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Protein A carrying PMMA microbeads: adsorption of cholesterol and HlgG from human plasma
1Chemical Engineering Department, Hacettepe University, Beytepe, Ankara, Turkey.
Abstract:
Cholesterol and HIgG adsorbed from human plasma obtained from a hypercholesterolemic patient, onto protein A-immobilized polymethyl-methacrylate uniform microbeads carrying different amounts of protein A (0.264-1.682 mg protein A/g PMMA, or 0.66-4.2 mg protein A/m2 PMMA) were investigated in batchwise experiments. There was no interaction between protein A molecules and cholesterol when cholesterol aqueous solutions were used. However, there was significant cholesterol and HIgG adsorption from the plasma obtained from a patient with hypercholesterolemia. The maximum amounts of cholesterol and HIgG adsorbed were 3.96 micromol cholesterol/g PMMA (5.4 mg cholesterol/g PMMA) and 0.242 micromol IgG/g PMMA (35.4 mg IgG/g PMMA).
Insights
Protein A microbeads effectively adsorb cholesterol and IgG from hypercholesterolemia patient plasma. This indicates potential for selective removal of these substances from blood.
Area of Science:
- Biomaterials Science
- Analytical Chemistry
- Biochemistry
Background:
- Hypercholesterolemia is a condition characterized by high cholesterol levels.
- Protein A is a surface protein found on Staphylococcus aureus, known for its ability to bind immunoglobulins.
- Polymethyl-methacrylate (PMMA) microbeads are versatile materials used in various biomedical applications.
Purpose of the Study:
- To investigate the adsorption of cholesterol and immunoglobulin G (IgG) from human plasma onto protein A-immobilized PMMA microbeads.
- To determine the effect of varying protein A surface density on adsorption capacity.
- To assess the specificity of protein A-cholesterol interaction.
Main Methods:
- Batchwise adsorption experiments were conducted using protein A-coated PMMA microbeads.
- Microbeads were functionalized with different amounts of protein A.
- Adsorption was studied using plasma from a hypercholesterolemic patient and cholesterol aqueous solutions.
Main Results:
- No significant adsorption of cholesterol was observed when using cholesterol aqueous solutions, indicating no direct interaction with protein A.
- Significant adsorption of both cholesterol and IgG occurred when using plasma from a hypercholesterolemic patient.
- Maximum adsorption capacities reached 3.96 micromol cholesterol/g PMMA and 0.242 micromol IgG/g PMMA.
Conclusions:
- Protein A-immobilized PMMA microbeads demonstrate selective adsorption of cholesterol and IgG from hypercholesterolemic plasma.
- The findings suggest potential applications in the therapeutic apheresis for managing hypercholesterolemia.
- Further research is warranted to optimize the material for clinical use.