MeSH relevantes adicionales

Otros números de identificación del estudio

  • 07-0749
  • 1R01DE021052-01 (Subvención/contrato del NIH de EE. UU.)

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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