title: The inhalation anesthetic desflurane induces caspase activation and increases amyloid beta-protein levels under hypoxic conditions.
abstract: Perioperative factors including hypoxia, hypocapnia, and certain anesthetics have been suggested to contribute to Alzheimer disease (AD) neuropathogenesis. Desflurane is one of the most commonly used inhalation anesthetics. However, the effects of desflurane on AD neuropathogenesis have not been previously determined. Here, we set out to assess the effects of desflurane and hypoxia on caspase activation, amyloid precursor protein (APP) processing, and amyloid beta-protein (Abeta) generation in H4 human neuroglioma cells (H4 naïve cells) as well as those overexpressing APP (H4-APP cells). Neither 12% desflurane nor hypoxia (18% O(2)) alone affected caspase-3 activation, APP processing, and Abeta generation. However, treatment with a combination of 12% desflurane and hypoxia (18% O(2)) (desflurane/hypoxia) for 6 h induced caspase-3 activation, altered APP processing, and increased Abeta generation in H4-APP cells. Desflurane/hypoxia also increased levels of beta-site APP-cleaving enzyme in H4-APP cells. In addition, desflurane/hypoxia-induced Abeta generation could be reduced by the broad caspase inhibitor benzyloxycarbonyl-VAD. Finally, the Abeta aggregation inhibitor clioquinol and gamma-secretase inhibitor L-685,458 attenuated caspase-3 activation induced by desflurane/hypoxia. In summary, desflurane can induce Abeta production and caspase activation, but only in the presence of hypoxia. Pending in vivo confirmation, these data may have profound implications for anesthesia care in elderly patients, and especially those with AD.
authors.affiliation: Genetics and Aging Research Unit, MassGeneral Institute for Neurodegenerative Disease, Department of Neurology, Massachusetts General Hospital, Harvard Medical School, Charlestown, Massachusetts 02129-2060, USA.
authors.forename: Bin
authors.initials: B
authors.lastname: Zhang
authors.forename: Yuanlin
authors.initials: Y
authors.lastname: Dong
authors.forename: Guohua
authors.initials: G
authors.lastname: Zhang
authors.forename: Robert D
authors.initials: RD
authors.lastname: Moir
authors.forename: Weiming
authors.initials: W
authors.lastname: Xia
authors.forename: Yun
authors.initials: Y
authors.lastname: Yue
authors.forename: Ming
authors.initials: M
authors.lastname: Tian
authors.forename: Deborah J
authors.initials: DJ
authors.lastname: Culley
authors.forename: Gregory
authors.initials: G
authors.lastname: Crosby
authors.forename: Rudolph E
authors.initials: RE
authors.lastname: Tanzi
authors.forename: Zhongcong
authors.initials: Z
authors.lastname: Xie
mesh_terms: D053829:Amyloid Precursor Protein Secretases / Q000378:metabolism; D016229:Amyloid beta-Peptides / Q000737:chemistry / Q000378:metabolism*; D018685:Anesthetics, Inhalation / Q000494:pharmacology*; D016282:Aspartic Acid Endopeptidases / Q000378:metabolism; D002219:Carbamates / Q000494:pharmacology; D053148:Caspase 3 / Q000378:metabolism*; D061945:Caspase Inhibitors; D015687:Cell Hypoxia / Q000187:drug effects; D045744:Cell Line, Tumor; D007464:Clioquinol / Q000494:pharmacology; D000077335:Desflurane; D004151:Dipeptides / Q000494:pharmacology; D004789:Enzyme Activation / Q000187:drug effects; D006801:Humans; D007530:Isoflurane / Q000031:analogs & derivatives* / Q000494:pharmacology; D008954:Models, Biological; D009842:Oligopeptides / Q000494:pharmacology; D011499:Protein Processing, Post-Translational / Q000187:drug effects; D020836:Protein Structure, Quaternary
chemical_list: D016229:Amyloid beta-Peptides; D018685:Anesthetics, Inhalation; D002219:Carbamates; D061945:Caspase Inhibitors; D004151:Dipeptides; C410009:L 685458; D009842:Oligopeptides; C517629:benzyloxycarbonyl-valyl-alanyl-aspartic acid; D007464:Clioquinol; D000077335:Desflurane; D007530:Isoflurane; D053829:Amyloid Precursor Protein Secretases; D053148:Caspase 3; D016282:Aspartic Acid Endopeptidases; C509280:BACE1 protein, human