Oxytocin release after bleeding in rat: the role of sympathetic and renin-angiotensin system

Lipińska, S.; Zebrowska-Badalla, A.; Lipińska, J.

Journal of Physiology and Pharmacology An Official Journal of the Polish Physiological Society 57(4): 627-636

2006


ISSN/ISBN: 0867-5910
PMID: 17229986
Document Number: 595203
The aim of this experiment was to compare the role of renin-angiotensin and sympathetic nervous system in post-haemorrhagic mechanism of oxytocin release. Oxytocin content in venous dialysates was determined by radioimmunoassay. In control rats the release of oxytocin into dialysates did not change during whole experiment. The injection of captopril induced 2-fold higher oxytocin release, but caused no change in oxytocin release after bleeding. Superior cervical ganglionectomy (SCGx) 20 days before, caused 5-fold higher increase in oxytocin release than in control group. Injection of captopril in rats after SCGx, did not decrease the high level of oxytocin in dialysate. However, bleeding increased oxytocin release and 1 hour after bleeding the highest - 14-fold increase, took place. In the contrary to 14-fold increase in oxytocin release in animals with superior cervical ganglia (SCG), bleeding after SCGx caused only 2-fold higher oxytocin release. When SCGx, bleeding and injection of captopril were done simultaneously, oxytocin release remained on the control concentration level. We assumed that blockade of renin angiotensin system and sympathetic dennervation prevent the increase in oxytocin release after bleeding. On basis of our present experiments, it can be assumed that, in posthaemorrhagic oxytocin release into the blood, sympathetic innervation derived from SCGx, as well as, renin-angiotensin system are involved.

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