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News from the WHI Study

Particulate matter exposure associated with neuroanatomical risk of Alzheimer’s Disease

Featured Publication

December 8, 2020

Diana Younan photo
Diana Younan, Ph.D., M.P.H.

A new study led by Dr. Diana Younan at the University of Southern California used data from the WHI Memory Study of Magnetic Resonance Imaging (WHIMS-MRI) to investigate whether fine particulate matter contributes to brain changes predictive of Alzheimer’s Disease. A total of 712 WHI women who had two MRI scans, one in 2005-6 and the other in 2010-11, were longitudinally analyzed. The scans were assigned a score based on patterns of grey matter atrophy that is used as an early biomarker for Alzheimer’s Disease. Air pollution was measured in the form of particulate matter (<2.5 micrometer) exposure and identified using the participant’s home addresses and spatiotemporal modeling that includes data from the US EPA Air Quality System. Dr. Younan and her team found that long term exposure to particulate matter was associated with neuroanatomical changes that increase risk for Alzheimer’s Disease by 24% over five years, even after accounting for demographic, health behaviors, and possible cerebrovascular damage. Their study provides support that particulate matter is associated with neurodegeneration.

These findings were published in the November 18th, 2020 edition of Neurology.