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Live cell imaging of ATP levels reveals metabolic compartmentalization within motoneurons and early metabolic changes in FUS ALS motoneurons
Department of Molecular Physiology and Biological Physics, School of Medicine, University of Virginia, VA, Charlottesville, United States; Center for Membrane and Cell Physiology, School of Medicine, University of Virginia, VA, Charlottesville, United States; Department of Neurology, Technische Universität Dresden, Dresden, Germany.
Translational Neurodegeneration Section, “Albrecht Kossel”, Department of Neurology, University Medical Center Rostock, University of Rostock, Rostock, Germany.
Translational Neurodegeneration Section, “Albrecht Kossel”, Department of Neurology, University Medical Center Rostock, University of Rostock, Rostock, Germany.
Department of Neurology, Technische Universität Dresden, Dresden, Germany.
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2023 (Engelska)Ingår i: Cells, E-ISSN 2073-4409, Vol. 12, nr 10, artikel-id 1352Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Motoneurons are one of the most energy-demanding cell types and a primary target in Amyotrophic lateral sclerosis (ALS), a debilitating and lethal neurodegenerative disorder without currently available effective treatments. Disruption of mitochondrial ultrastructure, transport, and metabolism is a commonly reported phenotype in ALS models and can critically affect survival and the proper function of motor neurons. However, how changes in metabolic rates contribute to ALS progression is not fully understood yet. Here, we utilize hiPCS-derived motoneuron cultures and live imaging quantitative techniques to evaluate metabolic rates in fused in sarcoma (FUS)-ALS model cells. We show that differentiation and maturation of motoneurons are accompanied by an overall upregulation of mitochondrial components and a significant increase in metabolic rates that correspond to their high energy-demanding state. Detailed compartment-specific live measurements using a fluorescent ATP sensor and FLIM imaging show significantly lower levels of ATP in the somas of cells carrying FUS-ALS mutations. These changes lead to the increased vulnerability of diseased motoneurons to further metabolic challenges with mitochondrial inhibitors and could be due to the disruption of mitochondrial inner membrane integrity and an increase in its proton leakage. Furthermore, our measurements demonstrate heterogeneity between axonal and somatic compartments, with lower relative levels of ATP in axons. Our observations strongly support the hypothesis that mutated FUS impacts the metabolic states of motoneurons and makes them more susceptible to further neurodegenerative mechanisms.

Ort, förlag, år, upplaga, sidor
MDPI, 2023. Vol. 12, nr 10, artikel-id 1352
Nyckelord [en]
amyotrophic lateral sclerosis, metabolism, mitochondria
Nationell ämneskategori
Neurologi
Identifikatorer
URN: urn:nbn:se:umu:diva-209563DOI: 10.3390/cells12101352ISI: 000996861700001Scopus ID: 2-s2.0-85160644094OAI: oai:DiVA.org:umu-209563DiVA, id: diva2:1765933
Forskningsfinansiär
Hjärnfonden, 2012-0262Hjärnfonden, 2018-0310Hjärnfonden, 2020-0353Knut och Alice Wallenbergs Stiftelse, 2012.0091Knut och Alice Wallenbergs Stiftelse, 2014.0305Knut och Alice Wallenbergs Stiftelse, 2020.0232Konung Gustaf V:s och Drottning Victorias FrimurarestiftelseTillgänglig från: 2023-06-12 Skapad: 2023-06-12 Senast uppdaterad: 2023-06-12Bibliografiskt granskad

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Andersen, Peter M.

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