title: Immune responses to polyethylene glycol modified L-asparaginase in mice.
abstract: Suppression of anti-L-asparaginase (anti-A-ase) IgG and IgE antibody responses was achieved in Balb/c mice with polyethylene glycol (PEG, MW, 5,000) conjugated Escherichia coli A-ase. Following the administration of the mixture of A-ase and PEG-A-ase, antibody production to A-ase was reduced. PEG-A-ase administration prior to A-ase suppressed the primary and secondary responses to A-ase antibody. The suppression could be transferred to normal mice with spleen cells from A-ase tolerant mice. The cell transfer experiment showed that the suppression was caused by suppressor T cells. Since PEG-A-ase administration failed to suppress antibody response to ovalbumin, the suppression seemed to be A-ase specific. PEG-A-ase administration also suppressed the delayed type hypersensitivity reaction. IgG and IgE antibodies to PEG or PEG-A-ase were not detected in mice immunized with PEG or PEG-A-ase in the presence of Freund's complete adjuvant or A1(OH)3, respectively.
mesh_terms: D000818:Animals; D000917:Antibody Formation; D000918:Antibody Specificity; D001215:Asparaginase / Q000276:immunology*; D005260:Female; D007116:Immunization, Passive; D007117:Immunization, Secondary; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D011092:Polyethylene Glycols / Q000276:immunology*; D051381:Rats; D011919:Rats, Inbred Strains
chemical_list: D011092:Polyethylene Glycols; D001215:Asparaginase