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Designer T and NK Cells in Glioblastoma Immunotherapy
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Glioblastoma (GBM) is the most prevalent, aggressive primary brain tumour with a dismal prognosis. Gene editing technologies are a game changer, enabling design of novel molecular-immunological treatments to be used in combination with chemoradiation, to achieve long lasting survival benefits for patients. Designer T and NK cells are a modality within immunotherapy that manipulates receptor-ligand interactions to enhance cells of the immune system to destroy cancer more effectively. Patient’s own immune cells are isolated, genetically modified to improve responses against cancer cells, expanded, and subsequently reintroduced into the individual.

  • glioblastoma
  • genomic heterogeneity
  • natural killer cells
  • T cells
  • chimeric antigen receptor
  • CRISPR/Cas9
  • immunotherapy
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Subjects: Oncology
Contributors : ,
View Times: 58
Revisions: 3 times (View History)
Update Time: 29 Mar 2022

1. T Cell Patrols with a License to Kill

Patrolling leukocytes detect mutated, early transformed cells, deem them sufficiently “non-self” and co-ordinately eliminate them, as predicted by the cancer immunosurveillance concept [1]. As cells undergo oncogenesis, neoantigens are released and captured on major histocompatibility complex (MHC)/ human leukocyte antigen (HLA) of dendritic cells (DCs) that subsequently mature and migrate to central lymphoid organs. Here, the peptide neoantigen on the DCs’ MHC is presented to the awaiting CD4+ or CD8+ T cell receptor (TCR) complex. Subsequently, binding of the CD28 co-stimulatory receptor to the DCs’ CD80/86 receptor fully activates the cytotoxic T cells which then migrate to infiltrate the tumour and kill the cells by locally releasing perforin and granzymes [2][3]. These lymphocytes successfully eliminate the genetically unstable tumour cells with intrinsically high immunogenicity [4] through a series of successive stages [5]. The T cells also effectively terminate their activation and proliferation as a means of avoiding autoimmunity, resulting in different phenotypes that either further activate Th1 immune responses or suppress via Th2-driven responses. Surface receptors such as cytotoxic T-lymphocyte-associated protein 4 (CTLA-4), programmed cell death protein 1 (PD-1) and nuclear transcription factors attenuate T cell responses, where CTLA-4 competes with CD28 for binding to CD80/86, resulting in inhibitory downstream signalling [6]. PD-1 is an immunoinhibitory receptor that stymies lymphocyte proliferation and cytokine secretion when bound to its membrane-bound or secreted ligands, PD-L1 or PD-L2, expressed by both immune and tumour cells [7]. In addition, activated T cells can express an inducible co-stimulator (iCOS), a surface receptor that is structurally and functionally similar to CD28 and enhances expression of Th2-related interleukin (IL)-10 rather than immune activating IL-2 [8]. This immunosuppressive helper T cell phenotype can be further induced by the zinc-finger transcription factor GATA3, which regulates Th2 cytokine expression [9]. Infiltrating CD8+ T cells in GBM have been shown to bear an exhausted phenotype, with upregulated expression of PD-1, LAG-3, TIGIT and CD39 [10][11][12].
GBM is considered an immunologically “cold tumour” due to the immunosuppressive microenvironment [12][13] and few immunogenic tumour-associated antigens (TAAs) [14]. The rapidly growing tumour alters the balance of interaction between cancer and immune cells, by outstripping its metabolic resources and shifting to glycolysis [15]. Cancer cells also recruit and alter nearby stromal cells to aid the tumour cells in avoiding immune detection and destruction [16][17]. Competition for glucose results in low pH, which creates a hostile tumour microenvironment [18][19][20] and drives a local increase in immunosuppressive stromal cells (Figure 1). These cells secrete immune inhibitory growth factors and cytokines, including vascular endothelial growth factor (VEGF), which is primarily produced by microglia, myeloid-derived suppressor cells (MDSCs) and tumour-associated macrophages (TAMs). TAMs and regulatory T cells such as the CD8+ CD28- FoxP3+ Treg cells also secrete immunosuppressive IL-10 [12] which downregulates interferon gamma (IFNγ) and MHC I through the JAK/STAT pathway [21]. Accumulating MDSCs are rendered in an immature state [22], secreting IL-13, which when bound to IL13Rα2, send anti-inflammatory signals to promote the alternative M2 phenotype in macrophages, causing them to lose their cytotoxic function and instead become immunosuppressive. Tumour cells aid in this immunosuppression by secreting transforming growth factor β (TGFβ) and expressing both membrane-bound and soluble PD-L1, inducing exhaustion in T and NK cells [23][24]. Moreover, the molecular heterogeneity of GBM, observed as cells with wildly dissimilar molecular genetic aberrations within the same tumour mass [25][26] allows the tumour microenvironment to evolve and adapt to the immunological selection pressure. These conditions lead to immune escape and an immune-edited microenvironment that is refractory to killing by cytotoxic lymphocytes, while promoting resistance to standard treatments. New, personalised therapies that specifically address these molecular, genetic and immunological challenges are sorely needed.
Figure 1. Schematic representation of the glioblastoma (GBM) tumour microenvironment. The evolving tumour microenvironment consists of diffusely infiltrative tumour cells with a leaky neovasculature, anti-inflammatory stromal cells and high concentrations of immunosuppressive cytokines and signalling molecules. Together, these factors generate a hostile environment where proliferation and persistence of cytotoxic immune cells are significantly hampered. TAM, tumour-associated macrophage; MDSC, myeloid derived suppressor cell; Treg, regulatory T cell; NK cell, natural killer cell; TGFβ, transforming growth factor β; PD-1, programmed cell death protein 1; PD-L1, programmed death-ligand 1; CTLA-4, cytotoxic T lymphocyte-associated protein-4; IL-13, interleukin-13; IL-10, interleukin-10; VEGF, vascular endothelial growth factor; MHC I, major histocompatibility complex class I; JAK/STAT, Janus kinase/signal transducers and activators of transcription; RTK, receptor tyrosine kinase; mTOR, mammalian target of rapamycin.

2. Challenging Solid Brain Tumours with Natural Killers

Another approach recently translated into clinical trials is chimeric antigen receptor (CAR) NK therapy. CARs are a synthetic, modified representation of the TCR complex, that contains both an antigen-binding site and a T cell costimulatory domain that allows for autonomous, MHC-independent activation of the T cells [27][28]. They consist of an extracellular single-chain variable fragment (ScFv) derived from an antibody, and an intracellular domain with signalling motifs. Over time, adjustments made to CARs have targeted their structure; where first-generation CARs contained the intracellular CD3ζ from a TCR, second-generation CARs included the costimulatory CD28 or 4-1BB endodomains fused to CD3ζ (reviewed in [29]). Originally, the only difference between CAR T and CAR NK cells was the lymphocyte that held the CAR. The CARs had the same structure in both lymphocytes, since CARs with the CD3ζ chain alone or in combination with other costimulatory domains also promoted NK cell activation [30]. However, as the field advanced, domains from adaptor molecules associated with NK receptors such as DAP10 and DAP12 have been introduced. While CAR NK cells with a DAP10 domain showed poor efficiency [31], CAR NK cells with DAP12 demonstrated enhanced cytotoxicity when compared with those with CD3ζ [32].
Cytotoxic T cells and NK cells differ in many ways. Unlike T cells, NK cells are innate lymphocytes that specialise in recognising and killing transformed- and virus-infected cells through germline-encoded receptors that yield activating or inhibiting signals when interacting with target cell surface ligands [33][34][35]. Activating receptors include the natural cytotoxicity receptors NKp30 [36], NKp44 [37] and NKp46 [38], NK group 2 D (NKG2D) receptor [39], and killer immunoglobulin-like receptors (KIRs) with short cytoplasmic domains [40][41][42]. With these receptors, educated, cytotoxic CD56dim NK cells can become activated and kill tumour cells through a variety of mechanisms [43][44]. We have shown that NK cells that selectively express particular KIRs potently kill GBM cells and GBM stem-like cells [42][45][46]. A recent study showed enhanced killing capability of NK cells against GBM stem-like cells when inhibiting αv integrin or TGFβ [47]. Unlike CAR T cells, in the event of antigen loss by the tumour cells, CAR NK cells may still possess the ability to kill by their intrinsic activating receptors [48][49][50][51][52]. In addition, CAR NK cells are considered safer than CAR T cells since they are not known to induce immune effector cell-associated neurotoxicity syndrome (ICANS) or cytokine release syndrome (CRS) [53][54][55].
Importantly, allogeneic T cells are known to induce graft-versus-host disease (GvHD) while NK cells do not [53]. Autologous T cell therapy may not be amenable for all patients since those with significant lymphopenia due to prior anti-cancer treatments or those with a rapidly progressive disease will not be eligible due to insufficient numbers of T cells to expand into therapeutic doses of CAR T cells. This is important for GBM, as both treated and treatment-naïve GBM patients experience lymphopenia [56]. The protracted time required for CAR T cell production is also a bottleneck [55]. The first CAR NK cell approaches focused on primary peripheral blood-derived NK cells transfected with the CAR construct [57], but NK cells are more difficult to transfect than T cells [58]. To circumvent difficulties in introducing gene edits to NK cells, a recent publication has outlined a method for efficient electroporation of CRISPR-associated Cas9 ribonuclear protein (RNP) complexes in primary NK cells [59]. A similar protocol has been used to efficiently knock out the immune checkpoint receptor T-cell immunoglobulin mucin family member 3 (TIM3) in primary NK cells from healthy donors [60], PD-1 [61], and CD38 [62]. However, NK cells only represent approximately 5–15% of circulating lymphocytes in healthy adult humans [63] and require extensive ex vivo expansion. Additionally, they have a much shorter life span than T cells [64], although the persistence of CD-19-directed, IL-15 expressing CAR NK cells from cord blood were shown to survive for at least 4 weeks in mouse models [65]. In humans, multiple or higher doses of engineered NK cells might be required for a sustained treatment effect. NK cells may be obtained from various tissue sources, however, such as umbilical cord blood, induced pluripotent stem cells (iPSCs) or cell lines, such as NK-92 [66]. This characteristic provides the opportunity for “off-the-shelf” cells that can be applied to any patient, which is less readily achieved with autologous T cell therapies [58]. However, the possibility of a host-versus-graft scenario, where the implanted cells are systematically destroyed by the host immune system, must also be considered. Research into the production of reliable, “off-the-shelf” alternatives for cancer immunotherapy is currently in progress for both T and NK cells (reviewed in [67][68]). Strategies to avoid GvHD include knockout of the TCR in engineered T cells [69][70], while host attacks and graft rejection may be mitigated through knockout of MHC or application of lymphodepleting chemotherapeutics prior to engineered T/NK cell administration [71][72][73][74]. In GBM, NK cells have been shown to comprise only a small portion of immune cells in the tumour microenvironment, and to have a CD56+ CD16- phenotype [12], indicating that these cells may not be capable of killing CAR-expressing cells. Another opportunity may lie in NK cells’ inherent expression of KIR2DL4, which can bind HLA G to inhibit host NK cells [75][76].
The heterogeneity of GBM creates a significant challenge for the identification of a ubiquitously expressed tumour specific target for CAR constructs. In addition, GBM cells grown in stem cell media, which most closely preserve the original tumour phenotype, tend to exhibit reduced expression of both classical and non-classical MHC class I ligands for inhibitory NK receptors [12][77]. Therefore, these conditions, if present within patient tumour microenvironments, may provide additional opportunities for receptor mediated cytotoxicity in CAR NK cells [78][79] via both KIR and natural cytotoxicity receptors against stress-induced ligands known to be expressed by GBM tumour cells [45][46][80]. Bispecific TanCAR NK cells could be used to mitigate possible tumour escape by targeting two antigens [81]. As such, the choice of either CAR T or NK cell therapy depends on the strategy utilised, as the two provide different advantages and disadvantages, as summarised in Table 1. Taken together, CAR NK cells represent potentially superior effectors for solid tumours such as GBM.
Table 1. Comparisons between CAR T and NK cell therapies.

Comparisons to Consider

CAR T

CAR NK

Cell source Autologous setting Allogeneic setting or cell lines [66]
Off-the-shelf Not eligible Eligible [58]
GvHD Induces GvHD Not known to induce GvHD
Gene delivery Effective by transfection or transduction Effective by Cas9 RNP
Patients as candidates Restricted to patient’s condition All patients are potential candidates
Off-target effects ICANS/CRS [82][83] No/minimal ICANS or CRS
Response to antigen loss No alternative mechanism Response by existing NK cell receptors
Infusion dose Single/few doses Multiple or high
In vivo persistency Longer (several months) [84] Shorter (days to weeks) [64]
FDA/EMA approval Approved [85][86] Not yet approved
Cancer indication Haematological malignancies [87] Alternative for solid tumours
GvHD, graft versus host disease; RNP, ribonuclear protein; ICANS, immune effector cell-associated neurotoxicity syndrome; CRS, cytokine release syndrome; FDA, U.S. Food and Drug Administration; EMA, European Medicines Agency.

In Vitro and In Vivo Clinical Studies for Designer NK Cells in GBM

The preclinical demonstration of the anti-tumour efficacy of CAR NK cells in haematological malignancies [31][88] has stimulated a number of clinical trials involving patients with these cancers (reviewed in [89]). Some CAR NK cell approaches proposed for the treatment of GBM have also demonstrated anti-tumour efficacy and extended animal survival in preclinical settings. Murakami et al. established a CAR KHYG-1 NK cell line which exhibited capacity for killing epidermal growth factor receptor (EGFR) variant III (EGFRvIII)-expressing GBM cells in vitro [90]. However, it lacked in vivo anti-tumour efficacy in mice ectopically injected with GBM cells [91]. Genßler et al. and Han et al. successfully generated CAR NK-92 cells bispecific for wild type EGFR and EGFRvIII and demonstrated their efficacy in GBM both in vitro and in vivo, when injected intracranially in GBM-bearing mice [92][93]. Furthermore, Zhang et al. showed the efficacy of another NK-92 CAR cell line, the NK-92/5.28.z, which is specific for human epidermal growth factor receptor 2 (HER2)/ErbB2, against GBM both in vitro and in vivo, through intratumoural injections into the brain [94]. Interestingly, these are the only CAR NK cell therapy constructs being tested in clinical trials for human GBM (clinical trial ID NCT03383978, CAR2BRAIN), although other avenues for CAR NK in GBM are in development (reviewed in [95]). The CAR2BRAIN study is in phase I, aiming to be completed by December 2022, with the primary goals of assessing safety and tolerability, persistence of NK-95/5.28.z cells and cytokine profile in cerebrospinal fluid and blood for 24 weeks after injection. The patients undergoing this trial receive only one injection of the engineered cells, and so far, no dose-limiting effects have been reported. Nevertheless, it remains to be seen if this and future trials will have to incorporate more doses to see a sustained benefit.

3. Picking a Suitable Target for GBM Immunotherapy

In GBM, heterogenous mutations are typically not immunogenic [96][97], which renders the tumours resistant to new generation immunotherapies, including CAR T and immune checkpoint blockade (reviewed in [98][99]). Choosing one or more suitable targets is critical for a sustained, beneficial effect. In addition to absent or limited expression in healthy tissues, the target antigen must have persistent expression on the tumour cells and present an appropriate affinity to the CAR which allows recognition of the target with low off-target toxicity [100]. An overview of immunotherapeutic targets for the treatment of GBM currently in clinical trials is shown in Table 2, which includes EGFRvIII, HER2/ErbB2, interleukin-13 receptor alpha 2 (IL13Rα2), B7H3 and NKG2D ligands. Although T cell exhaustion may be limited by targeting CTLA-4 and PD-1, chemotherapeutics with monoclonal antibodies against CTLA-4, PD-1 and PD-L1 have shown mixed and unpredictable response in GBM [101]. In a recent publication, however, Cloughesy et al. performed a randomised, early phase clinical trial using neoadjuvant pembrolizumab, a PD-1 inhibitor, which showed both overall and progression-free survival benefit to patients with recurrent GBM when applied both before and after surgery [102]. These results emphasize the importance of timing of treatment.
Table 2. Current targets used in CAR T and NK cell therapy for GBM.
Clinical Trial ID Target Cell Type/Expression Trial Method Trial Status Reference
NCT03726515, NCT01454596 EGFRvIII Glioma cells, 64% of GBM cases CAR T Completed, completed [103]
NCT03383978,
NCT01109095
HER2/ErbB2 Tumour cells, normal endothelial and neuronal brain cells (low expression) CAR NK Recruiting, completed [104]
NCT04003649, NCT02208362 IL13Rα2 Tumour cells, TAMs, MDSCs, overexpressed in 50% of GBM cases CAR T Recruiting, recruiting [103]
NCT04077866, NCT04385173 B7H3 DC, T cells, overexpression on GBM tumour cells CAR T Recruiting, recruiting [105]
NCT04270461 NKG2DL Receptor expressed on NK, NKT and T cells, ligands expressed on tumour cells CAR T Withdrawn [48]
EGFRvIII, epidermal growth factor receptor variant III; HER2, human epidermal growth factor receptor 2; ErbB2, Erb-B2 Receptor Tyrosine Kinase 2; IL13Rα2, interleukin 13 receptor subunit alpha 2; B7H3, B7 homologue 3; NKG2D, natural killer group 2 member D; TAM, tumour-associated macrophage; MDSC, myeloid-derived suppressor cell; DC, dendritic cell; NKT, natural killer T cell.

3.1. Growth Factor Receptors as Targets

One of the initial targets for GBM immunotherapy trials with CAR T cells was EGFRvIII, a constitutively active mutated variant of the EGFR receptor. Currently, there are ten active CAR T treatments for GBM in clinical trials, two of which target EGFRvIII (clinical trial ID NCT01454596 and NCT03726515). Results from different studies are contradicting based on the independent prognostic value of EGFRvIII in GBM for overall survival of newly diagnosed patients with EGFRvIII positive tumours [106][107]. A phase I clinical trial reported that a single infusion of EGFRvIII-directed CAR-T cell led to loss of antigen, and induction of adaptive resistance through increased PD-L1, IDO1, IL-10 and the presence of FoxP3+ Treg cells [108]. These results highlight the problems of early antigen loss and swift immunosuppressive response in these patients. HER2/ErbB2 is structurally homologous to EGFR, and mRNA has been found in 76% of primary GBM cell lines [109]. However, its expression levels in normal brain tissue, especially neuronal and endothelial cells of the cerebral cortex [110], pose difficulties in developing immunotherapy options with tolerable side-effects for brain tumour application. Nevertheless, pre-clinical studies demonstrated HER2-specific T lymphocyte cytotoxicity against GBM stem-like cells that was not evident in HER2- cells [104]. In addition, HER2-directed CAR NK cells engineered from healthy donors and breast cancer patients have been shown to selectively kill HER2+ tumour cells while avoiding healthy cells in vitro [111]. HER2 is also currently the only target used for CAR NK cell therapy in human trials for GBM with the CAR2BRAIN study in Germany (clinical trial ID NCT03383978), as mentioned above.

3.2. Interleukin-13 Receptor Alpha 2

IL13Rα2 is another cancer-associated receptor currently used in CAR T cell therapy for GBM (clinical trial ID NCT04003649 and NCT02208362). Overexpression in GBM coupled with low to no detectable levels in healthy brain tissue render IL13Rα2 a suitable target for immunotherapy [103]. The native IL13Rα2 has been reported to induce an invasive phenotype in GBM by promoting epithelial-mesenchymal transition. However, through interaction with EGFRvIII, IL13Rα2 signalling induces proliferation through activation of the STAT3 pathway [112]. Thus, dual targeting of IL13Rα2 and EGFRvIII could be a promising strategy for GBM CAR therapy. One study has reported on the administration of IL13Rα2 CAR T cells intracranially post resection, followed by further infusions both intraventricular and intrathecally in a single patient [113]. Although the patient experienced disease recurrence after adoptive cell therapy, remarkable tumour shrinkage was observed in all lesions by 77–100%, exhibiting a sustained responses for 7.5 months after intrathecal administration.

3.3. Co-Stimulator B7H3

B7H3 (CD276) is a costimulatory protein on the cell surface, where the B7 superfamily of proteins was initially thought to be solely involved in immune co-stimulation [114][115]. It has since been found to be highly expressed on GBM and tumour-associated endothelial cells, with protein levels increasing with increasing tumour grade [105][116]. Although its functional role is not fully elucidated, B7H3 is associated with poorer prognosis in GBM patients [116], making it a potential target for therapy. A recent clinical report using CAR-T cells directed towards B7H3 showed in one patient with recurrent GBM who received seven infusions significantly reduced volume of contrast enhancing lesion on MRI and clinical response for 50 days [117]. Two B7H3-directed CAR T cell clinical trials for GBM are currently in recruitment in China (clinical trial ID NCT04077866 and NCT04385173).

3.4. Multitarget Approach with NKG2D

The TAAs mentioned above are all considered feasible targets for GBM immunotherapy. However, their heterogenous expression on cancer and normal cells present challenges with toxicity, antigen escape and subsequent recurrence. One suggested approach to overcome this issue has been to use the lectin-like, type 2 transmembrane receptor NKG2D in CAR therapy. NKG2D is an activating receptor expressed on the surface of NK and CD8+ T cells [12][118][119] that binds MHC class-related chains A and B (MICA and MICB, respectively), as well as UL16-binding protein 6 (ULBP6), that are typically only expressed during hyper-proliferation and transformation [120]. NKG2D ligands are expressed by stressed and transformed cells, potentially induced as a response to chemo- and radiotherapy [39][121]. In immunocompetent mice, a recent study reported that an NKG2D-based CAR T therapy worked synergistically with radiotherapy, yielding persistence and long-term protection from disease [122]. Weiss et al. incorporated the full-length NKG2D protein fused to CD3ζ in association with DAP10, functioning similarly to a second-generation CAR, and transduced it into T cells. These promising results provide evidence for clinical translation into human trials. However, the single approved NKG2D-based CAR T clinical trial (clinical trial ID NCT04270461) has since been withdrawn due to administrative reasons.

4. Genetic Modification as an Aid to Existing Therapies

Cutting edge gene editing technologies [123] provide the opportunity to enhance the efficacy of existing molecular immunotherapy strategies. Introduction of clustered regularly interspaced short palindromic repeats (CRISPR) and the CRISPR-associated endonuclease Cas (typically Cas9) to design T or NK cells may improve the potency of cancer immunotherapy. CRISPR/Cas9 technology is used to knockout genes by inducing double-stranded DNA breaks (DSB) at specific sites within the genome. The Cas9 enzyme forms a complex with a 20-base guide RNA (gRNA) that is predesigned to recognize a complementary DNA target site in a gene of interest. Cas9 locates a protospacer adjacent motif (PAM) sequence directly downstream of the gRNA sequence, binds and triggers a DSB at the genomic target site [124] (Figure 3). The cell then repairs the damage through mechanisms based on the cell cycle stage and proliferative status [125][126]. The most common repair pathway is non-homologous end joining, wherein the two ends of the DNA are fused, often resulting in faulty repair, with random insertion or deletion of nucleotides causing frameshift mutations and thus a knockout of the gene. The other, less common pathway, homology-directed repair (HDR), uses a DNA repair template to repair the damaged DNA, or introduces a gene edit, as with HDR CRISPR [127]. HDR CRISPR, however, is difficult to accomplish and often leads to high numbers of unwanted insertions and deletions (indels) outside the genetic area of interest, so-called off-target effects [128][129].
Figure 2. Schematic representation of CRISPR/Cas9 gene editing. The DNA endonuclease Cas9 is introduced to target cells via transduction, transfection or addition of pure Cas9 protein, and complexes with the guide RNA (gRNA). This complex between Cas9 and gRNA searches for a protospacer adjacent motif (PAM) sequence in proximity to the gRNA 20-base sequence. Once bound, Cas9 causes a double-stranded DNA break, and the cell must use either non-homologous end joining or homology-directed repair to fix the break. This results in either wild type DNA, edited DNA, or insertions and deletions (indels) that result in gene knockout.
The use of CRISPR/Cas9 technology in the development of cancer therapy has only recently begun to have an impact on human trials, as the ethical use of CRISPR/Cas9 to edit the human genome has been a hotly debated topic [130][131]. CRISPR/Cas9 mutagenesis screening has been used as a tool to identify REGNASE-1 as a negative regulator of antitumour responses, whose knockout improved efficiency and persistence of effector T cells in vitro [132]. In addition, CRISPR/Cas9 was used to successfully generate CBLB knockout NK cells derived from human placental stem-cells, without altering their phenotype [133], indicating possibility for use in primary lymphocytes. Preclinical research has successfully used multiplex CRISPR/Cas9 to limit universal CAR T cell exhaustion by disrupting the PD-1 gene, as well as the endogenous TCR α chain (TRAC) and β-2 microglobulin (B2M) [70]. The T cells, directed against EGFRvIII, were administered intracerebrally in GBM bearing mice, and enhanced survival. In a recent phase I human clinical trial, CRISPR/Cas9 was used on autologous T cells to knock out the endogenous TCR α and β chains as well as PD-1 in 3 patients with refractory cancer: 2 patients with multiple myeloma, and 1 with myxoid and round cell liposarcoma [69]. In addition, a transgenic TCR was transduced into the cells, targeting the cancer testis antigen NY-ESO-1. The T cells were then heterogeneously expanded and intravenously reinfused into the patients. The engineered cells persisted in the patients for up to 9 months. Stadtmauer et al. showed that at the time of infusion, the amount of Cas9 protein had diminished to a non-detectable level in the engineered T cells, had acceptable levels of off-target editing, and that the patients did not develop humoral responses to Cas9.

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Subjects: Oncology
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Update Time: 29 Mar 2022
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    Arnesen, V.S.; Chekenya, M. Designer T and NK Cells in Glioblastoma Immunotherapy. Encyclopedia. Available online: https://encyclopedia.pub/entry/15471 (accessed on 29 June 2022).
    Arnesen VS, Chekenya M. Designer T and NK Cells in Glioblastoma Immunotherapy. Encyclopedia. Available at: https://encyclopedia.pub/entry/15471. Accessed June 29, 2022.
    Arnesen, Victoria Smith, Martha Chekenya. "Designer T and NK Cells in Glioblastoma Immunotherapy," Encyclopedia, https://encyclopedia.pub/entry/15471 (accessed June 29, 2022).
    Arnesen, V.S., & Chekenya, M. (2021, October 27). Designer T and NK Cells in Glioblastoma Immunotherapy. In Encyclopedia. https://encyclopedia.pub/entry/15471
    Arnesen, Victoria Smith and Martha Chekenya. ''Designer T and NK Cells in Glioblastoma Immunotherapy.'' Encyclopedia. Web. 27 October, 2021.
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