A functional genetic screen identifies TFE3 as a gene that confers resistance to the anti-proliferative effects of the retinoblastoma protein and transforming growth factor-β

Abstract

The helix-loop-helix transcription factor TFE3 has been suggested to play a role in the control of cell growth by acting as a binding partner of transcriptional regulators such as E2F3, SMAD3, and LEF-1 (1-4). Furthermore, translocations/TFE3 fusions have been directly implicated in tumorigenesis (5-7). Surprisingly, however, a direct functional role for TFE3 in the regulation of proliferation has not been reported. By screening retroviral cDNA expression libraries to identify cDNAs that confer resistance to a pRB-induced proliferation arrest, we have found that TFE3 overrides a growth arrest in Rat1 cells induced by pRB and its upstream regulator p16INK4A. In addition, TFE3 expression blocks the anti-mitogenic effects of TGF-β in rodent and human cells. We provide data supporting a role for endogenous TFE3 in the direct regulation of CYCLIN E expression in an E2F3-dependent manner. These observations establish TFE3 as a functional regulator of proliferation and offer a potential mechanism for its involvement in cancer. © 2006 by The American Society for Biochemistry and Molecular Biology, Inc.