서브메뉴
검색
Quantifying the Limits of Tau PET in Detecting Early Alzheimer's Disease
Quantifying the Limits of Tau PET in Detecting Early Alzheimer's Disease
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202105314
- ISBN
- 9798265430472
- DDC
- 616
- 저자명
- McVea, Andrew.
- 서명/저자
- Quantifying the Limits of Tau PET in Detecting Early Alzheimers Disease
- 발행사항
- [Sl] : The University of Wisconsin - Madison, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 168 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-05, Section: B.
- 주기사항
- Advisor: Christian, Bradely T.
- 학위논문주기
- Thesis (Ph.D.)--The University of Wisconsin - Madison, 2025.
- 초록/해제
- 요약Alzheimer's disease (AD) is a neurodegenerative disease characterized by the aggregation of beta-amyloid plaques (Aβ) and accumulation of neurofibrillary tangles (NFTs) in the cortex. The spread of NFTs with advancing AD follows a hierarchical pattern starting in the entorhinal cortex (ERC) before progressing throughout the cerebral grey matter following the neuropathologically defined Braak stages. Accumulation of NFTs is associated with neuronal cell death and the cognitive decline typified by AD over the disease time course. Positron emission tomography (PET) imaging is highly sensitive tool that can be used to track the aggregation of Aβ plaques and accumulation of NFT tau in vivo, before the onset of AD-related cognitive symptoms in some imaging study participants. [F-18]MK6240 is a tau PET radioligand that binds to NFTs in AD with high affinity and can be used to evaluate the distribution of tau pathology in PET imaging participants across the AD continuum. Recent advances in AD interventional therapies targeting Aβ deposits and NFTs have incorporated tau PET alongside other imaging markers as outcomes of drug efficacy in slowing the progression of AD in clinical trial cohorts. As clinical trials and AD therapeutic agents further explore mechanisms for AD prevention in high risk, cognitively unimpaired populations, the ability of tau PET to identify and evaluate NFT burden at low levels before cognitive impairment is becoming increasingly important. In this dissertation work the progression of NFT pathology across the AD spectrum is characterized and the ability of tau PET to detect subtle changes in NFT burden in vivo is evaluated based on radioligand binding information from a combination of postmortem binding assays and PET imaging metrics. ERC tissue samples from seven human donors were identified covering the range of NFT pathology spread observed in AD and underwent postmortem tissue binding assays to evaluate the range of concentration and spatial distribution of MK6240 binding to NFTs in human tissue. An increase in MK6240 target binding density, measured using saturation binding assays, and spread of NFTs through the ERC cortical layers, measured using immunohistochemistry (IHC) and autoradiography (ARG), is observed in tissue samples with increasing postmortem pathology scores in the ERC. These high-resolution postmortem binding findings were correlated with population-based tau PET imaging measures using [F-18]MK6240 in a large PET imaging population. The temporal progression of tau PET signal is modeled with a logistic growth curve that covers the spectrum of NFT burden in AD that can be directly compared to the range of postmortem tissue binding outcomes. In characterizing the spread of [F-18]MK6240 binding with increases in NFT burden, a more sensitive standardized uptake value ratio (SUVR) positivity threshold was developed that incorporates off-target signal in the meninges surrounding target regions in the ERC and medial temporal lobe (MTL). Utilizing this threshold, tau positivity maps modeling the regions of elevated volumes of tau PET signal across the [F-18]MK6240 imaging population were generated to demonstrate the progression of tau PET signal throughout the ERC and temporal lobe. Simulations representing [F-18]MK6240 PET images incorporating derived postmortem binding metrics and tau PET outcomes were created to probe the limits of tau PET to identify localized increases of NFT burden in the ERC. Based on the radiotracer distributions observed in Aβ- [F-18]MK6240 PET scans this simulation framework was validated and then simulations with NFT burden increases corresponding to values identified in tissue binding assays were generated to represent realistic pathology and tracer binding in a PET imaging context. Based on these simulations NFT burden associated with moderate to advanced spread through the cortex (associated with a Braak III pathology score and beyond) could be reliably identified with [F-18]MK6240 imaging. This dissertation work characterizes increasing AD-related tau pathology in postmortem tissue samples and in vivo tau PET imaging capturing the range of NFT pathology and [F-18]MK6240 binding across the AD spectrum. The findings presented here demonstrate the utility of tau PET for evaluating subtle changes in NFT burden in early AD regions and introduces methods for improving detection sensitivity for use in research studies, clinical trials and beyond.
- 일반주제명
- Medical imaging
- 일반주제명
- Neurosciences
- 일반주제명
- Pathology
- 키워드
- Tau positivity
- 기타저자
- The University of Wisconsin - Madison Medical Physics
- 기본자료저록
- Dissertations Abstracts International. 87-05B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
008260126s2025 us c eng d■001000017360169
■00520260202105314
■006m o d
■007cr#unu||||||||
■020 ▼a9798265430472
■035 ▼a(MiAaPQ)AAI32285955
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a616
■1001 ▼aMcVea, Andrew.
■24510▼aQuantifying the Limits of Tau PET in Detecting Early Alzheimer's Disease
■260 ▼a[Sl]▼bThe University of Wisconsin - Madison▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a168 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-05, Section: B.
■500 ▼aAdvisor: Christian, Bradely T.
■5021 ▼aThesis (Ph.D.)--The University of Wisconsin - Madison, 2025.
■520 ▼aAlzheimer's disease (AD) is a neurodegenerative disease characterized by the aggregation of beta-amyloid plaques (Aβ) and accumulation of neurofibrillary tangles (NFTs) in the cortex. The spread of NFTs with advancing AD follows a hierarchical pattern starting in the entorhinal cortex (ERC) before progressing throughout the cerebral grey matter following the neuropathologically defined Braak stages. Accumulation of NFTs is associated with neuronal cell death and the cognitive decline typified by AD over the disease time course. Positron emission tomography (PET) imaging is highly sensitive tool that can be used to track the aggregation of Aβ plaques and accumulation of NFT tau in vivo, before the onset of AD-related cognitive symptoms in some imaging study participants. [F-18]MK6240 is a tau PET radioligand that binds to NFTs in AD with high affinity and can be used to evaluate the distribution of tau pathology in PET imaging participants across the AD continuum. Recent advances in AD interventional therapies targeting Aβ deposits and NFTs have incorporated tau PET alongside other imaging markers as outcomes of drug efficacy in slowing the progression of AD in clinical trial cohorts. As clinical trials and AD therapeutic agents further explore mechanisms for AD prevention in high risk, cognitively unimpaired populations, the ability of tau PET to identify and evaluate NFT burden at low levels before cognitive impairment is becoming increasingly important. In this dissertation work the progression of NFT pathology across the AD spectrum is characterized and the ability of tau PET to detect subtle changes in NFT burden in vivo is evaluated based on radioligand binding information from a combination of postmortem binding assays and PET imaging metrics. ERC tissue samples from seven human donors were identified covering the range of NFT pathology spread observed in AD and underwent postmortem tissue binding assays to evaluate the range of concentration and spatial distribution of MK6240 binding to NFTs in human tissue. An increase in MK6240 target binding density, measured using saturation binding assays, and spread of NFTs through the ERC cortical layers, measured using immunohistochemistry (IHC) and autoradiography (ARG), is observed in tissue samples with increasing postmortem pathology scores in the ERC. These high-resolution postmortem binding findings were correlated with population-based tau PET imaging measures using [F-18]MK6240 in a large PET imaging population. The temporal progression of tau PET signal is modeled with a logistic growth curve that covers the spectrum of NFT burden in AD that can be directly compared to the range of postmortem tissue binding outcomes. In characterizing the spread of [F-18]MK6240 binding with increases in NFT burden, a more sensitive standardized uptake value ratio (SUVR) positivity threshold was developed that incorporates off-target signal in the meninges surrounding target regions in the ERC and medial temporal lobe (MTL). Utilizing this threshold, tau positivity maps modeling the regions of elevated volumes of tau PET signal across the [F-18]MK6240 imaging population were generated to demonstrate the progression of tau PET signal throughout the ERC and temporal lobe. Simulations representing [F-18]MK6240 PET images incorporating derived postmortem binding metrics and tau PET outcomes were created to probe the limits of tau PET to identify localized increases of NFT burden in the ERC. Based on the radiotracer distributions observed in Aβ- [F-18]MK6240 PET scans this simulation framework was validated and then simulations with NFT burden increases corresponding to values identified in tissue binding assays were generated to represent realistic pathology and tracer binding in a PET imaging context. Based on these simulations NFT burden associated with moderate to advanced spread through the cortex (associated with a Braak III pathology score and beyond) could be reliably identified with [F-18]MK6240 imaging. This dissertation work characterizes increasing AD-related tau pathology in postmortem tissue samples and in vivo tau PET imaging capturing the range of NFT pathology and [F-18]MK6240 binding across the AD spectrum. The findings presented here demonstrate the utility of tau PET for evaluating subtle changes in NFT burden in early AD regions and introduces methods for improving detection sensitivity for use in research studies, clinical trials and beyond.
■590 ▼aSchool code: 0262.
■650 4▼aMedical imaging
■650 4▼aNeurosciences
■650 4▼aPathology
■653 ▼aAlzheimer's disease
■653 ▼aNeurodegeneration
■653 ▼aPostmortem binding assays
■653 ▼aTau positivity
■690 ▼a0574
■690 ▼a0317
■690 ▼a0571
■71020▼aThe University of Wisconsin - Madison▼bMedical Physics.
■7730 ▼tDissertations Abstracts International▼g87-05B.
■790 ▼a0262
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17360169▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


