Abstract
This case-control study aimed to investigate whether the levels of Hsp70 (HSPA1A) and Hsp27 (HSPB1) in plasma and lymphocytes were associated with the risk of chronic obstructive pulmonary disease (COPD) among coal workers. A total of 76 COPD cases and 48 age-matched healthy controls from a group of coal workers were included. The case group consisted of 35 COPD patients whose condition was complicated with coal workers’ pneumoconiosis (CWP) and 41 COPD patients without CWP. Heat shock proteins (Hsps) in plasma and lymphocytes were detected by ELISA and flow cytometry, respectively. Multiple logistic regression models were applied to estimate the association between Hsp levels and COPD risk. Our results showed that plasma Hsp70 and lymphocyte Hsp27 levels were significantly higher and plasma Hsp27 levels were significantly lower in COPD cases than in controls (p < 0.01). No significant differences in lymphocyte Hsp70 levels were found between COPD cases and the matched subjects. Higher plasma Hsp70 levels (odds ratio (OR) = 13.8, 95 % confidence interval (CI) = 5.7–33.5) and lower plasma Hsp27 levels (OR = 4.6, 95 % CI = 2.0–10.5) were significantly associated with an increased risk of COPD after adjusting for confounders. Higher lymphocyte Hsp27 levels were only associated with an increased risk of COPD with CWP (OR = 6.6, 95 % CI = 2.0–22.1) but not with an increased risk of COPD without CWP (OR = 3.0, 95 % CI = 0.9–8.9). Additionally, there were strong joint effects of different Hsps on COPD risk. These results showed that higher levels of plasma Hsp70 and lower levels of plasma Hsp27 might be associated with an increased risk of COPD among coal workers. They may have the potential to serve as monitoring markers for COPD in coal workers.
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Acknowledgments
We are particularly grateful to all individuals who voluntarily participated in the study and to the doctors in the Central Hospital of Xishan Coal & Power Company for their generous help in the health examination and sampling of subjects. This study was supported by research funds from the National Basic Research Program of China (2011CB503804) and the National Natural Science Foundation of China (81372967).
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Cui, X., Xing, J., Liu, Y. et al. COPD and levels of Hsp70 (HSPA1A) and Hsp27 (HSPB1) in plasma and lymphocytes among coal workers: a case-control study. Cell Stress and Chaperones 20, 473–481 (2015). https://doi.org/10.1007/s12192-015-0572-5
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DOI: https://doi.org/10.1007/s12192-015-0572-5