Thrombospondin-2 promotes prostate cancer bone metastasis by the up-regulation of matrix metalloproteinase-2 through down-regulating miR-376c expression

Po Chun Chen, Chih Hsin Tang, Liang Wei Lin, Chun Hao Tsai, Cheng Ying Chu, Tien Huang Lin, Yuan Li Huang

研究成果: 雜誌貢獻文章

21 引文 斯高帕斯(Scopus)

摘要

Background: Thrombospondin-2 (TSP-2) is a secreted matricellular glycoprotein that is found to mediate cell-to-extracellular matrix attachment and participates in many physiological and pathological processes. The expression profile of TSP-2 on tumors is controversial, and it up-regulates in some cancers, whereas it down-regulates in others, suggesting that the functional role of TSP-2 on tumors is still uncertain. Methods: The expression of TSP-2 on prostate cancer progression was determined in the tissue array by the immunohistochemistry. The molecular mechanism of TSP-2 on prostate cancer (PCA) metastasis was investigated through pharmaceutical inhibitors, siRNAs, and miRNAs analyses. The role of TSP-2 on PCA metastasis in vivo was verified through xenograft in vivo imaging system. Results: Based on the gene expression omnibus database and immunohistochemistry, we found that TSP-2 increased with the progression of PCA, especially in metastatic PCA and is correlated with the matrix metalloproteinase-2 (MMP-2) expression. Additionally, through binding to CD36 and integrin ανβ3, TSP-2 increased cell migration and MMP-2 expression. With inhibition of p38, ERK, and JNK, the TSP-2-induced cell migration and MMP-2 expression were abolished, indicating that the TSP-2's effect on PCA is MAPK dependent. Moreover, the microRNA-376c (miR-376c) was significantly decreased by the TSP-2 treatment. Furthermore, the TSP-2-induced MMP-2 expression and the subsequent cell motility were suppressed upon miR-376c mimic stimulation. On the other hand, the animal studies revealed that the bone metastasis was abolished when TSP-2 was stably knocked down in PCA cells. Conclusions: Taken together, our results indicate that TSP-2 enhances the migration of PCA cells by increasing MMP-2 expression through down-regulation of miR-376c expression. Therefore, TSP-2 may represent a promising new target for treating PCA.
原文英語
文章編號33
期刊Journal of Hematology and Oncology
10
發行號1
DOIs
出版狀態已發佈 - 一月 25 2017

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ASJC Scopus subject areas

  • Hematology
  • Molecular Biology
  • Oncology
  • Cancer Research

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