Abstract
Purpose
Found in inflammatory zone 2 (FIZZ2) is associated with lung inflammation. The aim of the study was to investigate the expression and utility of FIZZ2 as a marker for chronic obstructive pulmonary disease (COPD).
Methods
Immunohistochemistry was used to detect the expression of FIZZ2 in COPD. The serum concentration of FIZZ2 was measured by enzyme-linked immunosorbent assay and the episodes of acute exacerbations of COPD (AECOPD) in the following year were recorded.
Results
FIZZ2 expression was elevated in bronchial epithelial cells (0.217 ± 0.021 vs 0.099 ± 0.010, p < 0.0001) and negatively correlated with the pulmonary function (FEV1/FVC%) (p = 0.0149) and positively correlated with the smoking index (p = 0.0241). Serum level of FIZZ2 in COPD were significantly higher than that in healthy controls (561.6 ± 70.71 vs 52.24 ± 20.52 pg/ml, p < 0.0001) and increased with the COPD severity. Serum levels of FIZZ2 negatively correlated with the pulmonary function [Forced Vital Capacity (FVC), Forced Expiratory Volume (FEV1), FEV1%, FEV1/FVC) (r = − 0.3086, − 0.3529, − 0.3343, and − 0.2676, respectively, p = 0.0003, p < 0.0001, p < 0.0001, p = 0.0014). The expression of human serum FIZZ2 was positively correlated with the smoking index (r = 0.2749, p = 0.0015). There was a positive correlation between the FIZZ2 concentration and the frequency of AECOPD episodes in the following year (r = 0.7291, p < 0.0001).
Conclusion
FIZZ2 expression was elevated in patients with COPD and its serum concentration might be a potential biomarker for AECOPD.
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Data Availability
The datasets analyzed during the current study are available in the GitHub repository at https://github.com/pivadoc/Surfactant/issues/1.
Abbreviations
- FIZZ2:
-
Found in inflammatory zone 2
- COPD:
-
Chronic obstructive pulmonary disease
- CSE:
-
Cigarette smoke extract
- 16HBEs:
-
Human bronchial epithelial
- AECOPD:
-
Acute exacerbations of COPD
- BECs:
-
Bronchial epithelial cells
- RELMs:
-
Resistin-like molecules
- ELISA:
-
Enzyme-linked immunosorbent assay
- ANOVA:
-
Analysis of variance
- FEV1:
-
Forced expiratory volume in one second
- FVC:
-
Forced vital capacity
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Acknowledgements
Thanks to Yunhui Wu, Man Jia, Yaqi Meng, and Jiayan Xu for their experimental technical help.
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YZ and XY designed this study; YQ and JZ collected serum samples; YZ conducted experiments, data analysis and interpretation; YZ wrote the manuscript; XY and IMA strictly revised the manuscript. All authors read and approved the final paper.
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Ying Zhou, Xin Yao, Yingying Qiao, Jun Zhou, and Ian M. Adcock have nothing to disclose.
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The protocol was approved by the ethics committee of The First Affiliated Hospital of Nanjing Medical University (2014-SR-150).
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Zhou, Y., Qiao, Y., Adcock, I.M. et al. FIZZ2 as a Biomarker for Acute Exacerbation of Chronic Obstructive Pulmonary Disease. Lung 199, 629–638 (2021). https://doi.org/10.1007/s00408-021-00483-1
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DOI: https://doi.org/10.1007/s00408-021-00483-1