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Filamin associates with Smads and regulates transforming growth factor-beta signaling

Sasaki, A ; Masuda, Y ; Ohta, Y ; Ikeda, K ; Watanabe, K

The Journal of biological chemistry, 25 May 2001, Vol.276(21), pp.17871-7 [Periódico revisado por pares]

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  • Título:
    Filamin associates with Smads and regulates transforming growth factor-beta signaling
  • Autor: Sasaki, A ; Masuda, Y ; Ohta, Y ; Ikeda, K ; Watanabe, K
  • Assuntos: Signal Transduction ; Contractile Proteins -- Metabolism ; Microfilament Proteins -- Metabolism ; Transforming Growth Factor Beta -- Metabolism
  • É parte de: The Journal of biological chemistry, 25 May 2001, Vol.276(21), pp.17871-7
  • Descrição: Members of the Smad proteins transmit signals triggered by the ligands of transforming growth factor (TGF)-beta superfamily. Ligand-activated receptors induce phosphorylation of so-called receptor-regulated Smads, which then accumulate in the nucleus to participate in target gene transcription, in collaboration with Smad-interacting proteins. We performed yeast two-hybrid screening and identified filamin, a cytoskeletal actin-binding protein 280, as a Smad5-interacting protein. Filamin was found to be associated not only with Smad5 but also with other Smad proteins, including TGF-beta/activin receptor-regulated Smad2. TGF-beta signaling was defective in filamin-deficient human melanoma cells M2 compared with a filamin-transfected subline A7, as determined by TGF-beta-responsive reporter gene activation and Smad2 nuclear accumulation. M2 cells restored TGF-beta responsiveness following transient transfection of full-length filamin encoding vector. The defective TGF-beta signaling in M2 cells seemed to be due to impaired receptor-induced serine phosphorylation of Smad2. These results suggest that filamin plays an important role in Smad-mediated signaling.
  • Idioma: Inglês

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