Effect of glucagon on thermogenesis in the pigeon.

1977 ◽  
Vol 232 (5) ◽  
pp. E451
Author(s):  
E Hohtola ◽  
R Hissa ◽  
S Saarela
Keyword(s):  
Oxygen Consumption ◽  
Fatty Acid ◽  
Blood Glucose ◽  
Free Fatty Acid ◽  
Plasma Free Fatty Acid ◽  
Energy Reserves ◽  
Glucose Levels ◽  
Blood Glucose Levels ◽  
Plasma Ffa ◽  
Adrenergic Blocking

The effects of glucagon injection on temperature regulation and some metabolic parameters were studied in the pigeon. Glucagon (100 microng/kg) always inhibited shivering and caused a fall in the oxygen consumption and body temperature of the unanesthetized pigeon at + 6 degrees C. At + 34 degrees C, the same dose of glucagon had no effect on these parameters. At 22 degrees C, glucagon produced an elevation in plasma free fatty acid (FFA) and blood glucose levels. The rise in FFA at 22 degrees C coincided with the suppression of shivering at 6 degrees C. The glucagon-mediated rise in plasma FFA, but not glucose level, was potentiated by cold ambient temperature. Adrenergic blocking agents given prior to glucagon did not abolish its effects. Phentolamine even prolonged the absence and accelerated the suppression of shivering. A dissociation in the mechanisms by which catecholamines and glucagon suppress shivering is suggested. Although mobilizing energy reserves, glucagon does not seem to be calorigenic in the pigeon at this dose. The interpretation of the changes in plasma FFA levels is discussed in relation to fuel consumption during shivering.

HYPOGLYCEMIA AND HYPERINSULINEMIA ASSOCIATED WITH ERYTHROBLASTOSIS FETALIS

PEDIATRICS ◽  
1969 ◽  
Vol 43 (2) ◽  
pp. 217-225
Author(s):  
Kari O. Raivio ◽  
Kalle Österlund
Keyword(s):  
Fatty Acid ◽  
Blood Glucose ◽  
Free Fatty Acid ◽  
Binding Capacity ◽  
Plasma Free Fatty Acid ◽  
Glucose Levels ◽  
Blood Glucose Levels ◽  
Plasma Insulin Levels ◽  
Low Glucose ◽  
Bilirubin Binding

In a survey of blood glucose levels in 232 erythroblastotic infants during the first 3 days of life, 12 cases of significant hypoglycemia were revealed. Most of these had a severe primary disease; the incidence of hypoglycemia was 17.8% in patients with cord hemoglobin concentrations below 10 gm per 100 ml and 1.9% in those with higher cord hemoglobin levels. The low glucose values were usually observed during the first day of life and were unassociated with recognizable symptoms. Plasma insulin levels, determined in 39 cases before age 24 hours and prior to treatment, were shown to be negatively correlated with the cord hemoglobin concentrations. Hyperinsulinemia, directly correlated with the severity of the erythroblastosis, is postulated to be the cause of the low blood glucose levels. As another consequence of the hyperinsulinemia, a depression of the plasma free fatty acid concentrations was documented. The mechanism of the hyperinsulinemia, the therapeutic and prognostic implications of the hypoglycemia, as well as the effect of the depression of free fatty acid levels on the bilirubin-binding capacity of serum are briefly discussed.

Reduced running endurance in gluconeogenesis-inhibited rats

1986 ◽  
Vol 251 (1) ◽  
pp. R137-R142 ◽  
Author(s):  
H. B. John-Alder ◽  
R. M. McAllister ◽  
R. L. Terjung
Keyword(s):  
Fatty Acid ◽  
Blood Glucose ◽  
Phosphoenolpyruvate Carboxykinase ◽  
Plasma Free Fatty Acid ◽  
Hepatic Glycogen ◽  
Endurance Time ◽  
Glucose Levels ◽  
Blood Glucose Levels ◽  
Lactate Levels ◽  
Blood Lactate Levels

The functional significance of gluconeogenesis in prolonging endurance during submaximal activity was assessed in untrained and endurance-trained rats. Gluconeogenesis was inhibited at the phosphoenolpyruvate carboxykinase reaction by 3-mercaptopicolinic acid (3-MPA). Endurance was significantly reduced by 3-MPA in untrained (-32%; P less than 0.005) and in trained rats (-26%; P less than 0.001). Metabolic correlates of fatigue were examined in trained rats. At exhaustion, 3-MPA-treated rats had only 3% of resting hepatic glycogen, 46% of resting white quadriceps glycogen, and 37% of resting blood glucose. All of these substrates were at higher levels in sham-injected controls after the same duration of running (130 min). Glycogen levels in red quadriceps, blood lactate levels, and blood glycerol levels were not different between groups. Plasma free fatty acid levels were elevated to the same extent in both groups after 90 min of activity, remained high at 130 min in controls, but had returned to resting levels in the severely hypoglycemic 3-MPA-treated rats at exhaustion. The results indicate that gluconeogenesis is important for maintaining blood glucose levels and for prolonging endurance time during submaximal activity.

Studies on the carbohydrate metabolism of sheep. XIX. The metabolism of glucose, free fatty acids, and ketones after feeding and during fasting or undernourishment of non-pregnant, pregnant, and lactating ewes

1962 ◽  
Vol 13 (6) ◽  
pp. 1124 ◽  
Author(s):  
RL Reid ◽  
NT Hinks
Keyword(s):  
Blood Glucose ◽  
Blood Glucose Level ◽  
Glucose Level ◽  
Inverse Correlation ◽  
Plasma Free Fatty Acid ◽  
Glucose Levels ◽  
Blood Glucose Levels ◽  
Pregnant Sheep ◽  
Plasma Ffa ◽  
Pregnant Ewe

Average plasma free fatty acid (FFA) values in non-pregnant sheep in widely differing body condition, but fed at levels of maintenance or above, varied from 0.24 to 0.39 m-equiv.11. Values declined after feeding, while blood ketone levels increased. Plasma FFA value is a sensitive indicator of undernourishment in sheep; a pronounced and immediate increase followed a 40% reduction in ration. FFA and ketone levels increased during 7 days of fasting, the former markedly and to a degree depending on blood glucose level; there was a close inverse correlation between plasma FFA and blood glucose levels. Similar correlations were recorded in undernourished pregnant and lactating ewes, although FFA values were consistently higher in lactation at all blood glucose levels. Ketone levels were linearly related to FFA levels when blood glucose values exceeded 25–30 mg %. Below this level of glucose there was no further increase in FFA, but ketones increased markedly. Caloric homeostasis is relatively easily maintained in undernourished nonpregnant and lactating sheep. The undernourished pregnant ewe is susceptible to hypoglycaemia, and it is suggested that there is a critical blood glucose level of 25–30 mg % below which caloric homeostasis becomes more difficult to maintain, because of endocrine changes which markedly affect the normal pattern of fat metabolism.

Free fatty acid receptor 1 agonist, MR1704, lowers blood glucose levels in rats unresponsive to the sulfonylurea, glibenclamide

2017 ◽  
Vol 79 (1) ◽  
pp. 16-21
Author(s):  
Naoto Tsuda ◽  
Atsuko Kawaji ◽  
Mitsuhiro Takagi ◽  
Chika Higashi ◽  
Masaki Nakamura ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Blood Glucose ◽  
Free Fatty Acid ◽  
Acid Receptor ◽  
Glucose Levels ◽  
Blood Glucose Levels ◽  
Free Fatty Acid Receptor ◽  
Fatty Acid Receptor

Free fatty acid turnover and oxygen consumption. Effects of noradrenaline in nonfasted and nonanesthetized cold-adapted rats

1980 ◽  
Vol 58 (7) ◽  
pp. 797-804 ◽  
Author(s):  
Louise Lafrance ◽  
Georges Lagacé ◽  
Danièle Routhier
Keyword(s):  
Fatty Acids ◽  
Oxygen Consumption ◽  
Fatty Acid ◽  
Lipid Metabolism ◽  
Blood Glucose ◽  
Free Fatty Acid ◽  
Free Fatty Acids ◽  
Respiratory Quotient ◽  
Cold Adapted ◽  
Plasma Ffa

The effects of a 3-h noradrenaline (NA) infusion (1.5 μg kg−1 min−1) on the O2 consumption, the respiratory quotient (RQ), the concentration of plasma free fatty acids (FFA), and the rates of appearance (Ra) and disappearance (Rd) of plasma FFA were studied in nonfasted and nonanesthetized control and cold-adapted rats. To calculate the Ra FFA and Rd FFA, [1-14C]palmitate complexed to albumin was infused as a tracer. The concentrations of glucose and lactate in blood were also determined before and during the NA infusion. The enhanced O2 consumption produced by NA in cold-adapted rats was associated with a decreased RQ. The Ra FFA and Rd FFA were more enhanced by NA in cold-adapted than in control rats whereas the plasma FFA concentration was less elevated in cold-adapted rats. The blood lactate was barely increased by the NA infusion in cold-adapted rats and was not modified in control rats. Blood glucose was increased by NA in both control and cold-adapted rats but to a greater extent in control rats during the last 90 min of NA infusion. These results suggest that the enhanced calorigenic response to NA observed in nonfasted and nonanesthetized cold-adapted rats is related, at least partly, to an enhanced lipid metabolism; the RQ is low and Ra FFA and Rd FFA are greatly increased. However, the contribution of other energetic substrates like glucose will also be investigated in further studies.

The Effects of Cold and Prostaglandin E1 on Lipid Mobilization in the Chicken

1971 ◽  
Vol 49 (5) ◽  
pp. 394-398 ◽  
Author(s):  
W. D. Wagner ◽  
R. A. Peterson ◽  
R. J. Cenedella
Keyword(s):  
Fatty Acid ◽  
Free Fatty Acid ◽  
Cold Exposure ◽  
Prostaglandin E1 ◽  
Plasma Free Fatty Acid ◽  
Prostaglandin E ◽  
Elevated Plasma ◽  
Lower Plasma ◽  
Lipid Mobilization ◽  
Plasma Ffa

Plasma free fatty acid (FFA) levels and the effects of prostaglandin E1 (PGE1) were studied in cold-acclimated and cold-exposed chickens and compared to controls. Chickens cold-acclimated at 4–7 or 8–11 °C for 4 weeks had significantly elevated plasma FFA when compared to the controls at 19–21 °C. Although PGE1 had no effect on the basal level of FFA of controls, a significantly lower plasma FFA was seen after injection of either 10 or 30 μg PGE1/kg in cold-acclimated chickens. Chickens cold-exposed to 2–3 °C for 4 h demonstrated significant elevations of plasma FFA when compared to controls. Only 30 μg PGE1/kg significantly depressed the plasma FFA in the cold-exposed birds. No inhibition of basal FFA release was seen in control animals. From these experiments, it is concluded that chickens mobilize FFA extensively under cold-exposure and that this stimulated lipolysis is inhibited by PGE1.

Dose-dependent effect of insulin on plasma free fatty acid turnover and oxidation in humans

1990 ◽  
Vol 259 (5) ◽  
pp. E736-E750 ◽  
Author(s):  
R. C. Bonadonna ◽  
L. C. Groop ◽  
K. Zych ◽  
M. Shank ◽  
R. A. DeFronzo
Keyword(s):  
Fatty Acid ◽  
Free Fatty Acid ◽  
Lipid Oxidation ◽  
Plasma Insulin ◽  
Plasma Free Fatty Acid ◽  
Whole Body ◽  
Glucose Disposal ◽  
Body Lipid ◽  
Plasma Ffa ◽  
Dose Dependent

Methodology for measuring plasma free fatty acid (FFA) turnover/oxidation with [1–14C]palmitate was tested in normal subjects. In study 1, two different approaches (720-min tracer infusion without prime vs. 150-min infusion with NaH14CO3 prime) to achieve steady-state conditions of 14CO2 yielded equivalent rates of plasma FFA turnover/oxidation. In study 2, during staircase NaH14CO3 infusion, calculated rates of 14CO2 appearance agreed closely with NaH14CO3 infusion rates. In study 3, 300-min euglycemic insulin clamp documented that full biological effect of insulin on plasma FFA turnover/oxidation was established within 60–120 min. In study 4, plasma insulin concentration was raised to 14 +/- 2, 23 +/- 2, 38 +/- 2, 72 +/- 5, and 215 +/- 10 microU/ml. A dose-dependent insulin suppression of plasma FFA turnover/oxidation was observed. Plasma FFA concentration correlated positively with plasma FFA turnover/oxidation in basal and insulinized states. Total lipid oxidation (indirect calorimetry) was significantly higher than plasma FFA oxidation in the basal state, suggesting that intracellular lipid stores contributed to whole body lipid oxidation. Hepatic glucose production and total glucose disposal showed the expected dose-dependent suppression and stimulation, respectively, by insulin. In conclusion, insulin regulation of plasma FFA turnover/oxidation is maximally manifest at low physiological plasma insulin concentrations, and in the basal state a significant contribution to whole body lipid oxidation originates from lipid pool(s) that are different from plasma FFA.

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