Cellular Model of Alzheimer's Disease: Aβ1-42 Peptide Induces Amyloid Deposition and a Decrease in Topo Isomerase IIβ and Nurr1 Expression

Title:Cellular Model of Alzheimer's Disease: Aβ1-42 Peptide Induces Amyloid Deposition and a Decrease in Topo Isomerase IIβ and Nurr1 Expression

Volume: 14 Issue: 6

Author(s): Sule Terzioglu-Usak, Yesim Negis, Derya S. Karabulut, Merve Zaim and Sevim Isik*

Affiliation:

• Biotechnology Research Lab, EMC Technology Inc, ARGEM Building, Technocity, Avcılar, Istanbul 34320,Turkey

Keywords: DNA topoisomerase IIβ, Alzheimer's disease, amyloid beta 1-42 peptide, axonogenesis, rat primary cerebellar granule neurons, human mesenchymal stem cell line.

Abstract: Background: DNA topoisomerase IIβ (topo IIβ) plays a crucial role in neural differentiation and axonogenesis. Inhibition of topo IIβ activity in vitro and in vivo results in shorter axons and increased DNA damage. These molecular events also involve in Alzheimer's disease (AD); however, the role of topo IIβ in the pathogenesis of AD remains to be elucidated.

Objectives: We aimed to investigate the role of topo IIβ association with Nuclear receptor related 1 protein (Nurr1) in the onset of AD.

Methods: In vitro AD model was established by the incubation of fibrillar amyloid-β 1-42 (Aβ1-42) for 48 hours with cultured cerebellar granule neurons (CGNs) isolated from post-natal eight-day rats. The regulatory role of topo IIβ on the transcription of Nurr1 was analyzed in topo IIβ silenced CGNs, and also topo IIβ silenced and overexpressed in a neurally-differentiated human mesenchymal (hMSC) cell line.

Results: Aβ1-42 fibrils led to the upregulation of Presenilin1 and Cofilin1 genes as measured at mRNA levels and hyperphosphorylation of tau protein, all are distinctive characteristics of AD pathology. A significant decrease in topo IIβ expression at mRNA and protein levels and Nurr1 at mRNA level was also observed. In both cell types, Nurr1 expression was dramatically down-regulated due to topo IIβ deficiency, and was increased in topo IIβ overexpressing hMSCs.

Conclusion: Our findings suggest that topo IIβ could be a down-stream target of signaling pathways contributing to AD-like pathology. However, further studies must be carried out in vivo to elucidate the precise association topo IIβ with AD.

Cite this article as:

Terzioglu-Usak Sule, Negis Yesim, Karabulut S. Derya, Zaim Merve and Isik Sevim*, Cellular Model of Alzheimer's Disease: Aβ1-42 Peptide Induces Amyloid Deposition and a Decrease in Topo Isomerase IIβ and Nurr1 Expression, Current Alzheimer Research 2017; 14 (6) . https://dx.doi.org/10.2174/1567205014666170117103217

DOI https://dx.doi.org/10.2174/1567205014666170117103217	Print ISSN 1567-2050
Publisher Name Bentham Science Publisher	Online ISSN 1875-5828