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  • Title: Immunoreactive corticotropin-releasing hormone in amniotic fluid.
    Author: Sasaki A, Shinkawa O, Yoshinaga K.
    Journal: Am J Obstet Gynecol; 1990 Jan; 162(1):194-8. PubMed ID: 2301493.
    Abstract:
    Immunoreactive corticotropin-releasing hormone in the amniotic fluid of both human beings and rats was measured by a specific radioimmunoassay. In human subjects the hormone was detectable in all amniotic fluid samples (obtained during the sixteenth and eighteenth weeks of gestation) (2.5 +/- 1.7 fmol/ml, mean +/- SD, n = 17) and the thirty-eighth to fortieth weeks (9.3 +/- 5.4 fmol/ml, n = 24). The levels of concentration of this hormone in this amniotic fluid correlated significantly with the levels in both maternal plasma and placenta for each patient. Gel filtration of amniotic fluid extracts revealed two major peaks of immunoreactive corticotropin-releasing hormone, one at the elution position of the rat hormone and the other at a small-molecular-weight region. Immunoreactive corticotropin-releasing hormone was not detectable in rat amniotic fluid or placenta. We concluded that immunoreactive corticotropin-releasing hormone, which may be derived from the placenta, is present in human amniotic fluid and that its detection in the human placenta but not in rat placentas suggests that the mechanism of corticotropin-releasing hormone gene expression in the placenta is species specific.
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