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心肌肥厚的早期分子机制-英文课件.ppt

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EarlyMolecularMechanismUnderlyingCardiacHypertrophyYouyiZhangInstituteofVascularMedicinePekingUniversityThirdHospital

12nm电压依赖L型钙通道Ca2+Ca2+LCCRyRSR钙池

PathologicalfactorsHormonesNeurotransmittersCytokinesForceFunctionmaintenanceHeartfailureCa2+

Ca2+Earlymolecularmechanismunderlyingcardiachypertrophy?1.Ca2+transientstriggeredbycomparableLCCcurrentsaredecreasedinamplitudeandslowedinheartfailure2.CompensatedhypertrophyshowsthatthecellularaspectsofE-CcouplingappeartobenormalThemoleculardetailsunderlyingdefectiveE-CcouplingremainunknownWhetherandwhentheintermolecularprocessofCICRismodified

AASPressure-OverloadHypertrophyModelInducedbyAorticStenosisHypertrophy4~7weeks

50?m-70mV0mV,300ms200ms1cmPWDControlDHT*****CHT*CharacterizetheCellularE-CCoupling

********RP+70mvRPRP+70mv100msRPLCC-RyRCouplingDuringHypertrophyPercentageofCa2+sparkstriggeredbythefirstCa2tsparkletsPercentageofdepolarizationpulsesthatoccurredwithouttriggeringanyCa2+sparks

50msCouplinglatencyControlCHTDHT***KineticsofLCC-RyRCoupling**TimeconstantforLCC-RyRcoupling

HowIsLCC-RyRIntermolecularFailureLinkedtotheGlobalPerformanceofE-CCoupling

?

Ca2+spikestendedtobedesynchronizedgihdefabc-70mV0mV10?mControlCHTDHTA50ms20?F/F0BDspikeadgbehcfi****ControlCHTDHTTimedelayfromdepolarizationtothepeakofeachCa2+spike

**CellularToleranceAgainstIntermolecularFailure

NumericalSimulationofStabilityMarginstabilitymarginstabilitymarginextendedNCDF

SeekingPotentialMechanismsUnderlyingtheIntermolecularFailure?

SRCa2+LoadinRestingCells

A LCC RyR OverlayConCHTDHTBLCC-RyROverlapping020406080100(%)ControlCHTDHTStructuralArrangementbetweenSRandCell/T-tubule

00.020.040.060.080.100.12ShamCHTmRNAexpression(JP-2/GAPDH)**Junctophilin2CaLCCRyrSRCa12nmPotentialMechanismofIntermolecularFailure

Research

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