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. 1989 Dec;84(6):1997–2001. doi: 10.1172/JCI114390

Placental corticotropin-releasing hormone may be a stimulator of maternal pituitary adrenocorticotropic hormone secretion in humans.

A Sasaki 1, O Shinkawa 1, K Yoshinaga 1
PMCID: PMC304083  PMID: 2556451

Abstract

To clarify the physiological role of placental corticotropin-releasing hormone (CRH), we measured plasma CRH, ACTH, and cortisol throughout pregnancy. Cerebrospinal fluid (CSF) CRH levels and ACTH responsiveness to synthetic CRH were also quantified in pregnant and nonpregnant women. Maternal plasma CRH levels, which increased progressively during pregnancy, correlated well with both ACTH and cortisol in early labor, delivery, and postpartum samples, and also with cortisol levels in samples before labor. CSF CRH levels in term pregnant women did not differ from those of nonpregnant women. CRH infusion that attained similar plasma CRH levels to those found in late pregnancy elicited significant ACTH release in vivo and regular CRH test provoked normal ACTH response during early pregnancy but no response during late pregnancy. We concluded that: (a) maternal pituitary-adrenal axis correlates well with plasma CRH levels, which are high enough to provoke ACTH release from maternal pituitary; (b) hypothalamic CRH secretion in term pregnant women is not exaggerated; and (c) maternal pituitary is responsive to synthetic CRH in early but not late pregnancy, suggesting that maternal pituitary-adrenal axis is already activated by high circulating CRH. Placental CRH may be an important stimulator of the maternal pituitary-adrenal axis during pregnancy.

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Selected References

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