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• W2894211614 abstract "Abstract Histone hypoacetylation is associated with dopaminergic neurodegeneration in Parkinson's disease ( PD ), because of an imbalance in the activities of the enzymes responsible for histone (de)acetylation. Correction of this imbalance, with histone deacetylase ( HDAC ) inhibiting agents, could be neuroprotective. We therefore hypothesize that nicotinamide, being a selective inhibitor of HDAC class III as well as having modulatory effects on mitochondrial energy metabolism, would be neuroprotective in the lactacystin rat model of PD , which recapitulates the formation of neurotoxic accumulation of altered proteins within the substantia nigra to cause progressive dopaminergic cell death. Rats received nicotinamide for 28 days, starting 7 days after unilateral injection of the irreversible proteasome inhibitor, lactacystin, into the substantia nigra. Longitudinal motor behavioural testing and structural magnetic resonance imaging were used to track changes in this model of PD , and assessment of nigrostriatal integrity, histone acetylation and brain gene expression changes post‐mortem used to quantify nicotinamide‐induced neuroprotection. Counterintuitively, nicotinamide dose‐dependently exacerbated neurodegeneration of dopaminergic neurons, behavioural deficits and structural brain changes in the lactacystin‐lesioned rat. Nicotinamide treatment induced histone hyperacetylation and over‐expression of numerous neurotrophic and anti‐apoptotic factors in the brain, yet failed to result in neuroprotection, rather exacerbated dopaminergic pathology. These findings highlight the importance of inhibitor specificity within HDAC isoforms for therapeutic efficacy in PD , demonstrating the contrasting effects of HDAC class III inhibition upon cell survival in this animal model of the disease. Open science badges This article has received a badge for * Open Materials * because it provided all relevant information to reproduce the study in the manuscript. The complete Open Science Disclosure form for this article can be found at the end of the article. More information about the Open Practices badges can be found at https://cos.io/our-services/open-science-badges/ . image" @default.
• W2894211614 created "2018-10-05" @default.
• W2894211614 creator A5034535805 @default.
• W2894211614 creator A5034967345 @default.
• W2894211614 creator A5050474161 @default.
• W2894211614 date "2018-11-26" @default.
• W2894211614 modified "2023-10-18" @default.
• W2894211614 title "The histone deacetylase inhibitor nicotinamide exacerbates neurodegeneration in the lactacystin rat model of Parkinson's disease" @default.
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• W2894211614 doi "https://doi.org/10.1111/jnc.14599" @default.
• W2894211614 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6487684" @default.
• W2894211614 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30269333" @default.
• W2894211614 hasPublicationYear "2018" @default.
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