title: MHC class II alpha/beta heterodimeric cell surface molecules expressed from a single proviral genome.
abstract: Transplantation tolerance to renal allografts can be induced in large animal preclinical models if the donor and recipient have identical major histocompatibility complex (MHC) class II loci. Such class II matching is, however, not clinically achievable owing to the extreme diversity of class II sequences. With the ultimate goal of creating a somatic class II match in the bone marrow of an allograft recipient, the aim of the study is to develop a double-copy retrovirus construct to express both chains of the MHC class II DQ glycoprotein on a single transduced cell. Analysis of the expression patterns of the retroviral DQ transgenes in both virus producer and transduced fibroblasts revealed correct transcription and stable surface expression of the DQ heterodimers. In addition, we demonstrate that both the DQA and DQB sequences are functional within the same proviral copy, a prerequisite for efficient induction of transplantation tolerance following transduction of bone marrow precursor cells. The DQ double-copy retrovirus vector showed efficient expression of the transferred class II cDNA in murine colony-forming units for the granulocyte-monocyte lineage (CFU-GM), indicating that it is suitable for gene therapy of multimeric proteins in hematopoietic cells.
authors.affiliation: Transplantation Biology Research Center, Massachusetts General Hospital/Harvard Medical School, Boston 02129, USA.
authors.forename: H
authors.initials: H
authors.lastname: Shimada
authors.forename: S
authors.initials: S
authors.lastname: Germana
authors.forename: K C
authors.initials: KC
authors.lastname: Sonntag
authors.forename: P
authors.initials: P
authors.lastname: Banerjee
authors.forename: D
authors.initials: D
authors.lastname: Moore
authors.forename: D H
authors.initials: DH
authors.lastname: Sachs
authors.forename: C
authors.initials: C
authors.lastname: LeGuern
mesh_terms: D016475:3T3 Cells; D000818:Animals; D015152:Blotting, Northern; D015139:Blotting, Southern; D005434:Flow Cytometry; D015870:Gene Expression; D018014:Gene Transfer Techniques; D005802:Genes, MHC Class II; D005822:Genetic Vectors / Q000235:genetics; D006683:HLA-DQ Antigens / Q000096:biosynthesis* / Q000235:genetics; D051379:Mice; D011533:Proviruses / Q000235:genetics; D012190:Retroviridae / Q000235:genetics; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013552:Swine
chemical_list: D006683:HLA-DQ Antigens