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Overexpression of N141I PS2 increases γ-secretase activity through up-regulation of Presenilin and Pen-2 in brain mitochondria of NSE/hPS2m transgenic mice

Laboratory Animal Research volume 32, pages 249–256 (2016)Cite this article

Abstract

Alzheimer’s disease (AD) is known to induce alterations of mitochondrial function such as elevation of oxidative stress and activation of apopotosis. The aim of this study was to investigate the effects of human Presenilin 2 mutant (hPS2m) overexpression on the γ-secretase complex in the mitochondrial fraction. To achieve this, alterations of γ-secretase complex expression and activity were detected in the mitochondrial fraction derived from brains of NSE/hPS2m Tg mice and Non-Tg mice. Herein, the following were observed: i) overexpression of the hPS2m gene significantly up-regulated the deposition of Aβ-42 peptides in the hippocampus and cortex of brain, ii) overexpression of hPS2m protein induced alterations of γ-secretase components such as main component protein and activator protein but not stabilization-related proteins, iii) changes in γ-secretase components induced by overexpression of hPS2m protein up-regulated γ-secretase activity in the mitochondrial fraction, and iv) elevation of γ-secretase activity induced production of Aβ-42 peptides in the mitochondrial fraction. Based on these observations, these results indicate that alteration of γ-secretase activity in cells upon overexpression of hPS2m is tightly linked to mitochondrial dysfunction under the specific physiological and pathological conditions of AD.

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  1. These authors contributed equaly this work.

Authors and Affiliations

  1. Department of Biomaterials Science, College of Natural Resources and Life Science/Life and Industry Convergence Research Institute, Pusan National University, Miryang, Korea

    Woo Bin Yun, Jin Ju Park, Ji Eun Kim, Ji Eun Sung, Hyun Ah Lee, Jae Ho Lee & Dae Youn Hwang

  2. Biologics Division, Ministry of Food and Drug Administration (MFDS), Cheongju, Korea

    Chang Jun Bae

  3. Department of Biomaterials Science, College of Natural Resources and Life Science, Pusan National University, 50 Cheonghak-ri, Samnangjin-eup, Miryang, Gyeongnam, 627-706, Korea

    Dae Youn Hwang

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  1. Woo Bin Yun
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Correspondence to Dae Youn Hwang.

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Yun, W.B., Park, J.J., Kim, J.E. et al. Overexpression of N141I PS2 increases γ-secretase activity through up-regulation of Presenilin and Pen-2 in brain mitochondria of NSE/hPS2m transgenic mice. Lab Anim Res 32, 249–256 (2016). https://doi.org/10.5625/lar.2016.32.4.249

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Laboratory Animal Research

ISSN: 2233-7660