The contributions of excitation and contraction to muscle deterioration in a Drosophila model of CFL2 nemaline myopathy
兴奋和收缩对 CFL2 线状肌病果蝇模型肌肉退化的贡献
基本信息
- 批准号:10605858
- 负责人:
- 金额:$ 5.11万
- 依托单位:
- 依托单位国家:美国
- 项目类别:
- 财政年份:2023
- 资助国家:美国
- 起止时间:2023-07-01 至 2027-06-30
- 项目状态:未结题
- 来源:
- 关键词:Actin-Binding ProteinActinsAction PotentialsAddressAffectBasic ScienceBindingBiochemicalBiologyBiopsyBirthCalciumCalcium SignalingCell MaintenanceCellsCharacteristicsChildhoodClinicalClinical TreatmentCommunicationComplementCouplingCytoplasmDataDefectDeteriorationDevelopmentDiagnosisDiseaseDrosophila genusDrosophila melanogasterElectromyographyElectronsElectrophysiology (science)EventExerciseFunctional disorderGenesGrowthHistopathologyHumanImage AnalysisImaging TechniquesIncidenceIonsKnockout MiceLarvaLifeLinkLiteratureLive BirthMechanicsMembraneMembrane PotentialsMicrofilamentsMicroscopyModelingMolecularMorphologyMotor NeuronsMusMuscleMuscle CellsMuscle ContractionMuscle WeaknessMuscle functionMuscle hypotoniaMuscular AtrophyMyopathyMyosin ATPaseNemaline MyopathiesNeuromuscular JunctionNeuronsNeurotransmitter ReceptorOrganismOutputPathologyPatientsPatternPediatricsPhenotypePhysical shapePhysiciansPlayPreparationProcessProtein IsoformsProteinsRegulationResearchResearch PersonnelRodRoleSamplingSarcomeresSarcoplasmic ReticulumScientistSideSignal TransductionSkeletal MuscleStructureSynapsesSystemTechnical ExpertiseTechniquesTestingTrainingWorkcausal variantcofilincofilin 2confocal imagingdifferential expressionearly childhoodexercise intensityexercise regimenexperimental studyfluorescence imaginggenetic manipulationhuman diseaseinnovationinsightinterestknock-downneuronal patterningneurotransmitter releasenovel therapeuticsperinatal periodpostnatalpostsynapticreceptorresponseskeletal muscle weaknesstranscriptome sequencingultra high resolution
项目摘要
PROJECT SUMMARY
Nemaline myopathy (NM) is a skeletal muscle disease hallmarked by muscle weakness with an incidence of 1
in 50,000 live births. On histopathology, there is an obvious presence of actin accumulations in disrupted muscle.
The causative mutations identified thus far are in genes critical for actin filament structure within the muscle, yet
the molecular mechanisms for how alteration of these proteins leads to NM pathology is not well understood.
Cofilin-2, which is important for actin filament severing, is one such affected actin-binding protein. This cofilin
isoform is the predominant form in postnatal and mature skeletal muscle; its function has mainly been studied
with respect to actin at the sarcomere, the muscle’s main contractile unit. Cofilin-2 is known to biochemically
bind more readily to cytoplasmic non-sarcomeric actin than sarcomeric actin, but the impact of this characteristic
on NM progression has not been studied. A Drosophila model of muscle-specific cofilin (DmCFL) knockdown
was shown by our lab to have progressive muscular defects linked to sarcomere addition during growth. I
analyzed RNA sequencing data produced from muscle-enriched preparation of the DmCFL knockdown model
and found that genes associated with excitation-contraction coupling (ECC) are differentially expressed. ECC is
the process by which signals from the motor neuron are communicated to the muscle ultimately leading to
contraction. My preliminary data show disordered actin organization at the muscle side of the neuromuscular
junction (NMJ), which is where the muscle receives signals from the motor neuron. Based on the literature and
these preliminary findings, I hypothesize that cofilin regulation of non-sarcomeric actin is critical for the
proper NMJ and contraction machinery structure needed for ECC prior to muscle deterioration. To
address this hypothesis, I will use the DmCFL knockdown model to analyze the impact of decreased cofilin on
the NMJ signal transduction (Aim 1) and muscle contraction (Aim 2). The former will be accomplished by
using molecular, microscopy, and electrophysiological techniques to analyze changes in NMJ protein
localization, morphology, and function at the muscle (Aim 1A) and motor neuron (Aim 1B). I will compare the
morphological findings from Drosophila larval muscle to those from cofilin-2 knockout mouse muscle samples.
Contraction will be assessed using fluorescent imaging techniques targeted to the calcium signaling machinery
(Aim 2A). Using a modified exercise approach (Aim 2B), I will discover how exercise intensity influences
contraction and phenotype progression in DmCFL knockdown larva. These experiments will collectively provide
insight into the status of the NMJ and contractile activity in cofilin NM while leveraging the simplicity yet high
level of evolutionary conservation of Drosophila. In answering this question relevant to a clinical disease
that typically manifests early in life, I will further develop the technical skills and scientific reasoning
needed as a cell and developmental biologist. These studies will complement my clinical activities as I train
to become a well-rounded physician-scientist and independent investigator interested in pediatrics.
项目概要
线状肌病 (NM) 是一种以肌肉无力为特征的骨骼肌疾病,发病率为 1
50,000 名活产婴儿。在组织病理学上,受损肌肉中明显存在肌动蛋白积聚。
迄今为止发现的致病突变位于对肌肉内肌动蛋白丝结构至关重要的基因中,但
这些蛋白质的改变如何导致 NM 病理的分子机制尚不清楚。
Cofilin-2 对肌动蛋白丝的切断很重要,它就是一种受影响的肌动蛋白结合蛋白。这种丝切蛋白
同工型是出生后和成熟骨骼肌的主要形式;主要研究了其功能
关于肌节的肌动蛋白,肌节是肌肉的主要收缩单位。 Cofilin-2 已知在生物化学上
与肌节肌动蛋白相比,更容易与细胞质非肌节肌动蛋白结合,但这一特性的影响
尚未研究 NM 进展。肌肉特异性丝切蛋白 (DmCFL) 敲低的果蝇模型
我们的实验室表明,在生长过程中存在与肌节添加相关的渐进性肌肉缺陷。我
分析了 DmCFL 敲除模型的肌肉富集制剂产生的 RNA 测序数据
并发现与兴奋-收缩耦合(ECC)相关的基因存在差异表达。 ECC 是
来自运动神经元的信号传递到肌肉的过程,最终导致
收缩。我的初步数据显示神经肌肉的肌肉侧肌动蛋白组织紊乱
连接点(NMJ),这是肌肉接收来自运动神经元的信号的地方。根据文献和
根据这些初步发现,我假设丝切蛋白对非肌节肌动蛋白的调节对于
在肌肉退化之前,ECC 需要适当的 NMJ 和收缩机械结构。到
为了解决这个假设,我将使用 DmCFL 敲低模型来分析 cofilin 减少对
NMJ 信号转导(目标 1)和肌肉收缩(目标 2)。前者将通过以下方式完成
使用分子、显微镜和电生理技术分析 NMJ 蛋白的变化
肌肉(目标 1A)和运动神经元(目标 1B)的定位、形态和功能。我将比较
果蝇幼虫肌肉的形态学发现与 cofilin-2 敲除小鼠肌肉样本的形态学发现。
将使用针对钙信号机制的荧光成像技术来评估收缩
(目标 2A)。使用修改后的锻炼方法(目标 2B),我将发现锻炼强度如何影响
DmCFL 敲低幼虫的收缩和表型进展。这些实验将共同提供
洞察 NMJ 的状态和 cofilin NM 的收缩活动,同时利用简单而高效的方法
果蝇的进化保护水平。在回答这个与临床疾病相关的问题时
这通常在生命早期表现出来,我将进一步发展技术技能和科学推理
作为细胞和发育生物学家所需要的。这些研究将补充我训练时的临床活动
成为一名对儿科感兴趣的全面的医师科学家和独立研究者。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Briana Christophers其他文献
Briana Christophers的其他文献
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