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Investigating the Molecular Mechanisms Underlying Pyridazine-Derivatives Enhanced Functional and Structural Plasticity of the Tripartite Synapse
Investigating the Molecular Mechanisms Underlying Pyridazine-Derivatives Enhanced Functional and Structural Plasticity of the Tripartite Synapse
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202105206
- ISBN
- 9798290954332
- DDC
- 616
- 저자명
- Xu, Zan Susan.
- 서명/저자
- Investigating the Molecular Mechanisms Underlying Pyridazine-Derivatives Enhanced Functional and Structural Plasticity of the Tripartite Synapse
- 발행사항
- [Sl] : The Ohio State University, 2023
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2023
- 형태사항
- 123 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-02, Section: B.
- 주기사항
- Advisor: Lin, Chien-liang Glenn.
- 학위논문주기
- Thesis (Ph.D.)--The Ohio State University, 2023.
- 초록/해제
- 요약Alzheimer's disease (AD) affects ~50 million people worldwide and still lacks effective therapeutic options. Studies indicate that loss of tripartite glutamatergic synapses is the major correlate of cognitive impairment in AD. The tripartite synapse consists of a presynaptic terminal, a postsynaptic spine, and a perisynaptic astrocytic process (PAP) that sheaths the synapse, enabling communication between neuron-neuron and neuron-astrocyte. Restoring tripartite glutamatergic synapse is a potential therapeutic strategy for AD. Our laboratory has discovered and developed a novel pyridazine-derivative compound series that can enhance the structure and function of tripartite glutamatergic synapses. We have demonstrated that our compounds can effectively restore tripartite glutamatergic synapses and significantly improve cognitive functions in two mouse models of AD. We have developed an optimized compound with good CNS drug properties as clinical candidate for clinical trial studies. However, the molecular mechanisms of action of our compounds remain to be fully elucidated. My dissertation research focuses on how our clinical candidate compound strengthens tripartite glutamatergic synapses. First, we investigated the initial effect of the compound on the plasma membrane of the tripartite synapse. Our findings indicate that this compound mediates a set of proteins localized to the plasma membrane of the PAP and synapse, leading to an enhancement of intercellular communication. This effect is dependent on PKA activation. Through proteomic analysis, we identified morphological changes, protein translation increases, and alterations in synaptic transmission as potential events occurring after compound mediated protein localization, indicating that these events are the outcome of enhanced intercellular communication. This study is presented in Chapter 2. Second, we investigated if the compound enhances intercellular communication at the tripartite synapse by increasing the release of extracellular vesicles (EVs). We first established the procedures to isolate EVs from mouse brains as well as from the medium of primary cultures prepared from embryonic brains. We then investigated the effects of the compound on EV release in both in vivo and in vitro paradigms. We observed increased the release of EVs after compound treatment in both paradigms. This study is presented in Chapter 3. Third, we studied the impact of our compound on tripartite synapse ultrastructure in hippocampus using a three-dimensional analysis from volume electron microscope images. We found that the compound increased the size of tertiary apical dendrites, the volume of mushroom spines, the proportion of mushroom spines containing spine apparatus, and alterations in the spine distribution across the surface area of tertiary dendrites. We also observed an increase in the number of PAP interacting with the mushroom spines as well as the size of the PAP in contact with the spines. Electrophysiological studies show increased long-term potentiation following compound treatment. This study is present in Chapter 4. In conclusion, this dissertation presents evidence of compound enhances intercellular communication between astrocyte and neuron and provides direct evidence that the compound enhances the structural and functional plasticity of the tripartite synapse.
- 일반주제명
- Neurosciences
- 일반주제명
- Psychology
- 일반주제명
- Medicine
- 일반주제명
- Cognitive psychology
- 키워드
- Small molecule
- 기타저자
- The Ohio State University Neuroscience Graduate Studies Program
- 기본자료저록
- Dissertations Abstracts International. 87-02B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■1001 ▼aXu, Zan Susan.
■24510▼aInvestigating the Molecular Mechanisms Underlying Pyridazine-Derivatives Enhanced Functional and Structural Plasticity of the Tripartite Synapse
■260 ▼a[Sl]▼bThe Ohio State University▼c2023
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2023
■300 ▼a123 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-02, Section: B.
■500 ▼aAdvisor: Lin, Chien-liang Glenn.
■5021 ▼aThesis (Ph.D.)--The Ohio State University, 2023.
■520 ▼aAlzheimer's disease (AD) affects ~50 million people worldwide and still lacks effective therapeutic options. Studies indicate that loss of tripartite glutamatergic synapses is the major correlate of cognitive impairment in AD. The tripartite synapse consists of a presynaptic terminal, a postsynaptic spine, and a perisynaptic astrocytic process (PAP) that sheaths the synapse, enabling communication between neuron-neuron and neuron-astrocyte. Restoring tripartite glutamatergic synapse is a potential therapeutic strategy for AD. Our laboratory has discovered and developed a novel pyridazine-derivative compound series that can enhance the structure and function of tripartite glutamatergic synapses. We have demonstrated that our compounds can effectively restore tripartite glutamatergic synapses and significantly improve cognitive functions in two mouse models of AD. We have developed an optimized compound with good CNS drug properties as clinical candidate for clinical trial studies. However, the molecular mechanisms of action of our compounds remain to be fully elucidated. My dissertation research focuses on how our clinical candidate compound strengthens tripartite glutamatergic synapses. First, we investigated the initial effect of the compound on the plasma membrane of the tripartite synapse. Our findings indicate that this compound mediates a set of proteins localized to the plasma membrane of the PAP and synapse, leading to an enhancement of intercellular communication. This effect is dependent on PKA activation. Through proteomic analysis, we identified morphological changes, protein translation increases, and alterations in synaptic transmission as potential events occurring after compound mediated protein localization, indicating that these events are the outcome of enhanced intercellular communication. This study is presented in Chapter 2. Second, we investigated if the compound enhances intercellular communication at the tripartite synapse by increasing the release of extracellular vesicles (EVs). We first established the procedures to isolate EVs from mouse brains as well as from the medium of primary cultures prepared from embryonic brains. We then investigated the effects of the compound on EV release in both in vivo and in vitro paradigms. We observed increased the release of EVs after compound treatment in both paradigms. This study is presented in Chapter 3. Third, we studied the impact of our compound on tripartite synapse ultrastructure in hippocampus using a three-dimensional analysis from volume electron microscope images. We found that the compound increased the size of tertiary apical dendrites, the volume of mushroom spines, the proportion of mushroom spines containing spine apparatus, and alterations in the spine distribution across the surface area of tertiary dendrites. We also observed an increase in the number of PAP interacting with the mushroom spines as well as the size of the PAP in contact with the spines. Electrophysiological studies show increased long-term potentiation following compound treatment. This study is present in Chapter 4. In conclusion, this dissertation presents evidence of compound enhances intercellular communication between astrocyte and neuron and provides direct evidence that the compound enhances the structural and functional plasticity of the tripartite synapse.
■590 ▼aSchool code: 0168.
■650 4▼aNeurosciences
■650 4▼aPsychology
■650 4▼aMedicine
■650 4▼aCognitive psychology
■653 ▼aAlzheimer's disease
■653 ▼aTripartite synapse
■653 ▼aSmall molecule
■653 ▼aElectron microscopy
■653 ▼aExtracellular vesicles
■690 ▼a0317
■690 ▼a0621
■690 ▼a0564
■690 ▼a0633
■71020▼aThe Ohio State University▼bNeuroscience Graduate Studies Program.
■7730 ▼tDissertations Abstracts International▼g87-02B.
■790 ▼a0168
■791 ▼aPh.D.
■792 ▼a2023
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17359737▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


