We demonstrate that ETV5 is regulated both at the protein and mRNA levels upon ALK activation or inhibition in neuroblastoma cell lines and that this regulation precedes RET modulation.
RET expression is enhanced in vitro by several differentiating agents, including retinoic acid (RA), which up-regulates RET expression in neuroblastoma cell lines.
We developed a RET mini-gene reporter system, and showed that MCS+9.7 enhanced HOXB5 trans-activation from RET promoter in human neuroblastoma SK-N-SH cells and in chick embryos.
We have also demonstrated by the in vitro premethylation of a RET promoter-chloramphenicol acetyltransferase (CAT) gene construct and transient transfection experiments into neuroblastoma cells that the transcriptional activity of the RET promoter is decreased by HpaII (5'-CCGG-3') methylation and abolished by SssI (5'-CG-3') methylation.