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Flow Cytometry Analyses of Meningioma Immune Cell Composition Using a Short, Optimized Digestion Protocol
Malmö University, Faculty of Health and Society (HS), Department of Biomedical Science (BMV). Department of Neurosurgery, Copenhagen University Hospital-Rigshospitalet, 2100 Copenhagen, Denmark.
Department of Neurosurgery, Copenhagen University Hospital-Rigshospitalet, 2100 Copenhagen, Denmark.
Department of Neurosurgery, Copenhagen University Hospital-Rigshospitalet, 2100 Copenhagen, Denmark.
Department of Neurosurgery, Copenhagen University Hospital-Rigshospitalet, 2100 Copenhagen, Denmark.
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2024 (English)In: Cancers, ISSN 2072-6694, Vol. 16, no 23, article id 3942Article in journal (Refereed) Published
Abstract [en]

BACKGROUND: Current challenges in meningioma treatment, including post-surgical complications and cognitive impairments, highlight the need for new treatment alternatives. Immunological interventions have shown promise. However, there is a knowledge gap in characterizing infiltrating immune cells in meningioma and their interplay. Further studies on immune cells in single-cell suspensions from digested meningioma tissues could identify targetable mechanisms for non-surgical treatment options with fewer side effects. This study aimed to optimize a protocol for faster digestion of meningioma tissues into viable single-cell suspensions and to identify infiltrating immune cell populations.

METHODS: We modified a commercial kit intended for whole skin dissociation to digest resected meningioma tissues into viable single-cell suspensions. Tumor-infiltrating immune cell populations were characterized using flow cytometry.

RESULTS: , with a small proportion co-expressing CD83. Women were more likely to have a lower proportion of immune cells, B cells, and NK cells. Female patients with a high proportion of immune cells had a higher proportion of macrophages.

CONCLUSION: We successfully optimized a protocol for generating single-cell suspensions with viable immune cells from meningioma tissues, revealing infiltrating antigen-presenting cells with an immunosuppressive phenotype, and lymphocytes. This short protocol allows advanced analyses of tumor-infiltrating cells using techniques such as single-cell RNA sequencing and flow cytometry, which require live, dissociated cells.

Place, publisher, year, edition, pages
MDPI, 2024. Vol. 16, no 23, article id 3942
Keywords [en]
T cells, TIM-3, brain tumor, immune cells, lymphocytes, macrophages, meningioma, single-cell suspension, tumor digestion, tumor-infiltrating cells
National Category
Cancer and Oncology
Identifiers
URN: urn:nbn:se:mau:diva-72847DOI: 10.3390/cancers16233942ISI: 001376117400001PubMedID: 39682129Scopus ID: 2-s2.0-85211949815OAI: oai:DiVA.org:mau-72847DiVA, id: diva2:1923027
Available from: 2024-12-20 Created: 2024-12-20 Last updated: 2025-01-28Bibliographically approved
In thesis
1. Immune tolerance: induction and disruption for therapeutic immune modulation
Open this publication in new window or tab >>Immune tolerance: induction and disruption for therapeutic immune modulation
2025 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This study investigated the tolerance induction and disruption of immune tolerance as strategies for immune modulation.

For induction of immune tolerance, novel monocyte-derived tolerogenic dendritic cells (ItolDCs) were generated, and their ability to modulate the immune system was assessed using in vitro assays in hemophilia A patients who had developed neutralizing antibodies against their factor VIII replacement therapy. The cells were characterized, their functionality was assessed, and their feasibility as a safe cell therapy was further evaluated using both in vitro and in vivo studies for the induction of immune tolerance against factor VIII.

For research on disruption of immune tolerance, meningioma, the most common brain tumor, was studied. To map the immune cell composition in meningiomas, a protocol was optimized for shorter enzymatic digestion, which breaks down the tissue into single-cell suspensions of viable immune cells. Since CD8+ T cells are vital in tumor suppression, further studies were conducted to explore their characteristics and identify possible targetable processes for immunotherapy.

To investigate both induction and disruption of immune tolerance, various techniques were employed, including flow cytometry, immunohistochemistry, and functional-cell-based assays.

Our investigation demonstrated that ItolDCs are a feasible and safe option for cell therapy aimed at inducing immune tolerance. Thus, factor VIII-loaded ItolDCs are ready for clinical evaluation to reduce inhibitor levels in patients with hemophilia A.

Several tolerance-associated markers (PD-1, TIM-3, TIGIT, and LAG-3) were identified in CD8+ T cells in meningioma. These findings highlight how tumor cells may evade immune defenses and suggest potential immunotherapeutic targets, including immune checkpoint inhibitors.

Taken together, various approaches may be employed for immune modulations to either induce or disrupt immune tolerance.

Place, publisher, year, edition, pages
Malmö: Malmö University Press, 2025. p. 92
Series
Malmö University Health and Society Dissertations, ISSN 1653-5383, E-ISSN 2004-9277 ; 2025:2
National Category
Biomedical Laboratory Science/Technology
Identifiers
urn:nbn:se:mau:diva-73379 (URN)10.24834/isbn.9789178775873 (DOI)978-91-7877-586-6 (ISBN)978-91-7877-587-3 (ISBN)
Public defence
2025-02-21, Allmänna sjukhuset, aulan (AS:E002), Malmö, 09:15 (English)
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Note

Paper II and IV in dissertation as manuscript. Not included in the fulltext online.

Available from: 2025-01-28 Created: 2025-01-28 Last updated: 2025-01-30Bibliographically approved

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Dao Nyesiga, GillianOhlsson, Lars

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