title: Preparation of Cytokine-activated NK Cells for Use in Adoptive Cell Therapy in Cancer Patients: Protocol Optimization and Therapeutic Potential.
abstract: Cell-based immunotherapy using donor-derived natural killer (NK) cells after allogeneic hematopoietic stem cell transplantation may be an attractive treatment of residual leukemia. This study aimed to optimize clinical grade production of a cytokine-activated NK-cell product. NK cells were isolated either by double depletion (CD3(-), CD19(-)) or by sequential depletion and enrichment (CD3(-,) CD56(+)) via CliniMACS from leukapheresis material and cultured in vitro with interleukin (IL)-2 or IL-15. Both NK cell isolation procedures yielded comparable recovery of NK cells and levels of T-cell contamination. After culture with cytokines, the CD3(-)CD56(+) procedure resulted in NK cells of higher purity, that is, less T cells and monocytes, higher viability, and a slightly higher yield than the CD3(-)CD19- procedure. CD69, NKp44, and NKG2A expression were higher on CD3(-)CD56(+) products, whereas lysis of Daudi cells was comparable. Five days of culture led to higher expression of CD69, NKp44, and NKp30 and lysis of K562 and Daudi cell lines. Although CD69 expression and lysis of Daudi cells were slightly higher in cultures with IL-2, T-cell contamination was lower with IL-15. Therefore, further experiments were performed with CD3(-)CD56(+) products cultured with IL-15. Cryopreservation of IL-15-activated NK cells resulted in a loss of cytotoxicity (>92%), whereas thawing of isolated, uncultured NK cells followed by culture with IL-15 yielded cells with about 43% of the original lytic activity. Five-day IL-15-activated NK cells lysed tumor target cell lines and primary leukemic blasts, providing the basis for NK cell–based immunotherapeutic strategies in a clinical setting.
authors: *Pediatric Immunology Laboratory, Department of Pediatrics Departments of ‡Medical Statistics §Immunohematology and Blood Bank, Leiden University Medical Center, Leiden, The Netherlands †IRCCS AOU San Martino-IST, Genoa, Italy.
authors: Monique M
authors: MM
authors: van Ostaijen-ten Dam
authors: Henk-Jan
authors: HJ
authors: Prins
authors: Gerharda H
authors: GH
authors: Boerman
authors: Carly
authors: C
authors: Vervat
authors: Daniela
authors: D
authors: Pende
authors: Hein
authors: H
authors: Putter
authors: Arjan
authors: A
authors: Lankester
authors: Maarten J D
authors: MJ
authors: van Tol
authors: Jaap J
authors: JJ
authors: Zwaginga
authors: Marco W
authors: MW
authors: Schilham
mesh_terms: D015703:Antigens, CD / Q000378:metabolism; D002454:Cell Differentiation; D049109:Cell Proliferation; D002478:Cells, Cultured; D015925:Cryopreservation; D055612:Cytokine-Induced Killer Cells / Q000276:immunology* / Q000637:transplantation; D016207:Cytokines / Q000378:metabolism; D003602:Cytotoxicity, Immunologic; D018380:Hematopoietic Stem Cell Transplantation; D006801:Humans; D007694:Killer Cells, Natural / Q000276:immunology* / Q000637:transplantation; D007938:Leukemia / Q000276:immunology / Q000628:therapy*
chemical_list: D015703:Antigens, CD; D016207:Cytokines