Neuroprotective effects of donepezil against A β42‐induced neuronal toxicity are mediated through not only enhancing PP 2 A activity but also regulating GSK ‐3β and n AChR s activity
The main purpose of this study was to evaluate whether donepezil, acetylcholinesterase inhibitor, shown to play a protective role through inhibiting glycogen synthesis kinase‐3β (GSK‐3β) activity, could also exert neuroprotective effects by stimulating protein phosphatase 2A (PP2A) activity in the a...
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| Published in: | Journal of neurochemistry Vol. 127; no. 4; pp. 562 - 574 |
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| Main Authors: | , , , , , |
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| Language: | English |
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01-11-2013
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| Abstract | The main purpose of this study was to evaluate whether donepezil, acetylcholinesterase inhibitor, shown to play a protective role through inhibiting glycogen synthesis kinase‐3β (GSK‐3β) activity, could also exert neuroprotective effects by stimulating protein phosphatase 2A (PP2A) activity in the amyloid‐beta (Aβ)42‐induced neuronal toxicity model of Alzheimer's disease. In Aβ42‐induced toxic conditions, each PP2A and GSK‐3β activity measured at different times showed time‐dependent reverse pattern toward the direction of accelerating neuronal deaths with the passage of time. In addition, donepezil pre‐treatment showed dose‐dependent stepwise increase of neuronal viability and stimulation of PP2A activity. However, such effects on them were significantly reduced through the depletion of PP2A activity with either okadaic acid or PP2Ac siRNA. In spite of blocked PP2A activity in this Aβ42 insult, however, donepezil pretreatment showed additional significant recovering effect on neuronal viability when compared to the value without donepezil. Moreover, donepezil partially recovered its dephosphorylating effect on hyperphosphorylated tau induced by Aβ42. This observation led us to assume that additional mechanisms of donepezil, including its inhibitory effect on GSK‐3β activity and/or the activation role of nicotinic acetylcholine receptors (nAChRs), might be involved. Taken together, our results suggest that the neuroprotective effects of donepezil against Aβ42‐induced neurotoxicity are mediated through activation of PP2A, but its additional mechanisms including regulation of GSK‐3β and nAChRs activity would partially contribute to its effects.
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We investigated neuroprotective mechanisms of donepezil against Aβ42 toxicity: Donepezil increased neuronal viability with reduced p‐tau by enhancing PP2A activity. Despite of blocked PP2A activity, donepezil showed additional recovering effect on neuronal viability, which findings led us to assume that additional mechanisms of donepezil including its inhibitory effect on GSK‐3β activity and activating role of nicotinic AChRs might be involved. |
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| AbstractList | The main purpose of this study was to evaluate whether donepezil, acetylcholinesterase inhibitor, shown to play a protective role through inhibiting glycogen synthesis kinase‐3β (GSK‐3β) activity, could also exert neuroprotective effects by stimulating protein phosphatase 2A (PP2A) activity in the amyloid‐beta (Aβ)42‐induced neuronal toxicity model of Alzheimer's disease. In Aβ42‐induced toxic conditions, each PP2A and GSK‐3β activity measured at different times showed time‐dependent reverse pattern toward the direction of accelerating neuronal deaths with the passage of time. In addition, donepezil pre‐treatment showed dose‐dependent stepwise increase of neuronal viability and stimulation of PP2A activity. However, such effects on them were significantly reduced through the depletion of PP2A activity with either okadaic acid or PP2Ac siRNA. In spite of blocked PP2A activity in this Aβ42 insult, however, donepezil pretreatment showed additional significant recovering effect on neuronal viability when compared to the value without donepezil. Moreover, donepezil partially recovered its dephosphorylating effect on hyperphosphorylated tau induced by Aβ42. This observation led us to assume that additional mechanisms of donepezil, including its inhibitory effect on GSK‐3β activity and/or the activation role of nicotinic acetylcholine receptors (nAChRs), might be involved. Taken together, our results suggest that the neuroprotective effects of donepezil against Aβ42‐induced neurotoxicity are mediated through activation of PP2A, but its additional mechanisms including regulation of GSK‐3β and nAChRs activity would partially contribute to its effects.
image
We investigated neuroprotective mechanisms of donepezil against Aβ42 toxicity: Donepezil increased neuronal viability with reduced p‐tau by enhancing PP2A activity. Despite of blocked PP2A activity, donepezil showed additional recovering effect on neuronal viability, which findings led us to assume that additional mechanisms of donepezil including its inhibitory effect on GSK‐3β activity and activating role of nicotinic AChRs might be involved. |
| Author | Noh, Min‐Young Kim, Sung‐Min Koh, Seong H. Kim, Seung H. Ku, Sae‐Kwang Maurice, Tangui |
| Author_xml | – sequence: 1 givenname: Min‐Young surname: Noh fullname: Noh, Min‐Young organization: Department of Neurology College of Medicine Hanyang University Seoul Republic of Korea – sequence: 2 givenname: Seong H. surname: Koh fullname: Koh, Seong H. organization: Department of Neurology College of Medicine Hanyang University Seoul Republic of Korea – sequence: 3 givenname: Sung‐Min surname: Kim fullname: Kim, Sung‐Min organization: Department of Neurology College of Medicine Seoul National University Seoul Republic of Korea – sequence: 4 givenname: Tangui surname: Maurice fullname: Maurice, Tangui organization: Team II Endogenous Neuroprotection in Neurodegenerative Diseases INSERM U. 710 University of Montpellier 2 Montpellier Cedex 5 France – sequence: 5 givenname: Sae‐Kwang surname: Ku fullname: Ku, Sae‐Kwang organization: Department of Anatomy and Histology College of Oriental Medicine Daegu Haany University Gyeongsan Republic of Korea – sequence: 6 givenname: Seung H. surname: Kim fullname: Kim, Seung H. organization: Department of Neurology College of Medicine Hanyang University Seoul Republic of Korea |
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