title: Circulating natural killer lymphocytes are potential cytotoxic effectors against autologous malignant cells in sezary syndrome patients.
abstract: Patients with advanced cutaneous T cell lymphoma (CTCL) exhibit profound defects in cell-mediated immunity. Although it has been suggested that Sezary syndrome (SS) patients have a decreased natural killer (NK) lymphocyte activity, nothing has been reported concerning the sensitivity of Sezary cells to NK lymphocyte-mediated cytotoxicity. Peripheral blood NK cells from healthy donors were tested against Sezary tumoral cell lines as well as against freshly isolated Sezary cells. Further, we studied their ability to exhibit antibody -dependent cell-mediated cytotoxicity using either the murine anti-CD158k/KIR3DL2 monoclonal antibody (moAb) AZ158 that specifically recognizes Sezary cells, or the anti-CD52 monoclonal antibody alemtuzumab. The results show that Sezary cell lines are susceptible to NK lymphocyte lysis. More importantly, we found that freshly isolated malignant cells are killed either by IL-2 activated allogeneic NK lymphocytes or when the tumor lymphocyte targets are incubated with an anti-MHC class I F(ab)'2 antibody. Further, anti-KIR3DL2 and anti-CD52 moAb can enhance the NK lysis. Finally, we report that NK lymphocytes isolated from SS patients are potentially cytotoxic lymphocytes against autologous malignant Sezary cells. These findings indicate that antitumor-mediated NK lymphocyte cytotoxic activity can be triggered in patients with CTCL and raise the possibility of developing novel therapeutic strategies by stimulating their innate immunity.
authors.affiliation: INSERM 659, Faculté de Médecine de Créteil 8, rue de général Sarrail, Créteil, France.
authors.forename: Jean-David
authors.initials: JD
authors.lastname: Bouaziz
authors.forename: Nicolas
authors.initials: N
authors.lastname: Ortonne
authors.forename: Jérôme
authors.initials: J
authors.lastname: Giustiniani
authors.forename: Valérie
authors.initials: V
authors.lastname: Schiavon
authors.forename: Delphine
authors.initials: D
authors.lastname: Huet
authors.forename: Martine
authors.initials: M
authors.lastname: Bagot
authors.forename: Armand
authors.initials: A
authors.lastname: Bensussan
mesh_terms: D015703:Antigens, CD / Q000032:analysis; D045744:Cell Line, Tumor; D003602:Cytotoxicity, Immunologic; D004198:Disease Susceptibility; D005434:Flow Cytometry; D006801:Humans; D007694:Killer Cells, Natural / Q000276:immunology*; D012751:Sezary Syndrome / Q000235:genetics / Q000276:immunology*
chemical_list: D015703:Antigens, CD