Aim To investigate TH and GDNF genes expression and regulation of lentivirus( Lv-TH-GDNF)based on improved Tet-On system and the effect of the Lv-TH-GDNF intrastriatal transfer on a rat Parkinson's disease( PD) model. Methods 1. He La cells wereinfected by obtained Lv-TH-GDNF and rtT A2s-M2 virus. The expression of tyrosine hydroxylase( TH) and glial cell line-derived neurotrophic factor( GDNF) genes was induced by doxycycline( Dox) which was examined by Western blot. 2. The Lv-TH-GDNF together withrtT A2s-...