Proteins of the cancer cell secretome induce the protumoral microenvironment of diffuse intrinsic pontine glioma
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View abstract on PubMed
Summary
This summary is machine-generated.Diffuse intrinsic pontine glioma (DIPG) cells secrete proteins that promote an immunosuppressed tumor microenvironment. Key proteins like osteopontin and CHI3L1 drive these immunosuppressive changes, impacting immune cells and the tumor niche.
Area Of Science
- Neuro-oncology
- Immunology
- Cancer Biology
Background
- Diffuse intrinsic pontine glioma (DIPG) microenvironment typically lacks infiltrating lymphocytes and immune checkpoints, except for B7-H3.
- The role of the cancer secretome in establishing this immune-suppressed tumor phenotype requires investigation.
Purpose Of The Study
- To investigate whether the cancer secretome determines the immune-suppressed phenotype of diffuse intrinsic pontine glioma (DIPG).
- To identify key secreted proteins responsible for shaping the DIPG tumor microenvironment.
Main Methods
- Quantification of immune markers and cytokines in DIPG tissues, cerebrospinal fluid (CSF), and plasma.
- Analysis of DIPG culture supernatants and their effects on mesenchymal cells, endothelial cells, and macrophages in vitro.
- Histological analysis of DIPG samples and healthy brainstem controls.
Main Results
- DIPG brains showed increased infiltration of CD163+ microglia/macrophages compared to controls.
- Osteopontin and chitinase-3-like 1 (CHI3L1) were identified as key overexpressed proteins in DIPG secretomes, significantly elevated in CSF.
- DIPG secretomes, osteopontin, and CHI3L1 induced phenotypic changes in mesenchymal cells (B7-H3+ pericyte-like), endothelial cells (BCRP+), and macrophages (M2-like polarization).
Conclusions
- DIPG cells actively secrete proteins that establish an immunosuppressed tumor microenvironment.
- Osteopontin and CHI3L1 are critical components of the DIPG secretome contributing to immune evasion and tumor progression.
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