Biology subjects

Munk, K. K.

Publications and source records attributed to Munk, K. K..

5 recordsLinked to original sources

bioRxiv2025

Antigen-scaffolds loaded with hyper-stable Neoleukin-2/15 expand antigen-specific T cells with a favorable phenotype for adoptive cell therapy

Adoptive cell therapy (ACT) has shown promising results in cancer treatment, however, achieving effective ex vivo expansion of potent, functionally active, and cytotoxic T cells remains challenging. To overcome this, we loaded the engineered cytokine Neoleukin-2/15 (Neo2/15) on our recently established artificial antigen-presenting scaffolds (Ag-scaffolds) to expand antigen-specific T cells. Neo2/15 selectively binds to IL-2R{beta}/{gamma} receptors, enhancing CD8+ T cell proliferation while limiting regulatory T cell expansion. Our study assessed the efficacy of Neo2/15-loaded Ag-scaffolds (Ag-Neo2/15 scaffolds) in expanding antigen-specific T cells from peripheral blood mononuclear cells (PBMCs) of healthy donors. We optimized Ag-scaffold configurations by varying the number of Neo2/15 molecules loaded on Ag-scaffolds and evaluated their impact on T-cell expansion and functionality. We showed that Ag-Neo2/15 scaffolds promoted significant T-cell expansion, with a comparable frequency of antigen-specific CD8+ T cells compared to IL-2/IL-21-loaded Ag-scaffolds (Ag-IL2/21 scaffolds). The CD8+ T cells expanded with Ag-Neo2/15 scaffolds exhibited potent TNF and IFN{gamma} production and expressed high levels of 4{beta}7 integrin, a homing molecule which is important for directing T cells to specific tissues, potentially enhancing their therapeutic potential. T cells expanded with Ag-Neo2/15 scaffolds had superior and durable cytotoxicity against tumor target cells compared to T cells expanded with Ag-IL2/21 scaffolds. These findings were further supported by our single-cell analysis revealing that T cells expanded with Ag-Neo2/15 scaffolds had higher cytotoxic scores and lower dysfunctionality scores compared to T cells expanded with Ag-IL2/21 scaffolds. The single-cell analysis also indicated increased expression of genes linked to cell division and enhanced proliferative capacity in Ag-Neo2/15 expanded T cells. Furthermore, TCR clonality analysis demonstrated that Ag-Neo2/15 scaffolds promoted the expansion of functionally superior T-cell clones. The top clones of CD8+ T cells expanded with Ag-Neo2/15 scaffolds exhibited a favorable phenotype, essential for effective antigen recognition and sustained T-cell mediated cytotoxicity. Our findings suggest that Ag-Neo2/15 scaffolds represent an advancement in ACT by producing high-quality, functional antigen-specific T cells. This method has the potential to improve clinical outcomes in cancer therapy by generating large numbers of highly functional T cells, thereby optimizing the balance between cytotoxicity and proliferation capacity with less exhausted T-cells in expansion protocols.

immunology↗

bioRxiv2025

Dextran-based T-cell expansion nanoparticles for manufacturing CAR T cells with augmented efficacy

Adoptive T cell therapy (ACT) using chimeric antigen receptor (CAR) engineered T cells is currently being explored in multiple cancer types beyond leukemia/lymphoma. A key step in CAR-T cell manufacturing is the activation and expansion of T cells, which facilitates viral transduction, however, may hamper T cell fitness and reduce in vivo persistence. We developed "T-Expand" for T cell activation and expansion, comprising dextran-based nanoparticles (NPs) conjugated with anti-CD3 and anti-CD28 antibodies. The NPs triggered robust polyclonal expansion of human T cells with efficiency in the range of commercial microbeads (Dynabeads). Engineered in presence of T-Expand, CD19 CAR T cells exhibited enhanced proliferative capacity, cytotoxicity and persistence in vitro, and furthermore, showed superior anti-lymphoma activity in mouse models resulting in complete tumor clearance at one fourth of the CAR T cell dose. Importantly, T-Expand is biocompatible with no observed toxicity, circumventing removal steps after T cell expansion compared to DynabeadsTM. As a biocompatible T cell expansion platform, T-Expand simplifies the manufacturing process while enhancing T cell persistence and functionality, thereby holding promise for increasing clinical efficacy of CAR T cell therapy. O_FIG O_LINKSMALLFIG WIDTH=165 HEIGHT=200 SRC="FIGDIR/small/648181v1_ufig1.gif" ALT="Figure 1"> View larger version (74K): org.highwire.dtl.DTLVardef@35337corg.highwire.dtl.DTLVardef@c75199org.highwire.dtl.DTLVardef@1be184forg.highwire.dtl.DTLVardef@12e1683_HPS_FORMAT_FIGEXP M_FIG Graphical abstract/Cover figureIllustration of CAR T cell manufacturing using T-Expands ex vivo. C_FIG

immunology↗

bioRxiv2025

Comprehensive longitudinal profiling of SARS-CoV-2-specific CD8+ T-cells reveal strong functional impairment and recognition bias as markers for disease severity

CD8+ T-cells are essential for controlling and resolving SARS-CoV-2 infection, yet their antigen-specific resolution in relation to disease severity, functional dynamics during acute infection, and long-term memory formation remain incompletely understood. Using comprehensive longitudinal profiling of 553 SARS-CoV-2 immunogenic antigens across globally prevalent HLAs, we identified antigen-specific CD8+ T-cell responses that were either critical for early viral clearance or associated with severe disease outcomes. During acute infection, patients with severe COVID-19 exhibited a broader and more robust CD8+ T-cell response than those with mild disease. Notably, we identified HLA-A1-restricted immunodominant antigen-specific T-cells strongly associated with severe disease. These T-cells were present at extremely high frequencies but showed significantly reduced expression of cytotoxic molecules at both the transcriptomic (PRF1, GZMB, GZMH, GNLY) and protein levels (IFN-{gamma}, TNF-, IL-2), as revealed by multidimensional single-cell and cytokine profiling. In contrast, patients with mild disease had T-cells that recognized a more restricted set of antigens, showed only partial overlap with those in severe cases, and showed enhanced cytotoxicity, along with enrichment in gene sets associated with cytotoxic function, hypoxia, and glycolysis. Furthermore, the long-term memory CD8+ T-cells were maintained for a limited subset of immunodominant antigens, with their persistence correlating with their initial frequency during infection. Importantly, SARS-CoV-2 vaccination following infection expanded the long-term T-cell repertoire by enhancing pre-existing responses and generating de novo responses, regardless of prior disease severity. These findings resolve the antigen-specific kinetics and durability of CD8+ T-cells in SARS-CoV-2 infection and provide key insights into their functional landscape. This knowledge could inform future vaccine strategies and therapeutic interventions to enhance protective immunity against emerging viral threats.

immunology↗

bioRxiv2024

De novo designed pMHC binders facilitate T cell induced killing of cancer cells

The recognition of intracellular antigens by CD8+ T cells through T-cell receptors (TCRs) is central to adaptive immunity, enabling responses against infections and cancer. The recent approval of TCR-gene-edited T cells for cancer therapy demonstrates the therapeutic advantage of using pMHC recognition to eliminate cancer. However, identification and selection of TCRs from patient material is complex and influenced by the TCR repertoire of the donors used. To overcome these limitations, we here present a rapid and robust de novo binder design platform leveraging state-of-the-art generative models, including RFdiffusion, ProteinMPNN, and AlphaFold2, to engineer minibinders (miBds) targeting the cancer-associated pMHC complex, NY-ESO-1(157-165)/HLA-A*02:01. By incorporating in silico cross-panning and molecular dynamics simulations, we enhanced specificity screening to minimise off-target interactions. We identified a miBd that exhibited high specificity for the NY-ESO-1-derived peptide SLLMWITQC in complex with HLA-A*02:01 and minimal cross-reactivity in mammalian display assays. We further demonstrate the therapeutic potential of this miBd by integrating it into a chimeric antigen receptor, as de novo Binders for Immune-mediated Killing Engagers (BIKEs). BIKE-transduced T cells selectively and effectively killed NY-ESO-1+ melanoma cells compared to non-transduced controls, demonstrating the promise of this approach in precision cancer immunotherapy. Our findings underscore the transformative potential of generative protein design for accelerating the discovery of high-specificity pMHC-targeting therapeutics. Beyond CAR-T applications, our workflow establishes a foundation for developing miBds as versatile tools, heralding a new era of precision immunotherapy.

immunology↗

bioRxiv2022

Three-doses of BNT162b2 COVID-19 mRNA vaccine establishes long-lasting CD8+ T cell immunity in CLL and MDS patients

Patients with hematological malignancies are prioritized for COVID-19 vaccine due to their high risk for severe SARS-CoV-2 infection related disease and mortality. To understand T cell immunity, its long-term persistence, and correlation with antibody response, we evaluated the BNT162b2 COVID-19 mRNA vaccine-specific immune response in chronic lymphocytic leukemia (CLL) and myeloid dysplastic syndrome (MDS) patients. Longitudinal analysis of CD8+ T cells using DNA-barcoded peptide-MHC multimers covering the full SARS-CoV-2 Spike-protein (415 peptides) showed vaccine-specific T cell activation and persistence of memory T cells up to six months post-vaccination. Surprisingly, a higher frequency of vaccine-induced antigen-specific CD8+ T cell was observed in the patient group compared to a healthy donor group. Furthermore, and importantly, immunization with the second booster dose significantly increased the frequency of antigen-specific CD8+ T cells as well as the total number of T cell specificities. Altogether 59 BNT162b2 vaccine-derived immunogenic epitopes were identified, of which 23 established long-term CD8+ T cell memory response with a strong immunodominance for NYNYLYRLF (HLA-A24:02) and YLQPRTFLL (HLA-A02:01) epitopes. In summary, we mapped the vaccine-induced antigen-specific CD8+ T cells and showed a booster-specific activation and enrichment of memory T cells that could be important for long-term disease protection in this patient group. Key PointsO_LICOVID-19 mRNA vaccine induced an early and persistent activation of antigen-specific CD8+ T cells in this patient group. C_LIO_LIVaccination with a booster dose is required to maintain vaccine-specific CD8+ T cells. C_LI

immunology↗