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As an independent unfavorable prognostic factor, IL-8 promotes metastasis of nasopharyngeal carcinoma through induction of epithelial-mesenchymal transition and activation of AKT signaling.

Li XJ, Peng LX, Shao JY, Lu WH, Zhang JX, Chen S, Chen ZY, Xiang YQ, Bao YN, Zheng FJ, Zeng MS, Kang TB, Zeng YX, Teh BT, Qian CN - Carcinogenesis (2012)

Bottom Line: Suppression of IL-8 by short-hairpin RNA reduced the expression of IL-8 in S18 cells and subsequently inhibited migration, invasion, and hepatic metastasis of the cells without influencing cellular growth.Further, IL-8-promoted migration and invasion could be abolished by either the application of the phosphoinositide-3-kinase inhibitor LY294002 or the knock down of AKT expression by using small-interfering RNA.In summary, IL-8 serves as an independent prognostic indicator of overall survival, disease-free survival, and metastasis-free survival for patients with NPC.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Oncology in South China, Sun Yat-sen University Cancer Center, 651 Dongfeng East Road, Guangzhou, Guangdong 510060, P R China.

ABSTRACT
Nasopharyngeal carcinoma (NPC) has the highest metastatic potential among head and neck cancers. Distant metastasis is the major cause of treatment failure. The role of interleukin-8 (IL-8) in NPC progression remains unknown. Our multivariate survival analyses of 255 patients with NPC revealed that higher IL-8 expression in primary NPC tissue was an independent prognostic factor for overall survival, disease-free survival, and distant metastasis-free survival of the patients. In vitro study revealed that IL-8 was highly expressed in the established high-metastasis NPC clone S18 relative to the low-metastasis cells. Suppression of IL-8 by short-hairpin RNA reduced the expression of IL-8 in S18 cells and subsequently inhibited migration, invasion, and hepatic metastasis of the cells without influencing cellular growth. Overexpression of IL-8 in S26 cells resulted in increased migration, invasion, and metastasis capabilities of the cells without affecting cellular growth. Exogenous IL-8 enhanced the migration and invasion of low-metastasis CNE-2 cells in a dose-dependent manner. An epithelial-mesenchymal transition (EMT) could be induced by IL-8 in various NPC cell lines. The high level of phosphorylated AKT in S18 cells could be suppressed by knocking down IL-8 expression. Further, IL-8-promoted migration and invasion could be abolished by either the application of the phosphoinositide-3-kinase inhibitor LY294002 or the knock down of AKT expression by using small-interfering RNA. In summary, IL-8 serves as an independent prognostic indicator of overall survival, disease-free survival, and metastasis-free survival for patients with NPC. IL-8 promotes NPC metastasis via autocrine and paracrine means, involving activation of AKT signaling and inducing EMT in NPC cells.

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Related in: MedlinePlus

High IL-8 expression correlates with shorter overall survival, disease-free survival, and distant-metastasis-free survival in patients with NPC. (A) Tissue microarrays representative of those from 255 patients with NPC diagnosed at the M0 stage immunohistochemically stained using antibody against IL-8, at low (40×) and high (400×) magnification in a light microscope. Black scale bars0 500 µm; yellow scale bars, 100 µm. (B) The median follow-up time of these 255 patients was 69 months. (C) Overall survival (OS) curve. (D) Disease-free survival (DFS) curve. (E) Distant-metastasis-free survival (DMFS) curve. P values were calculated by the log-rank test.
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Figure 1: High IL-8 expression correlates with shorter overall survival, disease-free survival, and distant-metastasis-free survival in patients with NPC. (A) Tissue microarrays representative of those from 255 patients with NPC diagnosed at the M0 stage immunohistochemically stained using antibody against IL-8, at low (40×) and high (400×) magnification in a light microscope. Black scale bars0 500 µm; yellow scale bars, 100 µm. (B) The median follow-up time of these 255 patients was 69 months. (C) Overall survival (OS) curve. (D) Disease-free survival (DFS) curve. (E) Distant-metastasis-free survival (DMFS) curve. P values were calculated by the log-rank test.


As an independent unfavorable prognostic factor, IL-8 promotes metastasis of nasopharyngeal carcinoma through induction of epithelial-mesenchymal transition and activation of AKT signaling.

Li XJ, Peng LX, Shao JY, Lu WH, Zhang JX, Chen S, Chen ZY, Xiang YQ, Bao YN, Zheng FJ, Zeng MS, Kang TB, Zeng YX, Teh BT, Qian CN - Carcinogenesis (2012)

High IL-8 expression correlates with shorter overall survival, disease-free survival, and distant-metastasis-free survival in patients with NPC. (A) Tissue microarrays representative of those from 255 patients with NPC diagnosed at the M0 stage immunohistochemically stained using antibody against IL-8, at low (40×) and high (400×) magnification in a light microscope. Black scale bars0 500 µm; yellow scale bars, 100 µm. (B) The median follow-up time of these 255 patients was 69 months. (C) Overall survival (OS) curve. (D) Disease-free survival (DFS) curve. (E) Distant-metastasis-free survival (DMFS) curve. P values were calculated by the log-rank test.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3405654&req=5

Figure 1: High IL-8 expression correlates with shorter overall survival, disease-free survival, and distant-metastasis-free survival in patients with NPC. (A) Tissue microarrays representative of those from 255 patients with NPC diagnosed at the M0 stage immunohistochemically stained using antibody against IL-8, at low (40×) and high (400×) magnification in a light microscope. Black scale bars0 500 µm; yellow scale bars, 100 µm. (B) The median follow-up time of these 255 patients was 69 months. (C) Overall survival (OS) curve. (D) Disease-free survival (DFS) curve. (E) Distant-metastasis-free survival (DMFS) curve. P values were calculated by the log-rank test.
Bottom Line: Suppression of IL-8 by short-hairpin RNA reduced the expression of IL-8 in S18 cells and subsequently inhibited migration, invasion, and hepatic metastasis of the cells without influencing cellular growth.Further, IL-8-promoted migration and invasion could be abolished by either the application of the phosphoinositide-3-kinase inhibitor LY294002 or the knock down of AKT expression by using small-interfering RNA.In summary, IL-8 serves as an independent prognostic indicator of overall survival, disease-free survival, and metastasis-free survival for patients with NPC.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Oncology in South China, Sun Yat-sen University Cancer Center, 651 Dongfeng East Road, Guangzhou, Guangdong 510060, P R China.

ABSTRACT
Nasopharyngeal carcinoma (NPC) has the highest metastatic potential among head and neck cancers. Distant metastasis is the major cause of treatment failure. The role of interleukin-8 (IL-8) in NPC progression remains unknown. Our multivariate survival analyses of 255 patients with NPC revealed that higher IL-8 expression in primary NPC tissue was an independent prognostic factor for overall survival, disease-free survival, and distant metastasis-free survival of the patients. In vitro study revealed that IL-8 was highly expressed in the established high-metastasis NPC clone S18 relative to the low-metastasis cells. Suppression of IL-8 by short-hairpin RNA reduced the expression of IL-8 in S18 cells and subsequently inhibited migration, invasion, and hepatic metastasis of the cells without influencing cellular growth. Overexpression of IL-8 in S26 cells resulted in increased migration, invasion, and metastasis capabilities of the cells without affecting cellular growth. Exogenous IL-8 enhanced the migration and invasion of low-metastasis CNE-2 cells in a dose-dependent manner. An epithelial-mesenchymal transition (EMT) could be induced by IL-8 in various NPC cell lines. The high level of phosphorylated AKT in S18 cells could be suppressed by knocking down IL-8 expression. Further, IL-8-promoted migration and invasion could be abolished by either the application of the phosphoinositide-3-kinase inhibitor LY294002 or the knock down of AKT expression by using small-interfering RNA. In summary, IL-8 serves as an independent prognostic indicator of overall survival, disease-free survival, and metastasis-free survival for patients with NPC. IL-8 promotes NPC metastasis via autocrine and paracrine means, involving activation of AKT signaling and inducing EMT in NPC cells.

Show MeSH
Related in: MedlinePlus