TL;DR
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Researchers identified 16 blood molecules whose levels increased across the menopause transition and that are implicated in brain aging or dementia risk. In separate cohorts, higher levels of the proteins were associated with poorer cognitive outcomes and a modestly greater risk of Alzheimer’s dementia, but the study does not show that menopause causes the disease.
Researchers from the University of California, Santa Barbara, the University of California, San Francisco, and collaborators identified 16 blood molecules that increased across the menopause transition and are linked to biological processes involved in brain aging and dementia risk. The study, published in Nature Medicine, also found that higher levels of the proteins were associated with poorer cognitive outcomes in older women, but the findings do not establish that menopause causes Alzheimer’s disease.
The team used advanced proteomic methods to examine thousands of proteins in women at premenopausal, perimenopausal and postmenopausal stages who were part of UCSB’s Healthy Aging Study. The researchers identified changes in proteins associated with inflammation and neuronal processes, along with molecules linked to Alzheimer’s disease. In that analysis, protein patterns tracked menopause stage more closely than participants’ exact ages, according to the study report.
The researchers checked their findings against data from more than 2,800 women in the UK Biobank. That analysis also linked menopause with molecular signatures associated with accelerated aging across multiple organ systems. The team then examined four other cohorts, totaling nearly 12,000 older women, to assess whether the protein patterns related to later brain health.
In those cohorts, women with higher levels of the identified “risk” proteins were more likely to have poorer cognitive outcomes. In the largest cohort, the protein signature was associated with a modestly greater risk of Alzheimer’s dementia over the following 16 years. The report does not provide a basis for treating the proteins as a diagnostic test or say that an individual’s results can predict whether she will develop dementia.
Menopause May Offer a Window on Brain Health
The findings point to the menopause transition as a period when measurable biological changes may be associated with long-term brain health. If future research confirms how these protein patterns develop and what they predict, they could help scientists identify which midlife changes reflect risk and which may be part of normal variation. That work could also guide research into when prevention strategies might be most useful.
The researchers’ longer-term aim is to develop a blood test that could help assess dementia risk, in a role they compare with cholesterol testing for heart disease risk. That is a research goal, not a test currently established by this study. The results also do not mean that menopause itself is a disease or that women with these protein changes will develop Alzheimer’s.
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How the Researchers Traced Protein Changes
The study, led by Madeline Wood Alexander of Sunnybrook Research Institute and Rowan Saloner and Kaitlin Casaletto of UCSF, brought together researchers from UCSB, UCSF, Stanford University, the University of Toronto and other institutions. Its central question was how biological changes around menopause might relate to brain aging later in life, rather than whether menopause directly causes dementia.
Emily Jacobs, a UCSB professor of psychological and brain sciences, described menopause as a whole-body biological transition and said the study offers a way to examine its molecular signature in blood. Senior author Casaletto said midlife may be a period when brain resilience or vulnerability develops, and that menopause could be an especially relevant time for women to study. Both statements describe the researchers’ interpretation and motivation, not proof of a causal effect.
The paper, “Blood proteomics of menopause map to brain aging and dementia risk,” was published in Nature Medicine. The work received support in part from the Ann S. Bowers Women’s Brain Health Initiative, Wellcome Leap, the National Institutes of Health and the Noyce Trust.
“Menopause is not an isolated reproductive event. It is a whole-body biological transition.”
— Emily Jacobs, professor of psychological and brain sciences at UCSB
Causation and Individual Risk Remain Unknown
The study reports associations rather than proof of cause and effect. It does not show whether menopause-related hormone changes produce the protein shifts, whether other factors contribute, or how those changes unfold within the same person over time. The clinical meaning of individual Alzheimer’s-related protein changes detected in midlife also remains uncertain, the researchers said.
The report does not establish how accurately the protein signature could forecast dementia for an individual, what threshold would count as elevated risk, or whether acting on a test result would improve health outcomes. Most women do not develop Alzheimer’s, Casaletto noted. The finding of a modest association in one large cohort should not be read as a prediction for any particular woman.
Longitudinal Research Is Now Planned
The researchers say studies following the same women across the menopause transition are needed to track how hormones, proteins, symptoms and brain health change together. UCSB’s team and collaborators are launching the Longitudinal Menopause Project and are recruiting researchers, according to the study report. Following participants over time could help clarify whether the protein patterns precede later cognitive changes and how strongly they relate to them.
Further validation would also be needed before the proposed blood test could be used clinically. The next steps include determining whether the findings hold in longitudinal data, clarifying the clinical significance of the proteins and testing whether any midlife intervention can change later outcomes. The current study establishes a research link to investigate; it does not prescribe a screening schedule or treatment.
Key Questions
What did the study find?
Researchers identified 16 molecules in blood that increased across menopause stages and were linked to processes associated with brain aging or dementia risk. Higher levels were associated with poorer cognitive outcomes in older women.
Does the study show that menopause causes Alzheimer’s disease?
No. The findings are associations, and the study does not show that menopause or the measured proteins cause Alzheimer’s. The researchers said the clinical meaning of individual protein changes remains uncertain.
Is there a blood test based on these findings?
No clinical test is established by this study. The team described developing a blood test as a longer-term research goal; its accuracy and usefulness for individual patients have not been demonstrated here.
What research comes next?
The authors say longitudinal studies that follow women through menopause are needed. UCSB and collaborators are launching the Longitudinal Menopause Project to examine changes in hormones, proteins, symptoms and brain health over time.
Source: news-medical.net
