Kiebish 2013 J Lipid Res: Difference between revisions
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|year=2013 | |year=2013 | ||
|journal=J Lipid Res | |journal=J Lipid Res | ||
|abstract=Barth syndrome is a complex metabolic disorder caused by mutations in the mitochondrial transacylase Tafazzin. Recently, an inducible Tafazzin shRNA knockdown mouse model was generated to deconvolute the complex bioenergetic phenotype of this disease. To investigate the underlying cause of hemodynamic dysfunction in Barth syndrome, we interrogated the cardiac structural and signaling lipidome of this mouse model as well as its myocardial bioenergetic phenotype. A decrease in the distribution of cardiolipin molecular species and robust increases in monolysocardiolipin and dilysocardiolipin were demonstrated. Additionally, the contents of choline and ethanolamine glycerophospholipid molecular species containing precursors for lipid signaling at the sn-2 position were altered. Lipidomic analyses revealed specific dysregulation of HETEs, prostanoids, as well as oxidized linoleic and docosahexaenoic metabolites. Bioenergetic interrogation uncovered differential substrate utilization as well as deceases in Complex III and | |abstract=Barth syndrome is a complex metabolic disorder caused by mutations in the mitochondrial transacylase Tafazzin. Recently, an inducible Tafazzin shRNA knockdown mouse model was generated to deconvolute the complex bioenergetic phenotype of this disease. To investigate the underlying cause of hemodynamic dysfunction in Barth syndrome, we interrogated the cardiac structural and signaling lipidome of this mouse model as well as its myocardial bioenergetic phenotype. A decrease in the distribution of cardiolipin molecular species and robust increases in monolysocardiolipin and dilysocardiolipin were demonstrated. Additionally, the contents of choline and ethanolamine glycerophospholipid molecular species containing precursors for lipid signaling at the sn-2 position were altered. Lipidomic analyses revealed specific dysregulation of HETEs, prostanoids, as well as oxidized linoleic and docosahexaenoic metabolites. Bioenergetic interrogation uncovered differential substrate utilization as well as deceases in Complex III and CV activities. Transgenic expression of cardiolipin synthase or iPLA2ฮณ ablation in Tafazzin deficient mice did not rescue the observed phenotype. These results underscore the complex nature of alterations in cardiolipin metabolism mediated by Tafazzin loss of function. Collectively, we identified specific lipidomic, bioenergetic and signaling alterations in a murine model that parallel those of Barth syndrome thereby providing novel insights into the pathophysiology of this debilitating disease. | ||
|keywords=Lipidome; Cardiolipin; Tafazzin; Phospholipase; Cardiolipin synthase; | |keywords=Lipidome; Cardiolipin; Tafazzin; Phospholipase; Cardiolipin synthase; Barth dyndrome | ||
|mipnetlab=US MO St Louis Gross RW, | |mipnetlab=US MO St Louis Gross RW, | ||
}} | }} | ||
{{Labeling | {{Labeling | ||
| | |area=Respiration, nDNA;cell genetics, Genetic knockout;overexpression, mt-Medicine | ||
|organism=Mouse | |organism=Mouse | ||
|tissues=Heart | |tissues=Heart | ||
|preparations=Isolated Mitochondria | |preparations=Isolated Mitochondria | ||
|enzymes=Complex I, Complex II; Succinate Dehydrogenase, Complex III, Complex IV; Cytochrome c Oxidase, Complex V; ATP Synthase | |||
|injuries=Mitochondrial Disease; Degenerative Disease and Defect | |||
|diseases=Other | |||
|couplingstates=LEAK, OXPHOS | |couplingstates=LEAK, OXPHOS | ||
|substratestates=CI, CII, ETF, CI+II | |substratestates=CI, CII, ETF, CI+II | ||
| | |instruments=Oxygraph-2k | ||
}} | }} |
Revision as of 10:12, 12 August 2013
Kiebish MA, Yang K, Liu X, Mancuso DJ, Guan S, Zhao Z, Sims HF, Cerqua R, Cade WT, Han X, Gross RW (2013) Dysfunctional cardiac mitochondrial bioenergetic, lipidomic, and signaling in a murine model of Barth syndrome. J Lipid Res 54: 1312-1325. |
Kiebish MA, Yang K, Liu X, Mancuso DJ, Guan S, Zhao Z, Sims HF, Cerqua R, Cade WT, Han X, Gross RW (2013) J Lipid Res
Abstract: Barth syndrome is a complex metabolic disorder caused by mutations in the mitochondrial transacylase Tafazzin. Recently, an inducible Tafazzin shRNA knockdown mouse model was generated to deconvolute the complex bioenergetic phenotype of this disease. To investigate the underlying cause of hemodynamic dysfunction in Barth syndrome, we interrogated the cardiac structural and signaling lipidome of this mouse model as well as its myocardial bioenergetic phenotype. A decrease in the distribution of cardiolipin molecular species and robust increases in monolysocardiolipin and dilysocardiolipin were demonstrated. Additionally, the contents of choline and ethanolamine glycerophospholipid molecular species containing precursors for lipid signaling at the sn-2 position were altered. Lipidomic analyses revealed specific dysregulation of HETEs, prostanoids, as well as oxidized linoleic and docosahexaenoic metabolites. Bioenergetic interrogation uncovered differential substrate utilization as well as deceases in Complex III and CV activities. Transgenic expression of cardiolipin synthase or iPLA2ฮณ ablation in Tafazzin deficient mice did not rescue the observed phenotype. These results underscore the complex nature of alterations in cardiolipin metabolism mediated by Tafazzin loss of function. Collectively, we identified specific lipidomic, bioenergetic and signaling alterations in a murine model that parallel those of Barth syndrome thereby providing novel insights into the pathophysiology of this debilitating disease. โข Keywords: Lipidome; Cardiolipin; Tafazzin; Phospholipase; Cardiolipin synthase; Barth dyndrome
โข O2k-Network Lab: US MO St Louis Gross RW
Labels: MiParea: Respiration, nDNA;cell genetics, Genetic knockout;overexpression, mt-Medicine
Pathology: Other
Stress:Mitochondrial Disease; Degenerative Disease and Defect"Mitochondrial Disease; Degenerative Disease and Defect" is not in the list (Cell death, Cryopreservation, Ischemia-reperfusion, Permeability transition, Oxidative stress;RONS, Temperature, Hypoxia, Mitochondrial disease) of allowed values for the "Stress" property.
Organism: Mouse
Tissue;cell: Heart
Preparation: Isolated Mitochondria"Isolated Mitochondria" is not in the list (Intact organism, Intact organ, Permeabilized cells, Permeabilized tissue, Homogenate, Isolated mitochondria, SMP, Chloroplasts, Enzyme, Oxidase;biochemical oxidation, ...) of allowed values for the "Preparation" property.
Enzyme: Complex I, Complex II; Succinate Dehydrogenase"Complex II; Succinate Dehydrogenase" is not in the list (Adenine nucleotide translocase, Complex I, Complex II;succinate dehydrogenase, Complex III, Complex IV;cytochrome c oxidase, Complex V;ATP synthase, Inner mt-membrane transporter, Marker enzyme, Supercomplex, TCA cycle and matrix dehydrogenases, ...) of allowed values for the "Enzyme" property., Complex III, Complex IV; Cytochrome c Oxidase"Complex IV; Cytochrome c Oxidase" is not in the list (Adenine nucleotide translocase, Complex I, Complex II;succinate dehydrogenase, Complex III, Complex IV;cytochrome c oxidase, Complex V;ATP synthase, Inner mt-membrane transporter, Marker enzyme, Supercomplex, TCA cycle and matrix dehydrogenases, ...) of allowed values for the "Enzyme" property., Complex V; ATP Synthase"Complex V; ATP Synthase" is not in the list (Adenine nucleotide translocase, Complex I, Complex II;succinate dehydrogenase, Complex III, Complex IV;cytochrome c oxidase, Complex V;ATP synthase, Inner mt-membrane transporter, Marker enzyme, Supercomplex, TCA cycle and matrix dehydrogenases, ...) of allowed values for the "Enzyme" property.
Coupling state: LEAK, OXPHOS
HRR: Oxygraph-2k