cultivating-ex-vivo-patient-derived-glioma-organoids-using-tissue

Cultivating Ex Vivo Patient-Derived Glioma Organoids Using a Tissue Chopper

Glioblastoma, IDH-wild type, CNS WHO grade 4 (GBM) is a primary brain tumor associated with poor patient survival despite aggressive treatment. Developing ...

University Hospital Würzburg

Increasing evidence suggests that human NK cells may develop memory-like features. Here, we report the establishment of a robust 8-color flow cytometry panel that allows quantification and functional analysis of different memory-like NK cell subsets (NKG2C/CD57, FcεRγ) from relatively small blood samples. We could confirm previous publications reporting an enhanced prevalence of the mentioned memory-like NK cell subsets in CMV seropositive human donors and were able to show a clear congruence between enhanced expression of NKG2C and CD57, the absence of FcεRγ and CMV seropositivity supporting the hypothesis of memory-like NK cell development following viral infections. While we could not detect significant differences in effector functions (i.e. degranulation and production of IFNγ) in regard to age or CMV seropositivity when looking at the overall NK cell population, a significantly enhanced expression of CD107a and IFNγ could be observed in NKG2C/CD57 as well as FcεRγ NK cell subpopulations in CMV donors. This enhancement of effector functions was even more pronounced in NKG2C/CD57 NK cells that were also negative for FcεRγ; CMV seropositive donors showed a dramatically increased expression of CD107a as well as IFNγ. With only small-sized volumes of blood needed, our proposed 8-color panel and experimental protocol offers easy handling and a reliable and reproducible option for implementation in accompanying clinical research, e.g. for evaluation of immunosuppressed patients suffering from autoimmune diseases or in allograft recipients.

Robust 8-color flow cytometry panel reveals enhanced effector function of NKG2C CD57 FcεRγ NK cells in CMV seropositive human blood donors.

While glioblastoma (GBM) is still challenging to treat, novel immunotherapeutic approaches have shown promising effects in preclinical settings. However, their clinical breakthrough is hampered by complex interactions of GBM with the tumor microenvironment (TME). Here, we present an analysis of TME composition in a patient-derived organoid model (PDO) as well as in organotypic slice cultures (OSC). To obtain a more realistic model for immunotherapeutic testing, we introduce an enhanced PDO model. We manufactured PDOs and OSCs from fresh tissue of GBM patients and analyzed the TME. Enhanced PDOs (ePDOs) were obtained via co-culture with PBMCs (peripheral blood mononuclear cells) and compared to normal PDOs (nPDOs) and PT (primary tissue). At first, we showed that TME was not sustained in PDOs after a short time of culture. In contrast, TME was largely maintained in OSCs. Unfortunately, OSCs can only be cultured for up to 9 days. Thus, we enhanced the TME in PDOs by co-culturing PDOs and PBMCs from healthy donors. These cellular TME patterns could be preserved until day 21. The ePDO approach could mirror the interaction of GBM, TME and immunotherapeutic agents and may consequently represent a realistic model for individual immunotherapeutic drug testing in the future.

Article	Year
Robust 8-color flow cytometry panel reveals enhanced effector function of NKG2C CD57 FcεRγ NK cells in CMV seropositive human blood donors. Immunobiology\| PubMed ID: 28139257	2017
Characterization and Optimization of the Tumor Microenvironment in Patient-Derived Organotypic Slices and Organoid Models of Glioblastoma. Cancers\| PubMed ID: 37345035	2023

Thomas Nerreter

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