A causal relationship between circulating immune cells, plasma metabolites, and pulmonary diseases: a mediated Mendelian randomization study.

Background: Immune cells and plasma metabolites may play important roles in the development of pulmonary diseases, but the relationship between different immune cells, plasma metabolites and various pulmonary diseases is still unclear. In this study, we aim to employ Mendelian randomization (MR) to investigate the causality between immune cells, pulmonary diseases and plasma metabolites.

Methods: We analyzed immune cells and seven pulmonary diseases, including interstitial lung disease (ILD), idiopathic pulmonary fibrosis (IPF), lung cancer, pneumonia, chronic obstructive pulmonary disease (COPD), sleep apnea syndrome (SAS), and tuberculosis (TB), using genome-wide association analysis (GWAS) data for immune cells as an exposure factor and seven lung diseases as outcomes.

Epigenetic silenced miR-125a-5p could be self-activated through targeting Suv39H1 in gastric cancer.

Emerging evidence suggests that microRNAs (miRNAs) serve an important role in tumorigenesis and development. Although the low expression of miR-125a-5p in gastric cancer has been reported, the underlying mechanism remains unknown. In the current study, the low expression of miR-125a-5p in gastric cancer was verified in paired cancer tissues and adjacent non-tumour tissues.