title: Regulation of PMP22 mRNA by G3BP1 affects cell proliferation in breast cancer cells.
abstract: BACKGROUND
  Regulation of mRNAs is one way to control protein levels and thereby important cellular processes such as growth, invasion and apoptosis. G3BPs constitute a family of mRNA-binding proteins, shown to be overexpressed in several cancer types, including breast, colon and pancreas cancer. G3BP has been reported to both stabilize and induce degradation of specific mRNAs.
  
  
  RESULTS
  Here, we show that G3BP1, but not G3BP2, supports proliferation of several breast cancer cell lines. Global gene expression analyses of G3BP1- and G3BP2-depleted cells indicate that primarily G3BP1, and much less G3BP2, influences mRNA expression levels. Peripheral myelin protein 22 (PMP22) was one gene that was significantly influenced by G3BP1 depletion which led to a 2-3 fold increased expression. Depletion of PMP22 resulted in increased proliferation and the G3BP1-mediated effect on proliferation was not seen upon PMP22-depletion.
  
  
  CONCLUSIONS
  This indicates a novel role for G3BP1 in the regulation of cell proliferation in breast cancer cells, perhaps via a regulatory effect on PMP22 expression.
authors: Sofia
authors: S
authors: Winslow
authors: Karin
authors: K
authors: Leandersson
authors: Department of Laboratory Medicine, Translational Cancer Research, Lund University, Medicon Village, Building 404:C3, Lund, 223 81, Sweden. Christer.Larsson@med.lu.se.
authors: Christer
authors: C
authors: Larsson
mesh_terms: D000903:Antibiotics, Antineoplastic / Q000494:pharmacology; D001943:Breast Neoplasms; D002352:Carrier Proteins / Q000502:physiology*; D049109:Cell Proliferation; D002470:Cell Survival; D004265:DNA Helicases; D003609:Dactinomycin / Q000494:pharmacology; D005260:Female; D055785:Gene Knockdown Techniques; D006801:Humans; D061986:MCF-7 Cells; D009185:Myelin Proteins / Q000235:genetics* / Q000378:metabolism; D000075223:Poly-ADP-Ribose Binding Proteins; D020365:RNA Helicases; D000067776:RNA Recognition Motif Proteins; D020871:RNA Stability; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism
chemical_list: D000903:Antibiotics, Antineoplastic; D002352:Carrier Proteins; D009185:Myelin Proteins; C073687:PMP22 protein, human; D000075223:Poly-ADP-Ribose Binding Proteins; D000067776:RNA Recognition Motif Proteins; D012333:RNA, Messenger; D003609:Dactinomycin; D004265:DNA Helicases; C116070:G3BP1 protein, human; D020365:RNA Helicases