Abstract
Background
L1 cell adhesion molecule (L1CAM), which belongs to the immunoglobulin superfamily, has recently been observed in a variety of human malignancies. However, its clinical implication in gastric cancer remains unclear. The aim of this study was to explore the role of L1CAM in gastric cancer and to analyze its correlation with tumor progression and prognosis.
Methods
L1CAM expression was measured in human gastric cancer cell lines and knockdown was conducted using siRNA. Cell proliferation, invasion and migration ability was assessed in vitro. The downstream pathway of L1CAM was explored by western blot analysis. L1CAM expression was measured in 112 pairs of human gastric cancer and adjacent noncancerous tissues using real-time quantitative RT-PCR, and the correlation with clinicopathological features and prognosis was analyzed.
Results
L1CAM downregulation by siRNA significantly decreased cell proliferation, migration, and invasion in gastric cancer cell lines. Phosphorylated ERK levels began to decline more rapidly in L1CAM knockdown cells compared with parental cells. L1CAM overexpression was significantly correlated with local tumor cell growth (P = 0.041), distant metastasis (P = 0.047), and tumor stage (P = 0.031). The overall survival in patients with high L1CAM expression was significantly shorter than that of patients with low L1CAM expression (P = 0.02).
Conclusions
L1CAM overexpression may be a critical prognostic factor in patients with gastric cancer, and was strongly associated with tumor proliferation, migration, and invasion through the ERK pathway. L1CAM might be an attractive therapeutic molecular target for the treatment of gastric cancer patients.
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Supplementary Fig. S1
Silencing of L1CAM by siRNA knockdown in representative cell lines. The mRNA levels of L1CAM in L1CAM and parental KATOIII, MKN1, MKN74, SC-6-JCK and MKN28 cells were confirmed by real-time PCR with GAPDH serving as a loading control (a). The protein levels of L1CAM in these cells were confirmed by western blot analysis with β-actin as a loading control (b, c). Cont: Control (PPT 388 kb)
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Ito, T., Yamada, S., Tanaka, C. et al. Overexpression of L1CAM is Associated with Tumor Progression and Prognosis via ERK Signaling in Gastric Cancer. Ann Surg Oncol 21, 560–568 (2014). https://doi.org/10.1245/s10434-013-3246-5
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DOI: https://doi.org/10.1245/s10434-013-3246-5