Abstract
The binding of a component of human complement (C1q) to membrane-bound specific anti-nitroxide antibodies was studied as a function of the physical properties (fluid vs. solid) of vesicle lipids. The antibodies were bound to spin-label lipid haptens in the vesicle membrane. The binding of C1q to the sensitized vesicles shows a maximum as a function of specific IgG concentration. The binding of antibodies and of C1q to the vesicle membrane does not depend strongly on the physical state of the membrane lipids. even at low hapten (0.05 mol%) concentrations. These results are of significance for the understanding of the previously reported effect of lipid physical states on complement depletion.
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Selected References
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- Assimeh S. N., Bing D. H., Painter R. H. A simple method for the isolation of the subcomponents of the first component of complement by affinity chromatography. J Immunol. 1974 Jul;113(1):225–234. [PubMed] [Google Scholar]
- Bartholomew R. M., Esser A. F. The first complement component: evidence for an equilibrium between C1s free in serum and C1s bound in the C1 complex. J Immunol. 1977 Dec;119(6):1916–1922. [PubMed] [Google Scholar]
- Brûlet P., McConnell H. M. Lateral hapten mobility and immunochemistry of model membranes. Proc Natl Acad Sci U S A. 1976 Sep;73(9):2977–2981. doi: 10.1073/pnas.73.9.2977. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Brûlet P., McConnell H. M. Structural and dynamical aspects of membrane immunochemistry using model membranes. Biochemistry. 1977 Mar 22;16(6):1209–1217. doi: 10.1021/bi00625a028. [DOI] [PubMed] [Google Scholar]
- Cohen S. The requirement for the association of two adjacent rabbit gamma-G-antibody molecules in the fixation of complement by immune complexes. J Immunol. 1968 Feb;100(2):407–413. [PubMed] [Google Scholar]
- Deamer D., Bangham A. D. Large volume liposomes by an ether vaporization method. Biochim Biophys Acta. 1976 Sep 7;443(3):629–634. doi: 10.1016/0005-2736(76)90483-1. [DOI] [PubMed] [Google Scholar]
- Hughes-Jones N. C. Functional affinity constants of the reaction between 125I-labelled C1q and C1q binders and their use in the measurement of plasma C1q concentrations. Immunology. 1977 Feb;32(2):191–198. [PMC free article] [PubMed] [Google Scholar]
- Humphires G. M., McConnell H. M. Antigen mobility in membranes and complement-medical immune attack. Proc Natl Acad Sci U S A. 1975 Jul;72(7):2483–2487. doi: 10.1073/pnas.72.7.2483. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Humphries G. M., McConnell H. M. Membrane-controlled depletion of complement activity by spin-label-specific IgM. Proc Natl Acad Sci U S A. 1977 Aug;74(8):3537–3541. doi: 10.1073/pnas.74.8.3537. [DOI] [PMC free article] [PubMed] [Google Scholar]
- McClare C. W. An accurate and convenient organic phosphorus assay. Anal Biochem. 1971 Feb;39(2):527–530. doi: 10.1016/0003-2697(71)90443-x. [DOI] [PubMed] [Google Scholar]
- Müller-Eberhard H. J. Complement. Annu Rev Biochem. 1975;44:697–724. doi: 10.1146/annurev.bi.44.070175.003405. [DOI] [PubMed] [Google Scholar]
- Pecht I., Ehrenberg B., Calef E., Arnon R. Conformational changes and complement activation induced upon antigen binding to antibodies. Biochem Biophys Res Commun. 1977 Feb 21;74(4):1302–1310. doi: 10.1016/0006-291x(77)90584-8. [DOI] [PubMed] [Google Scholar]
- Reid K. B., Lowe D. M., Porter R. R. Isolation and characterization of C1q, a subcomponent of the first component of complement, from human and rabbit sera. Biochem J. 1972 Dec;130(3):749–763. doi: 10.1042/bj1300749. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Sledge C. R., Bing D. H. Binding properties of the human complement protein Clq. J Biol Chem. 1973 Apr 25;248(8):2818–2823. [PubMed] [Google Scholar]
- Yonemasu K., Stroud R. M. Clq: rapid purification method for preparation of monospecific antisera and for biochemical studies. J Immunol. 1971 Feb;106(2):304–313. [PubMed] [Google Scholar]
- Yonemasu K., Stroud R. M., Niedermeier W., Butler W. T. Chemical studies of Clq; a modulator of immunoglobulin biology. Biochem Biophys Res Commun. 1971 Jun 18;43(6):1388–1394. doi: 10.1016/s0006-291x(71)80028-1. [DOI] [PubMed] [Google Scholar]