The effect of hydrogen peroxide on the cyclin D expression in fibroblasts.
Activation of mitogen-activated protein (MAP) kinase is essential for cyclin D1 expression and provides a link between mitogenic signalling and cell cycle progression. Hydrogen peroxide (H2O2) activates MAP kinase; however, it is not known whether this leads to cyclin D expression. Sustained expression of cyclin D1 and D2 was observed when Her14 fibroblasts were incubated with 3 mM or higher H2O2 concentrations. Similar results were obtained when cells were incubated in the presence of serum (FCS). However, the sustained expression of cyclin D1 and D2 upon H2O2 treatment was not due to the MAP kinase pathway, because MAP kinase kinase inhibitors did not inhibit cyclin D expression. Furthermore, cyclin D1 and D2 levels remained constant even after addition of a protein synthesis inhibitor, indicating that the effect of H2O2 was not due to induction of protein synthesis. These results indicate that H2O2 reversibly inhibits the ubiquitin-proteasome dependent degradation of cyclin D1 and D2, probably by transiently inhibiting ubiquitination and/or the proteasome.
Martínez Muñoz
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Institute of Biomembranes, Department of Molecular Cell Biology, Utrecht University, The Netherlands. C.Martinez-Munoz@bio.uu.nl
Post
J A
JA
Verkleij
A J
AJ
Verrips
C T
CT
Boonstra
J
J
D016475:3T3 Cells; D000818:Animals; D019938:Cyclin D1 / Q000096:biosynthesis / Q000378:metabolism*; D056742:Cyclin D2; D016213:Cyclins / Q000096:biosynthesis / Q000378:metabolism*; D003546:Cysteine Endopeptidases; D015853:Cysteine Proteinase Inhibitors / Q000494:pharmacology; D005347:Fibroblasts / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D006801:Humans; D006861:Hydrogen Peroxide / Q000378:metabolism* / Q000494:pharmacology; D007976:Leupeptins / Q000494:pharmacology; D051379:Mice; D020928:Mitogen-Activated Protein Kinases / Q000037:antagonists & inhibitors / Q000378:metabolism / Q000502:physiology; D009097:Multienzyme Complexes / Q000037:antagonists & inhibitors*; D046988:Proteasome Endopeptidase Complex; D011500:Protein Synthesis Inhibitors / Q000494:pharmacology; D012710:Serum Albumin, Bovine / Q000494:pharmacology; D015398:Signal Transduction
C080336:CCND2 protein, human; C486196:Ccnd2 protein, mouse; D056742:Cyclin D2; D016213:Cyclins; D015853:Cysteine Proteinase Inhibitors; D007976:Leupeptins; D009097:Multienzyme Complexes; D011500:Protein Synthesis Inhibitors; D019938:Cyclin D1; D012710:Serum Albumin, Bovine; D006861:Hydrogen Peroxide; D020928:Mitogen-Activated Protein Kinases; D003546:Cysteine Endopeptidases; D046988:Proteasome Endopeptidase Complex; C072553:benzyloxycarbonylleucyl-leucyl-leucine aldehyde