Inflammatory profiling of peripheral arterial disease.

Area of Science:

• Cardiovascular Medicine
• Immunology
• Inflammation Research

Background:

• Peripheral arterial disease (PAD) progression is poorly understood, with potential links to inflammatory dysfunction.
• Inflammatory mediators and autoantibodies may play a role in PAD pathogenesis.

Purpose of the Study:

• To investigate the role of specific interleukins (ILs) and autoantibodies in PAD.
• To characterize the inflammatory response in PAD patients in vitro.
• To correlate inflammatory markers with disease severity.

Main Methods:

• Profiling of IL-1beta, IL-2, IL-4, IL-6, IL-8, IL-10, IL-13, anticardiolipin, and anti-beta2-glycoprotein 1 antibody concentrations.
• Classification of patients (critical ischemics, stable claudicants, controls) based on WHO criteria and ankle-brachial pressure index.
• In vitro whole blood culture with lipopolysaccharide to assess cytokine production.
• Measurement of autoantibodies via ELISA and cytokine profiles via multiplex immunoassay.

Main Results:

• Higher serum levels of IL-6, IL-10, IL-13, and anti-beta2-glycoprotein 1 antibody were observed in PAD patients.
• IL-6 and anti-beta2-glycoprotein 1 antibody levels positively correlated with PAD disease severity.
• In vitro, PAD whole blood showed higher IL-8 and IL-13 secretion, but this normalized when standardized for leukocyte count, suggesting leukocytosis as a factor.

Conclusions:

• PAD is characterized by an increased inflammatory burden, more pronounced with greater disease severity.
• The heightened in vitro inflammatory response in PAD patients appears linked to leukocytosis, not an intrinsic cellular dysfunction.
• Further research into the inflammatory mechanisms in PAD is warranted.