Lifetime estrogen exposure and domain-specific cognitive performance: results from the IGNITE study

Area of Science:

• Neuroscience
• Endocrinology
• Gerontology

Background:

• Estrogen exposure disruptions, like surgical menopause, are linked to cognitive aging and dementia risk.
• Previous studies on hormone therapy and cognition show mixed results, potentially due to limited cognitive assessments.
• The role of estrogen in cognitive function across the lifespan requires further investigation, especially concerning different forms of hormone therapy.

Purpose of the Study:

• To investigate the association between surgically induced menopause (oophorectomy) and cognitive performance.
• To examine how the timing and duration of birth control and menopausal hormone therapy influence cognitive function.
• To determine if APOE4 carrier status interacts with oophorectomy and hormone therapy in relation to cognitive performance.

Main Methods:

• Analysis of baseline data from 461 post-menopausal women (mean age 69.6) in the IGNITE study.
• Assessment of oophorectomy and hormone therapy use (birth control, menopausal hormone therapy).
• Cognitive evaluation using the Montreal Cognitive Assessment (MoCA) and detailed composite scores for memory, processing speed, executive function, and visuospatial processing.

Main Results:

• Oophorectomy prior to natural menopause was not associated with poorer cognitive performance.
• Hormone therapy use was linked to improved episodic memory, working memory, and visuospatial processing.
• Birth control use correlated with better MoCA scores, working memory, and executive function/attentional control.

Conclusions:

• Estrogen exposure during adulthood via birth control and hormone therapy benefits cognitive function in older women.
• The findings highlight the potential protective effects of exogenous estrogen on cognitive aging.
• Further research is needed to elucidate the causal mechanisms linking lifetime estrogen exposure to cognitive health in later life.