The relationship between Alzheimers Disease, aging and altered calcium disposition is currently a topic of great discussion. The present project is designed to characterize alterations in free radical production, protein oxidation, enzymatic activity, protein-protein interactions and modifications in calcium buffering capacity of mitochondria. Mitochondria are a major intracellular source and sink for calcium within the neuron. Alterations in the metabolic status and transport capability of mitochondria could significantly influence the ability of the cell to regulate intracellular calcium levels. Alterations of intracellular calcium levels could result in significant dysfunction due to the critical regulation of local calcium concentrations with respect to activation of wide variety of calcium dependent enzymes. Since mitochondria are likely to function as local regulators of the cytosolic concentration of calcium on a moment to moment basis, mitochondria damage becomes a crucial determinant of the calcium homeostatic potential of a neuron. Age related changes in mitochondrial glutathione levels, mitochondrial transport of calcium and cytosolic enzymatic activity and protein-protein interaction will be determined in the first portion of this project. In the second portion, in vivo and in vitro oxidative damage to mitochondria and other components of the cell will be characterized. In the last series of experiments, the beneficial effects of chronic exposure to a free radical spin-trapping compound (PBN) will be determined. In previous studies it has been demonstrated that daily administration of PBN for a period of 14 days will significantly reduce the level of oxidized protein within the brain and return to normal the level of glutamine synthetase activity, a marker for oxidative damage to enzymes within the cell. It is hypothesized that the chronic administration of a spin-trapping compound will significantly reduce the oxidative stress to the neurons as they age and thereby, improve the survivability of the neurons. In summary, the current proposal is designed to characterize the critical role of intracellular calcium buffering capacity on protein oxidation, loss of protein-protein interaction and inability of mitochondria to buffer calcium. This loss of calcium buffering potential may be pivotable in the process of age related cellular dysfunction, not only to the normal process of aging but also in the pathological aging associated with Alzheimers Disease.

Agency
National Institute of Health (NIH)
Institute
National Institute on Aging (NIA)
Type
Research Program Projects (P01)
Project #
5P01AG010836-05
Application #
5204852
Study Section
Project Start
Project End
Budget Start
Budget End
Support Year
5
Fiscal Year
1996
Total Cost
Indirect Cost
Butterfield, D Allan; Palmieri, Erika M; Castegna, Alessandra (2016) Clinical implications from proteomic studies in neurodegenerative diseases: lessons from mitochondrial proteins. Expert Rev Proteomics 13:259-74
Chen, Chun-Hau; Li, Wenzong; Sultana, Rukhsana et al. (2015) Pin1 cysteine-113 oxidation inhibits its catalytic activity and cellular function in Alzheimer's disease. Neurobiol Dis 76:13-23
Barone, Eugenio; Di Domenico, Fabio; Butterfield, D Allan (2014) Statins more than cholesterol lowering agents in Alzheimer disease: their pleiotropic functions as potential therapeutic targets. Biochem Pharmacol 88:605-16
Cenini, Giovanna; Fiorini, Ada; Sultana, Rukhsana et al. (2014) An investigation of the molecular mechanisms engaged before and after the development of Alzheimer disease neuropathology in Down syndrome: a proteomics approach. Free Radic Biol Med 76:89-95
Barone, Eugenio; Di Domenico, Fabio; Mancuso, Cesare et al. (2014) The Janus face of the heme oxygenase/biliverdin reductase system in Alzheimer disease: it's time for reconciliation. Neurobiol Dis 62:144-59
Förster, Sarah; Welleford, Andrew S; Triplett, Judy C et al. (2014) Increased O-GlcNAc levels correlate with decreased O-GlcNAcase levels in Alzheimer disease brain. Biochim Biophys Acta 1842:1333-9
Swomley, Aaron M; Förster, Sarah; Keeney, Jierel T et al. (2014) Abeta, oxidative stress in Alzheimer disease: evidence based on proteomics studies. Biochim Biophys Acta 1842:1248-57
Latimer, Caitlin S; Brewer, Lawrence D; Searcy, James L et al. (2014) Vitamin D prevents cognitive decline and enhances hippocampal synaptic function in aging rats. Proc Natl Acad Sci U S A 111:E4359-66
Butterfield, D Allan; Di Domenico, Fabio; Barone, Eugenio (2014) Elevated risk of type 2 diabetes for development of Alzheimer disease: a key role for oxidative stress in brain. Biochim Biophys Acta 1842:1693-706
Perluigi, Marzia; Di Domenico, Fabio; Buttterfield, D Allan (2014) Unraveling the complexity of neurodegeneration in brains of subjects with Down syndrome: insights from proteomics. Proteomics Clin Appl 8:73-85

Showing the most recent 10 out of 356 publications