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Neurohypophysial hormone secretion in hyperprolactinaemic women
F Laczi1, A Szasz, M Vecsernyes
1Endocrine Unit, Albert Szent-Györgyi Medical University, Szeged, Hungary.
Neuropeptides
|December 9, 1998
Summary
Hyperprolactinemia causes water retention by altering arginine-8-vasopressin (AVP) and oxytocin (OXT) secretion, despite normal prolactin (PRL) levels. This suggests a link between PRL and hormonal regulation of water balance.
Area of Science:
- Endocrinology
- Nephrology
- Reproductive Biology
Background:
- Prolactin (PRL) influences water-electrolyte balance, but mechanisms are unclear.
- Osmolar changes affect PRL secretion, indicating a feedback loop.
- Hyperprolactinemia's impact on key hormones regulating fluid balance needs elucidation.
Purpose of the Study:
- To investigate the effects of hyperprolactinemia on arginine-8-vasopressin (AVP), oxytocin (OXT), and cortisol secretion.
- To clarify the role of PRL in regulating water-electrolyte balance and fluid homeostasis.
Main Methods:
- Clinical study involving healthy women and hyperprolactinemic females.
- Oral water load (OWL) test to assess hormonal responses.
- Plasma AVP and OXT measured by radioimmunoassay; cortisol by fluorimetry.
Main Results:
- In healthy women, OWL suppressed AVP, OXT, cortisol, and tended to decrease PRL.
- Hyperprolactinemic females exhibited water retention post-OWL with paradoxical AVP and OXT increases.
- PRL levels remained unchanged in hyperprolactinemic subjects during the OWL; cortisol response was normal.
Conclusions:
- Alterations in arginine-8-vasopressin and oxytocin hypersecretion may contribute to water retention in hyperprolactinemia.
- The study suggests a complex interplay between prolactin and vasopressin/oxytocin in fluid balance regulation.
- Further research is needed to fully understand the mechanisms linking hyperprolactinemia to water retention.