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Preparation and comparative properties of antisera against glyco-3 beta,12 alpha-dihydroxy-5-cholen-24-oic acid linked to bovine serum albumin at the C-3, C-15 alpha, and C-24 positions.

Anti glyco-3 beta,12 alpha-dihydroxy-5-cholen-24-oic acid antisera were prepared by immunizing rabbits with hapten-bovine serum albumin (BSA) conjugates coupled at the C-3, C-15 alpha, and C-24 positions on the bile acid molecule, and their properties were investigated by heterologous combination assay using 125I-labeled tracer. The antiserum raised against the C-3 BSA conjugate showed poor titer and specificity, while the antisera from the other two conjugates showed satisfactorily high affinity constants (Ka = 5.0 x 10(8) and 7.0 x 10(8) M-1) and reasonable specificity, exhibiting negligible cross-reactivities with other major human bile acids and cholesterol. Among the unsaturated bile acids tested, high reactivity was observed with tauro-3 beta,12 alpha-dihydroxy-5-cholen-24-oic acid, which suggested that bridge phenomena were significant in this assay system.