title: Recombinant herpes simplex virus type 1 engineered for targeted binding to erythropoietin receptor-bearing cells.
abstract: The utility of recombinant herpes simplex virus type 1 (HSV-1) vectors may be expanded by manipulation of the virus envelope to achieve cell-specific gene delivery. To this end, an HSV-1 mutant virus deleted for glycoprotein C (gC) and the heparan sulfate binding domain of gB (KgBpK-gC-) was engineered to encode different chimeric proteins composed of N-terminally truncated forms of gC and the full-length erythropoietin hormone (EPO). Biochemical analyses demonstrated that one gC-EPO chimeric molecule (gCEPO2) was posttranslationally processed, incorporated into recombinant HSV-1 virus (KgBpK-gCEPO2), and neutralized with antibodies directed against gC or EPO in a complement-dependent manner. Moreover, KgBpK-gCEPO2 recombinant virus was specifically retained on a soluble EPO receptor column, was neutralized by soluble EPO receptor, and stimulated proliferation of FD-EPO cells, an EPO growth-dependent cell line. FD-EPO cells were nevertheless refractory to productive infection by both wild-type HSV-1 and recombinant KgBpK-gCEPO2 virus. Transmission electron microscopy of FD-EPO cells infected with KgBpK-gCEPO2 showed virus endocytosis leading to aborted infection. Despite the lack of productive infection, these data provide the first evidence of targeted HSV-1 binding to a non-HSV-1 cell surface receptor.
authors.affiliation: Departments of Molecular Genetics and Biochemistry, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15261, USA.
authors.forename: S
authors.initials: S
authors.lastname: Laquerre
authors.forename: D B
authors.initials: DB
authors.lastname: Anderson
authors.forename: D B
authors.initials: DB
authors.lastname: Stolz
authors.forename: J C
authors.initials: JC
authors.lastname: Glorioso
mesh_terms: D000818:Animals; D001665:Binding Sites; D002460:Cell Line; D002462:Cell Membrane / Q000378:metabolism; D002522:Chlorocebus aethiops; D004921:Erythropoietin / Q000235:genetics / Q000378:metabolism; D017353:Gene Deletion; D015870:Gene Expression; D005818:Genetic Engineering; D005822:Genetic Vectors; D018259:Herpesvirus 1, Human / Q000235:genetics* / Q000378:metabolism* / Q000648:ultrastructure; D051379:Mice; D008854:Microscopy, Electron; D011499:Protein Processing, Post-Translational; D017467:Receptors, Erythropoietin / Q000378:metabolism*; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D011995:Recombination, Genetic; D014162:Transfection; D014709:Vero Cells; D014759:Viral Envelope Proteins / Q000235:genetics / Q000378:metabolism
chemical_list: D017467:Receptors, Erythropoietin; D011993:Recombinant Fusion Proteins; D014759:Viral Envelope Proteins; C038535:glycoprotein gC, herpes simplex virus type 1; D004921:Erythropoietin