The goal of this STTR grant application is to engineer powerful NK cell-based cytolytic effector cells for therapeutic applications. The cells will combine the selectivity and specificity of T cells and the ability of NK cells to mediate effective cytolytic activity against a wide spectrum of aberrant cells, including those with impaired adhesion properties. To achieve this goal we intend to endow NK92 cytolytic cells with either the entire ¿¿ T-cell receptor (TCR)-CD3 complex or a chimeric antigen receptor (CAR) with the same specificity. In our previous work we developed "in vitro evolution" approaches to increase the affinities of native TCRs. Using this approach, we have developed high-affinity TCRs and CARs that are specific for different viral- or cancer- associated epitopes. While both of these receptors bind the antigen with high affinity, receptor-mediated signaling will differ due to differences in the receptor's intracellular signaling domain. The kinetics of signaling mediated by two distinct signaling domains of these receptors is expected to affect the efficiency, and possibly the sensitivity, of target cell lysis by NK92-TCR-CD3 and NK92-CAR cytolytic effectors. Because the gene- modified NK92 cells have to be irradiated prior to their transfer to patients, they will be capable of exercising cytolytic activity against target cells for up to 5 days. Thus, the kinetics of target cell destruction becomes a critical factor determining the efficiency of NK92-based cytolytic effectors. The results obtained will enable us to choose the NK92 effector that will exercise the most efficient cytolytic activity against virus-infected and cancer cells in clinical trials. As opposed to adoptively transferred peripheral T cells with either a TCR or a CAR, the potential toxicity of the irradiated NK92-CAR and NK92-TCR-CD3 effectors will be minimized due to the limited persistence of the irradiated effectors. However, NK92 effectors could be transferred to a patient multiple times to generate effective activity against the virus-infected or cancer cells. The novel cytolytic effectors will be available in large amounts and could be utilized for treatment of patients with different genetic backgrounds, thus providing significant advantage over existing T cell adoptive transfer therapies.
Public Health Relevance Statement: Public Health Relevance: Using the available cytotoxic NK92 cell line, we will develop superior cytolytic effector cells endowed with high- affinity T-cell antigen receptors specific for virus- and cancer-associated epitopes. Such superior cytolytic effectors will be utilized as a potent cell-based immunotherapeutic to facilitate eradication of virus-infected and cancer cells.
Project Terms: Adhesions; Adoptive Transfer; Affect; Affinity; Antigen Receptors; Antigens; Applications Grants; base; Biotechnology; cancer cell; Cancer Patient; CD3 Antigens; CD94 Antigen; Cell Adhesion Molecules; Cell Line; Cells; chimeric antigen receptor; Chronic Phase; Clinical Trials; Collaborations; Complement; Complex; Cytolysis; Cytoplasmic Granules; cytotoxic; Development; Diagnostic Neoplasm Staging; Effector Cell; Engineering; Epitopes; Evolution; Exercise; Failure (biologic function); fighting; Foundations; Gagging; Gene-Modified; Genes; Genetic; Goals; HIV; HIV therapy; HLA-A2 Antigen; Human; Human Cell Line; Illinois; Immune system; Immunity; immunogenicity; Immunotherapeutic agent; In Vitro; Infection; interest; Intervention; ITAM; Killings; Kimmel Cancer Center at the Thomas Jefferson University; Kinetics; Legal patent; Licensing; Link; Lymphocyte; Malignant Neoplasms; Mediating; melanoma; MHC Class I Genes; Mortality Vital Statistics; Mutation; Natural Killer Cells; novel; Patients; Peptides; Peripheral; Pharmacologic Substance; Phase; Play; Population; Property; Proteins; public health relevance; receptor; receptor binding; Receptor Gene; receptor-mediated signaling; Research; Rights; Role; Scientist; Signal Transduction; Signaling Protein; SL9 peptide; Small Business Technology Transfer Research; Specificity; Surface; System; T-Cell Immunologic Specificity; T-Cell Receptor; T-Lymphocyte; Technology; Testing; Therapeutic; Time; Toxic effect; tumor; tumor progression; Universities; Viral; Viral Cancer; Virus; Work; Yeast
