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Understanding the Mechanisms Regulating Neuronal Metabolic States In Vivo
Understanding the Mechanisms Regulating Neuronal Metabolic States In Vivo
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202103026
- ISBN
- 9798286442447
- DDC
- 574
- 저자명
- Singh, Milind.
- 서명/저자
- Understanding the Mechanisms Regulating Neuronal Metabolic States In Vivo
- 발행사항
- [Sl] : Yale University, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 139 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-12, Section: B.
- 주기사항
- Advisor: Colon-Ramos, Daniel.
- 학위논문주기
- Thesis (Ph.D.)--Yale University, 2025.
- 초록/해제
- 요약Glycolysis, a glucose-consuming pathway required for cellular energy production, is well conserved across species and has been extensively characterized biochemically. Less is understood regarding how it is subcellularly organized, or coordinated across tissues in vivo. Previous work from our lab found that during transient hypoxia or neuronal stimulation, the rate-limiting glycolytic enzyme phosphofructokinase-1 (PFK-1.1) dynamically re-localizes from the cytoplasm to condensates near synapses in C. elegans neurons. My research examined mechanisms by which PFK-1.1 localization is regulated in neurons, and resulted in two main findings: 1) PFK-1.1 condensate formation in neurons is regulated by a non-cell-autonomous signal derived from hypodermal (epidermal) cells and 2) Glycogen (which is also required for PFK-1.1 localization) is used by neurons to sustain metabolic plasticity.To determine regulation of PFK-1.1 condensate formation in neuron I examined the genetic lesions that affect PFK-1.1 localization. Using cell-specific rescues and HY-Light, a glycolytic sensor that detects the product of Phosphofructokinase, Fructose 1,6- bisphosphate (FBP) in vivo, I determined that non-cell autonomous disruption of glycolysis in hypodermal cells affects both PFK-1.1 condensate formation and FBP levels in neurons. Hypodermal cells in C. elegans are rich in metabolic genes and known to regulate metabolic processes. My data suggest that the state of glycolysis in the hypodermis signals, non- cell autonomously, to the neurons to regulate PFK-1.1 clustering, and metabolic state during transient hypoxia, and reveal mechanisms that are involved in cross-tissue metabolic state communication and cell biological organization of glycolytic proteins.Moreover, I identified a role for glycogen biosynthesis pathway in regulating PFK-1.1 localization. I investigated PYGL-1, an ortholog of glycogen phosphorylase. In PYGL-1 mutants, which inhibit glycogen breakdown, PFK-1.1 is incapable of forming condensates. Glycogen is the main form of energy storage in the brain, and is has been implicated in memory formation and as being neuroprotective under conditions of hypoxia. In the nervous system, glycogen is primarily considered to be utilized by glia, and how glycogen is used in vivo in neurons is not well understood. I investigated whether neurons can utilize glycogen to regulate their metabolic state. Using the HYLight biosensor I first determined that neurons can dynamically regulate glycolytic responses in response to activity or transient hypoxia, which I term glycolytic plasticity. I observed that the disruption of glycogen metabolism affected neuronal FBP levels at baseline, indicating decreased glycolytic flux. Furthermore, I show that glycogen is necessary for sustaining glycolytic plasticity during transient hypoxia. In mutant animals, neuron-specific expression of PYGL-1 was sufficient to restore metabolic responses to hypoxic stress. I determined that neurons employ at least two mechanisms of glycolytic plasticity: glycogen-dependent glycolytic plasticity (GDGP) and glycogen-independent glycolytic plasticity (GIDP). I uncovered that GDGP is employed under conditions of mitochondrial dysfunction, such as transient hypoxia or in mitochondrial mutants. The ability of neurons to plastically regulate glycolysis through cell-autonomous GDGP is important for 'sustaining synaptic function. My work reveals that in vivo, neurons can directly make use of glycogen as a fuel source to sustain context-specific regulation of glycolytic plasticity and synaptic function.
- 일반주제명
- Cellular biology
- 일반주제명
- Neurosciences
- 일반주제명
- Physiology
- 일반주제명
- Genetics
- 키워드
- Genetic lesions
- 기타저자
- Yale University Cell Biology
- 기본자료저록
- Dissertations Abstracts International. 86-12B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520260202103026
■006m o d
■007cr#unu||||||||
■020 ▼a9798286442447
■035 ▼a(MiAaPQ)AAI31845328
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a574
■1001 ▼aSingh, Milind.
■24510▼aUnderstanding the Mechanisms Regulating Neuronal Metabolic States In Vivo
■260 ▼a[Sl]▼bYale University▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a139 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-12, Section: B.
■500 ▼aAdvisor: Colon-Ramos, Daniel.
■5021 ▼aThesis (Ph.D.)--Yale University, 2025.
■520 ▼aGlycolysis, a glucose-consuming pathway required for cellular energy production, is well conserved across species and has been extensively characterized biochemically. Less is understood regarding how it is subcellularly organized, or coordinated across tissues in vivo. Previous work from our lab found that during transient hypoxia or neuronal stimulation, the rate-limiting glycolytic enzyme phosphofructokinase-1 (PFK-1.1) dynamically re-localizes from the cytoplasm to condensates near synapses in C. elegans neurons. My research examined mechanisms by which PFK-1.1 localization is regulated in neurons, and resulted in two main findings: 1) PFK-1.1 condensate formation in neurons is regulated by a non-cell-autonomous signal derived from hypodermal (epidermal) cells and 2) Glycogen (which is also required for PFK-1.1 localization) is used by neurons to sustain metabolic plasticity.To determine regulation of PFK-1.1 condensate formation in neuron I examined the genetic lesions that affect PFK-1.1 localization. Using cell-specific rescues and HY-Light, a glycolytic sensor that detects the product of Phosphofructokinase, Fructose 1,6- bisphosphate (FBP) in vivo, I determined that non-cell autonomous disruption of glycolysis in hypodermal cells affects both PFK-1.1 condensate formation and FBP levels in neurons. Hypodermal cells in C. elegans are rich in metabolic genes and known to regulate metabolic processes. My data suggest that the state of glycolysis in the hypodermis signals, non- cell autonomously, to the neurons to regulate PFK-1.1 clustering, and metabolic state during transient hypoxia, and reveal mechanisms that are involved in cross-tissue metabolic state communication and cell biological organization of glycolytic proteins.Moreover, I identified a role for glycogen biosynthesis pathway in regulating PFK-1.1 localization. I investigated PYGL-1, an ortholog of glycogen phosphorylase. In PYGL-1 mutants, which inhibit glycogen breakdown, PFK-1.1 is incapable of forming condensates. Glycogen is the main form of energy storage in the brain, and is has been implicated in memory formation and as being neuroprotective under conditions of hypoxia. In the nervous system, glycogen is primarily considered to be utilized by glia, and how glycogen is used in vivo in neurons is not well understood. I investigated whether neurons can utilize glycogen to regulate their metabolic state. Using the HYLight biosensor I first determined that neurons can dynamically regulate glycolytic responses in response to activity or transient hypoxia, which I term glycolytic plasticity. I observed that the disruption of glycogen metabolism affected neuronal FBP levels at baseline, indicating decreased glycolytic flux. Furthermore, I show that glycogen is necessary for sustaining glycolytic plasticity during transient hypoxia. In mutant animals, neuron-specific expression of PYGL-1 was sufficient to restore metabolic responses to hypoxic stress. I determined that neurons employ at least two mechanisms of glycolytic plasticity: glycogen-dependent glycolytic plasticity (GDGP) and glycogen-independent glycolytic plasticity (GIDP). I uncovered that GDGP is employed under conditions of mitochondrial dysfunction, such as transient hypoxia or in mitochondrial mutants. The ability of neurons to plastically regulate glycolysis through cell-autonomous GDGP is important for 'sustaining synaptic function. My work reveals that in vivo, neurons can directly make use of glycogen as a fuel source to sustain context-specific regulation of glycolytic plasticity and synaptic function.
■590 ▼aSchool code: 0265.
■650 4▼aCellular biology
■650 4▼aNeurosciences
■650 4▼aPhysiology
■650 4▼aGenetics
■653 ▼aCross-tissue metabolic
■653 ▼aGlycogen metabolism
■653 ▼aGenetic lesions
■653 ▼aGlycolytic plasticity
■653 ▼aNeuronal metabolism
■653 ▼aPFK-1.1 condensates
■690 ▼a0379
■690 ▼a0317
■690 ▼a0369
■690 ▼a0719
■71020▼aYale University▼bCell Biology.
■7730 ▼tDissertations Abstracts International▼g86-12B.
■790 ▼a0265
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17356738▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


