Semin Thromb Hemost 2004; 30(2): 185-195
DOI: 10.1055/s-2004-825632
Copyright © 2004 by Thieme Medical Publishers, Inc., 333 Seventh Avenue, New York, NY 10001, USA.

Onco-Retroviral and Lentiviral Vector-Based Gene Therapy for Hemophilia: Preclinical Studies

An Van Damme1 , 2 , Marinee K.L Chuah2 , Désiré Collen2 , Thierry VandenDriessche2
  • 1Professor, Center for Transgene Technology and Gene Therapy, University of Leuven, Flanders Interuniversity Institute for Biotechnology (VIB), University Hospital Gasthuisberg, Leuven, Belgium
  • 2Center for Transgene Technology and Gene Therapy, University of Leuven, Flanders Interuniversity Institute for Biotechnology (VIB), University Hospital Gasthuisberg, Leuven, Belgium
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Publication History

Publication Date:
07 May 2004 (online)

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Hemophilia A and B gene therapy requires long-term and stable expression of coagulation factor VIII (FVIII) or factor IX (FIX), respectively, and would need to compare favorably with protein replacement therapy. Onco-retroviral and lentiviral vectors are attractive vectors for gene therapy of hemophilia. These vectors have the potential for long-term expression because they integrate stably in the target cell genome. Whereas onco-retroviral vectors can only transduce dividing cells, lentiviral vectors can transduce a broad variety of cell types irrespective of cell division. Several preclinical and clinical studies have explored the use of onco-retroviral and, more recently, lentiviral vectors for gene therapy of hemophilia A or B. Both ex vivo and in vivo gene therapy approaches have been evaluated, resulting in therapeutic FVIII or FIX levels in preclinical animal models. Whereas in vivo gene therapy using onco-retroviral or lentiviral vectors often led to long-term FVIII or FIX expression from transduced hepatocytes, ex vivo approaches were generally hampered by either low or transient expression of FVIII or FIX levels in vivo and/or inefficient engraftment. Furthermore, immune responses against the transgene product remain a major issue that must be resolved before the full potential of these vectors eventually can be exploited clinically. Nevertheless, the continued progress in vector design combined with a better understanding of vector biology may ultimately yield more effective gene therapy approaches using these integrating vectors.

REFERENCES

Thierry VandenDriesschePh.D. 

Center for Transgene Technology and Gene Therapy, University of Leuven, Flanders Interuniversity Institute for Biotechnology (VIB), University Hospital Gasthuisberg

Herestraat 49, B-3000 Leuven, Belgium

Email: thierry.vandendriessche@med.kuleuven.ac.be