Abstract:
: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.
journal_name
Semin Thromb Hemostjournal_title
Seminars in thrombosis and hemostasisauthors
Van Damme A,Chuah MK,Collen D,VandenDriessche Tdoi
10.1055/s-2004-825632subject
Has Abstractpub_date
2004-04-01 00:00:00pages
185-95issue
2eissn
0094-6176issn
1098-9064journal_volume
30pub_type
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