PLASMA INSULIN AND GROWTH HORMONE CONCENTRATIONS IN PREGNANT SHEEP I:

1976 ◽  
Vol 82 (2) ◽  
pp. 544-552 ◽  
Author(s):  
Knut Hove ◽  
Anne Kristine Blom
Keyword(s):  
Growth Hormone ◽  
Plasma Insulin ◽  
Late Pregnancy ◽  
Plasma Growth Hormone ◽  
Energy Substrate ◽  
Insulin Levels ◽  
Pregnant Sheep ◽  
Plasma Insulin Levels ◽  
Insulin Responses ◽  
Substrate Concentrations

ABSTRACT Two or three foetal lambs regularly result in a varying degree of carbohydrate shortage in mother ewes in late pregnancy. We have investigated the correlation between plasma insulin, growth hormone and energy substrate concentrations in ewes 8 and 1 weeks before lambing. Plasma growth hormone was fairly constant (2–3 ng/ml) throughout the 24-h cycle 8 weeks before parturition. Seven weeks later higher average levels and increased diurnal fluctuations were observed in 3 out of 4 multiparous ewes. The average post-absorptive insulin levels were reduced by 50 per cent during the same interval. Simultaneously decreased post-absorptive sugar and increased acetoacetate levels were observed. It is concluded that the hormonal adaptations to the increasing carbohydrate deficit in late pregnancy, especially among multiparous ewes, include: a) reduced post-absorptive plasma insulin levels, b) reduced insulin responses to feeding, and c) increased levels of growth hormone in the plasma.

scholarly journals Post-prandial decrease in plasma growth hormone levels is not related to the increase in plasma insulin levels in goats

2017 ◽  
Vol 30 (12) ◽  
pp. 1696-1701
Author(s):  
Koki Nishihara ◽  
Ryoko Kobayashi ◽  
Yutaka Suzuki ◽  
Katsuyoshi Sato ◽  
Kazuo Katoh ◽  
...  
Keyword(s):  
Growth Hormone ◽  
Plasma Insulin ◽  
Plasma Growth Hormone ◽  
Hormone Levels ◽  
Insulin Levels ◽  
Plasma Insulin Levels

PLASMA INSULIN AND GROWTH HORMONE CONCENTRATIONS IN PREGNANT SHEEP II:

1976 ◽  
Vol 82 (2) ◽  
pp. 553-560 ◽  
Author(s):  
Anne Kristine Blom ◽  
Knut Hove ◽  
Jon J. Nedkvitne
Keyword(s):  
Growth Hormone ◽  
Plasma Insulin ◽  
Late Pregnancy ◽  
Plasma Free Fatty Acid ◽  
Maternal Metabolism ◽  
Pregnant Sheep ◽  
Significant Difference ◽  
Pregnant Ewe ◽  
Plasma Gh ◽  
Maintenance Ration

ABSTRACT The pregnant ewe compensates the reduced carbohydrate availability in late pregnancy by increased fat combustion. The purpose of the present study was to examine the adaptation of plasma growth hormone (GH) and insulin levels to this change in energy substrate metabolism. Two groups of ewes were bled in the post-absorptive state at different stages of pregnancy. One group (7 animals) was fed adequately throughout pregnancy, while the other received a maintenance ration for non-pregnant sheep (28 animals). Plasma GH increased from averages from 2–3 to 8–14 ng/ml during the last month before lambing. Shearing of the wool combined with a cold stress resulted in a clearly detectable peak in plasma GH in the underfed sheep. No significant difference in plasma GH attributable to differences in diet could be detected in late pregnancy. Plasma insulin decreased steadily the last 5 weeks towards lambing, most in mothers with 3 lambs. Plasma free fatty acid levels (FFA) increased the last 2 months of pregnancy, most in the underfed sheep. GH and FFA were positively correlated (r = 0.50 and 0.30 in the two groups). It is concluded that the adaptation of the maternal metabolism to reduced carbohydrate - and eventually energy-availability in late pregnancy included lowering of insulin and enhancement of plasma GH levels. These adaptations were detectable under the present conditions the last 5–6 weeks before term.

The Effects of Electroconvulsive Therapy on Plasma Insulin and Glucose in Depression

1992 ◽  
Vol 161 (1) ◽  
pp. 94-98 ◽  
Author(s):  
Karen Williams ◽  
Jeanette Smith ◽  
Paul Glue ◽  
David Nutt
Keyword(s):  
Blood Glucose ◽  
Clinical Outcome ◽  
Electroconvulsive Therapy ◽  
Plasma Insulin ◽  
Insulin Response ◽  
Significant Rise ◽  
Insulin Levels ◽  
Depressed Patients ◽  
Plasma Insulin Levels ◽  
Insulin Responses

The effects of ECT on plasma insulin and glucose were assessed in 20 depressed patients, during the first, third and fifth session of ECT. After each administration of ECT there was a significant rise in blood glucose and plasma insulin levels, both of which peaked at 15 minutes. Insulin responses tended to attenuate over the course of ECT, whereas the glucose responses were similar for all three treatments. ECT was effective in all patients, although two months after the last treatment nine patients had partially relapsed (Hamilton score > 15). Those who relapsed had a more attenuated insulin response at the fifth treatment than those who had remained well, which suggests that insulin response to ECT may be predictive of clinical outcome.

Insulin-independent glucose uptake in growth hormone treated dairy cows

1998 ◽  
Vol 65 (3) ◽  
pp. 423-431 ◽  
Author(s):  
MICHAEL T. ROSE ◽  
FUMIAKI ITOH ◽  
MITSUTO MATSUMOTO ◽  
YUJI TAKAHASHI ◽  
YOSHIAKI OBARA
Keyword(s):  
Growth Hormone ◽  
Dairy Cows ◽  
Glucose Uptake ◽  
Plasma Insulin ◽  
Whole Body ◽  
Glucose Disposal ◽  
Glucose Turnover ◽  
Insulin Levels ◽  
Elevated Glucose ◽  
Plasma Insulin Levels

Our aim was to determine the effect of growth hormone on non-insulin-mediated glucose disposal in lactating dairy cows. Following 5 d of subcutaneous injections of either saline or growth hormone, insulin, somatostatin or insulin plus somatostatin were infused for 2 h each, in a series of experiments. Coincident with this, unlabelled glucose was infused at a variable rate to maintain a constant plasma glucose concentration. Glucose, doubly labelled with deuterium, was also infused for the calculations of glucose turnover. Plasma insulin levels were reduced to nearly zero by the infusion of somatostatin; under such conditions whole body glucose disposal should be non-insulin-mediated. Dairy cows treated with growth hormone, which had significantly increased milk yields on the day before the experimental infusions, did not have different levels of whole body non-insulin-mediated glucose disposal when expressed in absolute terms. Growth hormone did not affect non-mammary non-insulin-mediated glucose uptake estimated by calculation. Growth hormone significantly inhibited insulin-mediated glucose uptake when plasma insulin levels were elevated. Glucose uptake during insulin plus somatostatin infusion was not significantly different from that of the insulin only infusion.

scholarly journals Lower plasma insulin levels during overnight closed-loop in school children with type 1 diabetes: Potential advantage? A randomized cross-over trial

PLoS ONE ◽  
2019 ◽  
Vol 14 (3) ◽  
pp. e0212013 ◽  
Author(s):  
Ulrike Schierloh ◽  
Malgorzata E. Wilinska ◽  
Ineke M. Pit-ten Cate ◽  
Petra Baumann ◽  
Roman Hovorka ◽  
...  
Keyword(s):  
Type 1 Diabetes ◽  
School Children ◽  
Plasma Insulin ◽  
Closed Loop ◽  
Lower Plasma ◽  
Insulin Levels ◽  
Plasma Insulin Levels

Metformin decreases plasma insulin levels and systolic blood pressure in spontaneously hypertensive rats

1994 ◽  
Vol 267 (4) ◽  
pp. H1250-H1253 ◽  
Author(s):  
S. Verma ◽  
S. Bhanot ◽  
J. H. McNeill
Keyword(s):  
Blood Pressure ◽  
Systolic Blood Pressure ◽  
Spontaneously Hypertensive Rats ◽  
Plasma Insulin ◽  
Metformin Treatment ◽  
Hypertensive Rats ◽  
Spontaneously Hypertensive ◽  
Insulin Levels ◽  
Plasma Insulin Levels ◽  
Wistar Kyoto

To determine the relationship between hyperinsulinemia and hypertension in spontaneously hypertensive rats (SHR), the antihyperglycemic agent metformin was administered to SHR and their Wistar-Kyoto (WKY) controls, and its effects on plasma insulin levels and blood pressure were examined. Five-week-old rats were started on oral metformin treatment (350 mg.kg-1.day-1, which was gradually increased to 500 mg.kg-1.day-1 over a 2-wk period). Metformin treatment caused sustained decreases in plasma insulin levels in the SHR (27.1 +/- 2.3 vs. untreated SHR 53.5 +/- 2.7 microU/ml, P < 0.001) without having any effect in the WKY (30.7 +/- 2.2 vs. untreated WKY 37.8 +/- 1.6 microU/ml, P > 0.05). The treatment did not affect the plasma glucose levels in any group. Metformin treatment also attenuated the increase in systolic blood pressure in the SHR (157 +/- 6.0 vs. untreated SHR 196 +/- 9.0 mmHg, P < 0.001) but had no effect in the WKY (134 +/- 3 vs. untreated WKY 136 +/- 4 mmHg, P > 0.05). Furthermore, raising plasma insulin levels in the metformin-treated SHR to levels that existed in the untreated SHR reversed the effect of metformin on blood pressure (189 +/- 3 vs. untreated SHR 208 +/- 5.0 mmHg, P > 0.05). These findings suggest that either hyperinsulinemia may contribute toward the increase in blood pressure in the SHR or that the underlying mechanism is closely associated with the expression of both these disorders.

GLUCOSE DISAPPEARANCE RATE IN SYMPTOMATIC NEONATAL HYPOGLYCEMIA

PEDIATRICS ◽  
1973 ◽  
Vol 52 (1) ◽  
pp. 75-82
Author(s):  
Rosita S. Pildes ◽  
Daksha A. Patel ◽  
Menachem Nitzan
Keyword(s):  
Growth Hormone ◽  
Plasma Insulin ◽  
Newborn Infants ◽  
Glucose Disposal ◽  
Disappearance Rate ◽  
Neonatal Hypoglycemia ◽  
Plasma Growth Hormone ◽  
Intravenous Glucose ◽  
Glucose Disappearance

The present study was undertaken to determine the rate of glucose disposal in the pathogenesis of symptomatic neonatal hypoglycemia. Intravenous glucose (1 gm/kg) was injected rapidly into 11 hypoglycemic and eight control newborn infants. The percentage (mean ± SEM) disappearance rate per minute (Kt) was significantly higher (p &lt; 0.001) in the hypoglycemic newborn infants compared with that of the controls (2.8 ± 0.1 versus 1.2 ± 0.1, respectively). Baseline plasma insulin concentrations were significantly higher (p &lt; 0.01) in the hypoglycemic (16.8 ± 3.9µU/ml) than those of the controls (3.5 ± 1.0µU/ml). Baseline plasma growth hormone values in the hypoglycemic newborns were 16.6 ± 5.7 mµg/ml. Growth hormorne values rose in the hypoglycemic to 36 ± 10 mµg/ml at 10 minutes and to 64 ± 13 mµg/ml by 60 minutes.

Interactions of cold exposure and starvation on glucose tolerance and insulin response

1983 ◽  
Vol 245 (6) ◽  
pp. E575-E581 ◽  
Author(s):  
A. L. Vallerand ◽  
J. Lupien ◽  
L. J. Bukowiecki
Keyword(s):  
Glucose Tolerance ◽  
Cold Acclimation ◽  
Cold Exposure ◽  
Plasma Insulin ◽  
Insulin Response ◽  
Insulinogenic Index ◽  
Intravenous Glucose ◽  
Peripheral Tissues ◽  
Insulin Levels ◽  
Plasma Insulin Levels

The metabolic interactions of cold exposure, cold acclimation, and starvation on glucose tolerance and plasma insulin levels were studied in precannulated, unrestrained, and unanesthetized rats. Cold exposure (48 h at 5 degrees C) significantly reduced the insulin response to intravenous glucose injection (P less than 0.01) while improving glucose tolerance (P less than 0.01). Starvation (48 h at 25 degrees C) also reduced the insulin response (P less than 0.01) but did not significantly alter glucose tolerance. “Accelerated starvation” induced by starving rats for 48 h at 5 degrees C dramatically reduced both basal and glucose-stimulated insulin levels while even improving glucose tolerance, resulting in a 15-fold reduction in the insulinogenic index. Cold acclimation (3 wk at 5 degrees C) induced essentially the same alterations as cold exposure. Approximately reversed changes were observed when cold-acclimated rats were returned to a warm environment for 15–18 h. Results from these studies indicate that 1) cold exposure and starvation, but not cold acclimation, act synergistically in decreasing the sensitivity and/or the capacity of pancreatic islets for secreting insulin in response to glucose stimulation; 2) glucose tolerance and possibly insulin sensitivity of peripheral tissues are enhanced by cold exposure and starvation, although glucose tolerance is improved by cold exposure only, not by starvation; 3) an improved glucose tolerance with barely detectable plasma insulin levels was obtained in cold-starved rats under normal physiological conditions.

ANF inhibits glucose-stimulated insulin secretion in mouse and rat

1988 ◽  
Vol 255 (5) ◽  
pp. E579-E582 ◽  
Author(s):  
B. Ahren
Keyword(s):  
Insulin Secretion ◽  
Atrial Natriuretic Factor ◽  
Plasma Insulin ◽  
Glucagon Secretion ◽  
Insulin Levels ◽  
Atrial Cells ◽  
Insulin And Glucagon Secretion ◽  
Plasma Insulin Levels ◽  
Glucose Stimulated Insulin Secretion ◽  
Dose Levels

Atrial natriuretic factor (ANF) is synthesized in atrial cells and was recently demonstrated to also occur within islet glucagon cells. Therefore, we investigated the possible effects of synthetic rat ANF-(1-28) on basal and stimulated insulin and glucagon secretion in the mouse and on glucose-induced insulin secretion in the rat. We found that ANF did not affect basal levels of insulin, glucagon, or glucose when injected intravenously at dose levels between 0.25 and 4.0 nmol/kg in mice. However, when injected together with glucose (2.8 mmol/kg), ANF (4.0 nmol/kg) inhibited the increase in plasma insulin levels by 40%, from 114 +/- 8 microU/ml in controls to 81 +/- 8 microU/ml (P less than 0.01). Likewise, the increase in plasma insulin levels during an intravenous infusion of glucose in rats (10 mg/min) was significantly reduced by ANF (100 pmol.kg-1.min-1; P less than 0.001). In contrast, the increase in plasma levels of insulin and glucagon after the intravenous injection of the cholinergic agonist carbachol in mice (0.16 mumol/kg) was not significantly affected by ANF. We conclude that ANF inhibits glucose-stimulated insulin secretion in the mouse and the rat. The peptide may therefore be a modulator of insulin secretion.

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