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The Journal of Immunology, Vol 143, Issue 9 2990-2995, Copyright © 1989 by American Association of Immunologists

ARTICLES

Anaphylactoid reactions mediated by autoantibodies to cholesterol in miniature pigs

NM Wassef, SH Johnson, GM Graeber, GM Swartz Jr, CL Schultz, JR Hailey, AJ Johnson, DG Taylor, RL Ridgway and CR Alving
Department of Membrane Biochemistry, Walter Reed Army Institute of Research, Washington, DC 20307-5100.

Antoantibodies to cholesterol were detected and purified from normal (nonimmunized) pig serum. The antibodies were assayed by ELISA with crystalline cholesterol as an Ag and by C-dependent damage to cholesterol-laden liposomes. Intravenous injection of liposomes containing cholesterol into anesthetized animals caused decreased hemolytic complement titers, and induced a reaction consisting of transient neutropenia, thrombocytopenia, respiratory distress, cyanosis, pulmonary and systemic hypertension, and decreased cardiac output. Plasma levels of thromboxane B2 and 6-keto-prostaglandin F1 alpha increased 1300 and 200%, respectively, and leukocyte and platelet counts decreased by 36 and 38%, respectively. Injection of cholesterol- free liposomes did not induce the reaction. These results show that naturally occurring autoantibodies to cholesterol can initiate C activation and can be associated with anaphylactoid reaction to exogenously administered cholesterol in pigs.


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