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Association of elevated GRP78 expression with increased lymph node metastasis and poor prognosis in patients with gastric cancer

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Abstract

Glucose-regulated protein 78 (GRP78) has been implicated in the protection of tumor cells from cytotoxic damage and apoptosis and thus assists cells in survival under oxygen-deprivation and nutrient-stress conditions. However, its expression and potential role in gastric cancer development and progression have not been reported. In the present study, we determined the level of GRP78 expression in the primary tumor in 86 cases of resected gastric cancer by using immunohistochemistry and analyzed the relationships between GRP78 and clinicopathological characteristics. We found that GRP78 was overexpressed in the tumor specimens when compared with the expression in adjacent tumor-free gastric mucosa. Furthermore, the level of GRP78 expression in both primary tumors and metastatic lymph nodes was inversely correlated with patient survival. Overexpression of GRP78 was directly correlated with Sp1 expression and increased lymph node metastasis. Knocking down GRP78 expression inhibited tumor cell invasion in vitro and growth and metastasis in a xenograft nude mouse model. Therefore, our data imply that dysregulated expression of GRP78 may contribute to the development and progression of gastric cancer.

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Acknowledgments

We thank Emily Karotkin for preparation of this manuscript and Don Norwood for editorial comments. This work was supported in part by Research Scholar Grant CSM-106640 from the American Cancer Society and Grant 1R01-CA093829 from the National Cancer Institute (K. Xie) and Grant 1R01-GM69967 from the National Institute of General Medical Sciences (S. Fang), National Institutes of Health.

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Correspondence to Keping Xie.

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Zhang, J., Jiang, Y., Jia, Z. et al. Association of elevated GRP78 expression with increased lymph node metastasis and poor prognosis in patients with gastric cancer. Clin Exp Metastasis 23, 401–410 (2006). https://doi.org/10.1007/s10585-006-9051-9

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  • DOI: https://doi.org/10.1007/s10585-006-9051-9

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