title: CD70-CD27 ligation between neural stem cells and CD4+ T cells induces Fas-FasL-mediated T-cell death.
abstract: BACKGROUND
  Neural stem cells (NSCs) are among the most promising candidates for cell replacement therapy in neuronal injury and neurodegenerative diseases. One of the remaining obstacles for NSC therapy is to overcome the alloimmune response on NSCs by the host.
  
  
  METHODS
  To investigate the mechanisms of immune modulatory function derived from the interaction of human NSCs with allogeneic T cells, we examined the immune regulatory effects of human NSCs on allogeneic T cells in vitro.
  
  
  RESULTS
  Significantly, NSCs induced apoptosis of allogeneic T cells, in particular CD4+ T cells. Interaction of CD70 on NSCs and CD27 on CD4(+) T cells mediated apoptosis of T cells. Thus, blocking CD70-CD27 interaction prevented NSC-mediated death of CD4(+) T cells.
  
  
  CONCLUSIONS
  We present a rational explanation of NSC-induced immune escape in two consecutive stages. First, CD70 constitutively expressed on NSCs engaged CD27 on CD4(+) T cells, which induced Fas ligand expression on CD4(+) T cells. Second, CD4(+) T-cell apoptosis was followed by Fas-Fas ligand interaction in the CD4(+) T cells.
authors.forename: Eun Mi
authors.initials: EM
authors.lastname: Lee
authors.forename: Sunghoon
authors.initials: S
authors.lastname: Hurh
authors.forename: Bumrae
authors.initials: B
authors.lastname: Cho
authors.forename: Kook-Hwan
authors.initials: KH
authors.lastname: Oh
authors.forename: Seung U
authors.initials: SU
authors.lastname: Kim
authors.forename: Charles D
authors.initials: CD
authors.lastname: Surh
authors.forename: Jonathan
authors.initials: J
authors.lastname: Sprent
authors.forename: Jaeseok
authors.initials: J
authors.lastname: Yang
authors.forename: Jae Young
authors.initials: JY
authors.lastname: Kim
authors.forename: Curie
authors.initials: C
authors.lastname: Ahn
mesh_terms: D000328:Adult; D000911:Antibodies, Monoclonal / Q000276:immunology; D017209:Apoptosis; D053282:CD27 Ligand / Q000276:immunology / Q000378:metabolism*; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology* / Q000378:metabolism; D002460:Cell Line; D018920:Coculture Techniques; D053222:Fas Ligand Protein / Q000378:metabolism*; D005260:Female; D015234:HLA-A Antigens / Q000235:genetics / Q000378:metabolism; D015235:HLA-B Antigens / Q000235:genetics / Q000378:metabolism; D006684:HLA-DR Antigens / Q000235:genetics / Q000378:metabolism; D006801:Humans; D008297:Male; D058953:Neural Stem Cells / Q000166:cytology / Q000378:metabolism; D018127:Tumor Necrosis Factor Receptor Superfamily, Member 7 / Q000276:immunology / Q000378:metabolism*; D015854:Up-Regulation; D055815:Young Adult; D019014:fas Receptor / Q000378:metabolism*
chemical_list: D000911:Antibodies, Monoclonal; D053282:CD27 Ligand; D053222:Fas Ligand Protein; D015234:HLA-A Antigens; D015235:HLA-B Antigens; D006684:HLA-DR Antigens; D018127:Tumor Necrosis Factor Receptor Superfamily, Member 7; D019014:fas Receptor