title: Proteasome inhibition by MG-132 induces apoptotic cell death and mitochondrial dysfunction in cultured rat brain oligodendrocytes but not in astrocytes.
abstract: Proteasomal dysfunction has been implicated in neurodegenerative disorders and during aging processes. In frontotemporal dementias, corticobasal degeneration, and progressive supranuclear palsy, oligodendrocytes are specifically damaged. Application of proteasomal inhibitors to cultured oligodendrocytes is associated with apoptotic cell death. The present study was undertaken to investigate the death pathway activated in oligodendrocytes by proteasomal inhibition. Our data show that the proteasomal inhibitor MG-132 causes oxidative stress, as indicated by the upregulation of the small heat shock protein heme oxygenase-1 (HO-1) and the appearance of oxidized proteins. Activation of the mitochondrial pathway was involved in the apoptotic process. Mitochondrial membrane potential was disturbed, and cytochrome c was released from the mitochondria. Concomitantly, death-related caspases 3 and 9 were activated and poly(ADP-ribose)-polymerase cleavage occurred. MG-132-induced cell death, DNA-fragmentation, and caspase activation could be prevented by the broad caspase inhibitor zVAD-fmk. In contrast to oligodendrocytes, cultured astrocytes showed resistance to the treatment with proteasomal inhibitors and did not reveal cytotoxic responses. This was also observed in astrocytes differentiated in the presence of dibutyryl cyclic AMP. Hence, individual cells respond differently to proteasomal inhibition and the therapeutic use of proteasomal inhibitors, e.g. for the treatment of cancer or inflammatory diseases, needs to be carefully evaluated.
authors.affiliation: Department of Biology, Molecular Neurobiology, University of Oldenburg, Oldenburg, Germany.
authors.forename: Olaf
authors.initials: O
authors.lastname: Goldbaum
authors.forename: Grit
authors.initials: G
authors.lastname: Vollmer
authors.forename: Christiane
authors.initials: C
authors.lastname: Richter-Landsberg
mesh_terms: D000590:Amino Acid Chloromethyl Ketones / Q000494:pharmacology; D000818:Animals; D000831:Animals, Newborn; D017209:Apoptosis / Q000187:drug effects / Q000502:physiology*; D001253:Astrocytes / Q000187:drug effects / Q000378:metabolism* / Q000473:pathology; D001921:Brain / Q000378:metabolism* / Q000503:physiopathology; D003994:Bucladesine / Q000494:pharmacology; D020169:Caspases / Q000187:drug effects / Q000378:metabolism; D002478:Cells, Cultured; D015853:Cysteine Proteinase Inhibitors / Q000494:pharmacology; D045304:Cytochromes c / Q000378:metabolism; D004791:Enzyme Inhibitors / Q000494:pharmacology; D051547:Heme Oxygenase-1 / Q000187:drug effects / Q000378:metabolism; D007976:Leupeptins / Q000494:pharmacology; D008928:Mitochondria / Q000187:drug effects / Q000378:metabolism* / Q000473:pathology; D051336:Mitochondrial Membranes / Q000187:drug effects / Q000378:metabolism; D019636:Neurodegenerative Diseases / Q000378:metabolism / Q000503:physiopathology; D009836:Oligodendroglia / Q000187:drug effects / Q000378:metabolism* / Q000473:pathology; D018384:Oxidative Stress / Q000187:drug effects / Q000502:physiology; D011065:Poly(ADP-ribose) Polymerases / Q000187:drug effects / Q000378:metabolism; D046988:Proteasome Endopeptidase Complex / Q000378:metabolism*; D061988:Proteasome Inhibitors; D051381:Rats; D017208:Rats, Wistar
chemical_list: D000590:Amino Acid Chloromethyl Ketones; D015853:Cysteine Proteinase Inhibitors; D004791:Enzyme Inhibitors; D007976:Leupeptins; D061988:Proteasome Inhibitors; C096713:benzyloxycarbonylvalyl-alanyl-aspartyl fluoromethyl ketone; D003994:Bucladesine; D045304:Cytochromes c; C496541:HMOX1 protein, human; D051547:Heme Oxygenase-1; D011065:Poly(ADP-ribose) Polymerases; D020169:Caspases; D046988:Proteasome Endopeptidase Complex; C072553:benzyloxycarbonylleucyl-leucyl-leucine aldehyde