Article (Scientific journals)
Mitochondria-Endoplasmic Reticulum Contact Sites Dynamics and Calcium Homeostasis Are Differentially Disrupted in PINK1-PD or PRKN-PD Neurons
Grossmann, Dajana; Malburg, Nina; Glaß, Hannes et al.
2023In Movement disorders : official journal of the Movement Disorder Society
Peer reviewed
 

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Abstract :
[en] Background: It is generally believed that the pathogenesis of PINK1/parkin-related Parkinson's disease (PD) is due to a disturbance in mitochondrial quality control. However, recent studies have found that PINK1 and Parkin play a significant role in mitochondrial calcium homeostasis and are involved in the regulation of mitochondria-endoplasmic reticulum contact sites (MERCSs). Objective: The aim of our study was to perform an in-depth analysis of the role of MERCSs and impaired calcium homeostasis in PINK1/Parkin-linked PD.<h4>Methods</h4>In our study, we used induced pluripotent stem cell-derived dopaminergic neurons from patients with PD with loss-of-function mutations in PINK1 or PRKN. We employed a split-GFP-based contact site sensor in combination with the calcium-sensitive dye Rhod-2 AM and applied Airyscan live-cell super-resolution microscopy to determine how MERCSs are involved in the regulation of mitochondrial calcium homeostasis. Results: Our results showed that thapsigargin-induced calcium stress leads to an increase of the abundance of narrow MERCSs in wild-type neurons. Intriguingly, calcium levels at the MERCSs remained stable, whereas the increased net calcium influx resulted in elevated mitochondrial calcium levels. However, PINK1-PD or PRKN-PD neurons showed an increased abundance of MERCSs at baseline, accompanied by an inability to further increase MERCSs upon thapsigargin-induced calcium stress. Consequently, calcium distribution at MERCSs and within mitochondria was disrupted. Conclusions: Our results demonstrated how the endoplasmic reticulum and mitochondria work together to cope with calcium stress in wild-type neurons. In addition, our results suggests that PRKN deficiency affects the dynamics and composition of MERCSs differently from PINK1 deficiency, resulting in differentially affected calcium homeostasis. © 2023 The Authors. Movement Disorders published by Wiley Periodicals LLC on behalf of International Parkinson and Movement Disorder Society.
Disciplines :
Biochemistry, biophysics & molecular biology
Author, co-author :
Grossmann, Dajana
Malburg, Nina
Glaß, Hannes
Weeren, Veronika
Sondermann, Verena
Pfeiffer, Julia F.
Petters, Janine
Lukas, Jan
Seibler, Philip
Klein, Christine
GRÜNEWALD, Anne  ;  University of Luxembourg > Luxembourg Centre for Systems Biomedicine (LCSB) > Molecular and Functional Neurobiology
Hermann, Andreas
External co-authors :
yes
Language :
English
Title :
Mitochondria-Endoplasmic Reticulum Contact Sites Dynamics and Calcium Homeostasis Are Differentially Disrupted in PINK1-PD or PRKN-PD Neurons
Publication date :
2023
Journal title :
Movement disorders : official journal of the Movement Disorder Society
ISSN :
0885-3185
Peer reviewed :
Peer reviewed
FnR Project :
FNR9631103 - Modelling Idiopathic Parkinson'S Disease-associated Somatic Variation In Dopaminergic Neurons, 2015 (01/01/2016-31/12/2022) - Anne Grünewald
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since 18 July 2023

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