Thromb Haemost 1999; 81(02): 240-244
DOI: 10.1055/s-0037-1614450
Review Articles
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Inhibitor Antibody Development and T Cell Response to Human Factor VIII in Murine Hemophilia A

Jiahua Qian
1   From the Holland Laboratory, American Red Cross, Rockville, MD, Department of Medicine, George Washington University School of Medicine and Health Sciences, Washington, DC, and the Department of Genetics, University of Pennsylvania School of Medicine, Philadelphia, PA, USA
,
Marina Borovok
1   From the Holland Laboratory, American Red Cross, Rockville, MD, Department of Medicine, George Washington University School of Medicine and Health Sciences, Washington, DC, and the Department of Genetics, University of Pennsylvania School of Medicine, Philadelphia, PA, USA
,
Lei Bi
1   From the Holland Laboratory, American Red Cross, Rockville, MD, Department of Medicine, George Washington University School of Medicine and Health Sciences, Washington, DC, and the Department of Genetics, University of Pennsylvania School of Medicine, Philadelphia, PA, USA
,
Haig H. Kazazian Jr.
1   From the Holland Laboratory, American Red Cross, Rockville, MD, Department of Medicine, George Washington University School of Medicine and Health Sciences, Washington, DC, and the Department of Genetics, University of Pennsylvania School of Medicine, Philadelphia, PA, USA
,
Leon W. Hoyer
1   From the Holland Laboratory, American Red Cross, Rockville, MD, Department of Medicine, George Washington University School of Medicine and Health Sciences, Washington, DC, and the Department of Genetics, University of Pennsylvania School of Medicine, Philadelphia, PA, USA
› Author Affiliations
Further Information

Publication History

Received18 May 1998

Accepted after resubmission22 October 1998

Publication Date:
08 December 2017 (online)

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Summary

In order to understand better the mechanism of inhibitor formation in hemophilia A patients, we have characterized the immune response to human factor VIII in a murine model of hemophilia A. Mice with severe factor VIII deficiency caused by targeted gene disruptions in exons 16 and 17 were injected intravenously with human factor VIII. Anti-factor VIII was absent or was detected at only very low levels in hemophilic mice of both strains after a single injection of 0.2 μg factor VIII, but it was present in most mice after a second exposure. Subsequent exposures led to high titer anti-factor VIII antibodies in both ELISA and inhibitor assays. A human factor VIII-specific T cell proliferative response was detected with spleen cells obtained three days after a single injection with human factor VIII, before mice had detectable anti-factor VIII antibodies. Subsequent exposures to factor VIII were followed by an increased T cell proliferative response. These studies indicate that murine hemophilia A is a good model for the study of the immune response to human factor VIII, especially the role of the T cell in the early steps in inhibitor antibody formation.