Menopause Linked to Accelerated Brain Aging and Alzheimer’s Risk: New Study

Tracking Protein Changes Across Menopause Stages

The study initially analyzed 80 women aged 43 to 58, which included 30 premenopausal women, 26 perimenopausal women transitioning through the perimenopausal phase, and 24 postmenopausal women. Investigators tested their serum for 118 central nervous system-related proteins. After controlling for age, postmenopausal women showed significantly higher levels of 16 specific proteins compared to premenopausal participants. These proteins involve immune and inflammatory responses, neuronal and synaptic function, metabolism, and biological processes linked to Alzheimer’s disease. When researchers synthesized these markers into a menopausal protein score, the score increased progressively from premenopause through perimenopause to postmenopause. To determine whether age alone drove the shift, researchers evaluated the data and found that the association between age and the protein score was no longer significant once the menopausal stage was accounted for. The protein fluctuations correlated more closely with the specific stage of transition than with chronological aging.

Hormonal Shifts and Follicle-Stimulating Hormone

Further analysis connected the protein scores directly to hormonal adjustments. After adjusting for age, the menopausal protein score correlated with declining estradiol and rising follicle-stimulating hormone, known as FSH, while progesterone showed no significant link. FSH typically rises as women approach and enter the menopausal transition. When researchers evaluated estradiol, FSH, progesterone, and age together, only FSH remained significantly associated with the protein score. This indicates that the observed protein changes in the blood closely tie to the hormonal transitions of the period, particularly shifts in FSH.

Validation Across Large-Scale Biobank Data

To confirm these findings, the research team examined data from 2,814 women aged 45 to 60 using the UK Biobank. Testing 2,923 plasma proteins, they identified 1,300 proteins that varied across menopausal stages, with 1,146 increasing in postmenopausal women and 154 decreasing. Many proteins identified in the initial smaller group appeared again in this larger sample. Further evaluation showed heightened activity in inflammation and catabolic processes among postmenopausal participants. Using blood proteins to estimate the physiological age of various organs and cells, investigators found that postmenopausal women exhibited wider patterns of accelerated aging across organs and cells, including the brain. However, the study identifies an association between these protein signatures and menopause rather than proving a direct causal link where menopause causes accelerated brain aging.

Cognitive Health and Symptoms in Older Women

The research extended beyond middle-aged cohorts by testing the menopausal protein score across four independent older female cohorts involving 11,925 women with an average age ranging from 60.7 to 72.1 years. Higher menopausal protein scores generally correlated with poorer cognitive aging performance. Within the UK Biobank dataset, elevated scores also associated with an increased risk of developing Alzheimer’s-type dementia later in life. This association did not extend to other types of dementia, such as frontotemporal dementia, vascular dementia, or all-cause dementia. The study also evaluated how common menopausal symptoms relate to these protein changes. Among the initial 80 women, night sweats correlated with higher menopausal protein scores, whereas hot flashes alone did not reach statistical significance. In a separate group of older women, frequent hot flashes associated with elevated inflammation-related proteins, while sleep issues associated with higher levels of BACE1 and IGF1R proteins.