Drivers of Astrocytic Tau Pathology in 4R Tauopathies- [electronic resource]
Drivers of Astrocytic Tau Pathology in 4R Tauopathies- [electronic resource]
- Material Type
- 단행본
- 0016931680
- Date and Time of Latest Transaction
- 20240214100102
- ISBN
- 9798379785451
- DDC
- 616
- Author
- Fiock, Kimberly Lynn.
- Title/Author
- Drivers of Astrocytic Tau Pathology in 4R Tauopathies - [electronic resource]
- Publish Info
- [S.l.]: : The University of Iowa., 2023
- Publish Info
- Ann Arbor : : ProQuest Dissertations & Theses,, 2023
- Material Info
- 1 online resource(152 p.)
- General Note
- Source: Dissertations Abstracts International, Volume: 85-01, Section: B.
- General Note
- Advisor: Hefti, Marco.
- 학위논문주기
- Thesis (Ph.D.)--The University of Iowa, 2023.
- Restrictions on Access Note
- This item must not be sold to any third party vendors.
- Abstracts/Etc
- 요약Toxicity caused by abnormal accumulations of tau protein is the final step in the pathway of many neurodegenerative diseases, including Alzheimer's disease (AD), frontotemporal lobar degeneration (FTLD-tau), chronic traumatic encephalopathy (CTE), and other tauopathies. Though this process has been extensively studied in neurons in the context of AD, the mechanisms that drive this same process in astrocytes, and how that in turn drives diseases like FTLD-tau, remain poorly understood.Using a combination of human tissue and human embryonic stem cell-derived (hESC) astrocytes, we sought to uncover the origin of astrocytic tau in FTLD-tau and the potential candidate mediators of tau accumulation in astrocytes in vitro. We used RNA in situ hybridization and immunofluorescence on cases of AD, PSP, and CBD to compare total amounts of tau mRNA between diseases and between astrocytes with and without tau pathology in PSP. We then used hESC-derived astrocytes to assess their ability to take up and degrade different isoforms of tau.We saw no significant differences in astrocytic tau mRNA expression between diseases with and without astrocytic tau pathology or between individual astrocytes with and without pathology in our PSP cohort. We also found that both control and reactive astrocytes in vitro preferentially take up 4R tau, but only reactive astrocytes exhibit significantly impaired uptake and degradation. Across diseases, astrocytes with tau pathology do not show elevated markers associated with the neurotoxic A1 reactive astrocyte phenotype.Taken together, this data suggests that neuronal and astrocytic tau in FTLD-tau shares a common neuronal origin, and that the preferential uptake and subsequent impaired degradation of 4R tau may explain why 4R accumulation is more common in astrocytes. These results also suggest that tau uptake by astrocytes may have a protective function. Future work focused on characterization of the neuroprotective A2 reactive astrocyte phenotype, in addition to an in-depth exploration of the candidate mediators of tau uptake and degradation, is necessary to further understand the role of astrocytes in FTLD-tau.
- Subject Added Entry-Topical Term
- Pathology.
- Subject Added Entry-Topical Term
- Neurosciences.
- Subject Added Entry-Topical Term
- Biochemistry.
- Index Term-Uncontrolled
- FTLD-tau
- Index Term-Uncontrolled
- Reactive astrocytes
- Index Term-Uncontrolled
- Stem cells
- Index Term-Uncontrolled
- Tau
- Index Term-Uncontrolled
- Alzheimer's disease
- Index Term-Uncontrolled
- Neuroprotective
- Added Entry-Corporate Name
- The University of Iowa Pathology
- Host Item Entry
- Dissertations Abstracts International. 85-01B.
- Host Item Entry
- Dissertation Abstract International
- Electronic Location and Access
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- 소장사항
-
202402 2024
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