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  • Calcium dysregulation combined with mitochondrial failure and electrophysiological maturity converge in Parkinson's iPSC-dopamine neurons.

Calcium dysregulation combined with mitochondrial failure and electrophysiological maturity converge in Parkinson's iPSC-dopamine neurons.

iScience (2023-07-10)
Dayne A Beccano-Kelly, Marta Cherubini, Yassine Mousba, Kaitlyn M L Cramb, Stefania Giussani, Maria Claudia Caiazza, Pavandeep Rai, Siv Vingill, Nora Bengoa-Vergniory, Bryan Ng, Gabriele Corda, Abhirup Banerjee, Jane Vowles, Sally Cowley, Richard Wade-Martins
ABSTRACT

Parkinson's disease (PD) is characterized by a progressive deterioration of motor and cognitive functions. Although death of dopamine neurons is the hallmark pathology of PD, this is a late-stage disease process preceded by neuronal dysfunction. Here we describe early physiological perturbations in patient-derived induced pluripotent stem cell (iPSC)-dopamine neurons carrying the GBA-N370S mutation, a strong genetic risk factor for PD. GBA-N370S iPSC-dopamine neurons show an early and persistent calcium dysregulation notably at the mitochondria, followed by reduced mitochondrial membrane potential and oxygen consumption rate, indicating mitochondrial failure. With increased neuronal maturity, we observed decreased synaptic function in PD iPSC-dopamine neurons, consistent with the requirement for ATP and calcium to support the increase in electrophysiological activity over time. Our work demonstrates that calcium dyshomeostasis and mitochondrial failure impair the higher electrophysiological activity of mature neurons and may underlie the vulnerability of dopamine neurons in PD.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Carbonyl cyanide 4-(trifluoromethoxy)phenylhydrazone, ≥98% (TLC), powder
Sigma-Aldrich
N6,2′-O-Dibutyryladenosine 3′,5′-cyclic monophosphate sodium salt, ≥96% (HPLC), powder
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Cyclopiazonic acid from Penicillium cyclopium, ≥98% (HPLC), powder
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Carbonyl cyanide 3-chlorophenylhydrazone, ≥97% (TLC), powder
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LDN193189 hydrochloride, ≥98% (HPLC)
Sigma-Aldrich
Anti-iPLA2 Antibody, from rabbit, purified by affinity chromatography