Glucagon-cortisol interactions on glucose turnover and lactate gluconeogenesis in normal humans.
Glucagon-cortisol interactions on glucose turnover and lactate gluconeogenesis in normal humans.
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胰高血糖素-皮质醇相互作用对正常人葡萄糖周转和乳酸糖异生的影响。
DOI:
10.1152/ajpendo.1990.258.4.e569
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发表时间:
1990
期刊:
影响因子:
--
通讯作者:
Gerich,J
中科院分区:
文献类型:
--
作者:
Lecavalier,L;Bolli,G;Gerich,J
To determine the mechanism for cortisol enhancement of glucagon-stimulated overall hepatic glucose output (OHGO), we employed the glucose-insulin clamp technique with infusions of [6-3H]glucose and [U-14C]lactate and measured OHGO, glucose utilization, and the turnover and incorporation of lactate in plasma glucose in normal volunteers under four experimental conditions: 1) normoglucagonemia (approximately 150 pg/ml)- normocortisolemia (approximately 14 micrograms/dl); 2) isolated hyperglucagonemia (approximately 550 pg/ml); 3) isolated hypercortisolemia (approximately 32 micrograms/dl); and 4) combined hyperglucagonemia-hypercortisolemia. Isolated hyperglucagonemia caused initial increases in OHGO and lactate gluconeogenesis, which were maximal at 1 h (23.9 +/- 1 and 2.7 +/- 0.4 mumol.kg-1.min-1, respectively) but remained significantly above values in control experiments through 5 h (10.3 +/- 0.7 vs. 8.2 +/- 1.1, P less than 0.03; 2.2 +/- 0.4 vs. 1.2 +/- 0.3, mumol.kg-1.min-1, P less than 0.04, respectively). Hypercortisolemia has no effect on OHGO but increased lactate gluconeogenesis after 3 h. Superimposition of hypercortisolemia on hyperglucagonemia did not further increase OHGO (11.1 +/- 0.7 vs. 10.3 +/- 0.7 mumol.kg-1.min-1, P = NS) but augmented lactate gluconeogenesis additively (isolated hyperglucagonemia = 0.96, isolated hypercortisolemia = 0.98; combined = 2.02 mumol.kg-1.min-1). Neither glucagon nor cortisol affected lactate turnover or glucose utilization. We conclude that glucagon has a persistent effect on OHGO largely accounted for by increased gluconeogenesis. Cortisol augments glucagon-stimulated gluconeogenesis in an additive manner best explained by changes in gluconeogenic enzymes rather than in substrate availability. Finally, the fact that cortisol increased gluconeogenesis without affecting glucose utilization suggests that the liver is more sensitive to the diabetogenic effects of cortisol than are peripheral tissues.
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影响因子:
15.9
作者:
N. Eigler;L. Saccá;R. Sherwin
通讯作者:
R. Sherwin
影响因子:
7.7
作者:
P. Felig;J. Wahren;R. Sherwin;R. Hendler
通讯作者:
R. Hendler
DOI:
10.1172/jci108523
发表时间:
1976
期刊:
The Journal of clinical investigation
影响因子:
--
作者:
P. Felig;J. Wahren;R. Hendler
通讯作者:
R. Hendler
影响因子:
5.8
作者:
L. Saccá;R. Hendler;R. Sherwin
通讯作者:
R. Sherwin
DOI:
10.1210/jcem-48-1-171
发表时间:
1979
期刊:
The Journal of clinical endocrinology and metabolism
影响因子:
--
作者:
J. Liljenquist;G. Mueller;A. Cherrington;J. Perry;D. Rabinowitz
通讯作者:
D. Rabinowitz