de.mpg.escidoc.pubman.appbase.FacesBean
Deutsch
 
Hilfe Wegweiser Impressum Kontakt Einloggen
  DetailsucheBrowse

Datensatz

DATENSATZ AKTIONENEXPORT

Freigegeben

Zeitschriftenartikel

Increased hypothalamic expression of prolactin in lactation: involvement in behavioural and neuroendocrine stress responses

MPG-Autoren

Torner,  L
Max Planck Institute of Psychiatry, Max Planck Society;

Toschi,  N
Max Planck Institute of Psychiatry, Max Planck Society;

Nava,  G
Max Planck Institute of Psychiatry, Max Planck Society;

Clapp,  C
Max Planck Institute of Psychiatry, Max Planck Society;

Neumann,  ID
Max Planck Institute of Psychiatry, Max Planck Society;

Externe Ressourcen
Es sind keine Externen Ressourcen verfügbar
Volltexte (frei zugänglich)
Es sind keine frei zugänglichen Volltexte verfügbar
Ergänzendes Material (frei zugänglich)
Es sind keine frei zugänglichen Ergänzenden Materialien verfügbar
Zitation

Torner, L., Toschi, N., Nava, G., Clapp, C., & Neumann, I. (2002). Increased hypothalamic expression of prolactin in lactation: involvement in behavioural and neuroendocrine stress responses. European Journal of Neuroscience, 15(8), 1381-1389.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-000E-A221-E
Zusammenfassung
Prolactin (PRL) has recently been shown to exert an anxiolytic effect in male and virgin female rats, as well as an inhibitory tone on hypothalamic-pituitary-adrenal (HPA) axis activity. Reduced emotional and neuroendocrine stress responses have been described in lactation, a time of high blood PRL levels. Here we tested brain PRL-receptor (PRL-R)-mediated effects on anxiety, maternal behaviour, HPA axis and oxytocin stress responses in lactating rats. Chronic intracerebroventricular (i.c.v.) infusion of antisense oligonucleotides against the long form of the PRL-R (AS; osmotic minipump, 0.5 mug/0.5 muL/h) in order to downregulate brain PRL-R expression increased the anxiety-related behaviour on the elevated plus maze (P<0.01) compared with mixed bases- and vehicle-treated rats. Also, PRL-R AS treatment impaired maternal behaviour (P<0.05), whereas physiological parameters of lactation (weight gain of the litter, number of milk ejection reflexes during a 20-min suckling period) were not affected. PRL-R AS treatment further evoked an increase (P<0.05) in the stress-induced adrenocorticotropin release, demonstrating an inhibitory role of PRL on HPA axis responses in lactation. Inhibition of stress responses of the oxytocin system by brain PRL was evidenced by higher stress-induced (P<0.05) plasma oxytocin concentration in PRL-R AS-treated lactating rats and, in contrast, decreased stress-induced oxytocin release (P<0.01) in chronic i.c.v. ovine PRL-treated (1 mug/0.5 muL/h) virgin rats. Finally, an increased expression of the hypothalamic PRL gene was seen by RT-PCR in pregnancy and lactation, suggesting an activated state of the brain PRL system during the peripartum period. In summary, activation of the brain PRL system in the peripartum period significantly contributes to emotional and neuroendocrine adaptations, including downregulation of the responsiveness of the HPA axis and oxytocin systems to stressors seen at this tim