Characterization and gestational regulation of corticotropin-releasing hormone messenger RNA in human placenta.
Corticotropin-releasing hormone (CRH), a hypothalamic neuropeptide involved in the regulation of ACTH secretion, has been detected by RIA in extracts of human placenta. We wished to determine whether this immunoreactive substance is a product of CRH gene expression in the placenta. We have found authentic human CRH (hCRH) mRNA in human placental tissue that is similar in size to hypothalamic CRH mRNA. Furthermore, the transcriptional initiation site for placental hCRH mRNA is identical to that previously predicted for hypothalamic hCRH mRNA, 23-26 nucleotides downstream from a canonical promoter element. Placental hCRH mRNA increases more than 20-fold in the 5 wk preceding parturition, in parallel with a rise in placental hCRH peptide content. These data strongly suggest that the hCRH gene is expressed in the placenta and that this expression changes dramatically during gestation.
Frim
D M
DM
Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts 02115.
Emanuel
R L
RL
Robinson
B G
BG
Smas
C M
CM
Adler
G K
GK
Majzoub
J A
JA
D001483:Base Sequence; D003346:Corticotropin-Releasing Hormone / Q000235:genetics / Q000302:isolation & purification* / Q000378:metabolism; D005260:Female; D005786:Gene Expression Regulation; D005865:Gestational Age; D006801:Humans; D008969:Molecular Sequence Data; D009693:Nucleic Acid Hybridization; D010442:Peptide Chain Initiation, Translational; D010920:Placenta / Q000378:metabolism / Q000502:physiology*; D011247:Pregnancy; D012333:RNA, Messenger / Q000302:isolation & purification / Q000378:metabolism*; D014158:Transcription, Genetic
D012333:RNA, Messenger; D003346:Corticotropin-Releasing Hormone