Browsing by Author "Sanders, Elizabeth"

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    Amyloid PET predicts longitudinal functional and cognitive trajectories in a heterogeneous cohort
    (Wiley, 2025) Younes, Kyan; Johns, Emily; Young, Christina B.; Kennedy, Gabriel; Mukherjee, Shubhabrata; Vossler, Hillary A.; Winer, Joseph; Cody, Karly; Henderson, Victor W.; Poston, Kathleen L.; Betthauser, Tobey J.; Bevis, Bill; Brooks, William M.; Burns, Jeffrey M.; Coombes, Stephen A.; DeCarli, Charles; DiFilippo, Frank P.; Duara, Ranjan; Fan, Audrey P.; Gibbons, Laura E.; Golde, Todd; Johnson, Sterling C.; Lepping, Rebecca J.; Leverenz, James; McDougall, Sean; Rogalski, Emily; Sanders, Elizabeth; Pasaye, Joshua; Sridhar, Jaiashre; Saykin, Andrew J.; Sridharan, Anjali; Swerdlow, Russell; Trittschuh, Emily H.; Vaillancourt, David; Vidoni, Eric; Wang, Wei-En; Mez, Jesse; Hohman, Timothy J.; Tosun, Duygu; Biber, Sarah; Kukull, Walter A.; Crane, Paul K.; Mormino, Elizabeth C.; Radiology and Imaging Sciences, School of Medicine
    Introduction: Amyloid positron emission tomography (PET) is increasingly available for diagnosis of Alzheimer`s disease (AD); however, its practical implications in heterogenous cohorts are debated. Methods: Amyloid PET from 890 National Alzheimer`s Coordinating Center participants with up to 10 years post-PET follow up was analyzed. Cox proportional hazards and linear mixed models were used to investigate amyloid burden prediction of etiology and prospective functional status and cognitive decline. Results: Amyloid positivity was associated with progression from unimpaired to mild cognitive impairment and dementia. Amyloid burden in the unimpaired group was associated with lower initial memory levels and faster decline in memory, language, and global cognition. In the Impaired group, amyloid was associated with lower initial levels and faster decline for memory, language, executive function, and global cognition. Discussion: Amyloid burden is an important prognostic marker in a clinically heterogeneous cohort. Future work is needed to establish the proportion of decline driven by AD versus non-AD processes in the context of mixed pathology. Highlights: Our findings highlight the importance of amyloid positron emission tomography (PET) in heterogenous cohorts, including diverse demographics, clinical syndromes, and underlying etiologies. The results also provide evidence that higher amyloid levels were linked to functional progression from unimpaired cognition to mild cognitive impairment (MCI) and from MCI to dementia. In cognitively unimpaired individuals, higher amyloid burden was associated with poorer memory at baseline and subsequent declines in memory, language, and global cognition. Among individuals with cognitive impairment, amyloid burden was associated with worse initial memory, language, executive function, and global cognition, and faster declines over time.
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    Incidence of cognitively defined late-onset Alzheimer's dementia subgroups from a prospective cohort study
    (Elsevier, 2017-12) Crane, Paul K.; Trittschuh, Emily; Mukherjee, Shubhabrata; Saykin, Andrew J.; Sanders, Elizabeth; Larson, Eric B.; McCurry, Susan M.; McCormick, Wayne; Bowen, James D.; Grabowski, Thomas; Moore, Mackenzie; Gross, Alden L.; Keene, Dirk; Bird, Thomas E.; Gibbons, Laura E.; Mez, Jesse; Radiology and Imaging Sciences, School of Medicine
    INTRODUCTION: There may be biologically relevant heterogeneity within typical late-onset Alzheimer's dementia. METHODS: We analyzed cognitive data from people with incident late-onset Alzheimer's dementia from a prospective cohort study. We determined individual averages across memory, visuospatial functioning, language, and executive functioning. We identified domains with substantial impairments relative to that average. We compared demographic, neuropathology, and genetic findings across groups defined by relative impairments. RESULTS: During 32,286 person-years of follow-up, 869 people developed Alzheimer's dementia. There were 393 (48%) with no domain with substantial relative impairments. Some participants had isolated relative impairments in memory (148, 18%), visuospatial functioning (117, 14%), language (71, 9%), and executive functioning (66, 8%). The group with isolated relative memory impairments had higher proportions with ≥ APOE ε4 allele, more extensive Alzheimer's-related neuropathology, and higher proportions with other Alzheimer's dementia genetic risk variants. DISCUSSION: A cognitive subgrouping strategy may identify biologically distinct subsets of people with Alzheimer's dementia.
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    The Integrating Community Engaged Learning through Ethical Reflection (ICELER) Faculty Learning Community Theory of Change and Learning Goals, Years 1-4
    (Stem Education Innovation & Research Institute and the IUPUI Center for Service and Learning, 2022-09-04) Price, Mary F.; Coleman, Martin A.; Fore, Grant A.; Sorge, Brandon H.; Hahn, Tom; Sanders, Elizabeth; Nyarko, Samuel Cornelius; Hatcher, Julie A.
    This document presents the final ICELER theory of change, including annually generated FLC goals that were part of a multi-year institutional transformation grant #1737157 entitled Institutional Transformation: Enhancing IUPUI STEM Curriculum through the Community-Engaged Learning and Ethical Reflection Framework (I-CELER)
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    Patterns of Tau Deposition by Cognitive Subtype in the Alzheimer's Disease Neuroimaging Initiative
    (Wiley, 2025-01-09) Scollard, Phoebe; Gibbons, Laura E.; Choi, Seo-Eun; Lee, Michael L.; Klinedinst, Brandon S.; Trittschuh, Emily H.; Mez, Jesse; Saykin, Andrew J.; Nakano, Connie; Sanders, Elizabeth; Lila, Eardi; Risacher, Shannon L.; Mormino, Elizabeth; Smith, Viktorija; Carlson, Mackenzie L.; Young, Christina B.; Crane, Paul K.; Mukherjee, Shubhabrata; Radiology and Imaging Sciences, School of Medicine
    Background: Cognitive subtypes of Alzheimer’s Dementia (AD), defined by a relative impairment in a particular domain of cognition, have previously been shown to be associated with patterns of gray matter atrophy. Here we assessed the association of these subtypes with patterns of tau deposition measured in vivo using tau PET imaging in the Alzheimer’s Disease Neuroimaging Initiative (ADNI). Method: We included amyloid positive individuals with AD and Mild Cognitive Impairment (MCI). We selected the first diagnosis visit for AD and the most recent visit for MCI. Previously, AD individuals were categorized into AD‐Memory, AD‐Language, AD‐Executive, AD‐Visuospatial, AD‐Multiple domains, or AD‐No domain subtypes based on a relative cognitive impairment. These methods were extended to categorize MCI individuals. The AD/MCI‐Memory, AD/MCI‐Visuospatial, and AD/MCI‐No domain groups were large enough for our analyses. The tau PET scan closest to the subtyping visit was selected (median 49 days between scan and visit). Tau deposition for 35 brain regions (left and right sides averaged) were included as predictors. Separate five‐fold cross validated LASSO regressions were run for each of the three pairwise comparisons. Each model was repeated 100 times with different random fold selections to assess the stability of results. Result: We included 240 individuals (118 AD; 122 MCI) in our analyses (Table 1). There was some variation in the chosen models across repetitions with the AD/MCI‐Visuospatial versus AD/MCI‐No domain comparison varying the most (Table 2). We limit interpretation to those regions that appeared in ≥70% of repetitions. The amygdala was consistently selected in all pair‐wise comparisons. Higher tau deposition in this region was associated with a higher likelihood of being in AD/MCI‐Memory. Higher tau deposition in the postcentral region was associated with a lower likelihood of being in AD/MCI‐Memory compared to AD/MCI‐Visuospatial. Coefficients on consistently selected regions in the AD/MCI‐visuospatial versus AD/MCI‐No domain comparison were small. Figure 1 summarizes the top results from our analyses. Conclusion: We found heterogeneity in regional tau deposition among three cognitive subtypes. Future work will make use of additional cohorts with harmonized cognitive and imaging data. We plan to incorporate all cognitive subtypes and evaluate lateral asymmetry.
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    The Integrated Community-Engaged Learning and Ethical Reflection (ICELER) Faculty Learning Community Curriculum: 2018-2022
    (2023-12-18) Price, Mary F.; Coleman, Martin A.; Fore, Grant A.; Hess, Justin L.; Sorge, Brandon H.; Hahn, Tom; Sanders, Elizabeth; Nyarko, Samuel Cornelius
    The Integrated Community-Engaged Learning and Ethical Reflection (ICELER) project was funded under the NSF’s Cultivating Cultures for Ethical STEM program (Award #1737157) in 2017 as a five-year institutional transformation grant (see Fore et al., 2018). The ICELER project approaches institutional transformation in teaching and learning on multiple levels including individual and departmental. To effect changes at these two levels, the research team used a faculty learning community (FLC) as a core intervention in the project. This document provides background information on the curriculum used in this FLC, including descriptions of the design features and activities. This report includes an appendices section as well that includes sample assignments and tools used over the four years that the FLC was active. This report is intended as a resource for those interested in learning from, replicating, or adapting it for their own work with faculty.