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Holmes R, Duan H, Bagley O, Wu D, Loika Y, Kulminski A, Yashin A, Arbeev K, Ukraintseva S. How are APOE4, changes in body weight, and longevity related? Insights from a causal mediation analysis. Front Aging 2024; 5:1359202. [PMID: 38496317 PMCID: PMC10941013 DOI: 10.3389/fragi.2024.1359202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/21/2023] [Accepted: 02/07/2024] [Indexed: 03/19/2024]
Abstract
The ε4 allele of the APOE gene (APOE4) is known for its negative association with human longevity; however, the mechanism is unclear. APOE4 is also linked to changes in body weight, and the latter changes were associated with survival in some studies. Here, we explore the role of aging changes in weight in the connection between APOE4 and longevity using the causal mediation analysis (CMA) approach to uncover the mechanisms of genetic associations. Using the Health and Retirement Study (HRS) data, we tested a hypothesis of whether the association of APOE4 with reduced survival to age 85+ is mediated by key characteristics of age trajectories of weight, such as the age at reaching peak values and the slope of the decline in weight afterward. Mediation effects were evaluated by the total effect (TE), natural indirect effect, and percentage mediated. The controlled direct effect and natural direct effect are also reported. The CMA results suggest that APOE4 carriers have 19%-22% (TE p = 0.020-0.039) lower chances of surviving to age 85 and beyond, in part, because they reach peak values of weight at younger ages, and their weight declines faster afterward compared to non-carriers. This finding is in line with the idea that the detrimental effect of APOE4 on longevity is, in part, related to the accelerated physical aging of ε4 carriers.
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Affiliation(s)
| | | | | | | | | | | | | | | | - Svetlana Ukraintseva
- Biodemography of Aging Research Unit, Social Science Research Institute, Duke University, Durham, NC, United States
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Buller-Peralta I, Gregory S, Low A, Dounavi ME, Bridgeman K, Ntailianis G, Lawlor B, Naci L, Koychev I, Malhotra P, O'Brien JT, Ritchie CW, Muniz-Terrera G. Comprehensive allostatic load risk index is associated with increased frontal and left parietal white matter hyperintensities in mid-life cognitively healthy adults. Sci Rep 2024; 14:573. [PMID: 38177228 PMCID: PMC10766612 DOI: 10.1038/s41598-023-49656-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Accepted: 12/11/2023] [Indexed: 01/06/2024] Open
Abstract
To date, there is a considerable heterogeneity of methods to score Allostatic Load (AL). Here we propose a comprehensive algorithm (ALCS) that integrates commonly used approaches to generate AL risk categories and assess associations to brain structure deterioration. In a cohort of cognitively normal mid-life adults (n = 620, age 51.3 ± 5.48 years), we developed a comprehensive composite for AL scoring incorporating gender and age differences, high quartile approach, clinical reference values, and current medications, to then generate AL risk categories. Compared to the empirical approach (ALES), ALCS showed better model fit criteria and a strong association with age and sex. ALSC categories were regressed against brain and white matter hyperintensity (WMH) volumes. Higher AL risk categories were associated with increased total, periventricular, frontal, and left parietal WMH volumes, also showing better fit compared to ALES. When cardiovascular biomarkers were removed from the ALSC algorithm, only left-frontal WMHV remained associated with AL, revealing a strong vascular burden influencing the index. Our results agree with previous evidence and suggest that sustained stress exposure enhances brain deterioration in mid-life adults. Showing better fit than ALES, our comprehensive algorithm can provide a more accurate AL estimation to explore how stress exposure enhances age-related health decline.
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Affiliation(s)
- Ingrid Buller-Peralta
- Edinburgh Dementia Prevention, Centre for Clinical Brain Sciences, Outpatients Department Level 2 Western General Hospital, The University of Edinburgh, Crewe Rd S, Edinburgh, EH4 2XU, UK.
| | - Sarah Gregory
- Edinburgh Dementia Prevention, Centre for Clinical Brain Sciences, Outpatients Department Level 2 Western General Hospital, The University of Edinburgh, Crewe Rd S, Edinburgh, EH4 2XU, UK
| | - Audrey Low
- Department of Psychiatry, School of Clinical Medicine, Addenbrooke's Hospital, University of Cambridge, Level E4, Box 189, Cambridge, CB2 0QQ, UK
| | - Maria-Eleni Dounavi
- Department of Psychiatry, School of Clinical Medicine, Addenbrooke's Hospital, University of Cambridge, Level E4, Box 189, Cambridge, CB2 0QQ, UK
| | - Katie Bridgeman
- Edinburgh Dementia Prevention, Centre for Clinical Brain Sciences, Outpatients Department Level 2 Western General Hospital, The University of Edinburgh, Crewe Rd S, Edinburgh, EH4 2XU, UK
| | - Georgios Ntailianis
- Edinburgh Dementia Prevention, Centre for Clinical Brain Sciences, Outpatients Department Level 2 Western General Hospital, The University of Edinburgh, Crewe Rd S, Edinburgh, EH4 2XU, UK
| | - Brian Lawlor
- Trinity College Institute of Neuroscience, School of Psychology, Aras an Phiarsaigh, Trinity College Dublin, Dublin 2, Ireland
- Global Brain Health Institute, Trinity College Dublin, GBHI Office Room 0.60, Lloyd Building Trinity College Dublin, Dublin 2, Ireland
| | - Lorina Naci
- Trinity College Institute of Neuroscience, School of Psychology, Aras an Phiarsaigh, Trinity College Dublin, Dublin 2, Ireland
- Global Brain Health Institute, Trinity College Dublin, GBHI Office Room 0.60, Lloyd Building Trinity College Dublin, Dublin 2, Ireland
| | - Ivan Koychev
- Department of Psychiatry, Warneford Hospital, Oxford University, Warneford Ln, Headington, Oxford, OX3 7JX, UK
| | - Paresh Malhotra
- Department of Brain Sciences, Imperial College London, Burlington Danes, The Hammersmith Hospital, Du Cane Road, London, W12 0NN, UK
| | - John T O'Brien
- Department of Psychiatry, School of Clinical Medicine, Addenbrooke's Hospital, University of Cambridge, Level E4, Box 189, Cambridge, CB2 0QQ, UK
| | - Craig W Ritchie
- Edinburgh Dementia Prevention, Centre for Clinical Brain Sciences, Outpatients Department Level 2 Western General Hospital, The University of Edinburgh, Crewe Rd S, Edinburgh, EH4 2XU, UK
- Scottish Brain Sciences, Gyleview House, 3 Redheughs Rigg, South Gyle, Edinburgh, EH12 9DQ, UK
| | - Graciela Muniz-Terrera
- Edinburgh Dementia Prevention, Centre for Clinical Brain Sciences, Outpatients Department Level 2 Western General Hospital, The University of Edinburgh, Crewe Rd S, Edinburgh, EH4 2XU, UK
- Ohio University Heritage College of Osteopathic Medicine, 191 W Union St, Athens, OH, 45701, USA
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Akushevich I, Yashkin A, Ukraintseva S, Yashin AI, Kravchenko J. The Construction of a Multidomain Risk Model of Alzheimer's Disease and Related Dementias. J Alzheimers Dis 2023; 96:535-550. [PMID: 37840484 PMCID: PMC10657690 DOI: 10.3233/jad-221292] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/28/2023] [Indexed: 10/17/2023]
Abstract
BACKGROUND Alzheimer's disease (AD) and related dementia (ADRD) risk is affected by multiple dependent risk factors; however, there is no consensus about their relative impact in the development of these disorders. OBJECTIVE To rank the effects of potentially dependent risk factors and identify an optimal parsimonious set of measures for predicting AD/ADRD risk from a larger pool of potentially correlated predictors. METHODS We used diagnosis record, survey, and genetic data from the Health and Retirement Study to assess the relative predictive strength of AD/ADRD risk factors spanning several domains: comorbidities, demographics/socioeconomics, health-related behavior, genetics, and environmental exposure. A modified stepwise-AIC-best-subset blanket algorithm was then used to select an optimal set of predictors. RESULTS The final predictive model was reduced to 10 features for AD and 19 for ADRD; concordance statistics were about 0.85 for one-year and 0.70 for ten-year follow-up. Depression, arterial hypertension, traumatic brain injury, cerebrovascular diseases, and the APOE4 proxy SNP rs769449 had the strongest individual associations with AD/ADRD risk. AD/ADRD risk-related co-morbidities provide predictive power on par with key genetic vulnerabilities. CONCLUSION Results confirm the consensus that circulatory diseases are the main comorbidities associated with AD/ADRD risk and show that clinical diagnosis records outperform comparable self-reported measures in predicting AD/ADRD risk. Model construction algorithms combined with modern data allows researchers to conserve power (especially in the study of disparities where disadvantaged groups are often grossly underrepresented) while accounting for a high proportion of AD/ADRD-risk-related population heterogeneity stemming from multiple domains.
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Affiliation(s)
- Igor Akushevich
- Biodemography of Aging Research Unit, Social Science Research Institute, Duke University, Durham, NC, USA
| | - Arseniy Yashkin
- Biodemography of Aging Research Unit, Social Science Research Institute, Duke University, Durham, NC, USA
| | - Svetlana Ukraintseva
- Biodemography of Aging Research Unit, Social Science Research Institute, Duke University, Durham, NC, USA
| | - Anatoliy I. Yashin
- Biodemography of Aging Research Unit, Social Science Research Institute, Duke University, Durham, NC, USA
| | - Julia Kravchenko
- Department of Surgery, Duke University Medical Center, Durham, NC, USA
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