Journal of Clinical Endocrinology & Metabolism, Vol 63, 1199-1203, Copyright © 1986 by Endocrine Society

ARTICLES

High levels of corticotropin-releasing hormone immunoactivity in maternal and fetal plasma during pregnancy

RS Goland, SL Wardlaw, RI Stark, LS Brown Jr and AG Frantz

Corticotropin-releasing hormone immunoactivity (CRHi) was measured in the plasma of 31 pregnant women and 6 nonpregnant women as well as in the umbilical cord plasma of 40 term fetuses. CRHi was not detectable (less than 44 pg/ml) in the plasma of 6 nonpregnant women or in 6 women in the first trimester of pregnancy. Mean plasma CRHi rose progressively to 58 +/- 18 and 270 +/- 68 pg/ml during the second and third trimesters, respectively, and again became undetectable within 24 h after delivery. Mean CRHi in 40 umbilical cord plasma samples was 136 +/- 16 pg/ml. Gel filtration of both fetal and maternal plasma showed that the majority of the CRHi eluted in the same position as synthetic human CRH. There was no significant correlation between CRHi and either beta-endorphin or ACTH in umbilical cord plasma, suggesting that this CRHi may not be primarily responsible for the release of beta-endorphin and ACTH into fetal plasma at delivery. A close correlation (r = 0.82) was found between simultaneously obtained maternal and umbilical cord plasma CRHi in 10 maternal-fetal pairs, supporting a common source for this peptide in maternal and fetal circulation. A placental source for fetal and maternal CRHi was suggested by the finding of a higher CRHi concentration in the umbilical vein than in the umbilical artery and by the disappearance of this peptide from maternal plasma after delivery. We conclude that a large amount of CRHi is secreted by the placenta into both the maternal and fetal circulation during pregnancy and suggest that this may be an important modulator of the maternal and fetal hypothalamic-pituitary-adrenal axis during gestation.

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