Association between metabolic dysfunction-associated steatotic liver disease and pulmonary function: a...

Area of Science:

• Hepatology
• Pulmonology
• Genetics

Background:

• Hepatic steatosis is linked to respiratory diseases, but the causal relationship with metabolic dysfunction-associated steatotic liver disease (MASLD) is debated.
• Previous studies suggest a connection, but robust evidence establishing causality is lacking.

Purpose of the Study:

• To investigate the causal association between MASLD and pulmonary function using a large national cohort.
• To employ Mendelian randomization (MR) to assess the etiological link between MASLD and respiratory health.

Main Methods:

• Utilized data from 30,442 participants in the National Health and Nutrition Examination Survey (2007-2012).
• Collected demographics, pulmonary function indices (FEV1, FVC), and liver fat score (LFS) data.
• Performed two-sample MR analysis using GWAS data for MASLD, FEV1/FVC, COPD, and asthma.

Main Results:

• No significant differences in FEV1, FVC, or FEV1/FVC ratio were observed between participants with and without MASLD.
• MR analysis indicated no causal correlation between MASLD and FEV1/FVC, COPD, or asthma.
• Reverse MR analyses also showed no significant causal relationships.

Conclusions:

• This study provides strong evidence against a causal association between MASLD and impaired pulmonary function.
• The findings suggest that MASLD is unlikely to be a direct cause of respiratory diseases such as COPD or asthma.