Therapeutic Potential and Mechanisms of Tau Reduction in Autism Models
自闭症模型中 Tau 蛋白减少的治疗潜力和机制
基本信息
- 批准号:10158269
- 负责人:
- 金额:$ 71.71万
- 依托单位:
- 依托单位国家:美国
- 项目类别:
- 财政年份:2018
- 资助国家:美国
- 起止时间:2018-07-03 至 2023-04-30
- 项目状态:已结题
- 来源:
- 关键词:AblationAddressAdultAdverse effectsAffectAgeAnatomyAntisense OligonucleotidesBehaviorBehavioralBehavioral SymptomsBrainBrain regionCerebrumChildCognitive deficitsCommunicationCorpus striatum structureDataDevelopmentDiagnosisDiseaseDisease modelElectrophysiology (science)ElementsEpidemicEpilepsyFRAP1 geneFamilyGeneticHistologicHumanImpairmentInjectionsInterventionIntractable EpilepsyLifeLifestyle-related conditionLightLinkLongevityMAPT geneMediatingMethodsMicrotubule-Associated ProteinsModelingMolecularMorphologyMusMutationNeurodegenerative DisordersNeuronsPTEN genePathogenesisPathway interactionsPatientsPharmaceutical PreparationsPharmacologyPhysiologicalPopulationPrefrontal CortexPremature MortalityPreventionProcessPropertyRefractoryRoleSeizuresSignaling MoleculeSocial InteractionSymptomsSynapsesSyndromeTestingTherapeuticTherapeutic InterventionTimeUnited StatesViralautism spectrum disorderbehavioral impairmentbehavioral phenotypingclinical developmentdisabilitydisorder subtypedravet syndromeearly childhoodeffective therapyepileptic encephalopathiesexperimental studyindividuals with autism spectrum disorderinnovationinsightknock-downloss of function mutationmouse modelnetwork dysfunctionneural networknovel strategiesoptogeneticspreventrepetitive behaviorsocialsocial deficitstau Proteinstau expressiontreatment strategy
项目摘要
PROJECT SUMMARY
The autism spectrum disorders (ASDs) affect 1% of the world’s population. The syndromes in this diverse
family of disorders share three core features: impaired social interactions, communication deficits, and
repetitive behaviors. In the United States, 1 in 68 children are now diagnosed with ASDs, a drastic increase
over the last few decades. Despite the perceived “epidemic” of ASDs, there are few effective treatments. In
roughly 30% of patients, ASD is associated with epilepsy that is often also refractory to available treatments.
Thus, there is an urgent need to develop better treatments for these challenging conditions.
The core symptoms of ASDs are common in Dravet syndrome, an intractable epilepsy with onset in early
childhood. We recently demonstrated that genetic reduction of tau, a microtubule-associated protein implicated
in neurodegenerative disorders, prevents or markedly reduces epileptic seizures, cognitive deficits, and
premature mortality in a model of Dravet syndrome (Scn1aRX/+ mice). More surprisingly, we found that tau
reduction ameliorated social impairments, communication deficits, and repetitive behaviors in these mice.
Genetic reduction of tau also ameliorated similar communication deficits and repetitive behaviors in a separate
model of ASD (Cntnap2–/– mice). Encouragingly, genetic tau reduction was well tolerated throughout the
lifespan, tau knockdown initiated in adulthood also did not cause obvious adverse effects, and complete
ablation was not necessary, as even partial tau reduction provided substantial benefit. These data led to our
central hypothesis that tau reduction counteracts ASD pathogenesis and may be developed into an
effective treatment for several of these conditions.
However, several key issues must be resolved before this strategy is ready for clinical development. To
determine whether ASD subtypes that do not include epilepsy may benefit from such a treatment approach, we
will examine whether genetic ablation of tau prevents or reduces autism-like behaviors in a third independent
mouse model of genetically determined ASD that does not develop epilepsy, Shank3B–/– mice. In addition, an
ideal ASD therapy would be effective even if it was administered after symptoms become apparent. To test this
possibility, we will knock down cerebral tau expression in Scn1aRX/+ mice with antisense oligonucleotides after
autism-like behaviors have become manifest. Finally, we will test hypotheses about the molecular, cellular, and
circuit mechanisms by which tau reduction counteracts the core symptoms of ASD. In the long run, our aim is
to enable tau reduction to be developed into a treatment for multiple ASDs. By determining the consequences
of tau reduction on molecular regulators of development, circuit connectivity, and neuronal properties, we may
also identify additional entry points for therapeutic intervention, to the benefit of patients affected by ASDs or
other devastating diseases associated with tau-dependent neural network dysfunction.
项目摘要
自闭症谱系障碍(ASD)影响世界人口的1%。
家族性疾病共有三个核心特征:社会交往障碍,沟通障碍,
在美国,68个孩子中就有1个被诊断为自闭症,
在过去的几十年里。尽管ASD被认为是“流行病”,但几乎没有有效的治疗方法。
在大约30%的患者中,ASD与癫痫相关,癫痫通常也对可用的治疗无效。
因此,迫切需要为这些具有挑战性的疾病开发更好的治疗方法。
ASD的核心症状在Dravet综合征中很常见,Dravet综合征是一种难治性癫痫,
我们最近证明,tau蛋白(一种微管相关蛋白,
在神经退行性疾病中,预防或显著减少癫痫发作、认知缺陷,
Dravet综合征模型(Scn 1aRX/+小鼠)的过早死亡。更令人惊讶的是,我们发现tau蛋白
减少这些小鼠的社交障碍、交流缺陷和重复行为。
tau蛋白的遗传减少也改善了单独研究中类似的沟通缺陷和重复行为。
令人鼓舞的是,遗传tau蛋白减少在整个实验过程中耐受良好。
在成年期启动的tau敲低也没有引起明显的不良影响,并且完全
消融是不必要的,因为即使是部分tau蛋白减少也提供了实质性的益处。这些数据导致我们
tau蛋白减少抵消ASD发病机制,并可能发展成为一个重要的假设,
有效治疗这些疾病。
然而,在该策略准备好用于临床开发之前,必须解决几个关键问题。
为了确定不包括癫痫的ASD亚型是否可以从这种治疗方法中获益,我们
将在第三个独立的研究中研究tau蛋白的基因切除是否能预防或减少自闭症样行为。
小鼠模型的遗传决定的ASD,不发展癫痫,Shank 3B-/-小鼠。
理想的ASD治疗即使是在症状明显后进行,也是有效的。
我们将有可能用反义寡核苷酸敲低Scn 1aRX/+小鼠脑tau蛋白的表达,
最后,我们将测试关于自闭症的分子、细胞和遗传学的假设。
tau蛋白减少抵消ASD核心症状的电路机制。从长远来看,我们的目标是
以使tau蛋白减少能够发展成为多种ASD的治疗方法。
tau蛋白减少对发育,电路连接和神经元特性的分子调节剂的影响,我们可以
还确定了治疗干预的其他切入点,以使ASD患者受益,
其他与tau蛋白依赖性神经网络功能障碍相关的毁灭性疾病。
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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Lennart Mucke其他文献
Lennart Mucke的其他文献
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