Abstract
Current conventional treatment strategies for glioblastoma (GBM) have limited efficacy due to the rapid development of resistance to temozolomide (TMZ). It is particularly urgent to develop novel therapeutic strategies that can overcome TMZ resistance and provide patients with better prognoses. Here, a TMZ-resistant GBM cell strain and a mouse model of TMZ resistance are established as valuable tools to explore novel therapeutic strategies against TMZ resistance. Experimentally, p38MAPK inhibitor reduces the accumulation of F4/80+/CD11b+ macrophages/microglia in glioma and prolongs the survivals of glioma-bearing mice. Glioma-associated macrophages/microglia have a significanct expression of PD-L1. p38MAPK inhibitor in combination with PD-L1 antibody can effectively prolongs the survivals of TMZ-resistant GBM-bearing hosts, and differentially reduces the accumulation of circulating monocytes-derived tumor-associated macrophages and PD-L1 abundances of resident glioma-associated microglia. This combination therapy could be a treatment option for patients at the recurrence or chronic TMZ maintenance stages. A clinical study to confirm the safety and effectiveness of this combination therapy is warranted.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Grant numbers: 81372273 and 81773145 to Xia Zhang).
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Conceptualization: XZ; methodology: WD, JX, QM, JM, YS and XL; resources: MC, LC, XL, XZ and XB; writing of original draft: WD, XZ; manuscript review and editing: YS, XY, SY, XL, YC and XZ; supervision: XZ, XB.
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Dang, W., Xiao, J., Ma, Q. et al. Combination of p38 MAPK inhibitor with PD-L1 antibody effectively prolongs survivals of temozolomide-resistant glioma-bearing mice via reduction of infiltrating glioma-associated macrophages and PD-L1 expression on resident glioma-associated microglia. Brain Tumor Pathol 38, 189–200 (2021). https://doi.org/10.1007/s10014-021-00404-3
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DOI: https://doi.org/10.1007/s10014-021-00404-3