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Related Experiment Videos

Nuclear and cytoplasmic c-Ski differently modulate cellular functions.

Motoko Nagata1, Kouichiro Goto, Shogo Ehata

  • 1Department of Molecular Pathology, Graduate School of Medicine, University of Tokyo, Tokyo 113-0033, Japan.

Genes to Cells : Devoted to Molecular & Cellular Mechanisms
|October 24, 2006
PubMed
Summary
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Cytoplasmic c-Ski protein can inhibit transforming growth factor-beta (TGF-beta) signaling, but its nuclear function is lost. Proteasome activity regulates c-Ski

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Oncogenesis

Background:

  • c-Ski, a proto-oncogene product, drives cellular changes like transformation and differentiation.
  • c-Ski inhibits transforming growth factor-beta (TGF-beta) superfamily signaling by interacting with Smad proteins.
  • While typically nuclear, c-Ski exhibits aberrant cytoplasmic localization in some cancers.

Purpose of the Study:

  • To investigate the functional consequences of cytoplasmic c-Ski.
  • To identify the nuclear localization signal (NLS) of c-Ski.
  • To explore the regulation of c-Ski's subcellular localization.

Main Methods:

  • Site-directed mutagenesis to abolish the identified NLS in c-Ski.
  • Assessing TGF-beta/Smad signaling pathway activity in cells expressing wild-type and mutant c-Ski.

Related Experiment Videos

  • Analyzing c-Ski localization under conditions of inhibited proteasome activity.

    • Main Results:

    • Cytoplasmic c-Ski sequesters activated Smad complexes, inhibiting TGF-beta signaling.
    • Nuclear-dependent functions, such as Smad7 gene transcription suppression, are lost with cytoplasmic c-Ski.
    • Proteasome inhibition leads to cytoplasmic accumulation of c-Ski, involving specific amino acid regions.

    Conclusions:

    • Subcellular localization critically impacts c-Ski's biological activities.
    • c-Ski's localization is potentially regulated by proteasome-dependent mechanisms.
    • Understanding c-Ski localization offers insights into its oncogenic functions and TGF-beta pathway regulation.