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Full-Text Articles in Physiology
Divergence In Neuronal Calcium Dysregulation In Brain Aging And Animal Models Of Ad, Adam Ghoweri
Divergence In Neuronal Calcium Dysregulation In Brain Aging And Animal Models Of Ad, Adam Ghoweri
Theses and Dissertations--Pharmacology and Nutritional Sciences
Neuronal calcium dysregulation first garnered attention during the mid-1980’s as a key factor in brain aging, which led to the formulation of the Ca2+ hypothesis of brain aging and dementia. Indeed, many Ca2+-dependent cellular processes that change with age, including an increase in the afterhyperpolarization, a decrease in long-term potentiation, an increased susceptibility to long-term depression, and a reduction in short-term synaptic plasticity, have been identified. It was later determined that increased intracellular Ca2+ with age was due to increased Ca2+ channel density, elevated release from intracellular Ca2+ stores, and decreased Ca2+ buffering …
Pharmaceutical And Natural (Exercise) Mechanisms To Mitigate The Negative Impact Of Ptsd And Chronic Stress On Synaptic Plasticity And Memory, Roxanne M. Miller
Pharmaceutical And Natural (Exercise) Mechanisms To Mitigate The Negative Impact Of Ptsd And Chronic Stress On Synaptic Plasticity And Memory, Roxanne M. Miller
Theses and Dissertations
Synapses can be altered due to experiences in a process called synaptic plasticity, which causes memory formations. Synapses can be strengthened through methods known as long-term potentiation (LTP) or weakened through long-term depression (LTD). Stresses can cause changes by altering synapses through either LTP or LTD. Rats were used to study the effects of post-traumatic stress disorder (PTSD)-like symptoms and a prophylactic treatment using pharmaceuticals. The first model used was the single prolonged stress (SPS) with two weeks of chronic light, which was not as effective for causing changes in synaptic plasticity. The second model, seven days of social defeat …
Pharmaceutical And Natural (Exercise) Mechanisms To Mitigate The Negative Impact Of Ptsd And Chronic Stress On Synaptic Plasticity And Memory, Roxanne M. Miller
Pharmaceutical And Natural (Exercise) Mechanisms To Mitigate The Negative Impact Of Ptsd And Chronic Stress On Synaptic Plasticity And Memory, Roxanne M. Miller
Theses and Dissertations
Synapses can be altered due to experiences in a process called synaptic plasticity, which causes memory formations. Synapses can be strengthened through methods known as long-term potentiation (LTP) or weakened through long-term depression (LTD). Stresses can cause changes by altering synapses through either LTP or LTD. Rats were used to study the effects of post-traumatic stress disorder (PTSD)-like symptoms and a prophylactic treatment using pharmaceuticals. The first model used was the single prolonged stress (SPS) with two weeks of chronic light, which was not as effective for causing changes in synaptic plasticity. The second model, seven days of social defeat …
Quantification Of Brain-Region Specific Alterations In Insulin-Like Growth Factor-1 Expression During Developmental Hypothyroidism, Cari Lee Graber-Feesl
Quantification Of Brain-Region Specific Alterations In Insulin-Like Growth Factor-1 Expression During Developmental Hypothyroidism, Cari Lee Graber-Feesl
All Graduate Theses, Dissertations, and Other Capstone Projects
Insufficient thyroid hormone (TH) during development results in permanent neurological deficits. These deficits are the result of perturbed TH-mediated brain development. Interestingly, insufficient insulin-like growth factor 1 (Igf-1) during development results in neurological deficits that are similar to those reported for developmental hypothyroidism. This observation suggests that deficits associated with low TH during development may be the result of altered Igf-1 expression in the developing brain. To test this, timed-pregnant mice were treated with thyroid gland inhibitors from gestational day 16 (GD16) until postnatal day 21 (P21) to induce a hypothyroid state. A parallel set of untreated timed-pregnant mice were …
A Semi-Automated Algorithm For Segmenting The Hippocampus In Patient And Control Populations, Nathan Mckay Muncy
A Semi-Automated Algorithm For Segmenting The Hippocampus In Patient And Control Populations, Nathan Mckay Muncy
Theses and Dissertations
Calculating hippocampal volume from Magnetic Resonance (MR) images is an essential task in many studies of neurocognition in healthy and diseased populations. The `gold standard' method involves hand tracing, which is accurate but laborious, requiring expertly trained researchers and significant amounts of time. As such, segmenting large datasets with the standard method is impractical. Current automated pipelines are inaccurate at hippocampal demarcation and volumetry. We developed a semi-automated hippocampal segmentation pipeline based on the Advanced Normalization Tools (ANTs) suite of programs to segment the hippocampus. We applied the semi-automated segmentation pipeline to 70 participant scans (26 female) from groups that …
An Evaluation Of The Influences Of Extra-Hippocampal Processes On Pattern Separation, Malia L. Anderson
An Evaluation Of The Influences Of Extra-Hippocampal Processes On Pattern Separation, Malia L. Anderson
Theses and Dissertations
Long-term declarative memory depends on pattern separation, which reduces the degree of overlap between similar representations, to maintain memory specificity, and on pattern completion, which occurs when a degraded cue is used to retrieve a previously stored memory. Previous studies aimed at evaluating the underlying neuronal substrates of these computational processes have used a mnemonic discrimination paradigm and fMRI to focus on the hippocampus, to the exclusion of cortical processing. We aim to investigate the influences extra-hippocampal processes have on pattern separation in the following two studies. Study 1. Computational models of pattern completion suggest it occurs cortically and results …
A Neuroimaging Investigation Of The Effects Of Age And Sleep On Pattern Separation, Christopher Robert Doxey
A Neuroimaging Investigation Of The Effects Of Age And Sleep On Pattern Separation, Christopher Robert Doxey
Theses and Dissertations
Effective memory representations must be specific to prevent interference between episodes that may overlap in terms of place, time, or items present. Pattern separation, a computational process performed by the hippocampus overcomes this interference by establishing non-overlapping memory representations. This project explores pattern separation and how it is impacted by age and sleep. Experiment 1. Structures of the medial temporal lobe (MTL) are known to be involved in declarative memory processes. However, little is known about how age-related changes in MTL structures, white matter integrity, and functional connectivity affect pattern separation processes in the MTL. In the present study, we …
Regulation Of Micrornas By 17Β-Estradiol In The Aging Female Brain, Yathindar Satya Giffin-Rao
Regulation Of Micrornas By 17Β-Estradiol In The Aging Female Brain, Yathindar Satya Giffin-Rao
Dissertations
Hormone Therapy (HT) is used to increase the 17β-estradiol (E2) levels in women who are going through the menopausal transition to alleviate the negative symptoms associated with menopause and decrease the risk of chronic diseases. Clinical and basic science research had previously shown that HT provided protection from cognitive decline and reduced the risk of dementia. However the Women's Health Initiative (WHI) clinical trial demonstrated that HT had no beneficial effects for cognitive decline and, in some cases increased the risk of dementia in post-menopausal women. However, further analysis of WHI data showed that when HT was given to women …
Expression And Function Of Alpha3 And Beta2 Neuronal Nicotinic Acetylcholine Receptor Subunits In Hek-293 Cells, Nathan W. Steinhafel
Expression And Function Of Alpha3 And Beta2 Neuronal Nicotinic Acetylcholine Receptor Subunits In Hek-293 Cells, Nathan W. Steinhafel
Theses and Dissertations
Single-cell real-time quantitative RT-PCR was used to characterize the mRNA expression of rat neuronal nicotinic acetylcholine receptor (nAChR) subunits α3 and β2 in CA1 hippocampus stratum radiatum and stratum oriens interneurons. α3β2 co-expression was detected in 43% of interneurons analyzed. The nAChR subtype α3β2 was transiently expressed in cells derived from the human embryonic kidney cell line 293 at mRNA levels found in the CA1. The functional properties of α3β2 in HEK-293 cells were characterized by whole-cell patch clamping using acetylcholine (ACh) as an agonist. The kinetics of α3β2 channels were further analyzed by altering the level of α3 DNA …