14-3-3 proteins are involved in the regulation of mammalian cell proliferation

Amino Acids. 2006 Feb;30(1):105-9. doi: 10.1007/s00726-005-0240-7. Epub 2005 Aug 24.

Abstract

The 14-3-3 proteins are a family of abundant, widely expressed acidic polypeptides. The seven isoforms interact with over 70 different proteins. 14-3-3 isoforms have been demonstrated to be involved in the control of positive as well as negative regulators of mammalian cell proliferation. Here we used the approach of inactivating 14-3-3 protein functions via overexpression of dominant negative mutants to analyse the role of 14-3-3 proteins in mammalian cell proliferation. We found 14-3-3 dominant negative mutants to downregulate the proliferation rates of HeLa cells. Overexpression of these dominant negative mutants triggers upregulation of the protein levels of the cyclin-dependent kinase inhibitor p27, a major negative cell cycle regulator. In addition, they downregulate the protein levels of the important cell cycle promoter cyclin D1. These data provide new insights into mammalian cell proliferation control and allow a better understanding of the functions of 14-3-3 proteins.

MeSH terms

  • 14-3-3 Proteins / antagonists & inhibitors
  • 14-3-3 Proteins / genetics
  • 14-3-3 Proteins / metabolism*
  • Cell Cycle
  • Cell Proliferation*
  • HeLa Cells
  • Humans
  • Mutation
  • Protein Isoforms / antagonists & inhibitors
  • Protein Isoforms / genetics
  • Protein Isoforms / metabolism
  • Transfection
  • Tuberous Sclerosis Complex 1 Protein
  • Tuberous Sclerosis Complex 2 Protein
  • Tumor Suppressor Proteins / genetics

Substances

  • 14-3-3 Proteins
  • Protein Isoforms
  • Tuberous Sclerosis Complex 1 Protein
  • Tuberous Sclerosis Complex 2 Protein
  • Tumor Suppressor Proteins