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Published on: October 20, 2016
P4HA1 Down-Regulation Inhibits Glioma Invasiveness by Promoting M1 Microglia Polarization
Qiyan Wang1, Junwen Zhang1, Sheng Fang1
1Brain Tumor Research Center, Beijing Neurosurgical Institute, Beijing Laboratory of Biomedical Materials, Beijing Tiantan Hospital Affiliated to Capital Medical University, Beijing, 10070, People's Republic of China.
Background:
Polarization of microglia cells in the glioma microenvironment is closely related to the malignant progression and invasion of gliomas. Prolyl 4-hydroxylase subunit α1 (P4HA1) is the rate-limiting subunit of prolyl 4-hydroxylase (P4H). In previous studies, we showed that P4HA1 could promote the proliferation, migration, and invasion of glioma cells, but the specific mechanisms through which this occurs have not been fully elucidated.
Materials And Methods:
Interactions between glioma and microglia cells were analyzed using bioinformatics. Then, co-culture models were used to obtain conditioned media. To characterize microglial cell polarization, we used PCR and immunofluorescence. Proliferation and invasion assays were used to explore the biological behavior of glioma cells affected by microglia. Finally, marker expression was detected using immunohistochemistry in glioblastoma multiform (GBM) specimens.
Results:
Knockdown of P4HA1 resulted in reduced chemotaxis of microglia toward GBM cells and increased polarization of microglia toward the M1 phenotype. The changed microglial polarization state, in turn, inhibited the proliferation and invasion of GBM cells. Moreover, in GBM tissue specimens, the P4HA1 expression level is negatively correlated with that of the CD86 microglia M1-specific marker.
Conclusion:
Our results show that P4HA1 promotes immunosuppressive microenvironment formation by cross-talk between GBM and microglia cells and indirectly increases the aggressiveness of GBM.
Insights
Prolyl 4-hydroxylase subunit α1 (P4HA1) in glioma promotes an immunosuppressive environment by influencing microglia polarization. Inhibiting P4HA1 reduces glioma aggressiveness and invasion.
Area of Science:
- Neuro-oncology
- Immunology
- Molecular Biology
Background:
- Microglial cell polarization is critical in the glioma microenvironment, influencing tumor progression and invasion.
- Prolyl 4-hydroxylase subunit α1 (P4HA1) is implicated in glioma cell proliferation, migration, and invasion, but its precise role remains unclear.
Purpose of the Study:
- To elucidate the mechanism by which P4HA1 influences glioma progression through its interaction with microglia.
- To investigate the role of P4HA1 in modulating microglial polarization and its subsequent impact on glioma aggressiveness.
Main Methods:
- Bioinformatic analysis of glioma-microglia interactions.
- Co-culture models to obtain conditioned media.
- Assessment of microglial polarization using PCR and immunofluorescence.
- Proliferation and invasion assays for glioma cells.
- Immunohistochemical analysis of P4HA1 and CD86 expression in glioblastoma multiforme (GBM) specimens.
Main Results:
- P4HA1 knockdown reduced microglial chemotaxis towards GBM cells and promoted M1 polarization.
- Altered microglial polarization inhibited GBM cell proliferation and invasion.
- P4HA1 expression negatively correlated with CD86 (M1 marker) in GBM tissues.
Conclusions:
- P4HA1 facilitates the formation of an immunosuppressive microenvironment via glioma-microglia cross-talk.
- P4HA1 indirectly enhances GBM aggressiveness by modulating the tumor microenvironment.
