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INTERRELATIONSHIP BETWEEN CORTISOL AND ATRIAL NATRIURETIC FACTOR IN THE IMMATURE OVINE FETUS
Author(s) -
Wintour E. Marelyn,
Cooper Elizabeth,
McDougall John G.,
Shine Peter F.,
Towstoless Michelle K.
Publication year - 1989
Publication title -
clinical and experimental pharmacology and physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 103
eISSN - 1440-1681
pISSN - 0305-1870
DOI - 10.1111/j.1440-1681.1989.tb01628.x
Subject(s) - fetus , endocrinology , medicine , saline , gestation , excretion , sodium , chemistry , pregnancy , biology , genetics , organic chemistry
SUMMARY 1. In chronically cannulated ovine fetuses (100–130 days of gestation) the infusion of cortisol (86.7 ± 15 μg/h for 4 h) or human atrial natriuretic factor (ANF; 4.4 μg for 2 h) resulted in highly significant increases in the excretion of sodium, chloride, potassium and water. 2. Cortisol had no significant effect on fetal plasma ANF concentrations. All values are mean and s.e.m. Plasma immunoreactive ANF was 53 ± 5 and 67.3 ± 13 pmol/L in the 4 h saline infused fetuses, and 51.3 ± 14.3 and 74 ± 13.3 pmol/L in cortisol‐infused fetuses ( n = 7). A separate group of fetuses received 2 h infusions of saline or hANF (4.4 ug/h), and plasma IR‐ANF values were measured ( n = 3). The values, at 0, 60, 90 and 120 min were, respectively, 19.7 ± 3, 17.3 ± 0.7, 18.7 ± 3.7 and 20.7 ± 3.7 pmol/L in the saline infused group, and 25.3 ± 5.3, 80.7 ± 32.3, 123.3 ± 4.3 and 100 ± 15 pmol/L in the ANF‐infused fetuses. 3. Blood cortisol concentrations, in fetuses infused for 4 h with 0.9% NaCl, were 3.1 ± 0.8 nmol/L ( n = 7); in fetuses infused with 0.9% NaCl for 2 h were 3.6 ± 1 nmol/L ( n = 3); in fetuses infused for 4 h with cortisol were 19.9 ± 1.9 nmol/L ( n = 7); and in fetuses infused with hANF for 2 h were 6.0 ± 3.0 nmol/L ( n = 5). 4. There was no effect of fetal hANF infusion on maternal or fetal blood aldosterone concentrations. 5. The conclusion of this study was that cortisol and ANF cause natriuresis and diuresis in the immature ovine kidneys by independent mechanisms.