Study links pregnancy-related forgetfulness to estrogen-driven brain circuit disruption
Researchers identified a hypothalamus-hippocampus pathway disrupted by high estrogen as the cause of “momnesia” memory lapses in pregnant women.
A team led by Zheng Sun and Yanlin He found that sustained high estrogen during pregnancy overstimulates hypothalamic GABAergic neurons, which then inhibit the hippocampus and impair memory. In mouse models, elevated estrogen produced short-term memory loss, which was reversed when the hypothalamus-to-hippocampus pathway was deactivated or estrogen receptors were removed. Parallel memory tests on 70 pregnant and non-pregnant women revealed poorer performance in late pregnancy, matching measured estrogen levels.
The researchers note that the human data support the proposed mechanism but cannot establish direct causality. They describe “momnesia” as a widespread, non-disabling condition affecting about 80 % of pregnant women, usually fading after childbirth.
Why it matters
Understanding the hormonal basis of pregnancy-related memory lapses can reassure expectant mothers and guide future interventions.
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