title: Involvement of interaction between Fractalkine and CX3CR1 in cytotoxicity of natural killer cells against tumor cells.
abstract: Many chemokine receptors are typically found on natural killer cells, including CX3CR1, the receptor for the chemokine fractalkine (FKN). This study explored whether interaction between CX3CR1 and FKN is relevant for NK cell functions in cytotoxicity against tumors. FKN expression was examined by polymerase chain reaction and CX3CR1 expression in NK cells was analyzed by flow cytometry. NK cell cytotoxicity was examined by 4-h 51Cr-release assay. FKN was expressed in a variety of tumor cell lines such as K562 cells, an NK-sensitive cell line. Approximately 90% of peripheral blood NK cells and almost all of the NK cell line, NK-92 cells, expressed CX3CR1. Anti-CX3CR1 antibody strongly neutralized the cytotoxicity of NK cells against K562 cells, and pretreatment of NK cells with recombinant soluble FKN improved the cytolytic function on tumor cells. This study demonstrates that an interaction between CX3CR1 on NK cells and FKN on tumor cells is involved in the natural cytotoxicity of NK cells against tumors.
authors.affiliation: Hefei National Laboratory for Physical Sciences at Microscale and School of Life Sciences, University of Science and Technology of China, Hefei 230027, P.R. China.
authors.forename: Xiaojun
authors.initials: X
authors.lastname: Zhang
authors.forename: Haiming
authors.initials: H
authors.lastname: Wei
authors.forename: Hui
authors.initials: H
authors.lastname: Wang
authors.forename: Zhigang
authors.initials: Z
authors.lastname: Tian
mesh_terms: D000073883:CX3C Chemokine Receptor 1; D045744:Cell Line, Tumor; D054428:Chemokine CX3CL1; D020523:Chemokines, CX3C / Q000276:immunology / Q000378:metabolism*; D003602:Cytotoxicity, Immunologic; D005434:Flow Cytometry; D006801:Humans; D007694:Killer Cells, Natural / Q000276:immunology*; D008565:Membrane Proteins / Q000276:immunology / Q000378:metabolism*; D009369:Neoplasms / Q000276:immunology*; D019707:Receptors, Chemokine / Q000276:immunology / Q000378:metabolism*; D020133:Reverse Transcriptase Polymerase Chain Reaction
chemical_list: D000073883:CX3C Chemokine Receptor 1; C515538:CX3CL1 protein, human; C095235:CX3CR1 protein, human; D054428:Chemokine CX3CL1; D020523:Chemokines, CX3C; D008565:Membrane Proteins; D019707:Receptors, Chemokine