Causal Association Between Circulating Inflammatory Proteins and Autoimmune Liver Disease: a Bidirectional Two-Sample...

Area of Science:

• Immunology
• Genetics
• Hepatology

Background:

• Autoimmune liver diseases (AILD) encompass conditions like autoimmune hepatitis (AIH), primary biliary cholangitis (PBC), and primary sclerosing cholangitis (PSC).
• The precise etiological factors driving AILD remain incompletely understood, highlighting the need for novel insights into disease mechanisms.
• Identifying specific biomarkers and causal pathways is crucial for advancing AILD diagnosis and treatment strategies.

Purpose of the Study:

• To investigate potential causal relationships between circulating inflammatory proteins and the risk of developing autoimmune liver disease (AILD).
• To explore whether specific inflammatory proteins could serve as diagnostic indicators or therapeutic targets for AILD.
• To leverage genetic data and advanced statistical methods to elucidate these associations.

Main Methods:

• Utilized Genome-Wide Association Studies (GWAS) data for 91 inflammation-associated proteins.
• Performed bidirectional two-sample Mendelian randomization (MR) analysis, employing inverse variance weighted (IVW) as the primary method.
• Supplemented primary analysis with MR Egger, weighted median, and weighted mode methods, alongside sensitivity analyses to ensure robustness.

Main Results:

• Identified associations between specific inflammatory proteins and increased risk for different AILD subtypes.
• CDCP1 and IL-18 were linked to higher autoimmune hepatitis (AIH) risk.
• CXCL11 showed association with increased primary biliary cholangitis (PBC) risk, while other proteins were linked to increased primary sclerosing cholangitis (PSC) risk.
• Reverse MR indicated potential bidirectional relationships, with PBC influencing CCL4 and OSM expression, and PSC influencing several inflammatory proteins.

Conclusions:

• The study suggests a significant potential association between circulating inflammatory proteins and the pathogenesis of AILD.
• These findings may pave the way for novel diagnostic biomarkers and therapeutic targets in AILD management.
• Further research is warranted to validate these associations and explore their clinical utility in preventing and treating AILD.