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Increased EphB2 expression predicts cholangiocarcinoma metastasis
Walaiporn Khansaard1, Anchalee Techasen, Nisana Namwat
1Department of Biochemistry, Liver Fluke and Cholangiocarcinoma Research Center, Faculty of Medicine, Khon Kaen University, Khon Kaen, 40002, Thailand.
Abstract:
The activation of Ephrin (Eph) receptors, the largest tyrosine kinase families of cell surface receptor, has recently been addressed in human cholangiocarcinoma (CCA). Therefore, the present study aimed to investigate the role of Eph receptors and its ligands in CCA. Of all 50 cases of human CCA tested, immunohistochemical staining demonstrated that EphB2, EphB4, ephrinB1, and ephrinB2 were 100 % positive in CCA tissues with overexpressions of the above proteins as 56, 56, 70, and 48 % of cases, respectively. High expression of EphB2 was significantly correlated with the metastatic status of patients (P = 0.027). We also found that the high co-expression level of EphB2/ephrinB1 or EphB2/ephrinB2 were significantly correlated with the metastatic status of the patients (P = 0.034 and P = 0.024). Furthermore, we showed that the high co-expression level of EphB4/MVD and ephrinB1/MVD were significantly correlated with the metastasis status of CCA patients (P = 0.012 and P = 0.029). We further demonstrated that the EphB2 suppression using siRNA significantly reduced CCA cell migration by decreasing the phosphorylation of focal adhesion kinase (FAK) and paxillin. In conclusion, the upregulation of EphB2 receptors and its specific ligands (ephrinB1 and ephrinB2) leads to CCA metastasis. Suppression of EphB2 expression as well as inhibition of its downstream signaling proteins might serve as possible therapeutic strategies in human CCA.
Insights
EphB2 receptors and ephrinB1/B2 ligands are upregulated in cholangiocarcinoma (CCA), promoting metastasis. Suppressing EphB2 may offer a therapeutic strategy for CCA by inhibiting cell migration and downstream signaling.
Area of Science:
- Molecular Biology
- Oncology
Background:
- Eph receptors and their ligands are cell surface receptors involved in cell signaling.
- Recent studies suggest a role for Eph receptors in human cholangiocarcinoma (CCA).
Purpose of the Study:
- To investigate the expression and role of Eph receptors and their ligands in human CCA.
- To explore the correlation between Eph receptor/ligand expression and CCA metastasis.
- To evaluate the therapeutic potential of targeting EphB2 in CCA.
Main Methods:
- Immunohistochemical staining of 50 human CCA tissues to assess EphB2, EphB4, ephrinB1, and ephrinB2 expression.
- Correlation analysis between protein expression levels and clinicopathological features, including metastatic status.
- siRNA-mediated suppression of EphB2 in CCA cells to evaluate effects on cell migration and downstream signaling pathways (FAK, paxillin).
Main Results:
- EphB2, EphB4, ephrinB1, and ephrinB2 were 100% positive in CCA tissues.
- High expression of EphB2 and co-expression of EphB2/ephrinB1 or EphB2/ephrinB2 significantly correlated with metastasis.
- High co-expression of EphB4/MVD and ephrinB1/MVD also correlated with metastasis.
- EphB2 suppression reduced CCA cell migration and decreased FAK/paxillin phosphorylation.
Conclusions:
- Upregulation of EphB2 receptors and ephrinB1/B2 ligands contributes to CCA metastasis.
- Targeting EphB2 and its downstream signaling pathways presents a potential therapeutic strategy for human CCA.
