Dextran-sulfate cellulose adsorption for lowering Lp[a]

Area of Science:

• Cardiovascular Medicine
• Biochemistry
• Medical Technology

Background:

• Familial hypercholesterolemia (FH) is a genetic disorder leading to high cholesterol.
• Patients with FH often require advanced therapies when diet and drugs are insufficient.
• Lipoproteins, including LDL and Lp[a], are key targets in managing hypercholesterolemia.

Purpose of the Study:

• To evaluate the efficacy of the Liposorber LA-15 system for LDL apheresis in FH patients.
• To assess the selective removal of low-density lipoprotein (LDL) and lipoprotein(a) (Lp[a]).
• To analyze the rebound kinetics of LDL and Lp[a] after apheresis treatment.

Main Methods:

• Dextran sulfate immobilized on cellulose was used in the Liposorber LA-15 system.
• A nine-center controlled study included patients with heterozygous and homozygous FH.
• Patients underwent repetitive LDL apheresis sessions.

Main Results:

• The system demonstrated highly efficient and specific removal of LDL and Lp[a] (>90% of theoretical).
• Plasma LDL and Lp[a] concentrations were significantly reduced during treatment.
• LDL and Lp[a] levels returned to baseline within 3-4 weeks after the cessation of apheresis.

Conclusions:

• Repetitive LDL apheresis using the Liposorber LA-15 system is effective in lowering LDL and Lp[a] in FH patients.
• LDL rebound kinetics can be modeled by a simple one-pool system.
• Lp[a] rebound kinetics suggest a more complex model involving extravascular pools.