C2C12 cells were transfected with the TauT promoter-reporter plasmid (pTauT/−862-luc, pTauT/−834-luc, pTauT/−269-luc or pTauT−99-luc) and pRL-TK. After 18 h of cultivation in GM, cells were cultured in DM for 2 days. The promoter activity of the TauT gene was measured and normalized to the luciferase activity of pRL-TK. pl-luc basic vector was used as a promoterless control. Results are means±S.E.M., n=3. The putative binding sites of MEF2, the E-box for bHLH transcription factors, and SRF in the −862/+46 TauT promoter region are shown. The experiments were repeated three times with similar results. *, P<0.05; **, P<0.01.