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O-Vanillin Attenuates the TLR2 Mediated Tumor-Promoting Phenotype of Microglia
Paul Triller1, Julia Bachorz1, Michael Synowitz2
1Max Delbrueck Center for Molecular Medicine in the Helmholtz Association, Robert-Rössle-Str 10, 13125 Berlin, Germany.
Abstract:
Malignant gliomas are primary brain tumors with poor prognoses. These tumors are infiltrated by brain intrinsic microglia and peripheral monocytes which promote glioma cell invasion. In our previous studies, we discovered that the activation of Toll-like receptor 2 (TLR2) on microglia/brain macrophages converts them into a protumorigenic phenotype through the induction of matrix metalloproteinases (MMP) 9 and 14. In the present study, we used in vitro and in situ microglia-glioma interaction experimental models to test the impact of a novel inhibitor of TLR 2, ortho vanillin (O-Vanillin) to block TLR2 mediated microglia protumorigenic phenotype. We demonstrate that O-Vanillin inhibits the TLR2 mediated upregulation of MMP 9, MMP 14, IL 6 and iNOS expression. Similarly, the glioma supernatant induced MMP 9 and MMP 14 expression in murine and human microglia is abrogated by O-Vanillin treatment. O-Vanillin is not toxic for microglia, astrocytes or oligodendrocytes. Glioma growth in murine brain slice cultures is significantly reduced after treatment with O-Vanillin, and this reduced glioma growth depends on the presence of microglia. In addition, we also found that O-Vanillin inhibited the glioma induced proliferation of murine primary microglia. In summary, O-Vanillin attenuates the pro-tumorigenic phenotype of microglia/brain macrophages and thus qualifies as a candidate for glioma therapy.
Insights
Ortho vanillin (O-Vanillin) inhibits Toll-like receptor 2 (TLR2) activation in microglia, reducing glioma cell invasion. This novel compound shows promise as a potential therapy for malignant gliomas by targeting the tumor microenvironment.
Area of Science:
- Neuro-oncology
- Immunology
- Pharmacology
Background:
- Malignant gliomas are aggressive brain tumors with poor outcomes.
- Microglia and monocytes within the tumor microenvironment promote glioma invasion.
- Toll-like receptor 2 (TLR2) activation on microglia induces a pro-tumorigenic phenotype via matrix metalloproteinases (MMP).
Purpose of the Study:
- To investigate the efficacy of ortho vanillin (O-Vanillin), a novel TLR2 inhibitor, in blocking TLR2-mediated microglia activation.
- To assess the impact of O-Vanillin on microglia-glioma interactions and glioma progression in vitro and in situ.
Main Methods:
- Utilized in vitro and in situ microglia-glioma co-culture models.
- Assessed the expression of MMP-9, MMP-14, IL-6, and iNOS following O-Vanillin treatment.
- Evaluated O-Vanillin's toxicity on brain cells (microglia, astrocytes, oligodendrocytes).
- Quantified glioma growth in murine brain slice cultures and microglia proliferation.
Main Results:
- O-Vanillin significantly inhibited TLR2-induced upregulation of MMP-9, MMP-14, IL-6, and iNOS.
- Glioma supernatant-induced MMP-9 and MMP-14 expression in microglia was abrogated by O-Vanillin.
- O-Vanillin demonstrated no toxicity to microglia, astrocytes, or oligodendrocytes.
- O-Vanillin treatment significantly reduced glioma growth in brain slice cultures, dependent on microglia presence.
- O-Vanillin inhibited glioma-induced microglia proliferation.
Conclusions:
- O-Vanillin effectively attenuates the pro-tumorigenic phenotype of microglia/brain macrophages.
- O-Vanillin demonstrates therapeutic potential for malignant glioma by modulating the tumor microenvironment.
- Further investigation of O-Vanillin as a glioma therapy is warranted.
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