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DOI: 10.1055/s-0038-1651887
Studies on the Neutralization of Rabbit Antibodies to Human Factor VIII
Publication History
Received
19 April 1977
Accepted
20 May 1977
Publication Date:
04 July 2018 (online)
Summary
The capacity of normal and haemophilic cryoprecipitates to neutralize the anticoagulant effect of rabbit antibodies to human factor VIII (anti-VIII) was assessed using a quantitative estimation of antibody. About 4 times as much anti-VIII could be neutralized by normal factor VIII as was required to neutralize clotting activity. This suggests that there are probably several antigenic sites intimately associated with factor VIII clotting activity, quite apart from any antigenic sites which may be detected using antibodies directed against other components of the factor VIII complex. The neutralizing capacity of factor VIII was only slightly greater for the rabbit antibodies employed in this study than has been previously reported for antibodies of human origin, thus indicating only minor differences in specificities. Additional evidence in support of this concept was the finding that cryoprecipitates prepared from haemophilic plasmas previously recognized as either lacking or possessing the capacity to neutralize antibodies of human origin neutralized least or most quantities of rabbit antibodies, respectively.
* Present address: Department of Medicine, College of Physicians and Surgeons of Columbia University, 630 West 168th St., New York, N. Y. 10032, U.S.A.
** Clinical Research Center, Watford Road, Harrow, Middlesex HAI 3UJ, England.
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