Transient transfection of WT-αS and A53T-αS brought about a mild apoptosis due to degradation of released cytochrome c through PARC
Autor: | Soheila Mohammadi, Maryam Nikkhah, Saman Hosseinkhani, Mohammad Hossein Salehi |
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Rok vydání: | 2020 |
Předmět: |
Programmed cell death
Mutation Missense Apoptosis 02 engineering and technology Molecular Dynamics Simulation Biochemistry Pathogenesis 03 medical and health sciences Structural Biology Transferases Humans Molecular Biology 030304 developmental biology Synucleinopathies Caspase-9 0303 health sciences Binding Sites biology Chemistry Cytochrome c Intrinsic apoptosis Cytochromes c General Medicine 021001 nanoscience & nanotechnology Caspase 9 Cell biology HEK293 Cells Proteolysis biology.protein alpha-Synuclein Degradation (geology) 0210 nano-technology Protein Binding |
Zdroj: | International journal of biological macromolecules. 166 |
ISSN: | 1879-0003 |
Popis: | α-Synuclein (αS) aggregates plays a pivotal role in the pathogenesis of synucleinopathies including Parkinson's Disease. The toxicity of αS aggregates has been broadly studied and variant defects have been reported through which these aggregates lead in cell death. Although cell death through apoptosis pathway has been proposed in many studies, the molecular details underlying in this pathway have not been uncovered. To shed a light on the relationships between αS aggregates and apoptotic cell death, changes in levels and behavior of molecular indicators of the intrinsic apoptotic pathway was investigated in HEK-293T cells overexpressing wild-type α-synuclein and A53T-α-synuclein. Overexpression of both WT-αS and A53T-αS resulted in the increase of caspase-9 activity, and rise in Cytochrome c (Cyt c) and PARC content, concurrently. We assume that rising in PARC level may result in Cyt c degradation, and consequently suppressing/attenuating intrinsic apoptosis pathway. Besides, increasing of Casp-9 activity can be related to αS aggregates and subsequent degradation of Cyt c. To understand the mechanisms behind this using theoretical model, molecular dynamic simulation was also applied to investigate the possible interaction of Casp-9 with α-synuclein aggregates. The results showed that the interaction between Casp-9 with αS aggregates could activate Casp-9 by changing the conformation of some crucial residues. |
Databáze: | OpenAIRE |
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