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Catecholamines in experimentally growth-retarded rat fetus
T Hiraoka1, T Kudo, Y Kishimoto
1Department of Obstetrics and Gynecology, Okayama University Medical School, Japan.
Asia-Oceania Journal of Obstetrics and Gynaecology
|December 1, 1991
Summary
Intrauterine growth restriction (IUGR) in fetal rats shows higher amniotic fluid epinephrine and norepinephrine. Decreased adrenal epinephrine in IUGR fetuses impairs defense mechanisms during stress.
Area of Science:
- Reproductive Biology
- Developmental Physiology
- Endocrinology
Background:
- Intrauterine growth restriction (IUGR) impacts fetal development and stress response.
- The sympathoadrenal system plays a crucial role in managing physiological stress.
Purpose of the Study:
- To investigate the sympathoadrenal system's function in rat fetuses with IUGR.
- To assess catecholamine levels and adrenal gland function in IUGR fetuses.
Main Methods:
- Utilized the Wigglesworth method to induce IUGR in rat fetuses.
- Analyzed amniotic fluid and adrenal gland catecholamine concentrations (dopamine, norepinephrine, epinephrine) and enzyme activity.
- Evaluated plasma catecholamine levels following acute hemorrhagic shock.
Main Results:
- IUGR fetuses exhibited higher amniotic fluid norepinephrine and epinephrine.
- Adrenal glands in IUGR fetuses showed decreased L-dopa and catecholamines, with a lower epinephrine to L-dopa ratio.
- Despite normal adrenal epinephrine synthesis, IUGR fetuses had depleted adrenal epinephrine reserves.
- Post-hemorrhagic shock, IUGR fetuses showed lower plasma epinephrine but higher dopamine and norepinephrine.
Conclusions:
- Elevated amniotic fluid catecholamines in IUGR may indicate a chronic stress response.
- Depleted adrenal epinephrine in IUGR fetuses compromises their defense mechanisms against acute stress.
- The findings suggest a potential link between reduced adrenal epinephrine and impaired stress resilience in IUGR.