title: Artificial antigen-presenting cells transduced with telomerase efficiently expand epitope-specific, human leukocyte antigen-restricted cytotoxic T cells.
abstract: Human telomerase reverse transcriptase (hTERT) is overexpressed in most human tumors, making it a potential target for cancer immunotherapy. hTERT-derived CTL epitopes have been identified previously, including p865 (RLVDDFLLV) and p540 (ILAKFLHWL), which are restricted by the human leukocyte antigen (HLA) class I A*0201 allele. However, it remains a major challenge to efficiently and consistently expand hTERT-specific CTLs from donor peripheral blood T lymphocytes. To bypass the need for generating conventional antigen-presenting cells (APC) on an autologous basis, we investigated the potential ability of fibroblast-derived artificial APCs (AAPC) to activate and expand HLA-A*0201-restricted CTLs. We show here that AAPCs stably expressing HLA-A*0201, human beta(2)-microglobulin, B7.1, intercellular adhesion molecule-1, and LFA-3, together with either p540 and p865 minigenes or the full-length hTERT, effectively stimulate tumoricidal, hTERT-specific CTLs. hTERT-expressing AAPCs stimulated both p540 and p865 CTLs as shown by peptide-specific cytolysis and tetramer staining, indicating that hTERT is processed by the AAPCs and that the two peptides are presented as codominant epitopes. The level of cytotoxic activity against a panel of tumors comprising hematologic and epithelial malignancies varied, correlating overall with the level of HLA-A2 and hTERT expression by the target cell. Starting from 100 mL blood, approximately 100 million hTERT-specific CTLs could be generated over the course of five sequential stimulations, representing an expansion of approximately 1 x 10(5). Our data show that AAPCs process hTERT antigen and efficiently stimulate hTERT-specific CTLs from human peripheral blood T lymphocytes and suggest that sufficient expansion could be achieved to be clinically useful for adoptive cell therapy.
authors.affiliation: Department of Medicine, Memorial Sloan-Kettering Cancer Center and the Joan and Sanford Weill Medical College of Cornell University and Immunology Program, Sloan-Kettering Institute, New York, New York 10021, USA. gynbreast@mskcc.org
authors.forename: Jakob
authors.initials: J
authors.lastname: Dupont
authors.forename: Jean-Baptiste
authors.initials: JB
authors.lastname: Latouche
authors.forename: Chia
authors.initials: C
authors.lastname: Ma
authors.forename: Michel
authors.initials: M
authors.lastname: Sadelain
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000938:Antigen-Presenting Cells / Q000276:immunology*; D045744:Cell Line, Tumor; D004268:DNA-Binding Proteins; D018984:Epitopes, T-Lymphocyte / Q000096:biosynthesis / Q000235:genetics / Q000276:immunology*; D015234:HLA-A Antigens / Q000235:genetics / Q000276:immunology; D015789:HLA-A2 Antigen; D006801:Humans; D016219:Immunotherapy, Adoptive / Q000379:methods*; D020014:K562 Cells; D008213:Lymphocyte Activation; D051379:Mice; D008969:Molecular Sequence Data; D010446:Peptide Fragments / Q000235:genetics / Q000276:immunology; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology*; D019098:Telomerase / Q000235:genetics / Q000276:immunology* / Q000378:metabolism; D014161:Transduction, Genetic; D014162:Transfection
chemical_list: D004268:DNA-Binding Proteins; D018984:Epitopes, T-Lymphocyte; D015234:HLA-A Antigens; C435939:HLA-A*02:01 antigen; D015789:HLA-A2 Antigen; D010446:Peptide Fragments; D019098:Telomerase