Although microRNAs (miRNAs) were revealed as crucial modulators in tumor metastasis and target therapy, our understanding of their roles in metastatic renal cell carcinoma (mRCC) and Sunitinib treatment was limited. Here we sought to identify human miRNAs that acted as key regulators in renal cancer metastasis and Sunitinib treatment.
We focused on 2 published microarray data to select out our anchored miRNA and then explored the roles of miR-452-5p both in vitro and in vivo, which was downregulated after Sunitinib treatment while upregulated in metastasis renal cell carcinoma (RCC) tissues.
Here, we discovered that treating with Sunitinib, the targeted receptor tyrosine kinase inhibitor (TKI), inhibited renal cancer cell migration and invasion via attenuating the expression of miR-452-5p. The novel identified miR-452-5p was upregulated and associated with poor prognosis in RCC. Preclinical studies using multiple RCC cells and xenografts model illustrated that miR-452-5p could promote RCC cell migration and invasion in vitro and in vivo. Mechanistically, P65 could directly bind to the miR-452-5p promoter and thus transcriptionally induce miR-452-5p expression, which led to post-transcriptionally abrogate SMAD4 expression, thus inhibition of its downstream gene SMAD7.
Our study presented a road map for targeting this newly identified miR-452-5p and its SMAD4/SMAD7 signals pathway, which imparted a new potential therapeutic strategy for mRCC treatment.
Molecular cancer. 2018 Nov 12*** epublish ***
Wei Zhai, Saiyang Li, Jin Zhang, Yonghui Chen, Junjie Ma, Wen Kong, Dongkui Gong, Junhua Zheng, Wei Xue, Yunfei Xu
Department of Urology, Renji Hospital, School of Medicine in Shanghai Jiao Tong University, 160 Pujian Road, Pudong District, Shanghai, 200127, China. ., Department of Urology, Shanghai Tenth People's Hospital, Nanjing Medical University, Nanjing, 211166, China., Department of Urology, Renji Hospital, School of Medicine in Shanghai Jiao Tong University, 160 Pujian Road, Pudong District, Shanghai, 200127, China., Department of Urology, Shanghai Tenth People's Hospital, School of Medicine in Tongji University, Shanghai, 200072, China., Department of Urology, Shanghai First People's Hospital, School of Medicine in Shanghai Jiao Tong University, Shanghai, 200080, China., Department of Urology, Renji Hospital, School of Medicine in Shanghai Jiao Tong University, 160 Pujian Road, Pudong District, Shanghai, 200127, China. ., Department of Urology, Shanghai Tenth People's Hospital, School of Medicine in Tongji University, Shanghai, 200072, China. .