Steroids, reproductive endocrine function, and cognition. A review

Area of Science:

• Neuroscience
• Endocrinology
• Gerontology

Background:

• Estrogen (E2) plays a role in women's cognitive health, but findings on its post-menopausal effects are conflicting.
• Observational studies and basic research suggest E2 may reduce cognitive decline, yet large trials like the Women's Health Initiative Study reported increased dementia risk with hormone replacement therapy (HRT).
• Discrepancies may stem from varied HRT types, initiation timing, and the influence of other steroid hormones like progestins and androgens.

Purpose of the Study:

• To review and synthesize current findings on estrogen (E2) and hormone replacement therapy (HRT) in post-menopausal women.
• To explore the potential synergistic effects of E2 with progestins and androgens on cognitive function.
• To examine the impact of different HRT options on cognitive abilities and neurodegenerative disease risk.

Main Methods:

• Literature review of animal and human studies.
• Analysis of findings related to various hormone replacement therapy (HRT) options.
• Synthesis of data on brain interactions, cognitive effects, and neurodegenerative disease risk.

Main Results:

• Conflicting evidence exists regarding estrogen's (E2) impact on post-menopausal cognition.
• The role of progestins and androgens in modulating E2's effects on cognition requires further investigation.
• Different HRT formulations and timing may influence cognitive outcomes and dementia risk.

Conclusions:

• Understanding the complex interactions of hormones, HRT options, and timing is crucial for managing cognitive health in aging women.
• Further research is needed to clarify the role of combined hormone therapies in preventing cognitive decline and neurodegenerative diseases.
• This review highlights the need for personalized HRT strategies considering individual hormonal profiles and menopausal status.