Effect of constant light on fetal and maternal prolactin rhythms in sheep

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dc.contributor.authorParraguez, VH
dc.contributor.authorValenzuela, GJ
dc.contributor.authorVergara, M
dc.contributor.authorDucsay, CA
dc.contributor.authorYellon, SM
dc.contributor.authorSeronFerre, M
dc.date.accessioned2025-01-21T01:34:01Z
dc.date.available2025-01-21T01:34:01Z
dc.date.issued1996
dc.description.abstractA 24-h rhythm of plasma PRL is present in fetal sheep. This rhythm is synchronized to an environmental clue (zeitgeber). We determined whether the light-dark cycle (L:D) is a zeitgeber for the fetal PRL rhythm and, if so, whether the mother might convey this zeitgeber to the fetus. We kept nine ewes (twin pregnancies) in constant light (L:L) and five ewes (singleton) in 14:10 L:D from 110 days gestation. Fetuses and mothers were catheterized at 119 days gestation. Blood samples were taken hourly for 24 h after 16 days under L:L or L:D. A mean 24-h rhythm of PRL was found (by RIA) in fetuses under L:D, but not in those under L:L. However, fetuses under L:L showed individual 24-h PRL rhythms (cosinor analysis) whose acrophases were distributed around the clock. Nonsynchronized rhythms persisted after 23 and 30 days of L:L. Acrophases of PRL rhythms within a set of twins were closer than those between sets, suggesting that twins were responding to a common signal. These findings indicate that the L:D cycle is a zeitgeber for the PRL rhythm in fetal sheep and suggest that the mother might convey the zeitgeber.
dc.fuente.origenWOS
dc.identifier.eissn1945-7170
dc.identifier.issn0013-7227
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/97503
dc.identifier.wosidWOS:A1996UM80200022
dc.issue.numero6
dc.language.isoen
dc.pagina.final2361
dc.pagina.inicio2355
dc.revistaEndocrinology
dc.rightsacceso restringido
dc.subject.ods03 Good Health and Well-being
dc.subject.odspa03 Salud y bienestar
dc.titleEffect of constant light on fetal and maternal prolactin rhythms in sheep
dc.typeartículo
dc.volumen137
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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