Polyinosinic Acid Blocks Adeno-Associated Virus Macrophage Endocytosis In Vitro and Enhances Adeno-Associated Virus Liver-Directed Gene Therapy In Vivovan Dijk, R., Montenegro-Miranda, P. S., Riviere, C., Schilderink, R., ten Bloemendaal, L., van Gorp, J., Duijst, S., de Waart, D. R., Beuers, U., Haisma, H. J. & Bosma, P. J., 1-Sep-2013, In : Human Gene Therapy. 24, 9, p. 807-813 7 p.
Research output: Contribution to journal › Article › Academic › peer-review
Adeno-associated virus serotype 8 (AAV8) has been demonstrated to be effective for liver-directed gene therapy in humans. Although hepatocytes are the main target cell for AAV8, there is a loss of the viral vector because of uptake by macrophages and Kupffer cells. Reducing this loss would increase the efficacy of viral gene therapy and allow a dose reduction. The receptor mediating this uptake has not been identified; a potential candidate seems the macrophage scavenger receptor A (SR-A) that is involved in the endocytosis of, for instance, adenovirus. In this study we show that SR-A can mediate scAAV8 endocytosis and that blocking it with polyinosinic acid (poly[i]) reduces endocytosis significantly in vitro. Subsequently, we demonstrate that blocking this receptor improves scAAV-mediated liver-directed gene therapy in a model for inherited hyperbilirubinemia, the uridine diphospho-glucuronyl transferase 1A1-deficient Gunn rat. In male rats, preadministration of poly[i] increases the efficacy of a low dose (1x10(11) gc/kg) but not of a higher dose (3x10(11) gc/kg) scAAV8-LP1-UT1A1. Administration of poly[i] just before the vector significantly increases the correction of serum bilirubin in female rats. In these, the effect of poly[i] is seen by both doses but is more pronounced in the females receiving the low vector, where it also results in a significant increase of bilirubin glucuronides in bile. In conclusion, this study shows that SR-A mediates the endocytosis of AAV8 in vitro and in vivo and that blocking this receptor can improve the efficacy of AAV-mediated liver-directed gene therapy.
|Number of pages||7|
|Journal||Human Gene Therapy|
|Publication status||Published - 1-Sep-2013|
- CRIGLER-NAJJAR-SYNDROME, BILIRUBIN-UDP-GLUCURONOSYLTRANSFERASE, INNATE IMMUNE-RESPONSES, SCAVENGER RECEPTORS, ADENOVIRUS VECTORS, VIRAL VECTORS, CELLS, ACTIVATION, TRANSPLANTATION, IDENTIFICATION