Effects of fasting on serum lactogenic hormone concentrations during mid- and late pregnancy in mice

1987 ◽  
Vol 253 (1) ◽  
pp. E40-E44 ◽  
Author(s):  
P. J. Fielder ◽  
L. Ogren ◽  
D. Edwards ◽  
F. Talamantes
Keyword(s):  
Fatty Acids ◽  
Growth Hormone ◽  
Free Fatty Acids ◽  
Late Pregnancy ◽  
Placental Lactogen ◽  
Metabolic Responses ◽  
Maternal Response ◽  
Lactogenic Hormone ◽  
Pregnant Mice

Hormonal and metabolic responses to fasting were studied in pregnant Swiss Webster mice. Food was removed from pregnant mice 12, 24, 36, or 48 h before death on day 12 or 15 of pregnancy. Serum mouse placental lactogen-II (mPL-II), mouse growth hormone (mGH), mouse prolactin (mPRL), free fatty acids (FFA), and glucose concentrations were determined for each group. In comparing fasted animals with fed controls, there was a significant increase in the serum mPL-II concentration after 24 and 48 h of fasting on day 12 and after 12, 36, and 48 h of fasting on day 15. Fasting significantly decreased the glucose and increased the FFA concentration of the serum at all fasting periods. Fasting had no effect on serum mPRL or mGH concentrations. In the second part of this study, pregnant mice were fasted for 24 h and then refed for an additional 24 h before being killed on day 12 of pregnancy. The changes in serum mPL-II, glucose, and FFA concentrations that occurred after a 24-h fast on day 12 of pregnancy were completely reversed by refeeding the animals for 24 h. Results from both studies indicate the involvement of mPL-II in the maternal response to fasting in pregnant mice.

Effects of Free Fatty Acids on Luteinizing Hormone and Growth Hormone Secretion in Ovariectomized Lambs*

Endocrinology ◽  
1990 ◽  
Vol 126 (4) ◽  
pp. 1934-1940 ◽  
Author(s):  
M. J. ESTIENNE ◽  
K. K. SCHILLO ◽  
S. M. HILEMAN ◽  
M. A. GREEN ◽  
S. H. HAYES ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Growth Hormone ◽  
Luteinizing Hormone ◽  
Free Fatty Acids ◽  
Hormone Secretion ◽  
Growth Hormone Secretion

Effect of insulin on free fatty acid uptake by hepatocytes in the duck

1984 ◽  
Vol 102 (3) ◽  
pp. 381-386 ◽  
Author(s):  
R. Gross ◽  
P. Mialhe
Keyword(s):  
Fatty Acids ◽  
Growth Hormone ◽  
Fatty Acid ◽  
Free Fatty Acid ◽  
Glucose Metabolism ◽  
Free Fatty Acids ◽  
Fatty Acid Uptake ◽  
Acid Uptake ◽  
Low Doses ◽  
Higher Doses

ABSTRACT To elucidate the hypolipacidaemic effect of insulin in ducks, its action on the uptake of free fatty acids (FFA) by duck hepatocytes was determined. At low doses (10 mu./l) insulin stimulated FFA uptake. This effect was not observed with higher doses of insulin (20, 30 and 50 mu./l). Growth hormone at physiological concentrations and corticosterone (14·4 nmol/l) decreased basal activity, probably by reducing glucose metabolism and consequently α-glycerophosphate (α-GP) supply. Insulin was able to reverse the inhibition induced by GH and corticosterone on both FFA uptake and α-GP production. These results therefore suggest that the hypolipacidaemic effect of insulin may be partly mediated by its action on hepatic FFA uptake. J. Endocr. (1984) 102, 381–386

Interaction of free fatty acids and arginine on growth hormone secretion in man

Metabolism ◽  
1994 ◽  
Vol 43 (2) ◽  
pp. 223-226 ◽  
Author(s):  
Mauro Maccario ◽  
Massimo Procopio ◽  
Sandro Loche ◽  
Marco Cappa ◽  
Valentino Martina ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Growth Hormone ◽  
Free Fatty Acids ◽  
Hormone Secretion ◽  
Growth Hormone Secretion

scholarly journals The Control on Growth Hormone Release by Free Fatty Acids Is Maintained in Acromegaly

1999 ◽  
Vol 84 (4) ◽  
pp. 1234-1238 ◽  
Author(s):  
Roberto Lanzi ◽  
Marco Losa ◽  
Giovanna Mignogna ◽  
Andrea Caumo ◽  
Antonio Ettore Pontiroli
Keyword(s):  
Fatty Acids ◽  
Growth Hormone ◽  
Free Fatty Acids ◽  
Hormone Release ◽  
Growth Hormone Release

The effect of dietary energy concentration on protein utilization during late pregnancy in ewes

1975 ◽  
Vol 85 (1) ◽  
pp. 175-184 ◽  
Author(s):  
J. A. Guada ◽  
J. J. Robinson ◽  
C. Fraser
Keyword(s):  
Fatty Acids ◽  
Free Fatty Acids ◽  
Nitrogen Retention ◽  
Late Pregnancy ◽  
Nitrogen Utilization ◽  
Metabolizable Energy ◽  
Late Gestation ◽  
Energy Concentration ◽  
Dietary Energy ◽  
Unit Increase

SUMMARYFrom 62 days of gestation to parturition, 20 Finnish Landrace x Dorset Horn ewes were each offered one of four diets with roughage to concentrate ratios of 20:80; 40:60; 60:40 and 80:20, at daily metabolizable energy and digestible crude protein intakes of 490 kJ and 3·55 g/kg W0·75respectively. Plasma concentration of free fatty acids, glucose and urea were determined weekly, and nitrogen balance and digestibility trials were carried out at 70–80 and 130–140 days of gestation.On all treatments the concentration of plasma free fatty acids increased during pregnancy from approximately 200–600 μ-equiv./l and the concentration of glucose and urea decreased by approximately 25%.Digestibility coefficients for dry matter and organic matter increased from 58 to 68% and from 60 to 70% respectively as the proportion of concentrates in the diet increased and were not affected by stage of gestation. The apparent digestibility of nitrogen was not affected by the energy concentration of the diet.Between mid and late gestation there was a mean increase in daily nitrogen retention of 2·5 g and an improvement in the efficiency of nitrogen utilization of 19 percentage units.Nitrogen retention and the efficiency with which the apparently digested nitrogen intake was retained increased as the dietary energy concentration was increased. The mean daily increases in nitrogen retention were 0·0135 and 0·0039 g for each percentage unit increase in the concentrate portion of the diet at mid and late gestation respectively. The corresponding values for the improvement in the efficiency of nitrogen utilization were 0·13 and 0·10%.

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