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Updated: May 8, 2026
The Influence of Liver Resection on Intrahepatic Tumor Growth
Published on: April 9, 2016
Decreased roundabout 1 expression promotes development of intrahepatic cholangiocarcinoma
Yohei Mano1, Shinichi Aishima, Takasuke Fukuhara
1Department of Anatomic Pathology, Graduate School of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan; Department of Surgery and Sciences, Graduate School of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan.
Abstract:
Roundabout 1 (Robo1) is a transmembrane receptor of the immunoglobulin family. Slit2 is one of its ligands. The function of Slit2/Robo1 signaling in the development of intrahepatic cholangiocarcinoma (ICC) remains to be elucidated. We examined the immunohistochemical expression of Robo1 and Slit2 and their clinicopathologic implications in 132 cases of ICC. Also, small interfering RNA of Robo1 was transfected into a high-expression ICC cell line, and a Robo1 vector was transfected into a low-Robo1 expression ICC cell line. The effect of Robo1 suppression and overexpression in cell proliferation and migration of cultured ICC cells with Slit2 stimulation was investigated. Immunohistochemical study of ICC in the low-Robo1 expression group showed larger tumors (P = .015), a higher Ki-67 labeling index (P = .021), and low expression of Slit2 (P = .0005). The low-Slit2 expression group frequently showed perineural invasion (P = .036) and lymph node metastases (P = .013). Low Robo1 expression was associated with a poor prognosis (P = .0207). Robo1 suppression in Huh28 cells tended to promote cell proliferation and migration, whereas Robo1 overexpression in RBE cells significantly suppressed cell proliferation and migration. Low Robo1 expression was associated with cell proliferation and migration in ICC and was one of the adverse prognostic factors in patients with these tumors.
Insights
Low expression of Roundabout 1 (Robo1) in intrahepatic cholangiocarcinoma (ICC) correlates with tumor growth and poor prognosis. This suggests Robo1 signaling is a potential therapeutic target for ICC development.
Area of Science:
- Molecular Biology
- Oncology
- Cell Signaling
Background:
- Roundabout 1 (Robo1) is an immunoglobulin family transmembrane receptor.
- Slit2 is a known ligand for Robo1.
- The role of Slit2/Robo1 signaling in intrahepatic cholangiocarcinoma (ICC) pathogenesis is not well understood.
Purpose of the Study:
- To investigate the expression of Robo1 and Slit2 in ICC tissues.
- To determine the clinicopathological implications of Robo1 and Slit2 expression in ICC.
- To elucidate the functional role of Robo1 in ICC cell proliferation and migration.
Main Methods:
- Immunohistochemical analysis of Robo1 and Slit2 expression in 132 ICC cases.
- In vitro studies involving Robo1 knockdown (siRNA) and overexpression (vector transfection) in ICC cell lines (Huh28 and RBE).
- Assessment of cell proliferation and migration under Slit2 stimulation.
Main Results:
- Low Robo1 expression in ICC was associated with larger tumor size, higher Ki-67 index, and poor prognosis.
- Low Slit2 expression was linked to perineural invasion and lymph node metastasis.
- Robo1 suppression promoted ICC cell proliferation and migration, while overexpression suppressed these processes.
Conclusions:
- Reduced Robo1 expression is linked to increased proliferation and migration in ICC cells.
- Robo1 expression levels serve as an adverse prognostic factor in patients with ICC.
- The Slit2/Robo1 pathway represents a potential therapeutic target for intrahepatic cholangiocarcinoma.
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