title: CD27/CD70 interaction directly induces natural killer cell killing activity.
abstract: The CD27 molecule is expressed on a portion of natural killer (NK) cells as well as T and B cells. To provide the functional capacity of CD27 molecule on NK cells, we here highly purified CD3- CD56+ NK cells by flow cytometry (purity > 98%), and investigated their NK cell activity via CD27/CD70 interaction using a CD70-transfectant by a 4 h 51Cr-release assay. The enhancement of NK activity by purified NK cells in the presence of interleukin-2 (IL-2) or interleukin-12 (IL-12) against CD70/Nalm-6 was not recognized as compared to against mock/Nalm-6. However, after a coculture with the fixed CD70/300-19, the purified NK cells increased the NK cell activity against K562, the value being 10 to 20% higher than coculture with the mock/300-19 in the presence of IL-2 or IL-12. The enhancement of NK activity was blocked by the addition of anti-CD70 monoclonal antibody (mAb). In addition, conjugation of NK cells to the target was increased by coculture with the CD70/300-19 without increased expression of adhesion molecules. In the parallel experiment, there was no increase in the killing capacity of NK cells. These results strongly show that CD27/CD70 interaction directly enhances NK activity in the presence of IL-2 or IL-12 by increasing the effector and target conjugate formation, indicating that CD27/CD70 interaction plays an important role in the cytotoxic function of NK cells.
authors.affiliation: Department of Pediatrics, Shinshu University School of Medicine, Matsumoto, Japan.
authors.forename: F C
authors.initials: FC
authors.lastname: Yang
authors.forename: K
authors.initials: K
authors.lastname: Agematsu
authors.forename: T
authors.initials: T
authors.lastname: Nakazawa
authors.forename: T
authors.initials: T
authors.lastname: Mori
authors.forename: S
authors.initials: S
authors.lastname: Ito
authors.forename: T
authors.initials: T
authors.lastname: Kobata
authors.forename: C
authors.initials: C
authors.lastname: Morimoto
authors.forename: A
authors.initials: A
authors.lastname: Komiyama
mesh_terms: D015703:Antigens, CD; D053282:CD27 Ligand; D002478:Cells, Cultured; D003602:Cytotoxicity, Immunologic; D005434:Flow Cytometry; D006801:Humans; D018664:Interleukin-12 / Q000276:immunology; D007376:Interleukin-2 / Q000276:immunology; D007694:Killer Cells, Natural / Q000276:immunology*; D008565:Membrane Proteins / Q000276:immunology* / Q000502:physiology; D014162:Transfection
chemical_list: D015703:Antigens, CD; D053282:CD27 Ligand; C505771:CD70 protein, human; D007376:Interleukin-2; D008565:Membrane Proteins; D018664:Interleukin-12