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A review on the role of different ephrins in glioma
Bochi Zhu1, Yunfeng Li1, Xijing Mao1
1Department of Neurology, The Second Hospital of Jilin University, 218 Ziqiang Street, Nanguan District, Chang Chun City, Jilin Province, 130041, China.
Abstract:
Gliomas, tumors of glial cells, are the most common malignant tumors of the brain. Ephrins are protein ligands that act through tyrosine kinases receptor family, Eph receptors. In glioma, an inverse relationship has been identified between ephrin A1 ligand and EphA2 receptors i.e. there has been a decrease in the expression of ephrin A1 and increase in the expression of EphA2. The forced expression of ephrin A1 decreases the proliferation of glioma by internalizing the EphA2 receptors. The ligand (ephrin A1)-independent effects of EphA2 receptors are oncogenic in nature, while the binding of EphA2 with ephrin A1 decreases the glioma proliferation. An increase in EphA4 may be important in enhancing cellular proliferation and migration of glioblastoma through FGFR-MAPK-Akt signaling pathway, while a decrease in the expression of EphA5 may be crucial in increasing the cellular proliferation and thus, ephrin A5 acts as a tumor suppressor in glioma by negatively regulating the expression of EGFR. The higher expression levels of EphB2 and its ligand, ephrin B1 may decrease the cell adhesion and increase the invasion capacity of glioma through HIF-2α-EphB2-paxillin signalling. There is also a key role of ephrin B2 and EphB2 in promoting migration, invasion and conferring resistance to glioma cell. Ephrin B2 contributes in the pathogenesis of glioma by promoting angiogenesis through VEGF-A. An increase in ephrin B3 may also be important in the increasing tumorigenicity of glioma. The present review describes the role of different ephrins in the pathogenesis of glioma.
Insights
Ephrins and their receptors play diverse roles in glioma development. Modulating these interactions, like ephrin A1 with EphA2, offers potential therapeutic strategies for brain tumors.
Area of Science:
- Neuro-oncology
- Molecular biology
- Cancer research
Background:
- Gliomas are the most common malignant brain tumors, arising from glial cells.
- Ephrins are protein ligands that interact with Eph receptors, a family of tyrosine kinases.
- Aberrant ephrin and Eph receptor signaling is implicated in various cancers, including glioma.
Purpose of the Study:
- To review the multifaceted roles of different ephrins in the pathogenesis of glioma.
- To elucidate the specific interactions and signaling pathways involving ephrins and Eph receptors in glioma.
- To highlight the potential of targeting ephrin-Eph signaling for glioma treatment.
Main Methods:
- Literature review of studies investigating ephrin and Eph receptor expression and function in glioma.
- Analysis of signaling pathways, including FGFR-MAPK-Akt, HIF-2α-EphB2-paxillin, and VEGF-A, associated with ephrin-Eph interactions in glioma.
- Examination of the impact of altered ephrin and Eph receptor levels on glioma cell proliferation, migration, invasion, and angiogenesis.
Main Results:
- An inverse relationship between ephrin A1 and EphA2 expression in glioma, where increased EphA2 and decreased ephrin A1 correlate with malignancy. Forced ephrin A1 expression inhibits glioma proliferation.
- EphA4 promotes glioblastoma proliferation and migration, while ephrin A5 acts as a tumor suppressor by downregulating EGFR.
- Ephrin B1/EphB2 and ephrin B2/EphB2 signaling pathways are linked to increased glioma invasion, migration, angiogenesis (via VEGF-A), and therapeutic resistance.
Conclusions:
- Ephrins and their receptors exhibit complex and often opposing roles in glioma pathogenesis, acting as both oncogenes and tumor suppressors depending on the specific family member and context.
- Understanding these distinct roles and signaling cascades is crucial for developing targeted therapies against gliomas.
- Modulation of ephrin-Eph signaling pathways presents a promising avenue for future glioma treatment strategies.
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