Previous pregnancies might mitigate cortical brain differences associated with surgical menopause

Area of Science:

• Neuroscience
• Endocrinology
• Gerontology

Background:

• Surgical menopause causes abrupt estrogen decline, unlike gradual perimenopause, potentially increasing dementia risk.
• Motherhood involves significant, long-lasting neuroendocrine adaptations.
• Previous research suggests a link between surgical menopause and later-life dementia risk.

Purpose of the Study:

• To compare whole-brain cortical volume differences between women experiencing surgical versus non-surgical menopause.
• To investigate the influence of previous childbearing (parity) on these cortical differences.
• To explore the relationship between age at first pregnancy and cortical volume in surgically menopausal women.

Main Methods:

• Surface-based neuroimaging techniques were used to analyze cortical volume.
• The study included 201 middle-aged women: 134 with non-surgical menopause and 67 with surgical menopause.
• Participants were categorized based on menopausal status and parity (childbearing history).

Main Results:

• Women with surgical menopause exhibited significant atrophy in frontal and temporal brain regions.
• Nulliparous women with surgical menopause had lower cortical volume in the left temporal gyrus, medial temporal lobe cortex, and bilateral precuneus compared to parous women with surgical menopause.
• No significant cortical volume differences were found between parous women with surgical menopause and women with non-surgical menopause (parous or nulliparous).
• In the surgical menopause group, a negative correlation existed between cortical volume and age at first pregnancy in the temporal lobe.

Conclusions:

• The study suggests that the neural adaptations from childbirth may buffer the brain against the effects of sudden estrogen loss from surgical menopause.
• Sudden estrogen decline in surgical menopause is associated with brain atrophy, particularly in the frontal and temporal lobes.
• Parity appears to play a protective role in brain structure following surgical menopause.