title: Immunoblotting human C4 bound to human erythrocytes in vivo and in vitro.
abstract: A study of C4 bound to human erythrocytes in vitro and in vivo has been made by immunoblotting with mouse monoclonal anti-C4c and anti-C4d and human polyclonal anti-C4d (Rodgers and Chido) following SDS-PAGE. Multi-banded patterns differentiated between C4A and C4B isotypes. Treatment of EC4b with trypsin eliminated immunoblotting but not agglutination reactions. Serum inactivation (factor I) of EC4b resulted in banding patterns similar to those obtained from patients' EC4d. Treatment of EC4b membranes with NH2OH affected many of the bands, two were lost, one was markedly reduced and others had altered SDS-PAGE mobility. Interpretation of the bands has been made in terms of C4-acceptor complexes and inactivation fragments of C4. A distinct difference in the banding of C4A and C4B isotypes has been detected.
authors.affiliation: Department of Medicine, Royal Postgraduate Medical School, Hammersmith Hospital, London, England.
authors.forename: C M
authors.initials: CM
authors.lastname: Giles
authors.forename: T
authors.initials: T
authors.lastname: Robson
mesh_terms: D064753:Ammonium Hydroxide; D015153:Blotting, Western; D002738:Chloroquine / Q000494:pharmacology; D002918:Chymotrypsin / Q000494:pharmacology; D003181:Complement C4 / Q000032:analysis*; D015934:Complement C4a / Q000187:drug effects; D015935:Complement C4b / Q000187:drug effects; D004229:Dithiothreitol / Q000494:pharmacology; D004591:Electrophoresis, Polyacrylamide Gel; D004912:Erythrocytes / Q000276:immunology*; D006386:Hemagglutination Tests; D006801:Humans; D006878:Hydroxides / Q000494:pharmacology; D019811:Hydroxylamine; D006898:Hydroxylamines / Q000494:pharmacology; D011869:Radioligand Assay; D014357:Trypsin / Q000494:pharmacology; D000338:beta-Aminoethyl Isothiourea / Q000494:pharmacology
chemical_list: D003181:Complement C4; D006878:Hydroxides; D006898:Hydroxylamines; D000338:beta-Aminoethyl Isothiourea; D019811:Hydroxylamine; D064753:Ammonium Hydroxide; D015934:Complement C4a; D015935:Complement C4b; D002738:Chloroquine; D002918:Chymotrypsin; D014357:Trypsin; D004229:Dithiothreitol