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CyTOF Analysis Reveals a Distinct Immunosuppressive Microenvironment in IDH Mutant Anaplastic Gliomas
Weilun Fu1,2, Wenjing Wang3,4, Hao Li1,2
1Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, Beijing, China.
Frontiers in Oncology
|February 22, 2021
Summary
This study reveals the complex immune microenvironment in anaplastic glioma (AG). IDH-mutant anaplastic astrocytoma (AAmut) and anaplastic oligodendroglioma (AOD) tumors exhibit distinct immunosuppressive characteristics, impacting prognosis.
Area of Science:
- Neuro-oncology
- Immunology
- Cancer Biology
Background:
- The immune microenvironment significantly influences anaplastic glioma (AG) development, progression, and prognosis.
- A comprehensive understanding of the AG immune landscape requires high-dimensional analysis.
- Previous studies have not fully elucidated the intricate immune cell interactions within AG tumors.
Purpose of the Study:
- To characterize the immune cell composition and function within the tumor microenvironment of IDH-mutant anaplastic astrocytoma (AAmut) and IDH-mutant, 1p/19q-codeleted anaplastic oligodendroglioma (AOD).
- To compare the immune profiles of AG tumors with paired peripheral blood mononuclear cells (PBMCs).
- To identify tumor-driven immune alterations and differences between AAmut and AOD immune milieus.
Main Methods:
- Mass cytometry (CyTOF) was employed to analyze immune cells from AG tumor samples and paired PBMCs.
- A panel of 33 biomarkers was utilized for high-dimensional immune cell profiling.
- Comparative analysis was performed on samples from 5 AAmut patients and 10 AOD patients.
Main Results:
- Mononuclear phagocytes and T cells were identified as the predominant immune cell populations in the AG tumor microenvironment.
- Glioma-associated microglia/macrophages in both AAmut and AOD displayed significant immunosuppressive properties.
- Elevated ratios of exhausted CD4+ and CD8+ T cells expressing immune checkpoints were observed in AG tumors compared to PBMCs.
- The immune microenvironment of AAmut tumors demonstrated more pronounced immunosuppressive characteristics than that of AOD tumors.
Conclusions:
- The study elucidates key tumor-driven immune changes in the anaplastic glioma microenvironment.
- Both AAmut and AOD exhibit immunosuppressive features mediated by myeloid cells and exhausted T cells.
- Distinct differences in immune suppression exist between AAmut and AOD, potentially influencing therapeutic strategies.
Keywords:
CyTOF/mass cytometryanaplastic astrocytomaanaplastic oligodendrogliomagliomaimmune profilingmicroenvironment
