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Selective Vulnerability of Spiral Ganglion Neuronal Subtypes to Noise-Induced Synaptopathy in the Cochlea
Selective Vulnerability of Spiral Ganglion Neuronal Subtypes to Noise-Induced Synaptopathy...
Selective Vulnerability of Spiral Ganglion Neuronal Subtypes to Noise-Induced Synaptopathy in the Cochlea

Detailed Information

자료유형  
 학위논문 서양
최종처리일시  
20260202105140
ISBN  
9798265410108
DDC  
616
저자명  
Copeland, Taylor Glynn.
서명/저자  
Selective Vulnerability of Spiral Ganglion Neuronal Subtypes to Noise-Induced Synaptopathy in the Cochlea
발행사항  
[Sl] : Harvard University, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
104 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-05, Section: B.
주기사항  
Advisor: Goodrich, Lisa V.
학위논문주기  
Thesis (Ph.D.)--Harvard University, 2025.
초록/해제  
요약We are bombarded with noise in our daily environment from the moment we wake up to a blasting alarm clock to the TV we may unwind to at the end of the night. This constant assault to our ears has both acute and chronic consequences. While seemingly harmless, moderate but prolonged noise exposures are sufficient to damage the synapse between sensory hair cells (IHCs) and their postsynaptic Spiral Ganglion Neurons (SGNs). This type of sensorineural hearing loss (SNHL) is marked by difficulty with complex auditory tasks such as detecting speech in a noisy restaurant, despite normal detection thresholds. Physiological and anatomical studies of noise-induced synaptopathy point to a subset of SGNs with the highest threshold as the primary target of acoustic trauma (AT). Due to the dynamic changes that are known to occur at the IHC-SGN synapses in response to AT, these methods are limited in their ability to confidently assign SGNs to their respective subpopulations post-exposure. To definitively determine whether there is differential vulnerability of SGN subtypes to noise, we used 3 separate transgenic mouse lines to molecularly label SGN subtypes: Netring1Cre;Ai14 to label high- and medium-threshold SGNs, the Calb2CreERT2 mouse line to label low- and medium-thresholds SGNs, and Lypd1CreERT2 to label high-threshold SGNs. After comparing noise-induced synaptopathy associated with labeled SGNs across these 3 lines, we were able to confirm the selective vulnerability of synapses of high-threshold SGNs, as predicted by previous studies. Next, we wanted to determine whether a shift in the molecular identity of these more vulnerable SGNs to that of the more resilient low threshold SGNs via the conditional knock-out of Runx1 offers protection from noise-induced synaptopathy. We found that Runx1CKO mice had similar threshold shifts to controls after AT but retained more synapses per HC at high frequencies. Here, we show that low threshold SGNs are more resilient to AT and the expansion of this subpopulation may have a protective effect.  .
일반주제명  
Neurosciences
일반주제명  
Cellular biology
일반주제명  
Molecular biology
키워드  
Acoustic trauma
키워드  
Spiral Ganglion Neurons
키워드  
Transgenic mouse lines
키워드  
Noise-induced synaptopathy
기타저자  
Harvard University Speech and Hearing Bioscience and Technology
기본자료저록  
Dissertations Abstracts International. 87-05B.
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

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■035    ▼a(MiAaPQ)AAI32240578
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a616
■1001  ▼aCopeland,  Taylor  Glynn.
■24510▼aSelective  Vulnerability  of  Spiral  Ganglion  Neuronal  Subtypes  to  Noise-Induced  Synaptopathy  in  the  Cochlea
■260    ▼a[Sl]▼bHarvard  University▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a104  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-05,  Section:  B.
■500    ▼aAdvisor:  Goodrich,  Lisa  V.
■5021  ▼aThesis  (Ph.D.)--Harvard  University,  2025.
■520    ▼aWe  are  bombarded  with  noise  in  our  daily  environment  from  the  moment  we  wake  up  to  a  blasting  alarm  clock  to  the  TV  we  may  unwind  to  at  the  end  of  the  night.  This  constant  assault  to  our  ears  has  both  acute  and  chronic  consequences.  While  seemingly  harmless,  moderate  but  prolonged  noise  exposures  are  sufficient  to  damage  the  synapse  between  sensory  hair  cells  (IHCs)  and  their  postsynaptic  Spiral  Ganglion  Neurons  (SGNs).  This  type  of  sensorineural  hearing  loss  (SNHL)  is  marked  by  difficulty  with  complex  auditory  tasks  such  as  detecting  speech  in  a  noisy  restaurant,  despite  normal  detection  thresholds.  Physiological  and  anatomical  studies  of  noise-induced  synaptopathy  point  to  a  subset  of  SGNs  with  the  highest  threshold  as  the  primary  target  of  acoustic  trauma  (AT).  Due  to  the  dynamic  changes  that  are  known  to  occur  at  the  IHC-SGN  synapses  in  response  to  AT,  these  methods  are  limited  in  their  ability  to  confidently  assign  SGNs  to  their  respective  subpopulations  post-exposure.  To  definitively  determine  whether  there  is  differential  vulnerability  of  SGN  subtypes  to  noise,  we  used  3  separate  transgenic  mouse  lines  to  molecularly  label  SGN  subtypes:  Netring1Cre;Ai14  to  label  high-  and  medium-threshold  SGNs,  the  Calb2CreERT2  mouse  line  to  label  low-  and  medium-thresholds  SGNs,  and  Lypd1CreERT2  to  label  high-threshold  SGNs.  After  comparing  noise-induced  synaptopathy  associated  with  labeled  SGNs  across  these  3  lines,  we  were  able  to  confirm  the  selective  vulnerability  of  synapses  of  high-threshold  SGNs,  as  predicted  by  previous  studies.  Next,  we  wanted  to  determine  whether  a  shift  in  the  molecular  identity  of  these  more  vulnerable  SGNs  to  that  of  the  more  resilient  low  threshold  SGNs  via  the  conditional  knock-out  of  Runx1  offers  protection  from  noise-induced  synaptopathy.  We  found  that  Runx1CKO  mice  had  similar  threshold  shifts  to  controls  after  AT  but  retained  more  synapses  per  HC  at  high  frequencies.  Here,  we  show  that  low  threshold  SGNs  are  more  resilient  to  AT  and  the  expansion  of  this  subpopulation  may  have  a  protective  effect.   .
■590    ▼aSchool  code:  0084.
■650  4▼aNeurosciences
■650  4▼aCellular  biology
■650  4▼aMolecular  biology
■653    ▼aAcoustic  trauma
■653    ▼aSpiral  Ganglion  Neurons
■653    ▼aTransgenic  mouse  lines  
■653    ▼aNoise-induced  synaptopathy
■690    ▼a0317
■690    ▼a0379
■690    ▼a0307
■71020▼aHarvard  University▼bSpeech  and  Hearing  Bioscience  and  Technology.
■7730  ▼tDissertations  Abstracts  International▼g87-05B.
■790    ▼a0084
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17359576▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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