title: Soluble recombinant CMVpp65 spanning multiple HLA alleles for reconstitution of antiviral CD4+ and CD8+ T-cell responses after allogeneic stem cell transplantation.
abstract: The reactivation of the human cytomegalovirus (CMV) can be prevented or controlled by the adoptive transfer of ex vivo expanded donor-derived CMV-specific T lymphocytes. Several methods for expansion and adoptive transfer of CMV-specific T cells have been developed using either defined CMV peptides or peptide pools for antigen-specific T-cell stimulation. The majority of studies have focused on the lower matrix protein (pp65) and the immediate-early protein-1 (IE-1) of CMV as immunodominant targets. We investigated the behavior of secretory CMVpp65 (sCMVpp65) with respect to its capacity to stimulate pp65-specific T cells independently of human lymphocyte antigen (HLA) type and even in donors unresponsive to the immunodominant HLA-A*0201-restricted CMVpp65495-503 peptide. To facilitate the eukaryotic expression and isolation procedures, we constructed an HLA-A*0201/CMVpp65 fusion protein that is secreted into the supernatant of human embryonic kidney 293 (HEK293) cells. CMV-specific CD4 and CD8 T cells generated by culturing unfractionated peripheral blood mononuclear cells in the presence of recombinant sCMVpp65 did not differ in function with regard to cytotoxicity and interferon-gamma (IFN-gamma) production compared with cytotoxic T cells induced using the well-studied HLA-A*0201-restricted CMVpp65495-503 peptide. We demonstrated that polyclonal CMV-specific T cells could be generated from CMV-seropositive individuals expressing HLA alleles for which no immunogenic epitopes have been identified so far. The production of recombinant sCMVpp65 can easily be adapted to good manufacturing practice conditions and can be used to generate large numbers of immunogenic pathogen-derived proteins for therapeutic applications.
authors: Institute for Transfusion Medicine, Hannover Medical School, D-30625 Hannover, Germany.
authors: Ananta
authors: A
authors: Paine
authors: Mathias
authors: M
authors: Oelke
authors: Sabine
authors: S
authors: Tischer
authors: Hans-Gert
authors: HG
authors: Heuft
authors: Rainer
authors: R
authors: Blasczyk
authors: Britta
authors: B
authors: Eiz-Vesper
mesh_terms: D019264:Adoptive Transfer / Q000379:methods; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology*; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology*; D003587:Cytomegalovirus / Q000276:immunology; D003586:Cytomegalovirus Infections / Q000209:etiology / Q000517:prevention & control; D004797:Enzyme-Linked Immunosorbent Assay; D006680:HLA Antigens / Q000276:immunology*; D006801:Humans; D008213:Lymphocyte Activation / Q000276:immunology; D010750:Phosphoproteins / Q000276:immunology*; D011993:Recombinant Fusion Proteins / Q000138:chemical synthesis* / Q000276:immunology; D020133:Reverse Transcriptase Polymerase Chain Reaction; D033581:Stem Cell Transplantation / Q000009:adverse effects*; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology; D014184:Transplantation, Homologous; D014763:Viral Matrix Proteins / Q000276:immunology*
chemical_list: D006680:HLA Antigens; D010750:Phosphoproteins; D011993:Recombinant Fusion Proteins; D014763:Viral Matrix Proteins; C065418:cytomegalovirus matrix protein 65kDa