2025
1823-P: The Beta-Cell Secretagogue Glyceraldehyde Induces Mitochondrial Leak Respiration, Not OXPHOS
CARDONE R, KIBBEY R, ZHAO X. 1823-P: The Beta-Cell Secretagogue Glyceraldehyde Induces Mitochondrial Leak Respiration, Not OXPHOS. Diabetes 2025, 74 DOI: 10.2337/db25-1823-p.Peer-Reviewed Original ResearchIncreased respirationSn-glycerol-3-phosphateMitochondrial leak respirationPlasma membrane permeabilizationMitochondria in situOligomycin-sensitive respirationMembrane permeabilizationATP synthesisMitochondrial respirationIN cellsDLGALeak respirationOXPHOSNADH oxidationGlyceraldehydeG3PStimulated respirationRespirationMitochondriaNADHPre-incubationInsulin releaseCells pre-incubatedSuccinateRotenone1824-P: Bioenergetic Advantage of Pyruvate Kinase Overcomes Mitochondrial OXPHOS in Beta-Cells to Initiate Insulin Secretion
RUZ-MALDONADO I, CARDONE R, MERRINS M, KIBBEY R. 1824-P: Bioenergetic Advantage of Pyruvate Kinase Overcomes Mitochondrial OXPHOS in Beta-Cells to Initiate Insulin Secretion. Diabetes 2025, 74 DOI: 10.2337/db25-1824-p.Peer-Reviewed Original ResearchPyruvate kinaseATP/ADP ratioMitochondrial OXPHOSHuman isletsBeta-cellsIntact miceOxygen consumption rateKATP channel closureInsulin secretionMitochondrial membrane potentialPlasma membrane depolarizationDose-dependent mannerIntramitochondrial ADPADP availabilityHyperpolarized mitochondriaInitial insulin secretionKATP channelsMitochondrial hyperpolarizationOXPHOS inhibitionINS-1Pyruvate metabolismETC complexesMembrane depolarizationATP synthesisOXPHOS1840-P: Pyruvate Kinase Bioenergetically Restricts OXPHOS in Beta Cells and Myotubules by Inducing Mitochondrial Membrane Hyperpolarization
DAVIDSON E, KIBBEY R. 1840-P: Pyruvate Kinase Bioenergetically Restricts OXPHOS in Beta Cells and Myotubules by Inducing Mitochondrial Membrane Hyperpolarization. Diabetes 2025, 74 DOI: 10.2337/db25-1840-p.Peer-Reviewed Original ResearchMitochondrial membrane potentialPyruvate kinaseHyperpolarization of mitochondrial membrane potentialRespiratory suppressionMitochondrial membrane potential differenceMitochondrial membrane hyperpolarizationCytosolic ATP/ADP ratioComplex V activityDigestive and Kidney DiseasesINS-1ATP hydrolysisATP synthesisPhosphoenolpyruvateMembrane hyperpolarizationPK substratesBlocking electron transportOXPHOSKidney diseaseATP/ADP ratioBeta cellsHyperpolarizationMembrane potentialPK activityState 3Oligos
2024
1734-P: ADP Privation of Human Beta-Cell Mitochondria by Pyruvate Kinase
RUZ-MALDONADO I, CARDONE R, KIBBEY R. 1734-P: ADP Privation of Human Beta-Cell Mitochondria by Pyruvate Kinase. Diabetes 2024, 73 DOI: 10.2337/db24-1734-p.Peer-Reviewed Original ResearchPyruvate kinaseBeta-cell mitochondriaInhibition of OxPhosBeta-cellsHuman beta-cellsModulation of enzymesIntramitochondrial ADPPhosphoenolpyruvate inhibitionADP availabilityADP/ATP exchangeKATP channelsPhosphoenolpyruvate metabolismOxidative phosphorylationPhosphoenolpyruvateMitochondrial functionOXPHOSSubstrate transportComplex IATP/ADP ratioHuman isletsMitochondrial couplingOxygen consumption ratePyruvateMitochondriaDose-dependent mannerGlucose Regulation of β-Cell KATP Channels: It Is Time for a New Model!
Merrins M, Kibbey R. Glucose Regulation of β-Cell KATP Channels: It Is Time for a New Model! Diabetes 2024, 73: 856-863. PMID: 38768366, PMCID: PMC11109790, DOI: 10.2337/dbi23-0032.Peer-Reviewed Original ResearchConceptsB-cell metabolismInsulin secretionEfficiency of mitochondrial ATP productionModel of glucose-stimulated insulin secretionGlucose-stimulated insulin secretionMitochondrial ATP productionNADPH productionGenetic evidenceInitial insulin secretionATP productionGlycolytic enzymesOXPHOSPyruvate kinaseATP/ADP ratioHealthy B cellsKATP channel closureB cellsDiabetes pathophysiologyGlycolysisStoichiometric yieldKATP channelsBioenergeticsATP/ADPMembrane depolarizationMetabolism
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