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A proangiogenic signaling axis in myeloid cells promotes malignant progression of glioma.

ABSTRACT: Tumors are capable of coopting hematopoietic cells to create a suitable microenvironment to support malignant growth. Here, we have demonstrated that upregulation of kinase insert domain receptor (KDR), also known as VEGFR2, in a myeloid cell sublineage is necessary for malignant progression of gliomas in transgenic murine models and is associated with high-grade tumors in patients. KDR expression increased in myeloid cells as myeloid-derived suppressor cells (MDSCs) accumulated, which was associated with the transformation and progression of low-grade fibrillary astrocytoma to high-grade anaplastic gliomas. KDR deficiency in murine BM-derived cells (BMDCs) suppressed the differentiation of myeloid lineages and reduced granulocytic/monocytic populations. The depletion of myeloid-derived KDR compromised its proangiogenic function, which inhibited the angiogenic switch necessary for malignant progression of low-grade to high-grade tumors. We also identified inhibitor of DNA binding protein 2 (ID2) as a key upstream regulator of KDR activation during myeloid differentiation. Deficiency of ID2 in BMDCs led to downregulation of KDR, suppression of proangiogenic myeloid cells, and prevention of low-grade to high-grade transition. Tumor-secreted TGF-? and granulocyte-macrophage CSF (GM-CSF) enhanced the KDR/ID2 signaling axis in BMDCs. Our results suggest that modulation of KDR/ID2 signaling may restrict tumor-associated myeloid cells and could potentially be a therapeutic strategy for preventing transformation of premalignant gliomas.

SUBMITTER: Huang Y

PROVIDER: S-EPMC5409793 | biostudies-literature | 2017 May

REPOSITORIES: biostudies-literature

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A proangiogenic signaling axis in myeloid cells promotes malignant progression of glioma.

Huang Yujie Y Rajappa Prajwal P Hu Wenhuo W Hoffman Caitlin C Cisse Babacar B Kim Joon-Hyung JH Gorge Emilie E Yanowitch Rachel R Cope William W Vartanian Emma E Xu Raymond R Zhang Tuo T Pisapia David D Xiang Jenny J Huse Jason J Matei Irina I Peinado Hector H Bromberg Jacqueline J Holland Eric E Ding Bi-Sen BS Rafii Shahin S Lyden David D Greenfield Jeffrey J

The Journal of clinical investigation 20170410 5

Tumors are capable of coopting hematopoietic cells to create a suitable microenvironment to support malignant growth. Here, we have demonstrated that upregulation of kinase insert domain receptor (KDR), also known as VEGFR2, in a myeloid cell sublineage is necessary for malignant progression of gliomas in transgenic murine models and is associated with high-grade tumors in patients. KDR expression increased in myeloid cells as myeloid-derived suppressor cells (MDSCs) accumulated, which was assoc ...[more]

PMID: 28394259

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Project description:BackgroundThe recent development of dendritic cell (DC)-based immunotherapy has resulted in advances in glioblastoma multiforme (GBM) treatment. However, the cell fate of DCs in the GBM microenvironment, especially in microenvironments in which glioma stem cell (GSCs)-mediated remodeling has resulted in highly immunosuppressive conditions, has not yet been fully investigated.MethodsObserved the interaction between GSCs and primary cultured DCs in a dual-color tracing model, monoclonal and continuously passaged highly proliferative DCs, and named transformed DCs (t-DCs). The expression of DC-specific surface markers was analyzed using RT-PCR, chromosome karyotype, and flow cytometry. The expression of long pentraxin 3 (PTX3) and its transcription factor zinc finger protein 148 (ZNF148) in t-DCs was detected using qRT-PCR and western blot. CCK8 and transwell assays were conducted to assess the effect of ZNF148 and PTX3 on the proliferation, migration, and invasion of t-DCs. Bioinformatics analysis, dual-luciferase reporter assay, and chromatin immunoprecipitation (ChIP)-qPCR assay were used to explore the relation between ZNF148 and PTX3.ResultsTransformed DCs (t-DCs) still expressed DC-specific surface markers, namely, CD80 and CD11c, and immune-related costimulatory molecules, namely, CD80, CD86, CD40, and ICAM-1. However, the expression levels of these molecules in t-DCs decreased moderately compared to those in naive DCs. Stable overexpression of PTX3 further promoted the proliferation and migration of t-DCs in vitro, decreased the expression of costimulatory molecules, and increased the tumorigenicity of t-DCs in vivo. The transcription factor zinc finger protein 148 (ZNF148) was directly bound to the PTX3 promoter region and enhanced PTX3 expression. Downregulation of ZNF148 significantly decreased PTX3 expression and reduced the proliferation and migration of t-DCs. Overexpression of ZNF148 significantly increased PTX3 expression and promoted the proliferation and migration of t-DCs, achieving the same biological effects as PTX3 overexpression in t-DCs. Simultaneously, the downregulation of ZNF148 partially reversed the effect of PTX3 overexpression in t-DCs.ConclusionThe ZNF148/PTX3 axis played an important role in regulating the malignant transformation of DCs after cross-talk with GSCs, and this axis may serve as a new target for sensitizing GBM to DC-based immunotherapy.

Dataset Information

A proangiogenic signaling axis in myeloid cells promotes malignant progression of glioma.

Publications

A proangiogenic signaling axis in myeloid cells promotes malignant progression of glioma.

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