Oxidative Stress Biomarkers to Monitor and Early Detect Health Impairment in Workers Exposed to Silica (Caesar Stone)

Tel-Aviv Sourasky Medical Center150 enrolled

Overview

Silicosis is well-known occupational disease caused by free crystalline silica (silicon dioxide) and is marked by inflammation and pulmonary fibrosis. There are cumulative evidences that exposure to Caesar stone (quartz surface products that manufactured from up to 93% quartz, polymer resins and pigments) is particularly dangerous to exposed workers. Goals: To examine marble workers exposed to Caesar Stone in order to propose a working plan of surveillance and prevention by biological monitoring.

Study participants would be recruited during two years of the study. They will be asked to come to a single visit at Pulmonary Laboratory of Tel Aviv Medical Center. During the meeting, participants will be given a precise explanation about the tests they will perform and after signing the informed consent will perform following tests: 1. Induced sputum (IS) - will be done after pretreatment with short acting beta-2 agonist and 3% saline will be administrated by an ultrasonic nebulizer for up to 20 min. Differential cell count, particle size distribution test of the particulate matter (with a Eyetech Analyzer (Ankersmid, Yokneam, Israel)will be done from IS samples and evaluation the activity of Heme oxygenase 1 (HO-1) protein from IS supernatants. 2. EBC-Exhaled Breath Condensate-will be done by condensation expiratory air and particulate matter and markers of oxidation will be measured. 3. Participants will be asked to complete occupational questionnaire. 4. Pulmonary function tests (PFTs): The measurement will be performed using standard protocols according to American Thoracic Society/European Respiratory Society (ATS/ERS) guidelines. Including Lung diffusion testing. Laboratory tests of induced sputum and EBC will be done within a week of a participant visit. Analysis of data will be done after the completion of data collection and laboratory tests.

Study Type

OBSERVATIONAL

Enrollment

150

Conditions

Silicosis

Eligibility

Sex: MALEMin age: 18 YearsMax age: 70 YearsHealthy volunteers:

Medical Language ↔ Plain English

Inclusion Criteria: 1. male 2. 18-70 years old 3. At least six months of professional exposure to Caesar stone Exclusion Criteria: 1. Other occupational exposure (welding of any kind) 2. Chronic Obstructive Pulmonary Disease (COPD), tuberculosis, asthma, autoimmune disease in healthy exposed workers 3. Interstitial lung disease in exposed workers with clinically approved silicosis

Locations (1)

Pulmonary Laboratory of Tel Aviv Sourasky Medical Center

Tel Aviv, Israel

Outcomes

Primary Outcomes

Evidence of clinically definite silicosis according to ATS/ERS guidelines

1. Occupational physician examination 2. Pulmonary function tests (PFTs): The measurement will be performed using standard protocols according to ARS/ERS guidelines. Including Lung diffusion testing 3. Computed Tomography (CT) test if need

Time frame: one day

Secondary Outcomes

Particle size distribution of the particulate matter

Particle size distribution test of the particulate matter (with a Eyetech Analyzer (Ankersmid, Yokneam, Israel) will be done from Induced sputum (IS) samples and EBC-Exhaled Breath Condensate.

Time frame: one day

The activity of Heme oxygenase 1 (HO-1) protein

Evaluation the activity of Heme oxygenase 1 (HO-1) protein will be done from Induced sputum (IS) supernatants.

Time frame: one day

Differential cell count

Differential cell count will be done from Induced sputum (IS) samples.

Time frame: one day

Markers of oxidation

Markers of oxidation will be measured will be measured in EBC-Exhaled Breath Condensate.

Time frame: one day