Different inflammatory responses induced by three LDL-lowering apheresis columns

Area of Science:

• Cardiovascular Medicine
• Immunology
• Biochemistry

Background:

• Low-density lipoprotein (LDL) apheresis is crucial for managing uncontrolled hypercholesterolemia.
• LDL apheresis impacts biomarkers related to atherosclerosis and acute coronary syndromes.
• Understanding the inflammatory response to different apheresis devices is critical.

Purpose of the Study:

• To systematically compare the inflammatory response induced by three distinct LDL apheresis columns.
• To evaluate the impact of whole blood adsorption, plasma adsorption, and plasma filtration on inflammatory biomarkers.
• To assess differences in complement activation and cytokine profiles among apheresis methods.

Main Methods:

• Cross-over study involving three patients with heterozygous familial hypercholesterolemia.
• Six consecutive treatments using three LDL apheresis columns: DL-75, LA-15, and EC-50W.
• Measurement of biochemical parameters and 27 inflammatory biomarkers (cytokines, chemokines, complement products) pre- and post-treatment.

Main Results:

• All devices significantly reduced LDL cholesterol equally.
• Complement activation (alternative pathway) and sC5b-9 increase were similar across devices.
• Adsorption columns resulted in lower C3a and C5a levels and generally less pronounced cytokine changes compared to filtration.
• High-sensitivity C-reactive protein (Hs-CRP) reduction varied significantly by device.

Conclusions:

• Despite equivalent LDL-lowering efficacy, the three LDL apheresis devices elicit distinct inflammatory responses.
• Adsorption-based apheresis columns appear to induce a less pronounced inflammatory reaction than plasma filtration.
• These findings highlight the importance of device selection based on inflammatory profiles in LDL apheresis therapy.