title: Targeting lentiviral vectors to antigen-specific immunoglobulins.
abstract: Gene transfer into B cells by lentivectors can provide an alternative approach to managing B lymphocyte malignancies and autoreactive B cell-mediated autoimmune diseases. These pathogenic B cell populations can be distinguished by their surface expression of monospecific immunoglobulin. Development of a novel vector system to deliver genes to these specific B cells could improve the safety and efficacy of gene therapy. We have developed an efficient method to target lentivectors to monospecific immunoglobulin-expressing cells in vitro and in vivo. We were able to incorporate a model antigen CD20 and a fusogenic protein derived from the Sindbis virus as two distinct molecules into the lentiviral surface. This engineered vector could specifically bind to cells expressing surface immunoglobulin recognizing CD20 (alphaCD20), resulting in efficient transduction of target cells in a cognate antigen-dependent manner in vitro, and in vivo in a xenografted tumor model. Tumor suppression was observed in vivo, using the engineered lentivector to deliver a suicide gene to a xenografted tumor expressing alphaCD20. These results show the feasibility of engineering lentivectors to target immunoglobulin- specific cells to deliver a therapeutic effect. Such targeting lentivectors also could potentially be used to genetically mark antigen-specific B cells in vivo to study their B cell biology.
authors.affiliation: Mork Family Department of Chemical Engineering and Material Science, University of Southern California, Los Angeles, CA 90089, USA.
authors.forename: Leslie
authors.initials: L
authors.lastname: Ziegler
authors.forename: Lili
authors.initials: L
authors.lastname: Yang
authors.forename: Kye il
authors.initials: Ki
authors.lastname: Joo
authors.forename: Haiguang
authors.initials: H
authors.lastname: Yang
authors.forename: David
authors.initials: D
authors.lastname: Baltimore
authors.forename: Pin
authors.initials: P
authors.lastname: Wang
mesh_terms: D000818:Animals; D000941:Antigens / Q000235:genetics*; D018951:Antigens, CD20 / Q000235:genetics; D001402:B-Lymphocytes / Q000276:immunology; D002460:Cell Line; D005818:Genetic Engineering; D015316:Genetic Therapy / Q000379:methods; D005822:Genetic Vectors; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007136:Immunoglobulins / Q000235:genetics*; D066298:In Vitro Techniques; D016086:Lentivirus / Q000235:genetics*; D051379:Mice; D016688:Mice, Inbred NOD; D016513:Mice, SCID; D011947:Receptors, Antigen, B-Cell / Q000235:genetics; D012845:Sindbis Virus / Q000235:genetics; D014161:Transduction, Genetic; D014760:Viral Fusion Proteins / Q000235:genetics
chemical_list: D000941:Antigens; D018951:Antigens, CD20; D007136:Immunoglobulins; D011947:Receptors, Antigen, B-Cell; D014760:Viral Fusion Proteins