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It has been indicated that the C‑X‑C chemokine receptor type 4/C‑X‑C chemokine ligand 12 (CXCR4/CXCL12) axis is involved in promoting invasion and metastasis in tumors. Therefore, novel drugs capable of downregulating the CXCR4/CXCL12 axis may demonstrate potential for the treatment of metastatic prostate cancer (PCa). Rosiglitazone (RSG), a thiazolidinedione ligand of the peroxisome proliferator‑activated receptor (PPAR) γ, has been found to inhibit proliferation, induce apoptosis, suppress angiogenesis and inhibit metastasis. However, the precise mechanisms by which RSG regulates CXCR4 gene expression and the consequent effects on prostate cell migration and invasion are not fully understood. In this study, it was observed that RSG is capable of downregulating the expression of CXCR4 in PCa cells in a dose‑, time‑ and PPARγ‑dependent manner. Furthermore, it was observed that the downregulation of CXCR4 expression occurred at a transcriptional level, as indicated by a reduction in CXCR4 mRNA expression. Suppression of CXCR4 expression by RSG further correlated with the inhibition of CXCL12‑induced migration and invasion in PCa cells. Analysis of the predominant intracellular signaling pathways that act downstream of the activated CXCR4/CXCL12 axis, namely the phosphatidyl inositol 3‑kinase (PI3K)‑protein kinase B (Akt) cascades, revealed that RSG rapidly interferes with the phosphorylation/activation of Akt, which mediates CXCL12‑stimulated migration and invasion. Overall, the findings of this study suggest that RSG represents a novel inhibitor of CXCR4 expression and, thus, has significant potential as a powerful therapeutic agent for the treatment of metastatic PCa.

molecular medicine reports

Peroxisome proliferator-activated receptor γ agonist rosiglitazone inhibits migration and invasion of prostate cancer cells through inhibition of the CXCR4/CXCL12 axis