Ablating adenovirus type 5 fiber-CAR binding and HI loop insertion of the SIGYPLP peptide generate an endothelial cell-selective adenovirus

Nicklin, S., Von Seggern, D., Work, L., Pek, D., Dominiczak, A., Nemerow, G. and Baker, A. (2001) Ablating adenovirus type 5 fiber-CAR binding and HI loop insertion of the SIGYPLP peptide generate an endothelial cell-selective adenovirus. Molecular Therapy, 4(6), pp. 534-542. (doi: 10.1006/mthe.2001.0489)

Abstract

Adenovirus type 5 (Ad) based vectors transduce vascular endothelial cells (EC) and have been widely used for vascular gene transfer. However, many cell types express the Ad receptor (cox-sackievirus adenovirus receptor; CAR), preventing selective EC infection and precluding clinical use. We previously isolated the human EC-binding peptides SIGYPLP and LSNFHSS by phage display and demonstrated by means of a bispecific antibody that SIGYPLP directs efficient, high-level, EC-selective Ad-mediated gene transfer. We now generate genetically modified Ad fiber proteins with selective EC tropism by engineering these peptides into the HI loop of the Ad fiber. SIGYPLP, but not LSNFHSS, enhanced EC selectivity, demonstrating maintenance of peptide–cell binding fidelity upon incorporation into virions. Combining fiber mutations that block CAR binding (detargeting) with SIGYPLP insertion (retargeting) generated a novel Ad vector, AdKO1SIG, in a single component system. AdKO1SIG demonstrated efficient and selective tropism for EC compared with control Ad vectors. This is the first demonstration of genetic incorporation of a novel, mammalian, cell-selective ligand that retains its targeting fidelity in the Ad fiber HI loop, in combination with point mutations that abolish fiber–CAR interaction. This study demonstrates the potential for improving the cell-selectivity and safety of adenoviral vectors.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Dominiczak, Professor Anna and Nicklin, Professor Stuart and Baker, Professor Andrew and Work, Dr Lorraine
• Authors: Nicklin, S., Von Seggern, D., Work, L., Pek, D., Dominiczak, A., Nemerow, G., and Baker, A.
• College/School: College of Medical Veterinary and Life Sciences; College of Medical Veterinary and Life Sciences > School of Cardiovascular & Metabolic Health
• Journal Name: Molecular Therapy
• Publisher: Nature Publishing Group
• ISSN: 1525-0016
• ISSN (Online): 1525-0024