title: Poly(hydroxyethyl methacrylate) based affinity membranes for in vitro removal of anti-dsDNA antibodies from SLE plasma.
abstract: The preparation of polymeric membrane using affinity technology for application in blood filtration devices is described here. DNA attached poly(hydroxyethyl methacrylate) (PHEMA) based microporous affinity membrane was prepared for selective removal of anti-dsDNA antibodies from systemic lupus erythematosus (SLE) patient plasma in in vitro. In order to further increase blood-compatibility of affinity membrane, aminoacid based comonomer N-methacryloyl-L-alanine (MAAL) was included in the polymerization recipe. PHEMAAL membrane was produced by a photopolymerization technique and then characterized by swelling tests and scanning electron microscope (SEM) studies. Blood-compatibility tests were also performed. The water swelling ratio of PHEMAAL membrane increased significantly (133.2%) compared with PHEMA (58%). PHEMAAL membrane has large pores around in the range of 5-10 microm. All the clotting times increased when compared with PHEMA membrane. Loss of platelets and leukocytes was very low. DNA loading was 7.8 mg/g. There was a very low anti-dsDNA-antibody adsorption onto the plain PHEMAAL membrane, about 78 IU/g. The PHEMAAL-DNA membrane adsorbed anti-dsDNA-antibody in the range of 10-68 x 10(3)IU/g from SLE plasma. Anti-dsDNA-antibody concentration decreased significantly from 875 to 144 IU/ml with the time. Anti-dsDNA-antibodies could be repeatedly adsorbed and eluted without noticeable loss in the anti-dsDNA-antibody adsorption amount.
authors.affiliation: Department of Chemistry, Biochemistry Division, Hacettepe University, Ankara, Turkey.
authors.forename: Lokman
authors.initials: L
authors.lastname: Uzun
authors.forename: Handan
authors.initials: H
authors.lastname: Yavuz
authors.forename: Bilgen
authors.initials: B
authors.lastname: Osman
authors.forename: Hamdi
authors.initials: H
authors.lastname: Celik
authors.forename: Adil
authors.initials: A
authors.lastname: Denizli
mesh_terms: D000327:Adsorption; D000974:Antibodies, Antinuclear / Q000097:blood / Q000737:chemistry / Q000302:isolation & purification*; D001777:Blood Coagulation; D005260:Female; D006801:Humans; D008180:Lupus Erythematosus, Systemic / Q000097:blood*; D008297:Male; D008422:Materials Testing; D008567:Membranes, Artificial; D010949:Plasma / Q000737:chemistry; D011102:Polyhydroxyethyl Methacrylate / Q000737:chemistry*; D016062:Porosity
chemical_list: D000974:Antibodies, Antinuclear; D008567:Membranes, Artificial; D011102:Polyhydroxyethyl Methacrylate