title: Adoptive transfer of pTRP2-specific CTLs expanding by bead-based artificial antigen-presenting cells mediates anti-melanoma response.
abstract: Cytotoxic CD8(+) T cells are key effectors in the immunotherapy of malignant and viral diseases. However, the lack of efficient methods for their in vitro priming and expansion has become a bottleneck to the development of vaccines and adoptive transfer strategies. Synthetic artificial antigen-presenting cells (aAPCs) are now emerging as an attractive tool for eliciting and expanding CTL responses. This study reported a novel approach for targeting malignant melanoma with pTRP2-specific cytotoxic T lymphocytes (CTLs) expanded from the C57BL/6 splenocytes by multiple stimulations with aAPCs made by coating H-2K(b)-Ig/pTRP2 dimeric complexes, anti-CD28 antibody, 4-1BBL molecules and CD83 molecules to cell-sized latex beads. The induced CTLs exhibited specific lysis against RMA-S cells pulsed with the peptide pTRP2 and H-2K(b+) melanoma cells expressing TRP2, while a murine Lewis lung carcinoma cell line 3LL could not be recognized by the CTLs. The peptide-specific activity was inhibited by anti-H-2K(b) monoclonal antibody Y3. Adoptive Transfer of CTLs specific for malignant melanoma expanding by the aAPCs can mediate effective anti-melanoma response. These results suggested the bead-based aAPCs coated with an MHC-Ig/peptide complex, anti-CD28 antibody, 4-1BBL and CD83 could provide a useful tool for the reproducible expansion of specific CTLs for adoptive immunotherapy.
authors.affiliation: Advanced Biomaterials and Tissue Engineering Center, Huazhong University of Science and Technology, Wuhan, China.
authors.forename: Xiaoling
authors.initials: X
authors.lastname: Lu
authors.forename: Xiaobing
authors.initials: X
authors.lastname: Jiang
authors.forename: Ruen
authors.initials: R
authors.lastname: Liu
authors.forename: Hongyang
authors.initials: H
authors.lastname: Zhao
authors.forename: Zhihui
authors.initials: Z
authors.lastname: Liang
mesh_terms: D019264:Adoptive Transfer; D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology; D000938:Antigen-Presenting Cells / Q000276:immunology*; D018920:Coculture Techniques; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D019746:Intramolecular Oxidoreductases / Q000276:immunology*; D008545:Melanoma / Q000628:therapy*; D051379:Mice; D008810:Mice, Inbred C57BL; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D019746:Intramolecular Oxidoreductases; C042501:dopachrome isomerase