|کد مقاله||کد نشریه||سال انتشار||مقاله انگلیسی||ترجمه فارسی||نسخه تمام متن|
|5630496||1406467||2018||14 صفحه PDF||ندارد||دانلود کنید|
â¢A transgenic C. elegans model co-expressing human AÎ²1-42 and human tau has been established.â¢Human AÎ²1-42 and human tau co-expression shortens the life span of C. elegans.â¢Human AÎ²1-42 and human tau co-expression interferes with neurotransmitter signaling pathways and disrupts chemotaxis associative learning.â¢Eight differentially expressed genes in the C. elegans model overlapped with those differentially expressed in human AD brains.
Alzheimer's disease (AD) is a progressive neurodegenerative disorder characterized by the presence of extracellular amyloid plaques consisting of Amyloid-Î² peptide (AÎ²) aggregates and neurofibrillary tangles formed by aggregation of hyperphosphorylated microtubule-associated protein tau. We generated a novel invertebrate model of AD by crossing AÎ²1â42 (strain CL2355) with either pro-aggregating tau (strain BR5270) or anti-aggregating tau (strain BR5271) pan-neuronal expressing transgenic Caenorhabditis elegans. The lifespan and progeny viability of the double transgenic strains were significantly decreased compared with wild type N2 (PÂ <Â 0.0001). In addition, co-expression of these transgenes interfered with neurotransmitter signaling pathways, caused deficits in chemotaxis associative learning, increased protein aggregation visualized by Congo red staining, and increased neuronal loss. Global transcriptomic RNA-seq analysis revealed 248 up- and 805 down-regulated genes in N2 wild type versus AÎ²1â42Â +Â pro-aggregating tau animals, compared to 293 up- and 295 down-regulated genes in N2 wild type versus AÎ²1â42Â +Â anti-aggregating tau animals. Gene set enrichment analysis of AÎ²1â42Â +Â pro-aggregating tau animals uncovered up-regulated annotation clusters UDP-glucuronosyltransferase (5 genes, PÂ <Â 4.2EÂ âÂ 4), protein phosphorylation (5 genes, PÂ <Â 2.60EÂ âÂ 02), and aging (5 genes, PÂ <Â 8.1EÂ âÂ 2) while the down-regulated clusters included nematode cuticle collagen (36 genes, PÂ <Â 1.5EÂ âÂ 21).RNA interference of 13 available top up-regulated genes in AÎ²1â42Â +Â pro-aggregating tau animals revealed that F-box family genes and nep-4 could enhance life span deficits and chemotaxis deficits while Y39G8C.2 (TTBK2) could suppress these behaviors.Comparing the list of regulated genes from C. elegans to the top 60 genes related to human AD confirmed an overlap of 8 genes: patched homolog 1, PTCH1 (ptc-3), the Rab GTPase activating protein, TBC1D16 (tbc-16), the WD repeat and FYVE domain-containing protein 3, WDFY3 (wdfy-3), ADP-ribosylation factor guanine nucleotide exchange factor 2, ARFGEF2 (agef-1), Early B-cell Factor, EBF1 (unc-3), d-amino-acid oxidase, DAO (daao-1), glutamate receptor, metabotropic 1, GRM1 (mgl-2), prolyl 4-hydroxylase subunit alpha 2, P4HA2 (dpy-18 and phy-2). Taken together, our C. elegans double transgenic model provides insight on the fundamental neurobiologic processes underlying human AD and recapitulates selected transcriptomic changes observed in human AD brains.
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Journal: Neurobiology of Disease - Volume 109, Part A, January 2018, Pages 88-101