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Targeting Developmental and Inflammatory Factors to Enhance the Neurogenic Potential of Muller Glia
Targeting Developmental and Inflammatory Factors to Enhance the Neurogenic Potential of Muller Glia
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202103655
- ISBN
- 9798314889848
- DDC
- 616
- 서명/저자
- Targeting Developmental and Inflammatory Factors to Enhance the Neurogenic Potential of Muller Glia
- 발행사항
- [Sl] : The Ohio State University, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 214 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-11, Section: B.
- 주기사항
- Advisor: Fischer, Andy J.
- 학위논문주기
- Thesis (Ph.D.)--The Ohio State University, 2025.
- 초록/해제
- 요약Retinal degeneration, resulting in death of retinal neurons, is a leading cause of irreversible blindness. In non-mammalian vertebrates, Muller glia are promising targets for regeneration, due to their ability to reprogram into progenitor-like cells (MGPCs) and differentiate into retinal neurons to restore sight in cold-blooded vertebrates. Following acute retinal injury, Muller glia are capable of de-differentiating into progenitor-like cells (MGPCs), proliferating, and adopting a neural fate to replace dying neurons. This process is efficient in zebrafish, wherein Muller glia rapidly reprogram to functionally restore vision after ablation of any type of retinal neuron. In the mammalian retina, Muller glia fail to de-differentiate and instead upregulate an inflammatory gliotic program in response to retinal injury. The mature chick retina serves as a unique intermediate between these opposing models; chick Muller glia respond to acute damage by dedifferentiating and proliferating, but less than 5% of MGPCs adopt neural fate. Thus, the chick retina is an ideal "stepping stone model" for identifying a) what molecular processes are necessary and sufficient for MGPC formation, and b) what molecular processes must be manipulated for sufficient neurogenesis to occur. Further, comparing how these molecular processes are regulated in zebrafish, avian, and murine retinas leads to novel insights that may contribute to future clinical treatments for reversing vision loss in human patients with retinal diseases. The primary focus of this dissertation is to understand the interplay of developmental factors and inflammatory signaling pathways in regulating Muller glia reprogramming and neuroprotection in the chick and murine retina. The first data chapter focuses on Inhibitor of DNA-binding (Id) transcription factors, a family of transcription factors which inhibit E protein binding. Id factors are expressed dynamically in embryonic retinal progenitor cells, Muller glia, and MGPCs in the chick retina. We find that applying a pan-Id antagonist to retinas prior to excitotoxic retinal damage stunts MGPC proliferation, lowers expression of M-phase markers, and increases expression of cell cycle inhibitors. However, we find that applying the Id inhibitor following MGPC induction significantly increases the abundance of MG-derived amacrine-like cells. We report that Id factor expression is responsive to insulin and FGF, IL1β, STAT inhibitor, and Notch inhibitor treatments. Finally, we show how Id factors are expressed in the zebrafish retina. The second data chapter focuses on the inflammatory sphingosine 1-phosphate (S1P) signaling pathway, which shows conserved transcription patterns in zebrafish, chick, and human Muller glia. We describe how this pathway is dynamically regulated in the chick retina and coordinates with other pathways to suppress Muller glia proliferation and neurogenesis. We find that application of small molecule inhibitors to S1P synthesis or S1P receptor 1 (S1pr1) activation robustly enhances MGPC proliferation in a damaged retina and modestly promotes neuronal differentiation of MGPCs. In the absence of microglia, wherein the formation of MGPCs in damaged retinas is refractory, S1P-related gene expression is significantly impacted. Inhibiting S1P synthesis or S1pr1 is sufficient to partially recover MGPC proliferation in damaged retinas missing microglia. Finally, we find that S1pr1 is regulated by TGFβ/Smad3 activity, linking microglia signaling to S1P activation in MG. The third and final data chapter continues our investigation of the role of S1P in regulating neuroprotection and the reprogramming of MG in the mouse retina. We report dynamic expression patterns of S1pr1 and Sphk1 in MG following NMDA-injury. We find that overexpression of bHLH transcription factor Ascl1 in MG partially downregulates S1pr1 expression, and that inhibition of Sphk1 and S1pr1/3 promotes Ascl1-driven regeneration of bipolar-like cells in injured retinas. Finally, using transgenic mice with a conditional knockout of S1pr1 or Sphk1 in MG, we report how S1P:S1pr1 signaling regulates neuroprotection and immune cell recruitment in injured retinas. Collectively, the work outlined in these chapters contributes to our understanding of the molecular mechanisms governing Muller glia reprogramming, providing insights for future therapeutic strategies of retinal regeneration in humans with retinal diseases.
- 일반주제명
- Neurosciences
- 일반주제명
- Ophthalmology
- 일반주제명
- Developmental biology
- 키워드
- Muller glia
- 키워드
- Retina
- 키워드
- Regeneration
- 키워드
- Inflammation
- 기타저자
- The Ohio State University Neuroscience Graduate Studies Program
- 기본자료저록
- Dissertations Abstracts International. 86-11B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■1001 ▼aTaylor, Olivia B.
■24510▼aTargeting Developmental and Inflammatory Factors to Enhance the Neurogenic Potential of Muller Glia
■260 ▼a[Sl]▼bThe Ohio State University▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a214 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-11, Section: B.
■500 ▼aAdvisor: Fischer, Andy J.
■5021 ▼aThesis (Ph.D.)--The Ohio State University, 2025.
■520 ▼aRetinal degeneration, resulting in death of retinal neurons, is a leading cause of irreversible blindness. In non-mammalian vertebrates, Muller glia are promising targets for regeneration, due to their ability to reprogram into progenitor-like cells (MGPCs) and differentiate into retinal neurons to restore sight in cold-blooded vertebrates. Following acute retinal injury, Muller glia are capable of de-differentiating into progenitor-like cells (MGPCs), proliferating, and adopting a neural fate to replace dying neurons. This process is efficient in zebrafish, wherein Muller glia rapidly reprogram to functionally restore vision after ablation of any type of retinal neuron. In the mammalian retina, Muller glia fail to de-differentiate and instead upregulate an inflammatory gliotic program in response to retinal injury. The mature chick retina serves as a unique intermediate between these opposing models; chick Muller glia respond to acute damage by dedifferentiating and proliferating, but less than 5% of MGPCs adopt neural fate. Thus, the chick retina is an ideal "stepping stone model" for identifying a) what molecular processes are necessary and sufficient for MGPC formation, and b) what molecular processes must be manipulated for sufficient neurogenesis to occur. Further, comparing how these molecular processes are regulated in zebrafish, avian, and murine retinas leads to novel insights that may contribute to future clinical treatments for reversing vision loss in human patients with retinal diseases. The primary focus of this dissertation is to understand the interplay of developmental factors and inflammatory signaling pathways in regulating Muller glia reprogramming and neuroprotection in the chick and murine retina. The first data chapter focuses on Inhibitor of DNA-binding (Id) transcription factors, a family of transcription factors which inhibit E protein binding. Id factors are expressed dynamically in embryonic retinal progenitor cells, Muller glia, and MGPCs in the chick retina. We find that applying a pan-Id antagonist to retinas prior to excitotoxic retinal damage stunts MGPC proliferation, lowers expression of M-phase markers, and increases expression of cell cycle inhibitors. However, we find that applying the Id inhibitor following MGPC induction significantly increases the abundance of MG-derived amacrine-like cells. We report that Id factor expression is responsive to insulin and FGF, IL1β, STAT inhibitor, and Notch inhibitor treatments. Finally, we show how Id factors are expressed in the zebrafish retina. The second data chapter focuses on the inflammatory sphingosine 1-phosphate (S1P) signaling pathway, which shows conserved transcription patterns in zebrafish, chick, and human Muller glia. We describe how this pathway is dynamically regulated in the chick retina and coordinates with other pathways to suppress Muller glia proliferation and neurogenesis. We find that application of small molecule inhibitors to S1P synthesis or S1P receptor 1 (S1pr1) activation robustly enhances MGPC proliferation in a damaged retina and modestly promotes neuronal differentiation of MGPCs. In the absence of microglia, wherein the formation of MGPCs in damaged retinas is refractory, S1P-related gene expression is significantly impacted. Inhibiting S1P synthesis or S1pr1 is sufficient to partially recover MGPC proliferation in damaged retinas missing microglia. Finally, we find that S1pr1 is regulated by TGFβ/Smad3 activity, linking microglia signaling to S1P activation in MG. The third and final data chapter continues our investigation of the role of S1P in regulating neuroprotection and the reprogramming of MG in the mouse retina. We report dynamic expression patterns of S1pr1 and Sphk1 in MG following NMDA-injury. We find that overexpression of bHLH transcription factor Ascl1 in MG partially downregulates S1pr1 expression, and that inhibition of Sphk1 and S1pr1/3 promotes Ascl1-driven regeneration of bipolar-like cells in injured retinas. Finally, using transgenic mice with a conditional knockout of S1pr1 or Sphk1 in MG, we report how S1P:S1pr1 signaling regulates neuroprotection and immune cell recruitment in injured retinas. Collectively, the work outlined in these chapters contributes to our understanding of the molecular mechanisms governing Muller glia reprogramming, providing insights for future therapeutic strategies of retinal regeneration in humans with retinal diseases.
■590 ▼aSchool code: 0168.
■650 4▼aNeurosciences
■650 4▼aOphthalmology
■650 4▼aDevelopmental biology
■653 ▼aMuller glia
■653 ▼aRetina
■653 ▼aRegeneration
■653 ▼aInflammation
■653 ▼aDevelopmental factors
■690 ▼a0317
■690 ▼a0381
■690 ▼a0758
■71020▼aThe Ohio State University▼bNeuroscience Graduate Studies Program.
■7730 ▼tDissertations Abstracts International▼g86-11B.
■790 ▼a0168
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17358175▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


