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More than 80% of the aggressive alveolar rhabdomyosarcoma (ARMSs) harbor a PAX3-FKHR fusion transcription factor, which regulates cell motility and promotes metastasis. Our hypothesis is that PAX3-FKHR regulates cell motility by regulating the expression of its transcriptional targets that are also its downstream effectors, which if identified, may lead to novel therapeutic approaches for treating ARMS. Here we report that PAX3-FKHR regulates the expression of pleiotrophin (PTN) by binding specifically to a paired-box domain binding-site in the PTN promoter, indicating that PTN is a transcriptional target of PAX3-FKHR. Significantly, we show that PTN regulates ARMS cell motility. Taken together, we have identified PTN as a novel transcriptional target of PAX3-FKHR that promotes ARMS cell motility. PTN may be a novel therapeutic target for the treatment of ARMS.

PAX3-FKHR Regulates the Expression of Pleiotrophin to Mediate Motility in Alveolar Rhabdomyosarcoma Cells