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Spalek, Klara; Straathof, Milou; Koyuncu, Lal; Grydeland, Håkon; van der Geest, Anouk; van‘t Hof, Sophie R.; Crone, Eveline A.; Barba-Müller, Erika; Carmona, Susana; Denys, Damiaan; Tamnes, Christian K.; Burke, Sarah; Hoekzema, Elseline
Psychoneuroendocrinology, June 2024, 2024-Jun, 2024-06-00, 20240601, Letnik: 164Journal Article
Animal studies have shown that pregnancy is associated with neural adaptations that promote maternal care. The hypothalamus represents a central structure of the mammalian maternal brain and hormonal priming of specific hypothalamic nuclei plays a key role in the induction and expression of maternal behavior. In humans, we have previously demonstrated that becoming a mother involves changes in grey matter anatomy, primarily in association areas of the cerebral cortex. In the current study, we investigated whether pregnancy renders anatomical changes in the hypothalamus. Using an advanced delineation technique, five hypothalamic substructures were defined in longitudinal MRI scans of 107 women extracted from two prospective pre-conception cohort studies, including 50 women who were scanned before and after pregnancy and 57 nulliparous control women scanned at a similar time interval. We showed that becoming a mother is associated with volume reductions in the anterior-superior, superior tuberal and posterior hypothalamus. In addition, these structural changes related to hormonal levels during pregnancy and specific aspects of self-reported maternal behavior in late pregnancy, including maternal-fetal attachment and nesting behavior. These findings show that pregnancy leads to changes in hypothalamic anatomy and suggest that these contribute to the development of maternal behavior in humans, supporting the conservation of key aspects of maternal brain circuitry and their role in maternal behavior across species. •Hypothalamic substructures were defined in longitudinal MRI scans of 107 women.•50 women were scanned before and after pregnancy, and 57 controls at same interval.•Volumetric decreases occur across pregnancy in hypothalamic subregions in humans.•Hypothalamic volume changes relate to prenatal maternal behavior.
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