NDLI: Immunochemical Properties of Anti-Galα1–3Gal Antibodies After Sensitization with Xenogeneic Tissues

Content Provider	Springer Nature Link
Author	Yu, Paul B. Parker, William Everett, Mary Lou Fox, Ira J. Platt, Jeffrey L.
Copyright Year	1999
Abstract	In antigen-driven immune responses to proteins, antibodies of low avidity and limited complement fixing capacity undergo affinity maturation to yield antibodies of higher avidity which fix complement to a greater extent. The products of antigen-driven responses to carbohydrates are less defined. To investigate the evolution of natural antibodies against carbohydrates following sensitization, we studied natural antibodies specific for Galα1-3Gal in patients sensitized to that antigen as a result of perfusion of their blood through porcine livers for the treatment of hepatic failure. The natural antibodies against Galα1-3Gal, which occur in all unsensitized individuals, were predominantly IgM and IgG2, with average functional avidities of 5 × 10$^{−9}$ and 2 × 10$^{−8}$ M, respectively. After sensitization, the classes of anti-Galα1-3Gal included IgM, IgG2, and IgG1, and the average functional avidities of IgM and IgG were 3 × 10$^{−9}$ and 2 × 10$^{−9}$ M, respectively. The activation of complement by anti-Galα1-3Gal per microgram of Ab, measured by the fixation of C3bi on porcine cells, increased after sensitization owing to changes in subclass and avidity. Deposition of C3bi correlated with the concentrations of IgG1 and IgM but not IgG2 against Galα1-3Gal. Consistent with this finding, purified IgG1, but not IgG2, anti-Galα1-3Gal fixed complement on porcine cells. These results demonstrate that the properties of anticarbohydrate antibodies evolve after sensitization to increase complement fixation on potential targets. These properties may result from the altered costimulation of the humoral response to Galα1-3Gal due to sensitization.
Starting Page	116
Ending Page	126
Page Count	11
File Format	PDF
ISSN	02719142
Journal	Journal of Clinical Immunology
Volume Number	19
Issue Number	2
e-ISSN	15732592
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	1999-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Immunology Medical Microbiology Internal Medicine Infectious Diseases
Content Type	Text
Resource Type	Article
Subject	Immunology and Allergy Immunology

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