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Retinal Encoding Is Shaped by GABAA Presynaptic Inhibition
Retinal Encoding Is Shaped by GABAA Presynaptic Inhibition
Retinal Encoding Is Shaped by GABAA Presynaptic Inhibition

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20260202104703
ISBN  
9798280770850
DDC  
616
저자명  
Nagy, Jenna.
서명/저자  
Retinal Encoding Is Shaped by GABAA Presynaptic Inhibition
발행사항  
[Sl] : The University of Wisconsin - Madison, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
95 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-12, Section: B.
주기사항  
Advisor: Sinha, Raunak.
학위논문주기  
Thesis (Ph.D.)--The University of Wisconsin - Madison, 2025.
초록/해제  
요약Inhibition regulates the output of neural circuits by modulating neuronal function at both the pre- and postsynapse. In the retina, presynaptic inhibition regulates neurotransmitter release from the axon terminals of second-order neurons, bipolar cells (BCs), and modifies feedforward signaling from BCs to retinal output neurons, ganglion cells (GCs). We know a great deal about the localization and molecular composition of GABA and Glycine receptors that mediate presynaptic inhibition at BC terminals. However, a lack of BC subtype specific perturbations has limited our understanding of how presynaptic inhibition shapes functional output across distinct retinal pathways. Here, we use a transgenic approach which eliminates axonal GABAA receptors from select BC types in mouse retina, resulting in enhanced sensitivity and slower kinetics of light-evoked GC responses. We test the effects of selective loss of GABAA presynaptic inhibition on GC adaptive processes underlying naturalistic visual processing in the behaviorally relevant ONα GC retinal circuit. We find that GABAA presynaptic inhibition shapes retinal circuit encoding of natural scenes by regulating adaptation to both luminance and contrast through mechanisms which alter the degree and speed the rate of gain depression in response to dynamic stimuli. We also find that presynaptic inhibition plays a major role in noise reduction across a wide range of background luminance. Finally, we provide evidence that GABAA presynaptic inhibition mediates these effects through regulation of BC short-term synaptic plasticity and tonic circuit activity.
일반주제명  
Neurosciences
일반주제명  
Ophthalmology
일반주제명  
Cellular biology
일반주제명  
Pathology
일반주제명  
Molecular biology
키워드  
GABAA receptors
키워드  
Mouse retina
키워드  
Presynaptic inhibition
키워드  
Retinal ganglion cell
기타저자  
The University of Wisconsin - Madison Neuroscience
기본자료저록  
Dissertations Abstracts International. 86-12B.
전자적 위치 및 접속  
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■1001  ▼aNagy,  Jenna.
■24510▼aRetinal  Encoding  Is  Shaped  by  GABAA  Presynaptic  Inhibition
■260    ▼a[Sl]▼bThe  University  of  Wisconsin  -  Madison▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a95  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-12,  Section:  B.
■500    ▼aAdvisor:  Sinha,  Raunak.
■5021  ▼aThesis  (Ph.D.)--The  University  of  Wisconsin  -  Madison,  2025.
■520    ▼aInhibition  regulates  the  output  of  neural  circuits  by  modulating  neuronal  function  at  both  the  pre-  and  postsynapse.  In  the  retina,  presynaptic  inhibition  regulates  neurotransmitter  release  from  the  axon  terminals  of  second-order  neurons,  bipolar  cells  (BCs),  and  modifies  feedforward  signaling  from  BCs  to  retinal  output  neurons,  ganglion  cells  (GCs).  We  know  a  great  deal  about  the  localization  and  molecular  composition  of  GABA  and  Glycine  receptors  that  mediate  presynaptic  inhibition  at  BC  terminals.  However,  a  lack  of  BC  subtype  specific  perturbations  has  limited  our  understanding  of  how  presynaptic  inhibition  shapes  functional  output  across  distinct  retinal  pathways.  Here,  we  use  a  transgenic  approach  which  eliminates  axonal  GABAA  receptors  from  select  BC  types  in  mouse  retina,  resulting  in  enhanced  sensitivity  and  slower  kinetics  of  light-evoked  GC  responses.  We  test  the  effects  of  selective  loss  of  GABAA  presynaptic  inhibition  on  GC  adaptive  processes  underlying  naturalistic  visual  processing  in  the  behaviorally  relevant  ONα  GC  retinal  circuit.  We  find  that  GABAA  presynaptic  inhibition  shapes  retinal  circuit  encoding  of  natural  scenes  by  regulating  adaptation  to  both  luminance  and  contrast  through  mechanisms  which  alter  the  degree  and  speed  the  rate  of  gain  depression  in  response  to  dynamic  stimuli.  We  also  find  that  presynaptic  inhibition  plays  a  major  role  in  noise  reduction  across  a  wide  range  of  background  luminance.  Finally,  we  provide  evidence  that  GABAA  presynaptic  inhibition  mediates  these  effects  through  regulation  of  BC  short-term  synaptic  plasticity  and  tonic  circuit  activity.
■590    ▼aSchool  code:  0262.
■650  4▼aNeurosciences
■650  4▼aOphthalmology
■650  4▼aCellular  biology
■650  4▼aPathology
■650  4▼aMolecular  biology
■653    ▼aGABAA  receptors
■653    ▼aMouse  retina
■653    ▼aPresynaptic  inhibition
■653    ▼aRetinal  ganglion  cell
■690    ▼a0317
■690    ▼a0379
■690    ▼a0381
■690    ▼a0307
■690    ▼a0571
■71020▼aThe  University  of  Wisconsin  -  Madison▼bNeuroscience.
■7730  ▼tDissertations  Abstracts  International▼g86-12B.
■790    ▼a0262
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17358440▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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