G3BP is overexpressed in human tumors and promotes S phase entry

Cancer Lett. 2001 Jan 26;162(2):213-21. doi: 10.1016/s0304-3835(00)00638-8.


The expression of the human Ras-GTPase activating protein (GAP)-binding protein (G3BP) was studied in human tumors and cell lines of different origins. Northern blot analysis and immunoblotting experiments showed enhanced expression of G3BP in all tumor samples as compared to healthy tissue. The enhanced expression does not seem to be related to the tumor site or to the stage of development of the cancer. In light of the proposed functions of G3BP, its increased expression in tumors suggest that it plays a role in dedifferentiation and proliferation processes. We also show that G3BP promotes S phase entry in cultured fibroblasts deprived of serum and that this function is dependent on the presence of the RNA binding domain of the protein.

MeSH terms

  • 3T3 Cells / cytology
  • 3T3 Cells / metabolism
  • Animals
  • Blotting, Northern
  • Blotting, Southern
  • Blotting, Western
  • Carrier Proteins / biosynthesis*
  • Carrier Proteins / genetics
  • Carrier Proteins / physiology
  • DNA Helicases
  • Disease Progression
  • Humans
  • Keratinocytes / cytology
  • Keratinocytes / metabolism
  • Mice
  • Neoplasms / metabolism*
  • Neoplasms / pathology*
  • Poly-ADP-Ribose Binding Proteins
  • RNA Helicases
  • RNA Recognition Motif Proteins
  • RNA-Binding Proteins / biosynthesis
  • RNA-Binding Proteins / genetics
  • RNA-Binding Proteins / physiology
  • S Phase / physiology*
  • Transfection
  • Tumor Cells, Cultured


  • Carrier Proteins
  • Poly-ADP-Ribose Binding Proteins
  • RNA Recognition Motif Proteins
  • RNA-Binding Proteins
  • DNA Helicases
  • G3BP1 protein, human
  • G3bp1 protein, mouse
  • RNA Helicases