The aim of the present study was to determine the effects of labour and mode of delivery on human placental and fetal membrane content of adrenomedullin (AdM). Placentas and fetal membranes were collected either at term or pre-term gestation from women either in labour or not in labour, and AdM was measured in tissue extracts by specific RIA. There were significant increases in AdM concentrations in amnion and choriodecidua for the in-labour group compared with the not-in-labour group for both pre-term and term gestations. There was no difference in AdM concentration in placental tissue between labour groups. This study provides evidence that fetal membrane AdM is increased in amniotic and choriodecidual tissues in response to labour, and suggests that it may play a role during human labour.

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