| First Author | Ragni MV | Year | 2009 |
| Journal | Exp Hematol | Volume | 37 |
| Issue | 6 | Pages | 744-54 |
| PubMed ID | 19463774 | Mgi Jnum | J:151239 |
| Mgi Id | MGI:4353448 | Doi | 10.1016/j.exphem.2009.02.011 |
| Citation | Ragni MV, et al. (2009) Factor VIII-pulsed dendritic cells reduce anti-factor VIII antibody formation in the hemophilia A mouse model. Exp Hematol 37(6):744-54 |
| abstractText | OBJECTIVE: Hemophilia inhibitor formation is a T-cell-dependent immune response to infused factor VIII (F.VIII). As immature dendritic cells (DCre) regulate immune response and promote tolerance, we evaluated F.VIII-pulsed DCre, propagated from bone marrow in the presence of granulocyte-macrophage colony-stimulating factor and transforming growth factor-beta, in achieving F.VIII tolerance. MATERIALS AND METHODS: The effects of intravenous F.VIII-pulsed DCre in C57BL/6 hemophilia A mice were determined by total F.VIII inhibitory antibodies, T-cell proliferation, thymidine uptake, cytokine profile, and surface molecule expression. RESULTS: After tail vein injection of 2.5 U recombinant F.VIII (rF.VIII) on day 0, 2, and 4, anti-F.VIII antibody peaked on day 6, and increased further on day 17 following rF.VIII rechallenge on day 12, 14, and 16, with increased T-cell proliferative response to in vitro F.VIII. When mice were pretreated with 2 x 10(6) F.VIII-pulsed immature DCre (deficient nuclear factor-kappaB nuclear protein binding, low CD80, low CD86, high interleukin [IL]-10 phenotype) 7 days before rF.VIII challenge, anti-F.VIII was reduced on day 6 and on day 8, 0.1 +/- 0.0 (Bethesda units/mL) vs control phosphate-buffered saline-treated hemophilia A mice, 2.0 +/- 0.1 Bethesda units/mL, p < 0.01. Rechallenge with rF.VIII on day 12 produced no increase in anti-F.VIII antibody response. This was associated with high serum IL-10 and low IL-2 levels by enzyme-linked immunosorbent assay, and splenic T-cell hyporesponsiveness to F.VIII, with IL-10 production, high FoxP3 expression by quantitative polymerase chain reaction, and T regulatory cell expansion, confirmed in ovalbumin-T-cell receptor transgenic mice. CONCLUSIONS: These findings suggest F.VIII-pulsed DCre reduce anti-F.VIII antibody formation in hemophilia A mice by induction of regulatory T-cell-mediated hyporesponsiveness of T-helper cells to F.VIII. |
