title: In vitro differentiation of adult bone marrow progenitors into antigen-specific CD4 helper T cells using engineered stromal cells expressing a notch ligand and a major histocompatibility complex class II protein.
abstract: A murine stromal cell line (OP9-DL1) expressing a notch ligand, Delta-like-1, has been shown to be able to drive the differentiation of both murine and human hematopoietic progenitors into T cells in vitro. Further studies showed that hematopoietic progenitors transduced by a retroviral vector to express a human CD8 T-cell receptor (TCR) followed by an OP9-DL1 monolayer coculture could generate antigen-specific cytotoxic T lymphocytes in vitro. It remains unknown if a similar method could be applied to produce CD4 helper T cells. In this report, we show that murine adult bone marrow (BM) cells transduced with an OT2 CD4 TCR and cocultured with OP9 stromal cells expressing Delta-like-1 can differentiate into antigen-specific CD4 T cells in vitro. These cells are capable of inducing the expression of T-cell activation markers and producing cytokines upon stimulation. We have also constructed a new stromal cell line (OP9-DL1-IA(b)) ectopically expressing a murine major histocompatibility complex class II protein, I-A(b), in OP9-DL1 cells. This new line could accelerate the development of TCR-transduced BM cells into CD4 T cells, resulting in cells with an improved capacity to respond to T-cell stimulation to secrete cytokines. Taken together, we demonstrate a general and potentially useful method to generate autologous antigen-specific CD4 helper T cells in vitro from easily accessible BM cells.
authors.affiliation: Mork Family Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, California 90089, USA.
authors.forename: Bingbing
authors.initials: B
authors.lastname: Dai
authors.forename: Pin
authors.initials: P
authors.lastname: Wang
mesh_terms: D000818:Animals; D001854:Bone Marrow Cells / Q000166:cytology*; D018929:Cell Culture Techniques / Q000379:methods*; D002454:Cell Differentiation; D018920:Coculture Techniques; D000939:Epitopes / Q000276:immunology; D005260:Female; D000949:Histocompatibility Antigens Class II / Q000276:immunology*; D008024:Ligands; D051379:Mice; D008810:Mice, Inbred C57BL; D011948:Receptors, Antigen, T-Cell / Q000276:immunology; D051880:Receptors, Notch / Q000378:metabolism; D013234:Stem Cells / Q000166:cytology*; D017154:Stromal Cells / Q000166:cytology*; D006377:T-Lymphocytes, Helper-Inducer / Q000166:cytology*; D014161:Transduction, Genetic
chemical_list: D000939:Epitopes; D000949:Histocompatibility Antigens Class II; D008024:Ligands; D011948:Receptors, Antigen, T-Cell; D051880:Receptors, Notch