Altered Machinery of Protein Synthesis in Alzheimer's: From the Nucleolus to the Ribosome
TLDR
Findings show alterations in the protein synthesis machinery in AD involving the nucleolus, nucleus and ribosomes in the hippocampus in AD some of them starting at first stages (I–II) preceding neuron loss.Abstract:
Ribosomes and protein synthesis have been reported to be altered in the cerebral cortex at advanced stages of Alzheimer's disease (AD). Modifications in the hippocampus with disease progression have not been assessed. Sixty-seven cases including middle-aged (MA) and AD stages I-VI were analyzed. Nucleolar chaperones nucleolin, nucleophosmin and nucleoplasmin 3, and upstream binding transcription factor RNA polymerase I gene (UBTF) mRNAs are abnormally regulated and their protein levels reduced in AD. Histone modifications dimethylated histone H3K9 (H3K9me2) and acetylated histone H3K12 (H3K12ac) are decreased in CA1. Nuclear tau declines in CA1 and dentate gyrus (DG), and practically disappears in neurons with neurofibrillary tangles. Subunit 28 ribosomal RNA (28S rRNA) expression is altered in CA1 and DG in AD. Several genes encoding ribosomal proteins are abnormally regulated and protein levels of translation initiation factors eIF2α, eIF3η and eIF5, and elongation factor eEF2, are altered in the CA1 region in AD. These findings show alterations in the protein synthesis machinery in AD involving the nucleolus, nucleus and ribosomes in the hippocampus in AD some of them starting at first stages (I-II) preceding neuron loss. These changes may lie behind reduced numbers of dendritic branches and reduced synapses of CA1 and DG neurons which cause hippocampal atrophy.read more
Citations
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Nuclear Tau and Its Potential Role in Alzheimer's Disease.
Mahmoud Bukar Maina,Mahmoud Bukar Maina,Youssra K. Al-Hilaly,Youssra K. Al-Hilaly,Louise C. Serpell +4 more
TL;DR: The cellular distribution of tau, its nuclear localisation and function and its possible involvement in neurodegeneration are explored.
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Ribosomopathies: Old Concepts, New Controversies.
TL;DR: The role of ribosome biogenesis in diverse tissue types throughout embryonic development is broadened and the question of whether previously described human conditions such as aging can be at least partially attributed to defects in making ribosomes is posed.
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Heiko Braak,Eva Braak +1 more
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