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Ultrasonography in Experimental Reproductive Investigations on Rats
Published on: December 2, 2017
Atrial natriuretic factor release during pregnancy in rats
The Journal of Physiology
|October 15, 1995
Summary
Pregnancy alters atrial natriuretic factor (ANF) secretion control. Basal ANF levels change during gestation, and the heart
Area of Science:
- Endocrinology
- Cardiovascular Physiology
Background:
- Atrial natriuretic factor (ANF) plays a crucial role in cardiovascular homeostasis.
- Understanding ANF regulation during physiological states like pregnancy is vital.
Purpose of the Study:
- To investigate the control of atrial natriuretic factor (ANF) secretion during pregnancy.
- To determine the influence of pregnancy on basal and stretch-induced ANF release.
Main Methods:
- Plasma ANF levels were measured in virgin and pregnant rats under basal and atrial stretch conditions.
- Hormonal influences were assessed using ovariectomized rats treated with progesterone and/or oestradiol.
- Measurements were taken at various stages of pregnancy and postpartum.
Main Results:
- Basal plasma ANF levels were elevated during early to mid-pregnancy (7-14 days) and postpartum, returning to prepregnant levels by day 21.
- Atrial stretch significantly increased ANF in virgin rats but this response was attenuated in pregnant and postpartum rats.
- Exogenous oestradiol increased ANF levels in acyclic rats, while progesterone had no effect.
Conclusions:
- Pregnancy differentially influences basal and stretch-induced ANF secretion.
- Oestradiol emerges as a potential stimulatory factor for ANF secretion.
