Cyclic AMP responsive element-binding protein induces metastatic renal cell carcinoma by mediating the expression of matrix metallopeptidase-2/9 and proteins associated with epithelial-mesenchymal transition

Wang,Xue; Cui,Hui; Lou,Zhongguan; Huang,Shuaishuai; Ren,Yu; Wang,Ping; Weng,Guobin

doi:10.3892/mmr.2017.6519

Cyclic AMP responsive element-binding protein induces metastatic renal cell carcinoma by mediating the expression of matrix metallopeptidase-2/9 and proteins associated with epithelial-mesenchymal transition

Authors:
- Xue Wang
- Hui Cui
- Zhongguan Lou
- Shuaishuai Huang
- Yu Ren
- Ping Wang
- Guobin Weng
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Affiliations: Department of Urologic Surgery, Ningbo Urology and Nephrology Hospital, Ningbo, Zhejiang 315000, P.R. China, Laboratory of Kidney Carcinoma, Urology and Nephrology Institute of Ningbo University, Ningbo, Zhejiang 315000, P.R. China
Published online on: April 27, 2017 https://doi.org/10.3892/mmr.2017.6519
Pages: 4191-4198

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Abstract

Renal cell carcinoma (RCC) is the most frequently occurring malignancy of the kidney worldwide. Anti-angiogenic targeted therapies inhibit the progression of RCC, however, limited effects on the invasion or metastasis of tumor cells have been observed. Cyclic AMP responsive element‑binding protein (CREB) is a serine/threonine kinase that has been implicated in the regulation of cell proliferation, apoptosis, cycle progression and metastasis, amongst others. Our previous research demonstrated that phosphorylated CREB (pCREB) was upregulated in human renal cancer cell lines and tissues, and decreased pCREB at the Ser133 site inhibited the growth and metastatic activity of OS‑RC‑2 cells. However, the role of CREB in RCC metastasis requires further investigation. Thus, the present study further investigated the role of CREB in RCC metastasis. The present study demonstrated that knockdown of CREB using small interfering RNA (siRNA) that targeted CREB (siCREB) significantly inhibited the migration and invasion of 786‑O and OS‑RC‑2 cells, however, the opposite effect was observed in ACHN cells. In addition, knockdown of CREB suppressed the expression of matrix metallopeptidase (MMP)‑2/9 and proteins associated with epithelial‑mesenchymal transition (EMT) in 786‑O and OS‑RC‑2 cells, and promoted expression in ACHN cells. Furthermore, the chromatin immunoprecipitation assay indicated that pCREB (Ser133) had a direct interaction with the fibronectin promoter, however, pCREB (Ser133) did not target the vimentin promoter in RCC. Therefore, the results of the present study indicate that CREB regulated metastatic RCC by mediating the expression of MMP‑2/9 and EMT‑associated proteins, however, CREB‑mediated MMP‑2/9 and EMT‑associated protein expression may be induced by different pathways in different RCC cells.

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