Abstract
Delta-like ligand-4 (DLL4)-Notch signaling is known to play a pivotal role in the regulation of tumor angiogenesis. We had previously found that DLL4 was overexpressed, while Notch1 receptor, which binds to DLL4 during angiogenesis, was absent in the majority of human primary glioblastomas. Thus, DLL4-Notch signaling pathway in the regulation of tumor angiogenesis in primary glioblastoma remains unknown. Tumor tissues from 70 patients with primary glioblastoma were analyzed by immunohistochemistry for expression of components of DLL4-Notch signaling, vascular endothelial growth factor (VEGF), and microvessel density (MVD). Immunohistochemistry results showed that the positive staining of DLL4 and Notch4 was primarily distributed in tumor vascular endothelial cells but rarely detected in tumor cells. However, VEGF, hairy/enhancer of split-1 (HES1; a target gene of Notch signaling), and Notch1–3 expression was seen in both tumor vascular endothelial cells and tumor cells. Univariate analysis showed that the expression levels of VEGF and DLL4, HES1, and Notch4 in tumor endothelial cells were significantly associated with MVD in primary glioblastoma (P < 0.001). Binary logistic regression analysis showed that high expression levels of DLL4, HES1, and Notch4 in tumor endothelial cells were associated with a decrease of MVD in primary glioblastoma, while MVD increased with elevated VEGF expression in contrast. In addition, DLL4, Notch4, and HES1 expression were positively correlated in tumor vascular endothelial cells (P < 0.05). We conclude that the vascular DLL4-Notch4 signaling and VEGF signaling complementing each other plays an important role in the progression of tumor angiogenesis in primary glioblastoma.
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Abbreviations
- MVD:
-
Microvessel density
- VEGF:
-
Vascular endothelial growth factor
- DLL4:
-
Delta-like ligand-4
- NICD:
-
Notch intracellular domain
- WHO:
-
World Health Organization
- PBS:
-
Phosphate buffer solution
- DAB:
-
Diaminobenzidine
- EC:
-
Endothelial cells
- TC:
-
Tumor cell
- GSC:
-
Glioma stem cell
- PI3k:
-
Phosphatidylinositol 3-kinase
- EGFR:
-
Epidermal growth factor receptor
- MMP-9:
-
Matrix metalloprotein-9
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Acknowledgments
This study was supported by the National Natural Science Foundation of China (No. 21435002). The authors would like to thank the Department of Pathology, First Affiliated Hospital, Fujian Medical University, for their help in immunohistochemistry design and the Public Health School, Fujian Medical University, Fujian, China, for assistance in data processing and statistical analysis.
Authors’ contributions
JFZ and YC analyzed the data and drafted the manuscript. YC, JFZ, and XXQ performed the experiments. XFW and JDZ provided material support. WLT, GSL, and JHH contributed to data collection and helped in the analysis. ZXL conceived the study and participated in its design and coordination. All authors read and approved the final manuscript.
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Jin-feng Zhang and Yao Chen contributed equally to this work.
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Zhang, Jf., Chen, Y., Qiu, Xx. et al. The vascular delta-like ligand-4 (DLL4)-Notch4 signaling correlates with angiogenesis in primary glioblastoma: an immunohistochemical study. Tumor Biol. 37, 3797–3805 (2016). https://doi.org/10.1007/s13277-015-4202-8
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DOI: https://doi.org/10.1007/s13277-015-4202-8