title: [Study of TGF-β/Smad3 signal pathway using the technology of flurorescence resonance energy transfer].
abstract: The transforming growth factor-β1 (TGF-β1)/Smad3 signal pathway is related to mutiple physiological and pathological generation mechanism of human being. Up to date, however, the spacial and time information on the phosphorylated Smad3 is still unclear. In this study, the process of Smad3 phosphorylation was observed under the physiological state in the living cells. Firstly, the ECFP-Smad3-Citrine (Smad3 biosensor) fusion protein expression vector was constructed and identified. Then the Smad3 biosensor was transfected into 293T cells. The transfection efficiency and the expressions of fusion proteins were observed in 24 hours. Thirdly, Smad3 biosensor flurorescence resonance energy transfer (FRET) was observed with the inversion fluorescence microscope and measured by the MetaFlour FRET 4. 6 software. Smad3 biosensor transfection efficiency was nearly 40% and the fusion protein was seen under the fluorescence microscope. The FRET ratio of Smad3 biosensor in living 293T cells was decreased after 10 minutes incubation with the ligand of TGF-β1. The period of decreasing CFP and enhancing Citrine signals was about 300 seconds. With the technology of FRET, the TGF-β1/Smad3 signal pathway could be real time monitored dynamically under the physiological condition in living cells.
authors.forename: Weiwei
authors.initials: W
authors.lastname: Cao
authors.forename: Wei
authors.initials: W
authors.lastname: Liu
authors.forename: Weishan
authors.initials: W
authors.lastname: Wang
authors.forename: Zhao
authors.initials: Z
authors.lastname: Chen
authors.forename: Renhao
authors.initials: R
authors.lastname: He
authors.forename: Jianwei
authors.initials: J
authors.lastname: He
mesh_terms: D031541:Fluorescence Resonance Energy Transfer; D005822:Genetic Vectors; D057809:HEK293 Cells; D006801:Humans; D008856:Microscopy, Fluorescence; D010766:Phosphorylation; D015398:Signal Transduction; D051900:Smad3 Protein / Q000378:metabolism*; D012984:Software; D014162:Transfection; D053773:Transforming Growth Factor beta1 / Q000378:metabolism*
chemical_list: C497790:SMAD3 protein, human; D051900:Smad3 Protein; D053773:Transforming Growth Factor beta1