Use of structural alterations in the synthesis of halothane metabolite antigens to mimic halothane-induced immunogen.
Four hapten-carrier conjugates were synthesized to evaluate any potential antigenic similarities between these synthetic compounds and the immunogens induced in vivo by the anesthetic, halothane and, thus, be used eventually as a more sensitive probe to detect the presence of these halothane-induced antibodies in halothane-exposed individuals. In this study, antibodies from five halothane hepatitis patients were used to evaluate these antigenic alterations since the specificity of these antibodies would most accurately reflect the antigenic structure of halothane-induced immunogens. Quantitation of antibody binding to these synthetic proteins was determined in an enzyme linked immunosorbent assay and immunoblot techniques. Trifluoroacetylated rabbit serum albumin was 5 times more reactive with these antibodies and thus more antigenic than the homologous acetylated moiety confirming the importance of the trifluoromethyl moiety as an epitope in the immunogen in vivo. Insertion of a spacer arm, aminocaproic acid, between the hapten and carrier moieties and an epitope density of 40% acetylation also increased antigenicity. Through these structural alterations produced in vitro, antigenic compounds have been produced which may resemble more closely the immunogen elicited in vivo and which may ultimately serve as more sensitive probes for halothane-induced antibodies from exposed individuals.
Department of Anesthesiology, University of Arizona, Tucson 85724.
A K
AK
Hubbard
J P
JP
Levy
T P
TP
Roth
A J
AJ
Gandolfi
D000085:Acetates / Q000138:chemical synthesis / Q000276:immunology; D000107:Acetylation; D000614:Aminocaproates / Q000138:chemical synthesis* / Q000737:chemistry / Q000276:immunology; D000818:Animals; D000906:Antibodies / Q000276:immunology; D056486:Chemical and Drug Induced Liver Injury / Q000276:immunology; D000939:Epitopes / Q000276:immunology; D005260:Female; D005461:Fluorine / Q000276:immunology; D005463:Fluoroacetates; D006221:Halothane / Q000009:adverse effects / Q000276:immunology* / Q000378:metabolism; D006241:Haptens / Q000276:immunology; D006801:Humans; D015151:Immunoblotting; D011817:Rabbits; D012709:Serum Albumin / Q000138:chemical synthesis* / Q000737:chemistry / Q000276:immunology; D014269:Trifluoroacetic Acid / Q000138:chemical synthesis / Q000737:chemistry / Q000276:immunology; D014614:Vaccines, Synthetic / Q000276:immunology
D000085:Acetates; D000614:Aminocaproates; D000906:Antibodies; D000939:Epitopes; D005463:Fluoroacetates; D006241:Haptens; D012709:Serum Albumin; D014614:Vaccines, Synthetic; C053344:trifluoroacetyl-serum albumin; C067041:trifluoroacetylaminocaproic acid serum albumin; D005461:Fluorine; D014269:Trifluoroacetic Acid; D006221:Halothane