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Panagaki T, Pecze L, Randi EB, Nieminen AI, Szabo C. Role of the cystathionine β-synthase / H 2S pathway in the development of cellular metabolic dysfunction and pseudohypoxia in down syndrome. Redox Biol 2022; 55:102416. [PMID: 35921774 PMCID: PMC9356176 DOI: 10.1016/j.redox.2022.102416] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2022] [Revised: 07/10/2022] [Accepted: 07/17/2022] [Indexed: 11/30/2022] Open
Abstract
BACKGROUND Overexpression of the transsulfuration enzyme cystathionine-β-synthase (CBS), and overproduction of its product, hydrogen sulfide (H2S) are recognized as potential pathogenetic factors in Down syndrome (DS). The purpose of the study was to determine how the mitochondrial function and core metabolic pathways are affected by DS and how pharmacological inhibition of CBS affects these parameters. METHODS 8 human control and 8 human DS fibroblast cell lines have been subjected to bioenergetic and fluxomic and proteomic analysis with and without treatment with a pharmacological inhibitor of CBS. RESULTS DS cells exhibited a significantly higher CBS expression than control cells, and produced more H2S. They also exhibited suppressed mitochondrial electron transport and oxygen consumption and suppressed Complex IV activity, impaired cell proliferation and increased ROS generation. Inhibition of H2S biosynthesis with aminooxyacetic acid reduced cellular H2S, improved cellular bioenergetics, attenuated ROS and improved proliferation. 13C glucose fluxomic analysis revealed that DS cells exhibit a suppression of the Krebs cycle activity with a compensatory increase in glycolysis. CBS inhibition restored the flux from glycolysis to the Krebs cycle and reactivated oxidative phosphorylation. Proteomic analysis revealed no CBS-dependent alterations in the expression level of the enzymes involved in glycolysis, oxidative phosphorylation and the pentose phosphate pathway. DS was associated with the dysregulation of several components of the autophagy network; CBS inhibition normalized several of these parameters. CONCLUSIONS Increased H2S generation in DS promotes pseudohypoxia and contributes to cellular metabolic dysfunction by causing a shift from oxidative phosphorylation to glycolysis.
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Affiliation(s)
- Theodora Panagaki
- Faculty of Science and Medicine, University of Fribourg, Fribourg, Switzerland
| | - Laszlo Pecze
- Faculty of Science and Medicine, University of Fribourg, Fribourg, Switzerland
| | - Elisa B Randi
- Faculty of Science and Medicine, University of Fribourg, Fribourg, Switzerland
| | - Anni I Nieminen
- Metabolomics Unit, Institute for Molecular Medicine Finland, University of Helsinki, Helsinki, Finland
| | - Csaba Szabo
- Faculty of Science and Medicine, University of Fribourg, Fribourg, Switzerland.
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Romero-Morales AI, Robertson GL, Rastogi A, Rasmussen ML, Temuri H, McElroy GS, Chakrabarty RP, Hsu L, Almonacid PM, Millis BA, Chandel NS, Cartailler JP, Gama V. Human iPSC-derived cerebral organoids model features of Leigh syndrome and reveal abnormal corticogenesis. Development 2022; 149:275911. [PMID: 35792828 PMCID: PMC9357378 DOI: 10.1242/dev.199914] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2021] [Accepted: 05/18/2022] [Indexed: 01/12/2023]
Abstract
Leigh syndrome (LS) is a rare, inherited neurometabolic disorder that presents with bilateral brain lesions caused by defects in the mitochondrial respiratory chain and associated nuclear-encoded proteins. We generated human induced pluripotent stem cells (iPSCs) from three LS patient-derived fibroblast lines. Using whole-exome and mitochondrial sequencing, we identified unreported mutations in pyruvate dehydrogenase (GM0372, PDH; GM13411, MT-ATP6/PDH) and dihydrolipoyl dehydrogenase (GM01503, DLD). These LS patient-derived iPSC lines were viable and capable of differentiating into progenitor populations, but we identified several abnormalities in three-dimensional differentiation models of brain development. LS patient-derived cerebral organoids showed defects in neural epithelial bud generation, size and cortical architecture at 100 days. The double mutant MT-ATP6/PDH line produced organoid neural precursor cells with abnormal mitochondrial morphology, characterized by fragmentation and disorganization, and showed an increased generation of astrocytes. These studies aim to provide a comprehensive phenotypic characterization of available patient-derived cell lines that can be used to study Leigh syndrome.
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Affiliation(s)
| | - Gabriella L. Robertson
- Department of Cell and Developmental Biology, Vanderbilt University, Nashville, TN 37232, USA
| | - Anuj Rastogi
- Department of Cell and Developmental Biology, Vanderbilt University, Nashville, TN 37232, USA
| | - Megan L. Rasmussen
- Department of Cell and Developmental Biology, Vanderbilt University, Nashville, TN 37232, USA
| | - Hoor Temuri
- Department of Cell and Developmental Biology, Vanderbilt University, Nashville, TN 37232, USA
| | - Gregory Scott McElroy
- Feinberg School of Medicine, Department of Medicine, Division of Pulmonary and Critical Care Medicine, Northwestern University, Chicago, IL 60611, USA
| | - Ram Prosad Chakrabarty
- Feinberg School of Medicine, Department of Medicine, Division of Pulmonary and Critical Care Medicine, Northwestern University, Chicago, IL 60611, USA
| | - Lawrence Hsu
- Creative Data Solutions, Vanderbilt Center for Stem Cell Biology,Vanderbilt University,Nashville, TN 37232, USA
| | | | - Bryan A. Millis
- Department of Cell and Developmental Biology, Vanderbilt University, Nashville, TN 37232, USA,Vanderbilt Biophotonics Center,Vanderbilt University, Nashville, TN 37232, USA
| | - Navdeep S. Chandel
- Feinberg School of Medicine, Department of Medicine, Division of Pulmonary and Critical Care Medicine, Northwestern University, Chicago, IL 60611, USA,Feinberg School of Medicine, Department of Biochemistry and Molecular Genetics, Northwestern University, Chicago, IL 60611, USA
| | - Jean-Philippe Cartailler
- Creative Data Solutions, Vanderbilt Center for Stem Cell Biology,Vanderbilt University,Nashville, TN 37232, USA
| | - Vivian Gama
- Department of Cell and Developmental Biology, Vanderbilt University, Nashville, TN 37232, USA,Creative Data Solutions, Vanderbilt Center for Stem Cell Biology,Vanderbilt University,Nashville, TN 37232, USA,Vanderbilt Brain Institute,Vanderbilt University,Nashville, TN 37232, USA,Author for correspondence ()
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