The role of adenosine monophosphate-activated protein kinase (AMPK) in the action of modified recombinant extracellular wt (wild-type) ASYN in vitro

Introduction: Alpha-synuclein (ASYN) accumulation is considered to be one of the key factors in Parkinson's disease (PD) pathogenesis. Posttranslational modifications, including oxidation and nitration, can increase aggregation of ASYN. Alterations of adenosine monophosphate-activated protein k...

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Main Authors: Jeremić Marija, Radeta Ratko, Jovanović Maja
Format: Article
Language:English
Published: University of Belgrade, Medical Faculty 2016-01-01
Series:Medicinski Podmladak
Subjects:
Online Access:http://scindeks-clanci.ceon.rs/data/pdf/0369-1527/2016/0369-15271601051J.pdf
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spelling doaj-b07288eef7084cceac4b4c4e645396672020-11-25T01:45:16ZengUniversity of Belgrade, Medical FacultyMedicinski Podmladak0369-15272466-55252016-01-01671515710.5937/medpodm1601051J0369-15271601051JThe role of adenosine monophosphate-activated protein kinase (AMPK) in the action of modified recombinant extracellular wt (wild-type) ASYN in vitroJeremić Marija0Radeta Ratko1Jovanović Maja2University of Belgrade, Faculty of Medicine, Belgrade, SerbiaUniversity of Belgrade, Faculty of Medicine, Belgrade, SerbiaUniversity of Belgrade, Faculty of Medicine, Belgrade, SerbiaIntroduction: Alpha-synuclein (ASYN) accumulation is considered to be one of the key factors in Parkinson's disease (PD) pathogenesis. Posttranslational modifications, including oxidation and nitration, can increase aggregation of ASYN. Alterations of adenosine monophosphate-activated protein kinase (AMPK) signaling have been shown in several neurodegeneration models, including PD. Aim: The aim of this study was to investigate the role of AMPK in the action of modified recombinant wt (wild-type) ASYN on differentiated SH-SY5Y cells. Materials and methods: All experiments were conducted in all-trans retinoic acid-differentiated human neuroblastoma SH-SY5Y cells, treated with 3 different types of modified recombinant wt ASYN (oligomeric, nitrated and dopamine-modified ASYN). Activation of AMPK and Raptor, together with conversion of LC3-I to LC3-II, were monitored using immunoblotting. Cell viability was assessed using crystal violet assay. Results: Treatment with modified recombinant wt ASYN (oligomeric, nitrated and dopamine-modified ASYN) led to substantial decrease in number of viable differentiated SH-SY5Y cells. Western blot analysis showed decreased levels of AMPK and its downstream kinase Raptor, together with an increase in the conversion of LC3-I to LC3-II, upon treatment with recombinant ASYN. Pharmacological activator of AMPK (AICAR) significantly increased the number of viable cell in the presence of all 3 types of modified recombinant wt ASYN. Conclusion: Modified forms of recombinant wt (wildtype) ASYN (oligomeric, nitrated and dopamine-modified ASYN) induced decrease in number of viable differentiated SH-SY5Y cells, accompanied by inactivation of AMPK/Raptor signalling pathway and autophagy induction. Pharmacological activation of AMPK improved cell survival, indicating a protective role of AMPK in neurotoxicity of extracellular ASYN.http://scindeks-clanci.ceon.rs/data/pdf/0369-1527/2016/0369-15271601051J.pdfmodified recombinant wt ASYNAMPKautophagy
collection DOAJ
language English
format Article
sources DOAJ
author Jeremić Marija
Radeta Ratko
Jovanović Maja
spellingShingle Jeremić Marija
Radeta Ratko
Jovanović Maja
The role of adenosine monophosphate-activated protein kinase (AMPK) in the action of modified recombinant extracellular wt (wild-type) ASYN in vitro
Medicinski Podmladak
modified recombinant wt ASYN
AMPK
autophagy
author_facet Jeremić Marija
Radeta Ratko
Jovanović Maja
author_sort Jeremić Marija
title The role of adenosine monophosphate-activated protein kinase (AMPK) in the action of modified recombinant extracellular wt (wild-type) ASYN in vitro
title_short The role of adenosine monophosphate-activated protein kinase (AMPK) in the action of modified recombinant extracellular wt (wild-type) ASYN in vitro
title_full The role of adenosine monophosphate-activated protein kinase (AMPK) in the action of modified recombinant extracellular wt (wild-type) ASYN in vitro
title_fullStr The role of adenosine monophosphate-activated protein kinase (AMPK) in the action of modified recombinant extracellular wt (wild-type) ASYN in vitro
title_full_unstemmed The role of adenosine monophosphate-activated protein kinase (AMPK) in the action of modified recombinant extracellular wt (wild-type) ASYN in vitro
title_sort role of adenosine monophosphate-activated protein kinase (ampk) in the action of modified recombinant extracellular wt (wild-type) asyn in vitro
publisher University of Belgrade, Medical Faculty
series Medicinski Podmladak
issn 0369-1527
2466-5525
publishDate 2016-01-01
description Introduction: Alpha-synuclein (ASYN) accumulation is considered to be one of the key factors in Parkinson's disease (PD) pathogenesis. Posttranslational modifications, including oxidation and nitration, can increase aggregation of ASYN. Alterations of adenosine monophosphate-activated protein kinase (AMPK) signaling have been shown in several neurodegeneration models, including PD. Aim: The aim of this study was to investigate the role of AMPK in the action of modified recombinant wt (wild-type) ASYN on differentiated SH-SY5Y cells. Materials and methods: All experiments were conducted in all-trans retinoic acid-differentiated human neuroblastoma SH-SY5Y cells, treated with 3 different types of modified recombinant wt ASYN (oligomeric, nitrated and dopamine-modified ASYN). Activation of AMPK and Raptor, together with conversion of LC3-I to LC3-II, were monitored using immunoblotting. Cell viability was assessed using crystal violet assay. Results: Treatment with modified recombinant wt ASYN (oligomeric, nitrated and dopamine-modified ASYN) led to substantial decrease in number of viable differentiated SH-SY5Y cells. Western blot analysis showed decreased levels of AMPK and its downstream kinase Raptor, together with an increase in the conversion of LC3-I to LC3-II, upon treatment with recombinant ASYN. Pharmacological activator of AMPK (AICAR) significantly increased the number of viable cell in the presence of all 3 types of modified recombinant wt ASYN. Conclusion: Modified forms of recombinant wt (wildtype) ASYN (oligomeric, nitrated and dopamine-modified ASYN) induced decrease in number of viable differentiated SH-SY5Y cells, accompanied by inactivation of AMPK/Raptor signalling pathway and autophagy induction. Pharmacological activation of AMPK improved cell survival, indicating a protective role of AMPK in neurotoxicity of extracellular ASYN.
topic modified recombinant wt ASYN
AMPK
autophagy
url http://scindeks-clanci.ceon.rs/data/pdf/0369-1527/2016/0369-15271601051J.pdf
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