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Chapter 101  Natural Killer Cell–Based Therapies  1581


            being  tested  by  use  of  NK  cell  donor  lymphocyte  infusions  after   working  to  establish  proof  of  concept  and  to  develop  exportable
            haploidentical  HCT  in  adults  with  AML.  A  published  study  in   techniques. Development of platforms that support robust in vivo or
            pediatric patients used NK cells as consolidation therapy to maintain   ex vivo NK cell expansion and education, selection of NK donors
            remissions in a nontransplant setting. This platform is being adapted   based on their NK cell receptor genes, manipulation of tumor NK
            for  testing  in  elderly  AML  patients.  Additional  studies  to  explore   cell receptor ligand expression, and coordination of NK cell interac-
            applications in multiple myeloma, lymphoma, and solid tumors are   tions with other immune cells are underway at many institutions.
            being developed.                                      Ultimately,  combination  therapy  using  several  strategies  will  likely
                                                                  prove most successful. In particular, cytokines such as IL-15, antibod-
                                                                  ies  to  block  inhibitory  receptors,  methods  to  induce  adaptive  NK
            FUTURE DIRECTIONS                                     cells with properties of immune memory, and the use of BiKEs or
                                                                  TriKEs to make NK cells antigen-specific hold great promise.
            Several promising strategies to exploit NK cell alloreactivity to treat
            cancer  are  in  development.  These  include  various  approaches  to
            develop in vivo or ex vivo expanded products, manipulations of the   REFERENCES
            host immune system, and strategies to modify the tumor targets to
            enhance their sensitivity to NK cell–mediated killing (Fig. 101.2).   1.  Freud AG, Yokohama A, Becknell B, et al: Evidence for discrete stages
            Unlike T cells, haplotype mismatched or completely HLA-mismatched   of human natural killer cell differentiation in vivo. J Exp Med 203:1033,
            NK  cells  can  be  given  without  risk  of  GVHD,  although  a  recent   2006.
            report cautions that conclusion when using highly expanded NK cells   2.  Huntington ND, Legrand N, Alves NL, et al: IL-15 trans-presentation
            ex vivo using membrane bound IL-15 and 41BB-ligand K562 feeders,   promotes human NK cell development and differentiation in vivo. J Exp
            because some patients developed a syndrome that histologically and   Med 206:25–34, 2009.
                                              40
            clinically was indistinguishable from GVHD.  Adoptive transfer is   3.  Walzer T, Dalod M, Robbins SH, et al: Natural-killer cells and dendritic
            limited by the cell dose attained from a single leukopheresis and the   cells: “l’union fait la force”. Blood 106:2252–2258, 2005.
            current requirement for high dose lymphodepleting chemotherapy.   4.  Lopez-Botet  M,  Angulo  A,  Guma  M:  Natural  killer  cell  receptors
            In vivo expansion, while detectable, is transient and appears to require   for major histocompatibility complex class I  and related molecules in
            the use of exogenous cytokines such as IL-2, which is associated with   cytomegalovirus infection. Tissue Antigens 63:195–203, 2004.
            induction  of  suppressive  regulatory T  cells. The  use  of  IL-15  (or   5.  Liu  J,  Xiao  Z,  Ko  HL,  et al:  Activating  killer  cell  immunoglobulin-
            IL-15/IL-15Rα complexes to trans present IL-15), the true homeo-  like  receptor  2DS2  binds  to  HLA-A*11.  Proc  Natl  Acad  Sci  USA
            static factor for NK cells, is now being tested in patients receiving   111:2662–2667, 2014.
            adoptively transferred NK cells to treat their AML or posttransplant   6.  Kim S, Poursine-Laurent J, Truscott SM, et al: Licensing of natural killer
            relapse. A major advantage of IL-15 is that unlike IL-2, it does not   cells by host major histocompatibility complex class I molecules. Nature
            stimulate regulatory T cells. Various methods to enrich the NK cell   436:709–713, 2005.
            fraction in haploidentical apheresis products are being tested, includ-  7.  Raulet DH: Missing self recognition and self tolerance of natural killer
            ing depletion of T (CD3) and B (CD19) cells, or positive selection   (NK) cells. Semin Immunol 18:145–150, 2006.
                   +
            for CD56  NK cells. Several investigators are also exploring ex vivo   8.  Parham P: Taking license with natural killer cell maturation and reper-
            NK expansion using EBV-transformed or modified K562 feeder cells   toire development. Immunol Rev 214:155–160, 2006.
            to increase the infused NK cell dose, potentially circumventing the   9.  Joncker NT, Shifrin N, Delebecque F, et al: Mature natural killer cells
            need for in vivo expansion. The use of “off-the-shelf” NK cell lines,   reset  their  responsiveness  when  exposed  to  an  altered  MHC  environ-
            such as NK-92, may provide a large supply of highly cytotoxic NK   ment. J Exp Med 207:2065–2072, 2010.
            cells  that  could  be  used  for  repeated  infusions.  Other  approaches   10.  Elliott JM, Wahle JA, Yokoyama WM: MHC class I-deficient natural
            using NK cell products derived from UCB or placental progenitors,   killer cells acquire a licensed phenotype after transfer into an MHC class
            embryonic  stem  cells,  or  induced  iPS  cell  sources  are  also  being   I-sufficient environment. J Exp Med 207:2073–2079, 2010.
            developed.  UCB  stem  cell–derived  ILC  that  produce  IL-22  may   11.  Brodin P, Karre K, Hoglund P: NK cell education: not an on-off switch
            enhance  tissue  integrity  and  improve  immune  reconstitution  after   but a tunable rheostat. Trends Immunol 30:143–149, 2009.
            HCT. Alternative forms of activation, such as combining NK cells   12.  Feuchtinger T, Pfeiffer M, Pfaffle A, et al: Cytolytic activity of NK cell
            with either toll-like receptor agonists and/or dendritic cell vaccines,   clones against acute childhood precursor-B-cell leukaemia is influenced
            are also being explored. Other possibilities are being aimed at sensitiz-  by HLA class I expression on blasts and the differential KIR phenotype
            ing  the  target  cells  using  chemotherapy  (bortezomib  or  histone   of NK clones. Bone Marrow Transplant 43:875–881, 2009.
            deacetylase  inhibitors),  or  irradiation.  Lastly,  if  cytokines  such  as   13.  Di Santo JP: Staying innate: transcription factor maintenance of innate
            IL-15 can safely and efficiently expand autologous NK cells in vivo,   lymphoid cell identity. Immunol Rev 261:169–176, 2014.
            it may be possible to mimic an allogeneic approach by in vivo or ex   14.  Horowitz  A,  Strauss-Albee  DM,  Leipold  M,  et al:  Genetic  and  envi-
            vivo expansion of NK cells. Combining these with antibodies (anti-  ronmental determinants of human NK cell diversity revealed by mass
            KIR and anti-NKG2A) that block inhibitory receptors or BiKEs that   cytometry. Sci Transl Med 5:208ra145, 2013.
            deliver  potent  activation  signals  that  overcome  inhibition  through   15.  Ruggeri L, Mancusi A, Burchielli E, et al: Effectiveness of donor natural
            class I MHC receptors may be incredibly powerful.        killer cell alloreactivity in mismatched hematopoietic transplants. Science
                                                                     295:2097–2100, 2002.
                                                                  16.  Brunstein CG, Wagner JE, Weisdorf DJ, et al: Negative effect of KIR
            CONCLUSION                                               alloreactivity in recipients of umbilical cord blood transplant depends
                                                                     on  transplantation  conditioning  intensity.  Blood  113:5628–5634,
            The therapeutic use of NK cells is a promising strategy to treat cancer   2009.
            in  both  transplant  and  nontransplant  settings.  NK  cells  have  the   17.  Willemze R, Rodrigues CA, Labopin M, et al: KIR-ligand incompatibil-
            potential  to  induce  graft-versus-tumor  effects  without  inducing   ity in the graft-versus-host direction improves outcomes after umbilical
            GVHD. To date, the majority of data supporting the antileukemic   cord blood transplantation for acute leukemia. Leukemia 23:492–500,
            effect of NK cells has emerged from the allo-HCT literature. However,   2009.
            the  complexities  of  allo-HCT,  including  variations  in  preparative   18.  Venstrom  JM,  Zheng  J,  Noor  N,  et al:  KIR  and  HLA  genotypes  are
            regimens, stem cell sources, graft products, posttransplant immune   associated  with  disease  progression  and  survival  following  autologous
            suppression, and disease specific differences all complicate our under-  hematopoietic  stem  cell  transplantation  for  high-risk  neuroblastoma.
            standing  of  the  underlying  biologic  mechanisms.  This  limits  the   Clin Cancer Res 15:7330–7334, 2009.
            design of effective therapies exploiting NK cell alloreactivity. Investi-  19.  Yu J, Venstrom JM, Liu XR, et al: Breaking tolerance to self, circulating
            gators developing strategies using adoptive transfer of NK cells are   natural killer cells expressing inhibitory KIR for non-self HLA exhibit
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