Upregulation of RICTOR gene transcription by the proinflammatory cytokines through NF-κB pathway contributes to the metastasis of renal cell carcinoma

作者：Sun, Bo; Chen, Liwei; Fu, Hui; Guo, Lin; Guo, Hua^*; Zhang, Ning^*

来源：Tumor Biology, 2016, 37(4): 4457-4466.

DOI：10.1007/s13277-015-4296-z

• Metastasis
• NF-kappa B
• Rictor
• Renal cell carcinoma
• TNF alpha

Metastasis accounts for more than 50 % of deaths among renal cell carcinoma (RCC) patients, and therefore, it is important to study the biology of metastasis and identify metastasis-associated biomarkers for risk prognosis and stratification of patients for an individualized therapy of RCC. In cultured RCC cells, knockdown of Rictor by short hairpin RNA (shRNA) inhibited cell migration and invasion, probably due to impairments in activation of Akt. Pretreatment with tumor necrosis factor alpha (TNF alpha) or interleukin 6 (IL-6) enhanced the expression of Rictor and the migration of renal cancer cells. Mechanistic analysis showed that TNF alpha induced the activation of NF-kappa B in RCC cells. Luciferase reporter analysis revealed a NF-kappa B responding element (-301 to -51 bp) at the promoter region of Rictor. Chromatin immunoprecipitation (ChIP) analysis further confirmed that TNF alpha-induced binding of p65 with the promoter of Rictor. In a xenograft model, knockdown of Rictor-blocked RCC cells metastasis to the mouse lungs and livers. Taken together, our results suggest that the proinflammatory cytokine TNF alpha promotes the expression of Rictor through the NF-kappa B pathway.

• 出版日期2016-4
• 单位天津医科大学