title: Oxidative modification and down-regulation of Pin1 in Alzheimer's disease hippocampus: A redox proteomics analysis.
abstract: Alzheimer disease (AD) is characterized neuropathologically by intracellular neurofibrillary tangles (NFT) and of extracellular senile plaques (SP), the central core of which is amyloid beta-peptide (Abeta) derived from amyloid precursor protein (APP), a transmembrane protein. AD brain has been reported to be under oxidative stress that may play an important role in the pathogenesis and progression of AD. The present proteomics study is focused on identification of a specific target of protein oxidation in AD hippocampus that has relevance to the role of oxidative stress in AD. Here, we report that the protein, Pin1, is significantly down-regulated and oxidized in AD hippocampus. The identity of Pin1 was confirmed immunochemically. Analysis of Pin1 activity in AD brain and separately as oxidized pure Pin1 demonstrated that oxidation of Pin1 led to loss of activity. Pin1 has been implicated in multiple aspects of cell cycle regulation and dephosphorylation of tau protein as well as in AD. The in vivo oxidative modification of Pin1 as found by proteomics in AD hippocampus in the present study suggests that oxidative modification may be related to the known loss of Pin1 isomerase activity that could be crucial in AD neurofibrillary pathology. Taken together, these results provide evidence supporting a direct link between oxidative damage to neuronal Pin1 and the pathobiology of AD.
authors.affiliation: Department of Chemistry, University of Kentucky, Lexington, KY 40506, USA.
authors.forename: Rukhsana
authors.initials: R
authors.lastname: Sultana
authors.forename: Debra
authors.initials: D
authors.lastname: Boyd-Kimball
authors.forename: H Fai
authors.initials: HF
authors.lastname: Poon
authors.forename: Jain
authors.initials: J
authors.lastname: Cai
authors.forename: William M
authors.initials: WM
authors.lastname: Pierce
authors.forename: Jon B
authors.initials: JB
authors.lastname: Klein
authors.forename: William R
authors.initials: WR
authors.lastname: Markesbery
authors.forename: Xiao Zhen
authors.initials: XZ
authors.lastname: Zhou
authors.forename: Kun Ping
authors.initials: KP
authors.lastname: Lu
authors.forename: D Allan
authors.initials: DA
authors.lastname: Butterfield
mesh_terms: D000369:Aged, 80 and over; D000544:Alzheimer Disease / Q000378:metabolism* / Q000503:physiopathology; D015536:Down-Regulation / Q000502:physiology*; D005260:Female; D006624:Hippocampus / Q000378:metabolism* / Q000503:physiopathology; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D000072340:NIMA-Interacting Peptidylprolyl Isomerase; D016874:Neurofibrillary Tangles / Q000378:metabolism; D010084:Oxidation-Reduction; D018384:Oxidative Stress / Q000502:physiology*; D019696:Peptidylprolyl Isomerase / Q000378:metabolism*; D010766:Phosphorylation; D011499:Protein Processing, Post-Translational / Q000502:physiology; D040901:Proteomics; D016875:tau Proteins / Q000378:metabolism
chemical_list: D000072340:NIMA-Interacting Peptidylprolyl Isomerase; D016875:tau Proteins; C000606846:PIN1 protein, human; D019696:Peptidylprolyl Isomerase