This is the first resubmission of renewal application to address new fundamental questions regarding the complex web of causes of cognitive decline. The Baltimore Memory Study is a multilevel longitudinal cohort study of the causes of cognitive decline in persons aged 50 to 70 years at enrollment. During Phase I we enrolled 1,140 subjects with diversity by sex, race/ethnicity, and SES and followed 943 (82.7%) of them to the third study visit an average (SD) of 2.5 (0.2) years later. Study subjects completed an extensive cognitive test battery at each of three study visits, and completed other health assessments and an extensive interview. We have a very broad set of measures of risk factors and potential causes, including lead in blood, patella, and tibia, blood mercury, serum PCBs, serum lipids and homocysteine, salivary cortisols across the study visit, detailed SES assessment, health-related habits (i.e., tobacco, alcohol, diet, physical activity), social networks, social support, and 10 genetic polymorphisms in 8 genes relevant to neurotoxicants, brain function, or stress. Finally, we developed a rigorous metric for assessment of the social environment in neighborhoods, termed the Neighborhood Psychosocial Hazards (NPH) scale, to evaluate how the neighborhood conditions can interact with other causes to impact cognitive function. In the first five years we have made a number of novel observations. These include that cumulative lead dose was associated with decrements in cognitive function and with amnestic mild cognitive impairment;NPH was associated with decrements in cognitive function;cortisol metrics that summarized four salivary cortisol measures across the study visit were associated with decrements in cognitive function (and this effect was worse among those with the APOE-e4 allele);NPH was associated with the cortisol metrics;and NPH modified relations of tibia lead with cognitive test scores. We now want to follow 800 subjects into Phase II, for two additional study visits over 32 months and new measures of vascular health (CRP, sICAM-1) and the HPA axis (six salivary cortisol measures). This will allow us to determine if the Phase I effects are persistent or progressive, and to examine relations among cognitive function, neurotoxicant exposures, the social environment, the HPA axis and """"""""stress,"""""""" vascular health, and aging, knowledge that will contribute to understanding etiology and mechanism and thus lead to public health and clinical interventions in the future.

Agency
National Institute of Health (NIH)
Institute
National Institute on Aging (NIA)
Type
Research Project (R01)
Project #
5R01AG019604-08
Application #
7799753
Study Section
Neurological, Aging and Musculoskeletal Epidemiology (NAME)
Program Officer
King, Jonathan W
Project Start
2000-09-30
Project End
2012-04-30
Budget Start
2010-05-01
Budget End
2011-04-30
Support Year
8
Fiscal Year
2010
Total Cost
$575,248
Indirect Cost
Name
Johns Hopkins University
Department
Public Health & Prev Medicine
Type
Schools of Public Health
DUNS #
001910777
City
Baltimore
State
MD
Country
United States
Zip Code
21218
Samuel, Laura J; Roth, David L; Schwartz, Brian S et al. (2016) Socioeconomic Status, Race/Ethnicity, and Diurnal Cortisol Trajectories in Middle-Aged and Older Adults. J Gerontol B Psychol Sci Soc Sci :
Rudolph, Kara E; Glass, Thomas A; Crum, Rosa M et al. (2013) Neighborhood psychosocial hazards and binge drinking among late middle-aged adults. J Urban Health 90:970-82
Lee, Brian K; Glass, Thomas A; James, Bryan D et al. (2011) Neighborhood psychosocial environment, apolipoprotein E genotype, and cognitive function in older adults. Arch Gen Psychiatry 68:314-21
Bandeen-Roche, Karen; Glass, Thomas A; Bolla, Karen I et al. (2009) Cumulative lead dose and cognitive function in older adults. Epidemiology 20:831-9
Cagney, Kathleen A; Glass, Thomas A; Skarupski, Kimberly A et al. (2009) Neighborhood-level cohesion and disorder: measurement and validation in two older adult urban populations. J Gerontol B Psychol Sci Soc Sci 64:415-24
Glass, Thomas A; Bandeen-Roche, Karen; McAtee, Matthew et al. (2009) Neighborhood psychosocial hazards and the association of cumulative lead dose with cognitive function in older adults. Am J Epidemiol 169:683-92
Theppeang, Keson; Glass, Thomas A; Bandeen-Roche, Karen et al. (2008) Associations of bone mineral density and lead levels in blood, tibia, and patella in urban-dwelling women. Environ Health Perspect 116:784-90
Augustin, Toms; Glass, Thomas A; James, Bryan D et al. (2008) Neighborhood psychosocial hazards and cardiovascular disease: the Baltimore Memory Study. Am J Public Health 98:1664-70
Lee, Brian K; Glass, Thomas A; Wand, Gary S et al. (2008) Apolipoprotein e genotype, cortisol, and cognitive function in community-dwelling older adults. Am J Psychiatry 165:1456-64
Schwartz, Brian S; Stewart, Walter F (2007) Lead and cognitive function in adults: a questions and answers approach to a review of the evidence for cause, treatment, and prevention. Int Rev Psychiatry 19:671-92

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