Research Topics
Genomes and Genes | J N KellerSummaryAffiliation: University of Kentucky Country: USA Publications
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Publications
The many nuances of oxidative stress and proteolysisJeffrey N Keller
Antioxid Redox Signal 8:119-20. 2006
Oxidized lipoproteins increase reactive oxygen species formation in microglia and astrocyte cell linesJ N Keller
Sanders Brown Center on Aging, University of Kentucky, 101 Sanders Brown Building, Lexington, KY, 40536 0230, USA
Brain Res 830:10-5. 1999....
Evidence of increased oxidative damage in subjects with mild cognitive impairmentJ N Keller
Department of Anatomy, University of Kentucky, Lexington 40536 0230, USA
Neurology 64:1152-6. 2005..To determine if increased levels of oxidative damage are present in the brains of persons with mild cognitive impairment (MCI), a condition that often precedes Alzheimer disease (AD)...
Age-related neuropathology, cognitive decline, and Alzheimer's diseaseJeffrey N Keller
Department of Anatomy and Neurobiology and Sanders Brown Center on Aging, University of Kentucky, 800 South Limestone, Lexington, KY 40536 0230, USA
Ageing Res Rev 5:1-13. 2006....
Autophagy, proteasomes, lipofuscin, and oxidative stress in the aging brainJeffrey N Keller
203 Sanders Brown Center on Aging, University of Kentucky, Lexington, KY 40536 0230, USA
Int J Biochem Cell Biol 36:2376-91. 2004....
The proteasome in brain agingJeffrey N Keller
Department of Anatomy and Neurobiology, University of Kentucky, Lexington, KY 40536 0230, USA
Ageing Res Rev 1:279-93. 2002....
Dopamine induces proteasome inhibition in neural PC12 cell lineJ N Keller
Sanders Brown Center on Aging, University of Kentucky, Lexington, KY 40536 0230, USA
Free Radic Biol Med 29:1037-42. 2000..Together, these data indicate that dopamine induces proteasome inhibition that is dependent, in part, on ROS and dopamine uptake, and suggest a possible role for proteasome inhibition in dopamine toxicity...
Anti-death properties of TNF against metabolic poisoning: mitochondrial stabilization by MnSODA J Bruce-Keller
Sanders Brown Research Center on Aging, Department of Anatomy and Neurobiology, University of Kentucky, Lexington 40536 0230, USA
J Neuroimmunol 93:53-71. 1999..Additional studies showed that levels of oxidative stress and striatal lesion size following 3-NP administration in vivo are increased in mice lacking TNF receptors...
Vulnerability of synaptosomes from apoE knock-out mice to structural and oxidative modifications induced by A beta(1-40): implications for Alzheimer's diseaseC M Lauderback
Department of Chemistry, Center of Membrane Sciences, and Sanders-Brown Center on Aging, University of Kentucky, Lexington, Kentucky 40506, USA
Biochemistry 40:2548-54. 2001..Together, these data support a role for apoE in the modulation of oxidative injury and in the maintenance of synaptic integrity and are discussed with reference to alterations in AD brain...
Proteasome inhibition in oxidative stress neurotoxicity: implications for heat shock proteinsQ Ding
Department of Anatomy and Neurobiology, University of Kentucky, Lexington, Kentucky, USA
J Neurochem 77:1010-7. 2001....
4-hydroxynonenal increases neuronal susceptibility to oxidative stressJ N Keller
Sanders Brown Center on Aging, University of Kentucky, Lexington 40536 0230, USA
J Neurosci Res 58:823-30. 1999..In addition, the present study indicates a possible mechanism for reactive oxygen species and lipid peroxidation toxicity in neurodegenerative conditions...
Antiinflammatory effects of estrogen on microglial activationA J Bruce-Keller
Department of Anatomy and Neurobiology, University of Kentucky, Lexington 40536, USA
Endocrinology 141:3646-56. 2000..These results describe a novel mechanism by which estrogen may attenuate the progression of neurodegenerative disease and suggest new pathways for therapeutic intervention in clinical settings...
The glial glutamate transporter, GLT-1, is oxidatively modified by 4-hydroxy-2-nonenal in the Alzheimer's disease brain: the role of Abeta1-42C M Lauderback
Department of Chemistry, and Center of Membrane Sciences, University of Kentucky, Lexington, Kentucky, USA
J Neurochem 78:413-6. 2001..Furthermore, our data suggests that Abeta may be a possible causative agent in this cascade...
Oxidative stress-associated impairment of proteasome activity during ischemia-reperfusion injuryJ N Keller
Sanders Bronwn Research Center on Aging, Department of Biochemistry, University of Kentucky, Lexington 40536 0230, USA
J Cereb Blood Flow Metab 20:1467-73. 2000..Together, these data indicate that proteasome inhibition occurs during cerebral ischemia-reperfusion injury and is mediated, at least in part, by oxidative stress...
Proteasomes and proteasome inhibition in the central nervous systemQ Ding
Department of Anatomy, University of Kentucky, Lexington, KY, USA
Free Radic Biol Med 31:574-84. 2001..The focus of this review is to describe what is currently known about proteasome biology in the central nervous system and to discuss the possible role of proteasome inhibition in the neurodegenerative process...
Lysophosphatidic acid induction of neuronal apoptosis and necrosisM R Steiner
Department of Microbiology and Immunology, University of Kentucky, Lexington 40536, USA
Ann N Y Acad Sci 905:132-41. 2000..Thus, LPA-induced neuronal apoptosis is associated with mitochondrial alterations, the generation of reactive oxygen species and nitric oxide, and protection by pretreatment with a serum constituent, insulin-like growth factor 1...
Amyloid beta-peptide effects on synaptosomes from apolipoprotein E-deficient miceJ N Keller
Sanders Brown Center on Aging, University of Kentucky, Lexington 40536 0230, USA
J Neurochem 74:1579-86. 2000..Together, these data are consistent with a role for apoE in maintaining homeostasis by attenuating oxidative stress, caspase activation, and mitochondrial homeostasis in synapses...
Pro-inflammatory and pro-oxidant properties of the HIV protein Tat in a microglial cell line: attenuation by 17 beta-estradiolA J Bruce-Keller
Department of Anatomy, University of Kentucky, Lexington, Kentucky, USA
J Neurochem 78:1315-24. 2001..Together, these data elucidate specific components of the microglial response to Tat and suggest that Tat could contribute to the neuropathology associated with HIV infection through microglial promulgation of oxidative stress...
Ribosome dysfunction is an early event in Alzheimer's diseaseQunxing Ding
Department of Anatomy and Neurobiology, University of Kentucky, Lexington, Kentucky 40536-0230, USA
J Neurosci 25:9171-5. 2005....
Ump1 extends yeast lifespan and enhances viability during oxidative stress: central role for the proteasome?Qinghua Chen
Sanders Brown Center on Aging, Department of Anatomy and Neurobiology, University of Kentucky, Lexington, KY 40536 0230, USA
Free Radic Biol Med 40:120-6. 2006..Taken together these data strongly support a role for the proteasome serving as a central regulator of cellular viability during oxidative stress and during aging...
Mutations in amyloid precursor protein and presenilin-1 genes increase the basal oxidative stress in murine neuronal cells and lead to increased sensitivity to oxidative stress mediated by amyloid beta-peptide (1-42), HO and kainic acid: implications for Hafiz Mohmmad Abdul
Department of Chemistry and Center of Membrane Sciences, University of Kentucky, Lexington, Kentucky 40506, USA
J Neurochem 96:1322-35. 2006..The results are consonant with the hypothesis that Abeta(1-42)-associated oxidative stress and increased vulnerability to oxidative stress may contribute significantly to neuronal apoptosis and death in familial early onset AD...
LMP2 knock-out mice have reduced proteasome activities and increased levels of oxidatively damaged proteinsQunxing Ding
Department of Anatomy and Neurobiology, University of Kentucky, Lexington, Kentucky 40536, USA
Antioxid Redox Signal 8:130-5. 2006..Results from this study demonstrate for the first time that individual proteasome subunits are important for the regulation of age-related changes in both proteasome activity and protein oxidation...
Proteasome regulation of oxidative stress in aging and age-related diseases of the CNSQunxing Ding
Sanders-Brown Center on Aging, Department of Anatomy and Neurobiology, University of Kentucky, Lexington, Kentucky 40536-0230, USA
Antioxid Redox Signal 8:163-72. 2006..Additionally we discuss the likelihood that the 20S proteasome and 26S proteasome may play different roles in regulating oxidative stress and neurotoxicity in the aging CNS, and in age-related disorders of the CNS...
Decreased RNA, and increased RNA oxidation, in ribosomes from early Alzheimer's diseaseQunxing Ding
Anatomy and Neurobiology, University of Kentucky, 205 Sanders-Brown Center on Aging, Lexington, KY 40536-0230, USA
Neurochem Res 31:705-10. 2006..Together, these data strongly suggest a role for RNA alterations within the ribosome as a mediator of decreased protein synthesis in both MCI and AD...
Age-related alterations of Apolipoprotein E and interleukin-1beta in the aging brainJillian R Gee
Department of Anatomy and Neurobiology, University of Kentucky, Lexington, KY 40536 0230, USA
Biogerontology 7:69-79. 2006..Taken together, these studies demonstrate that ApoE expression is not altered during normal brain aging, but suggest that there may be a relationship between ApoE and IL-1beta transcription in the cerebral cortex...
Aging and dietary restriction effects on ubiquitination, sumoylation, and the proteasome in the heartFeng Li
Sanders Brown Center on Aging, University of Kentucky, Lexington, KY, USA
Mech Ageing Dev 129:515-21. 2008....
Amyloid peptides in different assembly states and related effects on isolated and cellular proteasomesValentina Cecarini
Department of Molecular, Cellular and Animal Biology, University of Camerino, 62032 Camerino MC, Italy
Brain Res 1209:8-18. 2008..Furthermore, the altered proteasome functionality is not associated with a decrease in cell viability, but is linked with increased levels of protein oxidation...
Oxidative stress alters neuronal RNA- and protein-synthesis: Implications for neural viabilityQunxing Ding
Anatomy and Neurobiology, University of Kentucky, Lexington, KY 40536 0230, USA
Free Radic Res 41:903-10. 2007..These data also suggest that there is a complex relationship between the ability of oxidative stressors to modulate RNA- and protein-synthesis, and the ability of oxidative stressors to ultimately induce neuron death...
Abeta solubility and deposition during AD progression and in APPxPS-1 knock-in miceM Paul Murphy
Department of Molecular and Cellular Biochemistry, Sanders Brown Center on Aging, University of Kentucky, Lexington, Kentucky 40536 0230, USA
Neurobiol Dis 27:301-11. 2007..These data suggest that distinct changes in Abeta occur throughout the progression of AD, and that elevations in Abeta42 occur at an early, clinically defined stage...
RNA in brain disease: no longer just "the messenger in the middle"Peter T Nelson
Department of Pathology and Division of Neuropathology, University of Kentucky, Sanders Brown Center on Aging, Lexington, Kentucky 40536 0230, USA
J Neuropathol Exp Neurol 66:461-8. 2007....
Oxidative inactivation of the proteasome in Alzheimer's diseaseValentina Cecarini
Sanders Brown Center on Aging, University of Kentucky, Lexington, KY 40536 0230, USA
Free Radic Res 41:673-80. 2007..Together, these data confirm that impairments in the function of purified proteasomes occurs in the earliest stages of AD, and directly support a role for oxidative inactivation contributing to declines in proteasome function in AD...
Elevated levels of 3-nitrotyrosine in brain from subjects with amnestic mild cognitive impairment: implications for the role of nitration in the progression of Alzheimer's diseaseD Allan Butterfield
Department of Chemistry, University of Kentucky, Lexington, KY 40506, USA
Brain Res 1148:243-8. 2007..Immunohistochemistry analysis of hippocampus confirmed this result. These findings suggest that nitrosative damage occurs early in the course of MCI, and that protein nitration may be important for conversion of MCI to AD...
Oxidative damage, protein synthesis, and protein degradation in Alzheimer's diseaseQunxing Ding
Anatomy and Neurobiology, Sanders Brown Center on Aging, University of Kentucky, Lexington KY 40536, USA
Curr Alzheimer Res 4:73-9. 2007....
Protein oxidation and cellular homeostasis: Emphasis on metabolismValentina Cecarini
Post Graduate School of Clinical Biochemistry, Departments of Molecular and Cellular and Animal Biology, University of Camerino, Camerino, Italy
Biochim Biophys Acta 1773:93-104. 2007..Together, this review describes a potential role for elevated levels of protein oxidation contributing to cellular dysfunction and oxidative stress via impacts on cellular metabolism...
Alpha-synuclein alters proteasome function, protein synthesis, and stationary phase viabilityQinghua Chen
Sanders Brown Center on Aging, The Department of Anatomy and Neurobiology, University of Kentucky, Lexington, Kentucky 40536, USA
J Biol Chem 280:30009-17. 2005....
Polyglutamine expansion, protein aggregation, proteasome activity, and neural survivalQunxing Ding
Department of Anatomy, University of Kentucky, Lexington, Kentucky 40536, USA
J Biol Chem 277:13935-42. 2002....
The neuregulin GGF2 attenuates free radical release from activated microglial cellsFilomena O Dimayuga
Department of Anatomy and Neurobiology, MN 222 Chandler Medical Center, University of Kentucky, Lexington 40536-0298, USA
J Neuroimmunol 136:67-74. 2003..Overall, these results indicate that the neuregulin rhGGF2 may have anti-inflammatory and antioxidant properties in the brain, and may also provide trophic support for brain-resident microglial cells...
Role of the proteasome in protein oxidation and neural viability following low-level oxidative stressQunxing Ding
Department of Anatomy and Neurobiology, University of Kentucky, Lexington, KY 40536, USA
FEBS Lett 546:228-32. 2003..Taken together, these data indicate that maintaining neural proteasome function may be critical to preventing neurotoxicity, but not the increase in protein oxidation, following low-level oxidative stress...
Characterization of chronic low-level proteasome inhibition on neural homeostasisQunxing Ding
Department of Anatomy and Neurobiology, University of Kentucky, Lexington, Kentucky 40536 0230, USA
J Neurochem 86:489-97. 2003....
Does proteasome inhibition play a role in mediating neuropathology and neuron death in Alzheimer's disease?Qunxing Ding
Department of Anatomy and Neurobiology, University of Kentucky, Lexington KY 40536, USA
J Alzheimers Dis 5:241-5. 2003..Experimental evidence supporting this hypothesis, as well as the scientific implications of this hypothesis are discussed...
Synaptic transport of human immunodeficiency virus-Tat protein causes neurotoxicity and gliosis in rat brainAnnadora J Bruce-Keller
Department of Anatomy and Neurobiology, MN 222 Chandler Medical Center, University of Kentucky, Lexington, Kentucky 40536 0298, USA
J Neurosci 23:8417-22. 2003..Tat may thus be an important participant in brain dysfunction in HIV dementia...
Proteasome inhibition alters neural mitochondrial homeostasis and mitochondria turnoverPatrick G Sullivan
Department of Anatomy and Neurobiology, 205 Sanders-Brown Building, University of Kentucky, Lexington, KY 40536, USA
J Biol Chem 279:20699-707. 2004....
Analysis of gene expression in neural cells subject to chronic proteasome inhibitionQunxing Ding
Department of Anatomy and Neurobiology, University of Kentucky, Lexington, KY 40536, USA
Free Radic Biol Med 36:445-55. 2004....
Loss of an individual proteasome subunit alters motor function but not cognitive function or ambulation in miceSarah Martin
Sanders Brown Center on Aging, University of Kentucky, 205 Sanders Brown Center on Aging, 800 S Limestone, Lexington, KY 40536, USA
Neurosci Lett 357:76-8. 2004..These data demonstrate for the first time that specific proteasome subunits may play a role in regulating both brain function and body weight...
Proteasome synthesis and assembly are required for survival during stationary phaseQinghua Chen
Sanders-Brown Center on Aging, University of Kentucky, Lexington, KY 40536, USA
Free Radic Biol Med 37:859-68. 2004..These data also suggest a role for impaired proteasome-mediated protein degradation in increased protein oxidation and cell death observed during the aging of eukaryotic cells...
Estrogen increases proteasome activity in murine microglial cellsJanelle L Reed
Department of Anatomy and Neurobiology, MN 222 Chandler Medical Center, University of Kentucky, 800 S. Rose Street, Lexington, KY 40536-0298, USA
Neurosci Lett 367:60-5. 2004..Hence, these data demonstrate that through the MAPK pathway, estrogen can upregulate proteasome activity, suggesting a possible mechanism for estrogen's cytoprotective effects...
Proteasome inhibition increases DNA and RNA oxidation in astrocyte and neuron culturesQunxing Ding
Department of Anatomy and Neurobiology, University of Kentucky, Lexington, Kentucky, USA
J Neurochem 91:1211-8. 2004....
RNA interference toward UMP1 induces proteasome inhibition in Saccharomyces cerevisiae: evidence for protein oxidation and autophagic cell deathQinghua Chen
Sanders Brown Center on Aging, University of Kentucky, Lexington, KY 40536, USA
Free Radic Biol Med 38:226-34. 2005..cerevisiae and demonstrate the ability of proteasome inhibition to induce cytotoxic alterations in S. cerevisiae...
The stationary phase model of aging in yeast for the study of oxidative stress and age-related neurodegenerationQuinghua Chen
Sanders-Brown Center on Aging, University of Kentucky, Lexington, 40536-0230, USA
Biogerontology 6:1-13. 2005..cerevisiae as a model system with which to explore the molecular basis for neuronal alterations observed in normal brain aging as well as multiple age-related diseases of the CNS...
Proteasome inhibition induces reversible impairments in protein synthesisQunxing Ding
205 Sanders-Brown Center on Aging, 800 S. Limestone, University of Kentucky, Lexington, Kentucky 40536-0230, USA
FASEB J 20:1055-63. 2006..Together these findings have important implications for understanding proteasome inhibition as a potential contributor to aging and age-related disease...
Analysis of Werner's expression within the brain and primary neuronal cultureJillian Gee
Anatomy and Neurobiology, University of Kentucky, Lexington, KY 40536 0230, USA
Brain Res 940:44-8. 2002..Taken together, these data indicate that WRN is present in the cells of the brain, expressed throughout primary neuronal cells in culture, possibly playing a developmental role in the central nervous system...
Effects of aging and dietary restriction on ubiquitination, sumoylation, and the proteasome in the spleenLe Zhang
Sanders Brown Center on Aging, 205 Sanders Brown, 800 South Limestone, University of Kentucky, Lexington, KY 40536 0230, USA
FEBS Lett 581:5543-7. 2007..Together, these data demonstrate for the first time the multiple effects of aging and DR on ubiquitination, sumoylation, and the proteasome in the spleen...
Cytochrome c release and caspase activation after traumatic brain injuryPatrick G Sullivan
229 Sanders-Brown Center on Aging, University of Kentucky, Lexington, KY 40536-0230, USA
Brain Res 949:88-96. 2002..Our data suggest that several pro-apoptotic events occur following TBI, however the translocation of cytochrome c itself and/or other events upstream of caspase activation/inhibition may be sufficient to induce neuronal cell death...
Enhanced toxicity to the catecholamine tyramine in polyglutamine transfected SH-SY5Y cellsRebecca R Smith
Department of Neurology, University of Kentucky, Lexington, KY 40536-0284, USA
Neurochem Res 30:527-31. 2005..These observations support the notion that the metabolism of dopamine plays a role in neuron death in Huntington's disease...
Astrocytes: regulation of brain homeostasis via apolipoprotein EJillian R Gee
Department of Anatomy and Neurobiology, University of Kentucky, 205 Sanders-Brown, 800 S. Limestone, Lexington, KY 40536-0230, USA
Int J Biochem Cell Biol 37:1145-50. 2005..This review highlights many of the diverse roles played by astrocytes in regulating brain homeostasis and discusses their potential role in a variety of disorders...
Interplay between protein synthesis and degradation in the CNS: physiological and pathological implicationsQunxing Ding
Department of Anatomy and Neurobiology, and Sanders Brown Center on Aging, University of Kentucky, Lexington, KY 40536 0230, USA
Trends Neurosci 30:31-6. 2007..In this review, we discuss evidence for interplay between the UPS and protein-synthesis machinery, and outline the implications of this crosstalk for physiological and pathological processes in the CNS...
4-Hydroxynonenal oxidatively modifies histones: implications for Alzheimer's diseaseJennifer Drake
Department of Chemistry, University of Kentucky, Lexington, KY 40506, USA
Neurosci Lett 356:155-8. 2004..Conceivably, altered DNA-histone interactions, subsequent to oxidative modification of histones by the lipid peroxidation product HNE, may contribute to the vulnerability of DNA to oxidation in AD brain...
Modulation of apolipoprotein E and interleukin-1beta in the aging liverJillian R Gee
Department of Anatomy and Neurobiology, University of Kentucky, Lexington, KY 40536, USA
Exp Gerontol 40:409-15. 2005..Taken together, these studies demonstrate that ApoE expression is altered during normal aging, and indicates that there is no correlation between ApoE and IL-1beta expression in the aging liver...
