Abstract
PurposeChronic obstructive pulmonary disease (COPD) is a complex and persistent lung disease and lack of biomarkers. The aim of this study is to screen and verify effective biomarkers for medical practice.MethodsDifferential expressed genes analysis and weighted co-expression network analysis were used to explore potential biomarker. Gene Ontology (GO) enrichment, Kyoto Encyclopedia of Genes and Genomes (KEGG) analysis and Gene set enrichment analysis (GSEA) analysis were used to explore potential mechanism. CIBERSORTx website was used to evaluate tissue-infiltrating immune cells. Enzyme-linked immunosorbent assay (ELISA) was used to assess the concentrations of the Lp-PLA2 in serum.ResultsTen genes were selected via combined DEGs and WGCNA. Furthermore, PLA2G7 was choose based on validation from independent datasets. Immune infiltrate and enrichment analysis suggest PLA2G7 may regulate immune pathway via macrophages. Next, Lp-PLA2(coded by PLA2G7 gene) level was upregulated in COPD patients, increased along with The Global Average of COPD (GOLD) stage. In additional, Lp-PLA2 level was significant correlate with FEV1/FVC, BMI, FFMI, CAT score, mMRC score and 6MWD of COPD patients. Finally, the predictive efficiency of Lp-PLA2 level (AUC:0.796) and derived nomogram model (AUC:0.884) in exercise tolerance was notably superior to that of the sit-to-stand test and traditional clinical features.ConclusionLp-PLA2 is a promising biomarker for COPD patients and is suitable for assessing exercise tolerance in clinical practice.
Highlights
Chronic obstructive pulmonary disease (COPD) is a complex and persistent lung disease, kills more than 3 million people worldwide every year [1]
Lp-PLA2(coded by PLA2G7 gene) level was upregulated in COPD patients, increased along with The Global Average of COPD (GOLD) stage
Lp-PLA2 is a promising biomarker for COPD patients and is suitable for assessing exercise tolerance in clinical practice
Summary
Chronic obstructive pulmonary disease (COPD) is a complex and persistent lung disease, kills more than 3 million people worldwide every year [1]. It is needed to have a better understanding of the complex disease mechanisms and explore better biomarkers to assess and monitor disease risk and prognosis. Impaired exercise tolerance is one of the clinical features of COPD, leading disease progression and increase mortality of patients [4]. It is needed to assess and monitor exercise tolerance effectively. The 6-minute walk test (6MWT) is a reliable and widely used measure of exercise capacity [5]. It has been difficult to popularize in primary medical institutions due to need for suitable venue and professional training. It is important to establish a screening method that is highly accurate, simple, and can be performed in medical facility
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