IL15 Deficiency in Rats
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA893659 | ENA |
REPOSITORIES: ENA
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Project description:Half of the patients with high-risk neuroblastoma (NB) who receive GD2-targeted monoclonal antibody do not achieve long-term remissions. Recently, the antibody hu14.18 has been linked to interleukin (IL)2 (hu14.18-IL2) to enhance its efficacy and shown promising preclinical and clinical activity. We developed two new immunocytokines (ICs) by linking two other γc cytokines, IL15 and IL21, to hu14.18. The purpose of this study was to compare hu14.18-IL15 and -IL21 to hu14.18-IL2 in their ability to induce antibody-dependent cell-mediated cytotoxicity (ADCC) against NB. We assessed ADCC of hu14.18-IL15 and -IL2 (human cytokines, cross-reactive to mouse) against GD2low and GD2high NB cell lines in vitro. T-cell deficient mice with orthotopic patient-derived xenografts (PDXs) and immunocompetent mice with transplantable orthotopic NB were used to test all three ICs, including hu14.18-IL21 (murine IL21, not cross-reactive to human). Mechanistic studies were performed using single-cell RNA-sequencing (scRNA-seq). Hu14.18-IL15 and hu14.18-IL2 mediated equivalent in vitro ADCC by human NK cells. When combined with chemotherapy, all three ICs similarly controlled the growth of PDXs in nude mice with murine NK effector cells. However, hu14.18-IL15 and -IL21 outperformed hu14.18-IL2 in immunocompetent mice with syngeneic NB, inducing complete tumor regressions and extending survival. scRNA-seq data revealed an increase in CD8+ T cells and M1 tumor-associated macrophages and decreased regulatory T cells and myeloid-derived suppressor cells in the tumor microenvironment. Hu14.18-IL15 and Hu14.18-IL21 exhibit robust preclinical activity, warranting further consideration for clinical testing in patients with GD2-expressing NB.
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