Hemophilia A (HA) is an X-linked bleeding disease caused by factor VIII (FVIII) deficiency. We previously demonstrated that FVIII is produced specifically in liver sinusoid endothelial cells (LSECs) and to some degree in myeloid cells, and thus, in the present work, we seek to restrict the expression of FVIII transgene to these cells using cell-specific promoters. With this approach, we aim to limit immune response in a mouse model by lentiviral vector (LV)-mediated gene therapy encoding FVIII. To increase the target specificity of FVIII expression, we included miRNA target sequences (miRTs) (i.e., miRT-142.3p, miRT-126, and miRT-122) to silence expression in hematopoietic cells, endothelial cells, and hepatocytes, respectively. Notably, we report, for the first time, therapeutic levels of FVIII transgene expression at its natural site of production, which occurred without the formation of neutralizing antibodies (inhibitors). Moreover, inhibitors were eradicated in FVIII pre-immune mice through a regulatory T cell-dependent mechanism. In conclusion, targeting FVIII expression to LSECs and myeloid cells by using LVs with cell-specific promoter minimized off-target expression and immune responses. Therefore, at least for some transgenes, expression at the physiologic site of synthesis can enhance efficacy and safety, resulting in long-term correction of genetic diseases such as HA.
A Novel Platform for Immune Tolerance Induction in Hemophilia A Mice / S. Merlin, E.S. Cannizzo, E. Borroni, V. Bruscaggin, P. Schinco, W. Tulalamba, M.K. Chuah, V.R. Arruda, T. Vandendriessche, M. Prat, G. Valente, A. Follenzi. - In: MOLECULAR THERAPY. - ISSN 1525-0016. - 25:8(2017 Aug 02), pp. 1815-1830.
|Titolo:||A Novel Platform for Immune Tolerance Induction in Hemophilia A Mice|
CANNIZZO, ELVIRA STEFANIA (Secondo)
|Parole Chiave:||gene therapy; hemophilia A; inhibitor titers reversion; targeted FVIII expression; Tregs; Animals; CD11b Antigen; Disease Models, Animal; Endothelial Cells; Factor VIII; Gene Expression; Genes, Reporter; Genetic Vectors; Hemophilia A; Immune Tolerance; Immunization; Isoantibodies; Lentivirus; Male; Mice; Mice, 129 Strain; Mice, Inbred BALB C; Mice, Inbred C57BL; Organ Specificity; Promoter Regions, Genetic; T-Lymphocytes, Regulatory; Transduction, Genetic; Transgenes; Whole Blood Coagulation Time; Immunosuppression; Molecular Medicine; Molecular Biology; Genetics; Pharmacology; Drug Discovery3003 Pharmaceutical Science|
|Settore Scientifico Disciplinare:||Settore BIO/17 - Istologia|
|Data di pubblicazione:||2-ago-2017|
|Data ahead of print / Data di stampa:||2017|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1016/j.ymthe.2017.04.029|
|Appare nelle tipologie:||01 - Articolo su periodico|