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Completed

NCT Number: NCT03371446

DNA Methylation Profile of the SOCS-1 Gene Promoter in Smokers Patients With Chronic Periodontitis.

Periodontitis is related to host genetics, constitution of the dental biofilm and environmental factors such as smoking. DNA methylation is a mechanism of genetic expression that can inhibit or silence gene expression. In this way several researchers have been dedicated to study the genetic influence on the susceptibility and / or increased risk to periodontal disease. Studies have reported association between several epigenetic biomarkers with periodontal inflammation. Considering the hypothesis that there is an association between smoking and methylation in genes related to periodontal disease, the objective of this study was to verify the DNA methylation pattern in oral epithelial cells of patients with chronic periodontitis (CP) in the promoter of a specific gene involved in the control of inflammation, as suppressor of cytokine signaling (SOCS) 1 in smokers and nonsmokers patients.

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Key information

Conditions

Periodontal Diseases Epigenetics Mouth Diseases Stomatognathic Diseases

Age range

30 year and older

Sex eligibility

All sexes

Study type

Observational

Primary location

Arthur Belem Novaes Junior

Ribeirão Preto, São Paulo, 14040-904, Brazil

About this study

This was an experimental type study with parallel controls, comparing two groups, a group with consumption of 10 minimum cigarettes per day, with a diagnosis of chronic periodontitis. And another control group were non-smokers with chronic periodontitis. For this, genomic DNA was purified from oral epithelial cells obtained by rinsing with 3% sucrose, for a single time of collection, patients received periodontal treatment after collection and data analysis. The DNA was modified by Sodium bisulfite and the methylation patterns of the DNA were analyzed with the MSPCR technique (Polymerase chain reaction). This study was approved by the Institutional Review Board of the School of Dentistry of Ribeirão Preto (CAAE:57171816.2.0000.5419 ), and all patients need to provide written informed consent.

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Chronic Periodontitis carriers - presence of proximal insertion loss ≥5 mm in more than 30% of the teeth present.
  • Periodontal pocket ≥ 5mm
  • Smokers who have smoked 10 or more cigarettes per day for the past five years.
  • No positive history of basic periodontal treatment in the last six months.

Exclusion criteria

  • Extensive prosthetic involvement.
  • Using anti-inflammatories.
  • Pregnant or nursing.
  • Presence of systemic alterations that compromise host response or require prophylactic medication for treatment.
  • History of constant use of oral antiseptics in the last six months.

Treatment and study plan

oral epithelial cells obtained by rinsing with 3% sucrose

Genetic

rinsing with 3% sucrose, for a single time of collection, patients received periodontal treatment after collection and data analysis.

Primary outcomes

  1. Extraction of genomic DNA from oral epithelial cells

    Time frame: Baseline (at the beginning of the study)

    Epithelial cells were collected after mouthwash with 5ml dextrose autoclaved 3% and stored under refrigeration at -20ºC. After collection, the samples were taken to the Epigenetics and Reproduction Laboratory of the Department of Genetics of the Medical School of Ribeirão Preto-USP (FMRP-USP) where nucleic acid extraction and molecular analysis were performed.

    After thawing the saliva, 2ml of each sample collected were transferred separately to eppendorf tubes, for processing. The material was then diluted in 50 μl of cobalt Mili-Q water, incubated at 37 ° C in a water bath for 1 hour and stored in a freezer at -20 ° C. At the end, DNA quality, purity and integrity were measured using a spectrophotometer (NanoDrop 2000-Thermo Scientific), using OD 260/280 and 260/230. Considering ideal values for both reasons, between 1.8 and 2.2.

Secondary outcomes

  1. Probing pocket depth (PD)

    Time frame: Baseline (at the beginning of the study)

    Clinical parameter was recorded at baseline by one trained periodontist.Probing pocket depth (PD) was measured from the free gingival margin to the bottom of the periodontal pocket and clinical attachment level ( CAL) was measured from the cementum-enamel junction (CEJ) to the bottom of periodontal pocket.

    Probing measurement was performed using a manual University of North Carolina - UNC Periodontal probe (Hu- Friedy, Chicago, IL, USA).

  2. Plaque index (PI)

    Time frame: Baseline (at the beginning of the study)

    Clinical parameter was recorded at baseline by one trained periodontist. Plaque index (PI) was used to assess the oral hygiene status of the patients, the evaluation was done with the unit of measure in percentage (%) whole mouth. Probing measurement was performed using a manual University of North Carolina - UNC Periodontal probe (Hu- Friedy, Chicago, IL, USA).

  3. Bleeding on probing (BOP)

    Time frame: Baseline (at the beginning of the study)

    Clinical parameter was recorded at baseline by one trained periodontist.Bleeding on probing (BOP) was recorded based on the presence or absence of bleeding up to 30 seconds after probing on four sides of each tooth,the evaluation was done with the unit of measure in percentage (%) whole mouth. Probing measurement was performed using a manual University of North Carolina - UNC Periodontal probe (Hu- Friedy, Chicago, IL, USA).

Sponsors and collaborators

Lead sponsor

University of Sao Paulo

Other

Registry information

Official study title

Effect of Smoking on the DNA Methylation Profile of the SOCS 1 Gene Promoter in Oral Mucosal Epithelial Cells of Individuals With Chronic Periodontitis (Smokers and Nonsmokers).

Important dates

Study start
2016
Primary completion
2017
Study completion
2017
First posted
Dec 13, 2017
Registry last updated
Dec 13, 2017

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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