Abstract
Background
Tumor-associated macrophages (TAM)s are critical regulators of glioma progression. As yet, however, TAMs in isocitrate dehydrogenase (IDH) mutated lower-grade gliomas (LGGs) have not been thoroughly investigated. The aim of this study was to determine whether 1p/19q co-deletion status affects the TAM phenotype or its prevalence in IDH mutated LGGs.
Methods
TAMs in IDH mutated LGGs were analyzed using transcriptome data from 230 samples in the TCGA database in combination with transcriptome data from single-cell RNA sequencing of IDH-mutated LGGs. Proteins potentially involved in TAM regulation were examined by immuno-staining in primary LGG samples harboring IDH mutations. Essential signaling pathways regulating TAM phenotypes were investigated in a glioma mouse model using small molecule inhibitors.
Results
Most of the TAMs in IDH-mutated LGGs expressed the M1 activation markers CD86 and TNF, whereas a subset of individual TAMs co-expressed both M1 and M2-related markers. Bioinformatics analysis in combination with immuno-staining of IDH-mutated patient samples revealed higher amounts of TAMs expressing M2-related markers in 1p/19q non-codeletion IDH-mutated LGGs compared to 1p/19q codeletion LGGs. The levels of transforming growth factor beta 1 (TGFβ1) and macrophage colony-stimulating factor (M-CSF) were significantly higher in 1p/19q non-codeletion LGGs than in 1p/19q codeletion LGGs. M-CSF and TGFβ1 signal inhibition decreased tumor growth and modulated the TAM phenotype in a glioma mouse model.
Conclusions
Our data indicate that 1p/19q co-deletion status relates to distinct TAM infiltration in gliomas, which is likely mediated by M-CSF and TGFβ1 signaling. M-CSF and TGFβ1 signaling may play a pivotal role in regulating the TAM phenotype in glioma.
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Abbreviations
- 1p/19q:
-
Chromosome 1p and chromosome 19q
- IDH:
-
Isocitrate dehydrogenase
- LGG:
-
Lower-grade glioma
- M-CSF:
-
Macrophage colony-stimulating factor
- scRNA-seq:
-
single cell RNA-sequencing
- TAM:
-
Tumor-associated macrophage
- TGFβ1:
-
Transforming growth factor beta 1
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Acknowledgements
The authors would like to thank the Biobank in Tangdu Hospital of the Airforce Military Medical University (**’an, China) for providing patient material, and the Core Facility of Life Science in Shaanxi Normal University for technical support.
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The analyzed datasets generated during the study are available from the corresponding author upon reasonable request.
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This work was supported by the National Natural Science Foundation of China (No. 81702489, 81911530166, 81772661, 81402081, 81870978), the “1000 Young Scholars” Program of Shaanxi Province, the National Key R&D Program of China (Grant No. 2018YFC1313003), the Natural Science Foundation of Shaanxi Province (No. 2020JQ-429), Fundamental Research Funds for the Central University (No. GK202003050, GK202003048, GK201603110), the Innovation Training Program for University Students (No. cx2019013, s201910718084) and the Natural Science Foundation of Huaihua city (2020R3118, 2020R3116).
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YZ, YX and LH designed and performed research, collected, analyzed and interpreted data and wrote the manuscript; JT and LC performed research, collected, analyzed and interpreted data and wrote the manuscript; QH and QC performed research and interpreted data; KH performed research; WG and AD interpreted data; LW and LZ designed research, analyzed and interpreted data, wrote the manuscript and supervised the study.
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Zhang, Y., **e, Y., He, L. et al. 1p/19q co-deletion status is associated with distinct tumor-associated macrophage infiltration in IDH mutated lower-grade gliomas. Cell Oncol. 44, 193–204 (2021). https://doi.org/10.1007/s13402-020-00561-1
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DOI: https://doi.org/10.1007/s13402-020-00561-1