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http://dx.doi.org/10.15269/JKSOEH.2021.31.3.286

Influencing Factors of Peripheral Blood Lymphocyte subsets in Workers with Chronic Obstructive Pulmonary Disease Exposed to Inorganic Dust  

Baek, Jin Ee (Institute of Occupation and Environment, Korea Workers' Compensation & Welfare Service)
Shin, Jae Hoon (Institute of Occupation and Environment, Korea Workers' Compensation & Welfare Service)
Hwang, Joo Hwan (Institute of Occupation and Environment, Korea Workers' Compensation & Welfare Service)
Lee, Youlim (Institute of Occupation and Environment, Korea Workers' Compensation & Welfare Service)
Lee, Jong Seong (Institute of Occupation and Environment, Korea Workers' Compensation & Welfare Service)
Choi, Byung-Soon (Institute of Occupation and Environment, Korea Workers' Compensation & Welfare Service)
Publication Information
Journal of Korean Society of Occupational and Environmental Hygiene / v.31, no.3, 2021 , pp. 286-293 More about this Journal
Abstract
Objectives: Inorganic dust is known to be a risk factor for chronic obstructive pulmonary disease (COPD) regardless of smoking and pneumoconiosis. Adaptive and innate immunity, including lymphocyte infiltrate, are involved in the pathogenesis of COPD. The purpose of this study was to analyze the lymphocyte subsets in the blood of workers exposed to inorganic dust and confirm the influencing factors. Methods: The general characteristics of the subjects (n=107) were analyzed through a personal questionnaire. Diagnosis of COPD was established according to pulmonary function tests with FEV1/FVC post bronchodilator lower than 70%, according to the Global Initiative for Chronic Obstructive Lung Disease (GOLD) guidelines. For lymphocyte analysis, blood was stained with a fluorescent CD marker and analyzed by flow cytometry. Results: The increase in CD4+ T lymphocytes was associated with a decrease in age (𝛽=-0.273, p=0.008) and an increase in the cumulative smoking amount (𝛽=0.205, p=0.034). The increase in NK cells was associated with an increase in age (𝛽=0.325, p=0.001) and a decrease in cumulative smoking (𝛽=-0.220, p=0.019). The period of exposure to dust, %FVC predicted and %FEV1/FVC, and the relative population of peripheral blood lymphocytes did not show a statistically significant relationship. Conclusions: CD4+ T lymphocytes and CD56+CD16+ NK cells in peripheral blood were more related to age and cumulative smoking than the duration of dust exposure. Age and smoking are major risk factors for the development of COPD, so it can be predicted that peripheral blood CD4+ T lymphocytes and CD56+CD16+ NK cells are related to the development of COPD in workers exposed to inorganic dust.
Keywords
COPD; $CD4^+$ T lymphocytes; $CD56^+CD16^+$ NK cells; age; smoking;
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