Innate immune response gene expression profiles characterize primary antiphospholipid syndrome

Area of Science:

• Immunology
• Genetics
• Autoimmune Diseases

Background:

• Primary antiphospholipid syndrome (PAPS) is a systemic autoimmune disorder with significant clinical impact.
• PAPS is characterized by blood clots and pregnancy complications.
• Understanding PAPS pathogenesis is crucial for clinical management.

Purpose of the Study:

• To investigate gene expression profiles in peripheral blood mononuclear cells (PBMCs) from PAPS patients.
• To identify molecular pathways involved in the pathogenesis of PAPS.
• To explore potential therapeutic targets for PAPS.

Main Methods:

• Microarray analysis of gene expression in PBMCs from PAPS patients.
• In vitro stimulation of PBMCs with lipopolysaccharide (LPS).
• Analysis of gene expression related to innate immunity and transcriptional control.

Main Results:

• Significantly increased expression of innate immune response genes (e.g., toll-like receptor 8, CD14) and downstream effectors (STAT1, OAS2, TNFSF13, PLSCR1) in PAPS patients.
• Elevated expression of monocyte-specific cytokines in LPS-stimulated PAPS PBMCs, indicating a 'response to pathogen' signature.
• Reduced expression of genes involved in transcriptional control, with potential involvement of deregulated RB/E2F activity.

Conclusions:

• PAPS pathogenesis may involve an altered monocyte response to pathogens.
• Gene expression alterations suggest a role for deregulated RB/E2F activity in PAPS.
• These findings provide insights into the molecular mechanisms underlying PAPS.