Semin Thromb Hemost 2004; 30(2): 215-226
DOI: 10.1055/s-2004-825635
Copyright © 2004 by Thieme Medical Publishers, Inc., 333 Seventh Avenue, New York, NY 10001, USA.

Immune Implications of Gene Therapy for Hemophilia

Roland W. Herzog1 , 2 , Eric Dobrzynski2
  • 1Assistant Professor of Pediatrics, Department of Pediatrics, University of Pennsylvania Medical Center and The Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania
  • 2Department of Pediatrics, University of Pennsylvania Medical Center and The Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania
Further Information

Publication History

Publication Date:
07 May 2004 (online)

Preview

Similar to any novel treatment strategy for hemophilia, gene therapy faces the question of the risk of formation of inhibitory antibodies to the therapeutic factor VIII or factor IX protein. Activation of CD4+ or CD8+ T cells could lead to antibody formation or cytotoxic T lymphocyte responses to transgene-expressing cells. Preclinical studies in animal models of hemophilia A and B with different mutations in the dysfunctional gene shed light on the risk for such immune responses and point toward strategies to avoid immune activation or even promote tolerance induction. The impacts of variables such as choice and design of gene transfer vector, underlying gene mutation, route of vector administration, and transient immune suppression are discussed. Maintenance of immunological hyporesponsiveness to the therapeutic gene product is critical for successful gene therapy. Recent studies provide evidence for tolerance induction to coagulation factor antigens by viral hepatic or neonatal in vivo gene transfer, by in utero gene delivery, and by oral or nasal administration of protein or peptides.

REFERENCES

Roland W HerzogPh.D. 

The Children’s Hospital of Philadelphia, Abramson Research Center 302

34th St. and Civic Center Blvd.

Philadelphia, PA 19104

Email: rwherzog@mail.med.upenn.edu