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Thromb Haemost 1987; 57(03): 314-321
DOI: 10.1055/s-0038-1651124
Original Article
Schattauer GmbH Stuttgart

The Development and Characterisation of Antibodies to Human Factor VIII in Haemophilic Dogs

Janet D Littlewood
*   The Department of Clinical Veterinary Medicine, University of Cambridge, London, UK
,
T W Barrowcliffe
+   The National Institute for Biological Standards and Control, London, UK
› Author Affiliations
Further Information

Publication History

Received 02 December 1986

Accepted after revision 23 February 1987

Publication Date:
06 July 2018 (online)

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Summary

Four haemophilic dogs received infusions of human factor VIII concentrates, and developed inhibitors to human F VIII. These inhibitors cross-reacted with canine F VIII with parallel increases and decreases in titre. Cross-reaction was also found to porcine F VIII but changes in titre did not correlate with anti-human and anti-canine titres. These inhibitors were found to be immunoglobulins, and antibodies were detected against other proteins found in concentrates. Kinetic studies showed that in all four dogs the F VIII inhibitors were Type II antibodies. One of the dogs behaved as a “high-responder”, whilst another was more analogous to a “low-responder” patient. Phospholipid protection experiments in vitro demonstrated that some antibodies could be prevented from inhibiting F VIII, and porcine F VIII was particularly well protected against inhibition.

Keywords

Haemophilia A - Dogs - Factor VIII concentrates - Phospholipids - Factor VIII inhibitors - Factor VIII antibodies
 

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