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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 Function...
Investigating the Molecular Mechanisms Underlying Pyridazine-Derivatives Enhanced Functional and Structural Plasticity of the Tripartite Synapse

Detailed Information

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  
Alzheimer's disease
키워드  
Tripartite synapse
키워드  
Small molecule
키워드  
Electron microscopy
키워드  
Extracellular vesicles
기타저자  
The Ohio State University Neuroscience Graduate Studies Program
기본자료저록  
Dissertations Abstracts International. 87-02B.
전자적 위치 및 접속  
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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.

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